BATC Wiki - User contributions [en-gb]

Treasurer Role

2026-07-27T13:19:34Z

G8GKQ: Created page with "The role of the treasurer is to oversee and perform the tasks required for the financial administration of the club in compliance with the club’s constitution. '''The main..."

The role of the treasurer is to oversee and perform the tasks required for the financial administration of the club in compliance with the club’s constitution.

'''The main responsibilities and duties of the treasurer include:'''

Acting as the primary account holder for the club’s bank, trading and savings accounts (currently the Lloyds current account, a PayPal account and a Teachers Building Society account).

Recording and payment of authorised bills, invoices and reimbursement claims.

Tracking the current account balance and transferring funds between the club’s accounts as required.

Keeping ongoing financial records and preparing accounts for examination annually.

Monitoring and resolving financial disputes in the trading account.

Advising the shop manager on shop pricing policy

Reporting on the state of the club’s finances at Committee and general meetings, and when requested by the Chairman or Secretary.

Advising the committee on financial decisions, especially where they might risk the club’s ability to meet its liabilities to creditors or members.

BATC Wiki

2026-07-27T13:18:54Z

G8GKQ: /* BATC Organisation */

'''Welcome to the British Amateur Television Club Wiki''' - the place to find information on all Amateur Television related equipment and projects. For details on how to join the BATC, the member's shop and CQ-TV archive and download visit the BATC website https://batc.org.uk/

This is your site, developed by the BATC for use by the worldwide ATV community - any information which you feel is of use to others can be put on the Wiki but editing accounts are only available to trusted members. Please get in touch with any member of the BATC Committee if you have something of interest to post. Please do not request an account before contacting a member of the BATC Committee; requests without pre-approval are ignored.

* New to Amateur TV - Get the basics on our [[Getting Started|Getting Started page]]

* For details on the Portsdown DATV transmit and receive system go to [[The Portsdown DATV transceiver system|the Portsdown pages]]

* For information on the MiniTiouner USB DATV receiver go to [[MiniTioune|MiniTiouner]]

* For the DATV equipment capability list go to [[DATV equipment capability|https://wiki.batc.org.uk/DATV_equipment_capability]]

== Contents ==
* [[Registering]] on the BATC wiki

== New to Amateur TV? ==
* Get the basics on our [[Getting Started|Getting Started page]]

==BATC Information and services==
* [[Joining the BATC]]

* [[Renewing your membership]]

* The [[BATC Privacy statement and data protection policy]]

* The [[BATC forum]]

* The [[BATC shop]]

* The [[The_new_streamer|BATC streamer]]

* The [[BATC archive]] Collection of photos and documents from BATC's past

* The [[new BATC website|BATC website]]

== BATC projects ==
* [[The Portsdown Transmitter]] - the BATC's Raspberry Pi-based DATV Transmitter
* [[MiniTioune]] - the DATV DVB-S / S2 receiver project
* [[Ryde Receiver]] - Dedicated DATV set top box project
* [[Knucker]] - Variable bandwidth DVB-T project
* [[Advanced receiver hardware]] - Details of the BATC advanced receiver hardware.
* [[WinterHill Receiver Project]] - Multi-channel DVB-S / S2 project
* [[BATC Video Source]] - The Raspberry Pi-based composite video source described in CQ-TV 270
* [[BATC HDMI Source]] - The Raspberry Pi-based HDMI video source to be described in CQ-TV 280
* [[Digilite]] - The original home build DATV construction project
* [[Repeater Controller]] - The BATC ATV Repeater Controller using a Raspberry Pi 4
* [[ARISS Digital Communication System]]
* [[PicoTuner]] - A USB tuner for DATV using the RpiPico as the USB interface
* [[Lynx RPi5 Dual RX]] - Lynx dual-channel Pi5 DATV Receiver project with Magic Eye tuning indicator and web console

== CQ-TV Magazine ==
* [[Index of articles]]
* [[Archive edition|Archive editions]] download
* [[BATC_Software_Library]] for project downloads

==BATC Event Streaming Equipment==
* [[Equipment Description]]

== BATC Conventions ==

Presentations from previous conventions can be found on this page [[BATC Conventions]]

==National and International Events==

* [[ HAM RADIO 2018 ]] ATV Presentations from HAM RADIO 2018 at Friedrichhsafen.

* [[ HAM RADIO 2019 ]] ATV Presentations from HAM RADIO 2019 at Friedrichshafen.

* [[ HAM RADIO 2022 ]] ATV Presentations from HAM RADIO 2022 at Friedrichshafen.

* [[ RSGB Convention 2022 ]] ATV Presentation at the 2022 RSGB Convention 2022

* [[ HAM RADIO 2023 ]] ATV Presentations from HAM RADIO 2023 at Friedrichshafen.

* [[ EMFcamp 2024 ]] BATC / AMSAT-UK / UKuG demonstration village at EMFcamp 2024.

* [[ HAM RADIO 2024 ]] ATV Presentations from HAM RADIO 2024 at Friedrichshafen.

* [[ HAM RADIO 2025 ]] ATV Presentations from HAM RADIO 2025 at Friedrichshafen.

==HAMTV on the ISS==

[[HAMTV from the ISS|HAMTV - 2.4GHz Digital Amateur Television (DATV) on the International Space Station (ISS)]]

== Getting on the air with ATV ==
===The ATV bands===
* [[29 MHz]]
* [[51 MHz]]
* [[71 MHz]]
* [[146 MHz RB-TV]]
* [[70cms Analogue TV]]
* [[70cm DATV]]
* [[23cms ATV]]
* [[13cms]]
* [[3.4 GHz DATV]]
* [[5.6 GHz]]
* [[10 GHz]]
* [[:Media:ATV on 5.6 10 and 24 Ghz.pdf|April 2018 Presentation to MMRT about ATV on 5.6 10 and 24 GHz]]

===The different ATV modes===
* [[Reduced bandwidth TV]] (RB-TV)
* [[The Effect of FEC]]

===Equipment Options===
* [[DATV transmitting Equipment]]

==Advanced encoding / input options==

Details of advanced transmission configurations, primarily for H265,and video production software.

* [[Feeding Video to Portsdown from vMix|Vmix output in to Portsdown IPTS input]]
* [[OBS - Open Broadcast Studio|OBS output in to Portsdown IPTS input]]
* [[Using GTX10xx Graphics card encoder with OBS]]
* [[Custom_DATV_Firmware_for_the_Pluto|Using the Pluto for DATV]]
* [[Jetson_Nano|Using the Jetson Nano with Portsdown]]

== Operating ==
* [[DATV equipment capability]] - Wiki page documenting the capabilities of common DATV transmit and receive equipment.
* [[ATV standards]] - a list of standards used by ATV operators including FM bandwidths, DATV PIDs, symbol rates and FEC
* [[EMF Compliance]] - information about EMF compliance for ATV and Microwave Operation
* [[Directory of portable sites]] suitable for ATV and microwave operation
* [https://www.google.com/maps/d/u/0/edit?mid=1VeLnRRbLwloDTL2i9-HE2sxqL0c&ll=52.95536632179757%2C-0.49709419999999227&z=7 Google map] showing possible portable operating sites
* [[Mapping tools]] including finding the QRA locator of a site, UK postcode to Lat and Long conversion and a topographic overlay for Google maps
* [[Propagation tools]]
* [[UK ATV DX Records]] - a list of Known DX Records for the UK
* [[2026 Activity Weekends]]
* [[2026 Activity Ladders]]
* [[Christmas 2025 Repeater Contest & Activity Ladder|Christmas 2025 repeater Contest & Activity Ladder]]
* [[IARU ATV contest]] - How to enter the annual international TV contest
* [[IARU Region 1 ATV Contest 2025 International Results]] - International Results for the June 2025 IARU Contest

==ATV repeaters==
* [[ATV Repeater Map]]
* [[UK ATV repeaters]]
* [[USA ATV repeaters]]
* [[Australian TV repeaters]]

* [[Technical topics for ATV repeater builders]]

==Es'hail-2==
* [[Es'hail-2 Basic Information|Getting started, LNBs and aligning a dish]]

* [[Es'hail-2 Ground Station|Es'hail-2 BATC WebSDR & DATV Spectrum Monitor]]

* [[Es'hail-2 DATV Bandplan]]

* [[Es'hail-2_LNBs_and_Antennaes|Es'hail-2_LNBs]]

* [[Transmitting_Oscar_100_DATV_signals|Es'hail-2 Transmitters]]

* [[Es'hail-2 Antennaes]]

* [[Es'hail-2 conference transmissions]]

==ATV projects==
* [[Adalm Pluto]] - Collection of information on using the Adalm Pluto for DATV
* [[The MacGuffin Project]] - Collection of tools used to create an automated multi-band ATV system
* [[Receiver upconverters]] - Details of upconverters to receive 146 and 437 MHz on STB and MiniTioune
* [[Jetson Nano]] - Third generation computer-based DATV Transmitter
* [[DTX1 TS]] - interface board to take in TS streams to the DTX1
* [[RpiDATV]] - software for the Rpi
* [[RBTVMOD]] - variable rate RB-TV mdulator for the Rpi
* [[DATVExpress]] - SDR hardware based DATV transmitter covering 70 - 2450 MHz
* [[PE43703 2025]] - PE43703 variable attenuator project 2025 version
* [[PE4302]] - PE4302 variable attenuator project
* [[ADF435x PIC]] - PIC controllers for Chinese ADF4350/4351 boards
* [[DigiTwist]] - an experimental 2 axis satellite tracker
* [[G4WIM PA controller]] - an advanced PA controller design by G4WIM published in CQ-TV 265
* [[WinterHill Receiver Project]]
* [[Tilt-O-Matic]] Pan and tilt head for surveyor tripods
* [[Gerber Files]] Index of Gerber (PCB) files used by BATC and Members' Projects

== Deutschsprachiges Wiki ==

* Portsdown DATV Projekt - Deutschsprachiges Wiki
* Minitioune(r) - Deutschsprachiges Wiki

== Useful Circuits and notes ==
* [[Antenna changeover relays]] - Notes on suitable antenna change over relays for ATV use.
* [[Filters]] - Collection of links and designs for that most critical but over looked component!
* [[Pre-amps]] - Notes, suppliers and circuits of pre-amplifiers suitable for ATV
* [[Power amplifiers]] - Notes, suppliers and circuits of power amplifiers suitable for ATV
* [[Video circuits]] - Notes and circuits for video processing
* [[Satellite receiver tuning offsets]] - Note on how to set up a satellite receiver to directly receive L band signals.
* [[Using ex-satellite dishes]] - Notes on how to find the feed point of a dish and designs for feeds to use

== ATV Equipment manuals and schematics ==
* [[Bob Platts G8OZP]] Circuits and documentation for the Bob Platts range of equipment
* [[Comtech module]] - 23cms and 13cms ATV Tx and Rx circuits and guides
* [[Solent ATV units]] - Tx and Rx circuits and information
* [[Wood & Douglas FM TV equipment]] - Circuits, pcb layouts and information
* [[LMW Electronics]] - Circuits, pcb layouts and information
* [[Fortop]] - Circuits, pcb layouts and information
* [[Glencom]] - VC-510 VHF to L band up converter circuit diagram and modifications
* [[Global communications]] - Hand drawn circuit of tuneable 70 / 140 MHz to L band block up converter
* [[Jaybeam]] - Details of many Jaybeam aerials

== Ex commercial broadcast equipment manuals ==
* [[NDS System 3000]]
* [[NDS Alteia rx]]

== Test equipment Information ==
For HP and Agilent equipment see the io group discussion at [https://groups.io/g/HP-Agilent-Keysight-equipment]

== Other equipment information related to ATV ==

== BATC Organisation ==

The BATC's Constitution can be found here https://batc.org.uk/club-info/constitution/

The Role of the BATC Treasurer is defined here [[Treasurer Role]]

BATC Wiki

2026-07-27T13:18:40Z

G8GKQ:

Lynx RPi5 Dual RX

2026-07-16T13:33:48Z

G8GKQ: Created page with "The Lynx receiver is a DATV receiver being developed by Justin G8YTZ. As of July 2026 it was in early prototype form and not released. The hardware includes a Raspberry Pi 5..."

The Lynx receiver is a DATV receiver being developed by Justin G8YTZ. As of July 2026 it was in early prototype form and not released.

The hardware includes a Raspberry Pi 5 with display, network connected to a PicoTuner with G4EWJ's ethernet interface.

Features include diversity reception across the tuner's 2 inputs.

2023 - 2028 CQ-TV 281 to CQ-TV 300

2026-07-14T09:04:45Z

G8GKQ:

Copies of CQ-TV more than 2 years old are free to download at the links below and at https://batc.org.uk/cq-tv/cq-tv-archive/

=====Issue 287 Spring 2025=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Needs You
|5
|-
|Muntjac SDR – an Update
|8
|-
|A learning curve with a 70cms pallet
|12
|-
|BATC at HAM RADIO 2025 Friedrichshafen
|13
|-
|The Portsdown Newsletter
|14
|-
|Q1-2025 Dx news from the GB3JV TV Repeater
|14
|-
|Bias-Tee: complicated?
|16
|-
|Aerial experiments for DATV
|19
|-
|A Portable DATV System
|21
|-
|8th March 2025 Activity day
|23
|-
|PE43703 Attenuator Controller
|25
|-
|Building a(nother) rotator for /P usage
|28
|-
|High power PSU with current limiting
|30
|-
|Fun and games with an Arduino
|31
|-
|Product review: Banggood Buck-Boost 120W Power supply
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 286 Winter 2024=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Trevor Lumb home built camera
|7
|-
|The Portsdown Newsletter
|8
|-
|Another solution for effective talkback
|10
|-
|BATC at the Midland Microwave Round Table
|11
|-
|BATC at the RSGB Convention
|12
|-
|SRT - How to get started
|14
|-
|Antenna polarization: why horizontal?
|16
|-
|DATV linear transponder on HB9TV-1 relay
|19
|-
|Conversion of 70cms 350 watt power amplifier pallet
|20
|-
|AllStar DATV Talkback
|21
|-
|BATC Subscriptions
|21
|-
|Digital signal path upgrade of GB3EY
|22
|-
|November Activity Weekend and a 71MHz bandpass filter
|26
|-
|5-petal ‘cloverleaf’ antenna for 435MHz
|27
|-
|A QRO filter for 70cms
|28
|-
|JOTA 2024 - from Gilwell Park GB2GP
|28
|-
|Turning Back the Pages
|29
|-
|CAT25 - Save the date!
|31
|}

=====Issue 285 Autumn 2024=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Jamboree on the Air - 2024
|6
|-
|Adding a RTC (real time clock) to a Portsdown 4
|7
|-
|BATC at the Telford Rally
|8
|-
|Conversion of old pallet amplifier to 13cm
|9
|-
|A look back at BATC history and the work of Mike Cox
|10
|-
|PicoTuneWH - Ethernet software for the BATC PicoTuner
|11
|-
|Muntjac - a Pluto alternative for QO-100 DATV
|12
|-
|The Portsdown Newsletter
|16
|-
|My DATV transmitter
|17
|-
|Mr Whippy moves on…
|19
|-
|CAT 24 – a report of Part one
|20
|-
|Presentation of awards at CAT 24
|23
|-
|Antenna element holders made by a 3D printer
|24
|-
|Adalm Pluto PTT Control
|26
|-
|YASS – Yet another signal source
|27
|-
|Turning Back the Pages
|28
|-
|CAT24 Part II
|31
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv284.pdf Issue 284 Summer 2024]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Agenda for the BATC general meeting
|5
|-
|The Portsdown Newsletter
|6
|-
|CQ-TV back issues
|7
|-
|ATEM Update v9.5
|9
|-
|The LimeNET Micro 2.0 developer edition
|10
|-
|A brief adventure with /MM DATV
|11
|-
|The BATC gets shipshape to help celebrate RNLI 200
|12
|-
|Portsdown 5: under development
|14
|-
|What force to tighten a SMA connector?
|15
|-
|Fitting my PA in a case with a fan
|16
|-
|QO100 from VO1 Newfoundland
|17
|-
|A method for remote off-air status monitoring for DATV repeaters
|20
|-
|Mr Whippy serves up another seven-band Sundae
|23
|-
|My Portable Set-up – Dave, G8GKQ
|25
|-
|Modification of Nokia type PA
|27
|-
|Out and about for a contest…
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv283.pdf Issue 283 Spring 2024]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|HamTV update
|6
|-
|The BATC general meeting 2024
|7
|-
|Financial report
|8
|-
|Introducing the PicoTuner
|10
|-
|A new PCB for the PicoTuner
|11
|-
|BATC shop EU warehouse
|12
|-
|Surface mount Pico adaptor for the MiniTiouner V2 PCB
|12
|-
|Going digital with two triple Ryde receivers
|13
|-
|Cheap video cameras with poor colour reproduction
|16
|-
|The Portsdown Newsletter
|17
|-
|Impact of Amp Over-drive on DATV?
|19
|-
|Portable DATV at GX3WIM/P
|20
|-
|Poor man’s bandviewer
|21
|-
|The Portsdown noise meter
|22
|-
|Modifications to the Polycom VTC Table Microphone
|24
|-
|32dB RF attenuator – an alternative solution
|26
|-
|A quick transition for 3.4GHz, or ‘microwaves in a mustard (O.K, coffee) tin’
|27
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv282.pdf Issue 282 Winter 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Out and about in 2023 with the BATC
|6
|-
|CAT 24 - Initial plans
|8
|-
|David Mann - G8ADM, President of the BATC
|9
|-
|The future of the 23cms band – December 2023
|10
|-
|The Portsdown Newsletter
|11
|-
|New SSTV relay in Chatteris, Cambs
|12
|-
|Serit FTS-4334 NIM / tuner - good news at last
|13
|-
|Switched attenuator for QO-100 transmission
|14
|-
|Evaluation of the quality of transmitted and received analogue video signals
|15
|-
|Mid-Cornwall beacon and repeater group goes green
|19
|-
|BATC represented at “The Day of The Radio Amateur” in the Netherlands
|20
|-
|A multiband multimode transceiver
|22
|-
|Amateur television at the Spennymoor radio rally
|25
|-
|Raspberry Pi 5 - First impressions
|26
|-
|Jamboree on the Air 2023 - a tale of two stations
|27
|-
|Using an external clock with the Pluto Rev C/D
|30
|-
|A quick transition for 3.4GHz, or ‘microwaves in a mustard (O.K, coffee) tin’
|31
|-
|Turning Back the Pages
|32
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv281.pdf Issue 281 Autumn 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IC-905 - Icom’s microwave and ATV transceiver
|8
|-
|You can never have enough computer monitors
|11
|-
|An alternative method of generating FM TV at 5.6GHz
|12
|-
|A New Hybrid Television Transmission Systems
|14
|-
|Out and About…
|19
|-
|Small Dishes
|20
|-
|How to point an antenna if you are out portable?
|21
|-
|CAT 23 – a grand day out
|22
|-
|News from Japan 358 km, 5.7GHz, DATV Success
|24
|-
|Modbus controlling of PAs with Arduino boards
|25
|-
|IARU Region 1 ATV contest 2023 results
|29
|-
|The Charon, a HF up-converter for the Adalm Pluto
|31
|-
|Turning Back the Pages
|32
|}

2013 - 2018 CQ-TV 241 to CQ TV 260

2026-07-14T09:03:18Z

G8GKQ: /* Issue 259 Spring 2018 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv260.pdf Issue 260 Summer 2018]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC 2018 General Meeting
|3
|-
|A potted history of the new BATC website
|10
|-
|DATV on 71 MHz
|12
|-
|71 MHz Transmitter Low Pass Filter
|13
|-
|71 MHz Receive Upconverter
|14
|-
|18W 5GHz band FM-ATV TX
|16
|-
|A piece of Pi
|21
|-
|76GHz tests June 2018
|22
|-
|Video Fundamentals 14
|23
|-
|The BATC Bursary scheme
|26
|-
|Member’s Projects - F1SSF
|26
|-
|HamRadio 2018 Friedrichshafen
|27
|-
|Aligning offset dishes
|28
|-
|The Royal Wedding in High Dynamic Range
|29
|-
|A 3 Watt LDMOS Driver for the 432MHz band
|32
|-
|Portsdown Newsletter
|35
|-
|5.6 GHz ATV – the record DX chase
|37
|-
|Discovering the joys of 5.6GHz ATV
|38
|-
|Roberto Zech, DG0VE, silent key
|40
|-
|Turning Back the Pages - CQ-TV 72
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv259.pdf Issue 259 Spring 2018]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|CAT18 and the BATC General Meeting
|8
|-
|GDPR and the BATC
|12
|-
|The HamTV Merger
|13
|-
|3D Printed horn antennas
|16
|-
|3404MHz Band Pass Filter
|19
|-
|Narrow-bandwidth Television Association
|20
|-
|Video Fundamentals 13 - test signals
|21
|-
|Running 28v Latched Relays from a 12v Rail
|23
|-
|Customising the adf4351 pic code for your frequency
|27
|-
|My Station - M0DTS
|28
|-
|Minitioune V0.8
|30
|-
|Producing a PIC for the 7 – band local oscillator
|33
|-
|Adding a display to the MiniTiouner-V2
|37
|-
|Updates from Germany from TV-AMATEUR 187
|38
|-
|Portsdown 2018
|41
|-
|Member’s Projects - F6GXI
|43
|-
|Touchscreen control of the DATV-Express
|44
|-
|Turning Back the Pages - CQ-TV 71
|45
|}

-----------------------------------------------------------

You can download a copy of the following magazines, which are more than 2 years old, at https://batc.org.uk/cq-tv/cq-tv-archive/ or by clicking on the issue header on this page.

=====[https://batc.org.uk/wp-content/uploads/cq-tv258.pdf Issue 258 Winter 2017]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|5.6Ghz ATV from Cumbria
|11
|-
|9cm LNB Mounting
|14
|-
|GB3FB - A 9cm Digital ATV Repeater
|15
|-
|G3SMU silent key
|21
|-
|BATC report to the RSGB Spectrum Forum
|22
|-
|Kempton Park Rally - 5th November 2017
|23
|-
|A LED power output indicator
|24
|-
|GB3TZ 5.6GHz input
|25
|-
|5.6 GHz WB ATV Tx
|26
|-
|Portsdown Update
|27
|-
|Portsdown Signal Generator
|29
|-
|Using old laptop screens for ATV
|32
|-
|Miniaturised Pulsed Relay Driver for 28V Microwave Relays
|33
|-
|Converting an old Satellite dish to a 23cm dish antenna
|34
|-
|Arthur C. Clarke
|35
|-
|Using the Tarot 5.6GHz ATV Modules
|36
|-
|Turning Back the Pages - CQ-TV 70
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv257.pdf Issue 257 Autumn 2017]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2016
|9
|-
|DigiTwist
|10
|-
|The ADALM-PLUTO low cost SDR
|14
|-
|Silent Keys - G8AJN & G3KTU
|16
|-
|Video Fundamentals 12
|17
|-
|Using a MinimOSD board for On Screen Callsign Display
|19
|-
|Antenna range tests at Finningley for the BATC
|21
|-
|The Portsdown Digital ATV Transmitter A Beginner’s Guide
|22
|-
|The Portsdown Transmitter – Security Aspects
|26
|-
|Notes on Amplifiers & Filters
|27
|-
|A Vintage Pye Camera
|29
|-
|5.6 GHz progress
|30
|-
|CAT17 report
|31
|-
|Repeater Update - October 2017
|33
|-
|The Bang-good 23cm aerial
|34
|-
|The Portsdown Transmitter in pictures
|35
|-
| A Coupler probe for use with the Rigol DSA 815-TG
Spectrum Analyser
|36
|-
|Turning Back the Pages - CQ-TV 69
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv256.pdf Issue 256 Summer 2017]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Portsdown Transmitter Construction Competition
|10
|-
|Power Amplifier for DATV
|11
|-
|DATV Moonbounce from Goonhilly
|12
|-
|The Portsdown Transmitter Software
|15
|-
|8 GHz eBay Power Meter
|17
|-
|CAT 17 – September 9th and 10th 2017
|18
|-
|eBay Ampliiers
|19
|-
|MiniTioune Mark 2 DVB-S digital receiver
|20
|-
|Video Fundamentals 11: Studio systems – the Matrix
|23
|-
|My Station: Malcolm Johnson, G0UHY
|25
|-
|A cheap and easy 6cm ATV transceiver
|26
|-
|Ham Radio: DATV-Forum – the latest trends
|28
|-
|Known Digital ATV DX Records
|29
|-
|BATC website development
|30
|-
|Wideband LNBs
|31
|-
|Turning Back the Pages - CQ-TV 68
|32
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv255.pdf Issue 255 Spring 2017]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|AMSAT North America
Phase 4 Ground Segment Project
|10
|-
|Packaging Digithin
|11
|-
|The Portsdown Project - Overview
|12
|-
|The Portsdown so far…
A users experience of the build
|14
|-
|Portsdown Filter-Modulator Board -
Construction and Testing
|16
|-
|Portsdown Filter-Modulator Board Modifications
|18
|-
|ATV on TV - The day TX Factor came to visit
|20
|-
|G8LES Link Video recorder integration
|22
|-
|Could you help with the Scouts’ JOTA 2017?
|25
|-
|GB3ZZ Experimental Inputs
|26
|-
|BATC website development
|29
|-
|Relocation of the John Lawrence Valve Collection
|30
|-
|Es’hail-2 Ground Segment Planning Meeting
|31
|-
|Video Fundamentals 10: The Mixer
|32
|-
|A high performance ATV upconverter
|34
|-
|Turning Back the Pages - CQ-TV 67
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv254.pdf Issue 254 Winter 2016]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Portsdown DATV project
|11
|-
|The Portsdown Raspberry Pi-based DATV
Transmitter - Introduction
|14
|-
|Constructing the Portsdown Raspberry
Pi-based DATV Transmitter
|16
|-
|Software for the Portsdown Raspberry
Pi-based DATV Transmitter
|18
|-
|HamTV Update
|21
|-
|My Station - Tony Hornby, G1HBD
|22
|-
|BATC report to the RSGB Spectrum Forum
|24
|-
|Video Fundamentals 9 - Genlock and
Reference Signals
|26
|-
|Gilwell 24 - 2016
|28
|-
|Turning Back the Pages - CQ-TV 66
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv253v2.pdf Issue 253 Autumn 2016]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The ADF4351 flexible signal source
|9
|-
|7-band local oscillator
|9
|-
|ADF4351 driven by an Arduino
|13
|-
|GB3HV 70cms input update
|15
|-
|A 437 MHz DVB-S Transmitter
Using a Raspberry Pi
|16
|-
|The Making of ‘TXFactor’
|20
|-
|CAT16 - the full story
|23
|-
|VMix to RpiDATV via FFmpeg
|26
|-
|Noise Power meter for the Minitiouner
|27
|-
|Video Fundamentals 8
|28
|-
|DN1JKG calling OR4ISS
|30
|-
|DATV-Express on Windows
|32
|-
|Here and There...
|34
|-
|New and renewing members
|35
|-
|Turning Back the Pages - CQ-TV 65
|36
|-
|High Tech Wearables
|38
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv252v2.pdf Issue 252 Summer 2016]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Biennial General Meeting – Postal Votes
|6
|-
|CAT 16 Details
|11
|-
|Treasurers Report for 2015
|12
|-
|Dual Filter Board for DigiLite 5.9
|14
|-
|New super tuner design for dvb-s and s2
|17
|-
|HAMPADS: HAM-Portable Affordable Dish
for Satellites
|18
|-
|Summer ATV Contest Images
|23
|-
|Video Fundamentals 7 - Camera Signal Processing
|24
|-
|The Matilda Story
|26
|-
|My Station - Peter Yarde, G8DKC
|35
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv251v2.pdf Issue 251 Spring 2016]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|CAT 16 and BATC AGM
| 9
|-
|Peter Blakeborough, G3PYB - Silent Key
|10
|-
|A BATC Wiki
|12
|-
|The Principia Mission - Give us a wave Tim!
|14
|-
|Social Media
|18
|-
|Simple Antenna Tracker for the ISS
|20
|-
|Animated Test Cards
|22
|-
|My Station - G8VPG **New Feature**
|24
|-
|Activity at GB3ET
|25
|-
|Video Fundamentals 6
|26
|-
|DATV-Express power amplifiers
|28
|-
|Reduced Bandwidth TV Modulator
|32
|-
|New Application for DATV-Express
|34
|-
|More Modifications to the SUP-2400
|35
|-
|leandvb: A lightweight software DVB-S demodulator
|36
|-
|Open Broadcaster Software with DATV-Express
|40
|-
|SUP-2400 DiSEqC update
|45
|-
|Getting started in ATV - DATV reception
|46
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv250-1.pdf Issue 250 Winter 2015]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Latest developments at GB3GV
|6
|-
|BATC report to RSGB Spectrum Forum
|8
|-
|Alan Daw, G1APD - sk
|9
|-
|ARISS and HamTV - Supporting the Principia Mission
|10
|-
|Goonhilly Earth Station
|12
|-
|Variable SR filter for RB-TV
|14
|-
|The HamTV antennas on the ISS
|16
|-
|Using the SUP-2400 for 146.5 MHz Reception
|17
|-
|An outing for the LDK5 camera
|19
|-
|Amateur Television “Getting Started”
|20
|-
|Getting Started with RB-TV
|25
|-
|A bandpass filter for 146.5 MHz
|28
|-
|DiSEqC control for the SUP2400
|29
|-
|Video Fundamentals - Part5
|31
|-
|Simple System to Receive ARISS HamTV
|33
|-
|Using FFmpeg to generate a transport stream
|34
|-
|DATV transmission in the UK – a short history
|40
|-
|Using the Linx 1010b tablet for portable DATV
|44
|-
|GB3HV Christmas Dinner
|46
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv249-1.pdf Issue 249 Autumn 2015]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Outside Broadcast with the BATC
|9
|-
|146MHz RD70HVF1 Amp
|11
|-
|24GHz building blocks
|12
|-
|2 watt driver amplifiers for 1296 and 2304MHz
|15
|-
|HD TV news from Germany
|19
|-
|Slow Scan TV with a Raspberry Pi
|23
|-
|vMix using FFmpeg to create the Transport Stream
|27
|-
|Michael Hastings, G8ASI sk
|32
|-
|CAT 15 - A weekend of technical presentations
|33
|-
|Video Fundamentals - Part4: The Camera’s Eye
|35
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv248-1.pdf Issue 248 Summer 2015]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|RB-TV Roundup
|10
|-
|The Low SR World Conquest
|11
|-
|DATV Developments in North Wales
|16
|-
|Minitiouner - USB Tuner Module
|20
|-
|Narrow band DATV on the BATC DTX1
|25
|-
|Product Review - PE1RKI 23cm four pole filter
|27
|-
|vMix using FFmpeg to create the Transport Stream
|27
|-
|Video Fundamentals - Part 3: Picture Monitor
|29
|-
|Video Sync generator
|31
|-
|A Field Day station with PC6REC
|36
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv247-1.pdf Issue 247 Spring 2015]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|New 70MHz band for RB-DATV
|9
|-
|A Two way on 146.5MHz RB-DATV
|10
|-
|146MHz RD06+RD15 Amp
|12
|-
|New Life for Old Rotators
|13
|-
|A Guide to setting up the DATV Express for
RB-DATV Operation on 146.5MHz
|15
|-
|Portsmouth RB-TV Meeting
|17
|-
|DigiThin - A Narrowband QPSK Modulator for the Raspberry Pi
|19
|-
|DigiThin Beta Testing
|22
|-
|Add-On Transport Stream Dock for BATC DTX1
|23
|-
|RPiDATV software improvements
|25
|-
|GB3KM - the first year of operating on 3.4GHz
|26
|-
|ATV image generator using the Raspberry Pi
|28
|-
|Local oscillators in 1.2GHz band, for Digilite DATV System
|29
|-
|RB-TV receiver developments
|31
|-
|Comparing DATV models
|32
|-
|Video Fundamentals 2 - Colour Bars
|34
|-
|Classic circuits - PicDream
|36
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv246-1.pdf Issue 246 December 2014]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum Oct 14
|11
|-
|Reduced Bandwidth DATV (RB-TV)
|13
|-
|RB-TV Awards Programme
|17
|-
|Antennair DTX-F70 and the Antennair DTX-F23
|18
|-
|Understanding DATV RF Bandwidth for DVB-S
|20
|-
|IARU Region 1 General Conference Report
|23
|-
|Video Fundamentals 1 – The Line Sync Pulse
|25
|-
|BATC Streaming Service
|26
|-
|RPiDATV RB-TV transmit system
|28
|-
|BATC New subscription rates
|33
|-
|MAX On-Screen-Display Generator
|34
|-
|Classic circuits – General Purpose Amplifier
|36
|-
|Digital-ATV - Using ODROID with the DATV-Express board
|37
|-
|GoPro Hero 4
|42
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv245-1.pdf Issue 245 September 2014]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|CAT14 - in words and pictures
|8
|-
|DVB-S on the Solent - Part 1
|10
|-
|The Marconi at CAT14
|11
|-
|Effect of Phase Noise on a DVB-S Signal
|14
|-
|DVB-S on the Solent - Part 2
|15
|-
|Weak Signal Performance of DVB-S Receivers
|17
|-
|Geostationary ATV could be on its way!
|19
|-
|Museo de la Imagen - Santiago de Cuba, Cuba
|20
|-
|Annual Worldwide ATV QSO Party
|23
|-
|DVB-T with a Hides HV110
|30
|-
|IARU Region 1 Conference
|31
|-
|A Filter for 437MHz
|32
|-
|Classic Circuits - a Look Through Filter for 23cms
|34
|-
|ATV streaming using a Mac
|35
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv244-1.pdf Issue 244 June 2014]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Constitution of the BATC
|9
|-
|Video Processing Circuit
|12
|-
|There’s something different on Fast Scan TV
|16
|-
|Using a small ARM based mini TV box for digital TV
|20
|-
|Online ATV streams and HAMNET
|22
|-
|Streaming Student Robotics 2014
|23
|-
|Treasurer’s Report for 2013
|24
|-
|VK DATV QSO Party
|26
|-
|New Rigol Spectrum Analyser discoveries
|28
|-
|DVB-T-Receiver HV-110
|34
|-
|4K – what is it?
|35
|-
|Classic Circuits - A Tuneable 70cm Narrowband Filter
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv243.pdf Issue 243 March 2014]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|ISS HamTV Received
|9
|-
|BATC CAT14 and the General Meeting
|10
|-
|New Repeaters on the Air
|12
|-
|BATC and you, the Member
|14
|-
|DATV-Express Project
|15
|-
|HamTV from the ISS
|16
|-
|VK6MJ - ISS Tracker
|18
|-
|Using the Raspberry Pi to Control an Ultram VCO
|19
|-
|The BATC Forum
|20
|-
|70cm Yagi
|22
|-
|Versatile Audio AGC Circuit
|23
|-
|Digital ATV – Using a Spectrum Analyzer
|29
|-
|Early Colour Cameras and their problems- Part 2
|34
|-
|Classic Circuits - Remote control using DTMF
|35
|-
|Turning Back the Pages - CQ-TV 56
|37
|-
|Late news - New Geostationary satellite; More
frequency at VHF; the latest ISS news
|39
|}

=====[https://batc.org.uk/wp-content/uploads/CQTV242-1.pdf Issue 242 December 2013]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|DX Records
|8
|-
|Repeater News - GB3GV
|9
|-
|CAT13 - the Finningley report
|11
|-
|A 2.5 Watt LDMOS Driver for the 1.3GHz band
|15
|-
|A Beginner’s Guide to Field Programmable
Gate Arrays (FPGAs) Part 2
|18
|-
|10 GHz Synthesised ATV FM TX
|21
|-
|Early Colour Cameras and their problems- Part 1
|21
|-
|Stand Alone DigiLite with an MK808
|24
|-
|Classic Circuits - Black Level Clamps
|27
|-
|A Tutorial on Displays
|29
|-
|HamTV Bulletin 3
|34
|-
|Digital Integrated Receiver Decoder (IRD)
for use on repeaters
|37
|-
|Low Cost DVB-S Receivers Suitable
For HAMTV Reception
|40
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv241-small.pdf Issue 241 September 2013]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BBC BH and Paul Marshall
|6
|-
|Don Reid
|7
|-
|An Introduction to the DTX1 Transmitter
|10
|-
|DTX1 1st User Review
|11
|-
|PGA103+ Broad Band Amplifier
|12
|-
|CAT13 – the BATC 2013 Convention details
|15
|-
|BATC Presentation for DXSpot.TV
|16
|-
|DXSpot.TV details and information
|17
|-
|BATC Treasurers Report for 2012
|18
|-
|50 years of home video recording
|20
|-
|BATC Training – the Digital Studio part 2
|20
|-
|FPGA programming for beginners. Part 1
|21
|-
|Setting up a Virtual Studio
|30
|-
|History of Television – Monoscope Cameras
|36
|-
|GB3IV Repeater
|38
|-
|A new approach to Digital ATV repeaters in New Zealand
|40
|-
|DATV from the International Space Station – full specification
|44
|}

2013 - 2018 CQ-TV 241 to CQ TV 260

2026-07-14T09:02:57Z

G8GKQ: /* Issue 260 Summer 2018 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv260.pdf Issue 260 Summer 2018]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC 2018 General Meeting
|3
|-
|A potted history of the new BATC website
|10
|-
|DATV on 71 MHz
|12
|-
|71 MHz Transmitter Low Pass Filter
|13
|-
|71 MHz Receive Upconverter
|14
|-
|18W 5GHz band FM-ATV TX
|16
|-
|A piece of Pi
|21
|-
|76GHz tests June 2018
|22
|-
|Video Fundamentals 14
|23
|-
|The BATC Bursary scheme
|26
|-
|Member’s Projects - F1SSF
|26
|-
|HamRadio 2018 Friedrichshafen
|27
|-
|Aligning offset dishes
|28
|-
|The Royal Wedding in High Dynamic Range
|29
|-
|A 3 Watt LDMOS Driver for the 432MHz band
|32
|-
|Portsdown Newsletter
|35
|-
|5.6 GHz ATV – the record DX chase
|37
|-
|Discovering the joys of 5.6GHz ATV
|38
|-
|Roberto Zech, DG0VE, silent key
|40
|-
|Turning Back the Pages - CQ-TV 72
|41
|}

=====Issue 259 Spring 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|CAT18 and the BATC General Meeting
|8
|-
|GDPR and the BATC
|12
|-
|The HamTV Merger
|13
|-
|3D Printed horn antennas
|16
|-
|3404MHz Band Pass Filter
|19
|-
|Narrow-bandwidth Television Association
|20
|-
|Video Fundamentals 13 - test signals
|21
|-
|Running 28v Latched Relays from a 12v Rail
|23
|-
|Customising the adf4351 pic code for your frequency
|27
|-
|My Station - M0DTS
|28
|-
|Minitioune V0.8
|30
|-
|Producing a PIC for the 7 – band local oscillator
|33
|-
|Adding a display to the MiniTiouner-V2
|37
|-
|Updates from Germany from TV-AMATEUR 187
|38
|-
|Portsdown 2018
|41
|-
|Member’s Projects - F6GXI
|43
|-
|Touchscreen control of the DATV-Express
|44
|-
|Turning Back the Pages - CQ-TV 71
|45
|}

-----------------------------------------------------------

You can download a copy of the following magazines, which are more than 2 years old, at https://batc.org.uk/cq-tv/cq-tv-archive/ or by clicking on the issue header on this page.

=====[https://batc.org.uk/wp-content/uploads/cq-tv258.pdf Issue 258 Winter 2017]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|5.6Ghz ATV from Cumbria
|11
|-
|9cm LNB Mounting
|14
|-
|GB3FB - A 9cm Digital ATV Repeater
|15
|-
|G3SMU silent key
|21
|-
|BATC report to the RSGB Spectrum Forum
|22
|-
|Kempton Park Rally - 5th November 2017
|23
|-
|A LED power output indicator
|24
|-
|GB3TZ 5.6GHz input
|25
|-
|5.6 GHz WB ATV Tx
|26
|-
|Portsdown Update
|27
|-
|Portsdown Signal Generator
|29
|-
|Using old laptop screens for ATV
|32
|-
|Miniaturised Pulsed Relay Driver for 28V Microwave Relays
|33
|-
|Converting an old Satellite dish to a 23cm dish antenna
|34
|-
|Arthur C. Clarke
|35
|-
|Using the Tarot 5.6GHz ATV Modules
|36
|-
|Turning Back the Pages - CQ-TV 70
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv257.pdf Issue 257 Autumn 2017]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2016
|9
|-
|DigiTwist
|10
|-
|The ADALM-PLUTO low cost SDR
|14
|-
|Silent Keys - G8AJN & G3KTU
|16
|-
|Video Fundamentals 12
|17
|-
|Using a MinimOSD board for On Screen Callsign Display
|19
|-
|Antenna range tests at Finningley for the BATC
|21
|-
|The Portsdown Digital ATV Transmitter A Beginner’s Guide
|22
|-
|The Portsdown Transmitter – Security Aspects
|26
|-
|Notes on Amplifiers & Filters
|27
|-
|A Vintage Pye Camera
|29
|-
|5.6 GHz progress
|30
|-
|CAT17 report
|31
|-
|Repeater Update - October 2017
|33
|-
|The Bang-good 23cm aerial
|34
|-
|The Portsdown Transmitter in pictures
|35
|-
| A Coupler probe for use with the Rigol DSA 815-TG
Spectrum Analyser
|36
|-
|Turning Back the Pages - CQ-TV 69
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv256.pdf Issue 256 Summer 2017]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Portsdown Transmitter Construction Competition
|10
|-
|Power Amplifier for DATV
|11
|-
|DATV Moonbounce from Goonhilly
|12
|-
|The Portsdown Transmitter Software
|15
|-
|8 GHz eBay Power Meter
|17
|-
|CAT 17 – September 9th and 10th 2017
|18
|-
|eBay Ampliiers
|19
|-
|MiniTioune Mark 2 DVB-S digital receiver
|20
|-
|Video Fundamentals 11: Studio systems – the Matrix
|23
|-
|My Station: Malcolm Johnson, G0UHY
|25
|-
|A cheap and easy 6cm ATV transceiver
|26
|-
|Ham Radio: DATV-Forum – the latest trends
|28
|-
|Known Digital ATV DX Records
|29
|-
|BATC website development
|30
|-
|Wideband LNBs
|31
|-
|Turning Back the Pages - CQ-TV 68
|32
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv255.pdf Issue 255 Spring 2017]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|AMSAT North America
Phase 4 Ground Segment Project
|10
|-
|Packaging Digithin
|11
|-
|The Portsdown Project - Overview
|12
|-
|The Portsdown so far…
A users experience of the build
|14
|-
|Portsdown Filter-Modulator Board -
Construction and Testing
|16
|-
|Portsdown Filter-Modulator Board Modifications
|18
|-
|ATV on TV - The day TX Factor came to visit
|20
|-
|G8LES Link Video recorder integration
|22
|-
|Could you help with the Scouts’ JOTA 2017?
|25
|-
|GB3ZZ Experimental Inputs
|26
|-
|BATC website development
|29
|-
|Relocation of the John Lawrence Valve Collection
|30
|-
|Es’hail-2 Ground Segment Planning Meeting
|31
|-
|Video Fundamentals 10: The Mixer
|32
|-
|A high performance ATV upconverter
|34
|-
|Turning Back the Pages - CQ-TV 67
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv254.pdf Issue 254 Winter 2016]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Portsdown DATV project
|11
|-
|The Portsdown Raspberry Pi-based DATV
Transmitter - Introduction
|14
|-
|Constructing the Portsdown Raspberry
Pi-based DATV Transmitter
|16
|-
|Software for the Portsdown Raspberry
Pi-based DATV Transmitter
|18
|-
|HamTV Update
|21
|-
|My Station - Tony Hornby, G1HBD
|22
|-
|BATC report to the RSGB Spectrum Forum
|24
|-
|Video Fundamentals 9 - Genlock and
Reference Signals
|26
|-
|Gilwell 24 - 2016
|28
|-
|Turning Back the Pages - CQ-TV 66
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv253v2.pdf Issue 253 Autumn 2016]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The ADF4351 flexible signal source
|9
|-
|7-band local oscillator
|9
|-
|ADF4351 driven by an Arduino
|13
|-
|GB3HV 70cms input update
|15
|-
|A 437 MHz DVB-S Transmitter
Using a Raspberry Pi
|16
|-
|The Making of ‘TXFactor’
|20
|-
|CAT16 - the full story
|23
|-
|VMix to RpiDATV via FFmpeg
|26
|-
|Noise Power meter for the Minitiouner
|27
|-
|Video Fundamentals 8
|28
|-
|DN1JKG calling OR4ISS
|30
|-
|DATV-Express on Windows
|32
|-
|Here and There...
|34
|-
|New and renewing members
|35
|-
|Turning Back the Pages - CQ-TV 65
|36
|-
|High Tech Wearables
|38
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv252v2.pdf Issue 252 Summer 2016]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Biennial General Meeting – Postal Votes
|6
|-
|CAT 16 Details
|11
|-
|Treasurers Report for 2015
|12
|-
|Dual Filter Board for DigiLite 5.9
|14
|-
|New super tuner design for dvb-s and s2
|17
|-
|HAMPADS: HAM-Portable Affordable Dish
for Satellites
|18
|-
|Summer ATV Contest Images
|23
|-
|Video Fundamentals 7 - Camera Signal Processing
|24
|-
|The Matilda Story
|26
|-
|My Station - Peter Yarde, G8DKC
|35
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv251v2.pdf Issue 251 Spring 2016]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|CAT 16 and BATC AGM
| 9
|-
|Peter Blakeborough, G3PYB - Silent Key
|10
|-
|A BATC Wiki
|12
|-
|The Principia Mission - Give us a wave Tim!
|14
|-
|Social Media
|18
|-
|Simple Antenna Tracker for the ISS
|20
|-
|Animated Test Cards
|22
|-
|My Station - G8VPG **New Feature**
|24
|-
|Activity at GB3ET
|25
|-
|Video Fundamentals 6
|26
|-
|DATV-Express power amplifiers
|28
|-
|Reduced Bandwidth TV Modulator
|32
|-
|New Application for DATV-Express
|34
|-
|More Modifications to the SUP-2400
|35
|-
|leandvb: A lightweight software DVB-S demodulator
|36
|-
|Open Broadcaster Software with DATV-Express
|40
|-
|SUP-2400 DiSEqC update
|45
|-
|Getting started in ATV - DATV reception
|46
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv250-1.pdf Issue 250 Winter 2015]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Latest developments at GB3GV
|6
|-
|BATC report to RSGB Spectrum Forum
|8
|-
|Alan Daw, G1APD - sk
|9
|-
|ARISS and HamTV - Supporting the Principia Mission
|10
|-
|Goonhilly Earth Station
|12
|-
|Variable SR filter for RB-TV
|14
|-
|The HamTV antennas on the ISS
|16
|-
|Using the SUP-2400 for 146.5 MHz Reception
|17
|-
|An outing for the LDK5 camera
|19
|-
|Amateur Television “Getting Started”
|20
|-
|Getting Started with RB-TV
|25
|-
|A bandpass filter for 146.5 MHz
|28
|-
|DiSEqC control for the SUP2400
|29
|-
|Video Fundamentals - Part5
|31
|-
|Simple System to Receive ARISS HamTV
|33
|-
|Using FFmpeg to generate a transport stream
|34
|-
|DATV transmission in the UK – a short history
|40
|-
|Using the Linx 1010b tablet for portable DATV
|44
|-
|GB3HV Christmas Dinner
|46
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv249-1.pdf Issue 249 Autumn 2015]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Outside Broadcast with the BATC
|9
|-
|146MHz RD70HVF1 Amp
|11
|-
|24GHz building blocks
|12
|-
|2 watt driver amplifiers for 1296 and 2304MHz
|15
|-
|HD TV news from Germany
|19
|-
|Slow Scan TV with a Raspberry Pi
|23
|-
|vMix using FFmpeg to create the Transport Stream
|27
|-
|Michael Hastings, G8ASI sk
|32
|-
|CAT 15 - A weekend of technical presentations
|33
|-
|Video Fundamentals - Part4: The Camera’s Eye
|35
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv248-1.pdf Issue 248 Summer 2015]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|RB-TV Roundup
|10
|-
|The Low SR World Conquest
|11
|-
|DATV Developments in North Wales
|16
|-
|Minitiouner - USB Tuner Module
|20
|-
|Narrow band DATV on the BATC DTX1
|25
|-
|Product Review - PE1RKI 23cm four pole filter
|27
|-
|vMix using FFmpeg to create the Transport Stream
|27
|-
|Video Fundamentals - Part 3: Picture Monitor
|29
|-
|Video Sync generator
|31
|-
|A Field Day station with PC6REC
|36
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv247-1.pdf Issue 247 Spring 2015]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|New 70MHz band for RB-DATV
|9
|-
|A Two way on 146.5MHz RB-DATV
|10
|-
|146MHz RD06+RD15 Amp
|12
|-
|New Life for Old Rotators
|13
|-
|A Guide to setting up the DATV Express for
RB-DATV Operation on 146.5MHz
|15
|-
|Portsmouth RB-TV Meeting
|17
|-
|DigiThin - A Narrowband QPSK Modulator for the Raspberry Pi
|19
|-
|DigiThin Beta Testing
|22
|-
|Add-On Transport Stream Dock for BATC DTX1
|23
|-
|RPiDATV software improvements
|25
|-
|GB3KM - the first year of operating on 3.4GHz
|26
|-
|ATV image generator using the Raspberry Pi
|28
|-
|Local oscillators in 1.2GHz band, for Digilite DATV System
|29
|-
|RB-TV receiver developments
|31
|-
|Comparing DATV models
|32
|-
|Video Fundamentals 2 - Colour Bars
|34
|-
|Classic circuits - PicDream
|36
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv246-1.pdf Issue 246 December 2014]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum Oct 14
|11
|-
|Reduced Bandwidth DATV (RB-TV)
|13
|-
|RB-TV Awards Programme
|17
|-
|Antennair DTX-F70 and the Antennair DTX-F23
|18
|-
|Understanding DATV RF Bandwidth for DVB-S
|20
|-
|IARU Region 1 General Conference Report
|23
|-
|Video Fundamentals 1 – The Line Sync Pulse
|25
|-
|BATC Streaming Service
|26
|-
|RPiDATV RB-TV transmit system
|28
|-
|BATC New subscription rates
|33
|-
|MAX On-Screen-Display Generator
|34
|-
|Classic circuits – General Purpose Amplifier
|36
|-
|Digital-ATV - Using ODROID with the DATV-Express board
|37
|-
|GoPro Hero 4
|42
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv245-1.pdf Issue 245 September 2014]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|CAT14 - in words and pictures
|8
|-
|DVB-S on the Solent - Part 1
|10
|-
|The Marconi at CAT14
|11
|-
|Effect of Phase Noise on a DVB-S Signal
|14
|-
|DVB-S on the Solent - Part 2
|15
|-
|Weak Signal Performance of DVB-S Receivers
|17
|-
|Geostationary ATV could be on its way!
|19
|-
|Museo de la Imagen - Santiago de Cuba, Cuba
|20
|-
|Annual Worldwide ATV QSO Party
|23
|-
|DVB-T with a Hides HV110
|30
|-
|IARU Region 1 Conference
|31
|-
|A Filter for 437MHz
|32
|-
|Classic Circuits - a Look Through Filter for 23cms
|34
|-
|ATV streaming using a Mac
|35
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv244-1.pdf Issue 244 June 2014]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Constitution of the BATC
|9
|-
|Video Processing Circuit
|12
|-
|There’s something different on Fast Scan TV
|16
|-
|Using a small ARM based mini TV box for digital TV
|20
|-
|Online ATV streams and HAMNET
|22
|-
|Streaming Student Robotics 2014
|23
|-
|Treasurer’s Report for 2013
|24
|-
|VK DATV QSO Party
|26
|-
|New Rigol Spectrum Analyser discoveries
|28
|-
|DVB-T-Receiver HV-110
|34
|-
|4K – what is it?
|35
|-
|Classic Circuits - A Tuneable 70cm Narrowband Filter
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv243.pdf Issue 243 March 2014]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|ISS HamTV Received
|9
|-
|BATC CAT14 and the General Meeting
|10
|-
|New Repeaters on the Air
|12
|-
|BATC and you, the Member
|14
|-
|DATV-Express Project
|15
|-
|HamTV from the ISS
|16
|-
|VK6MJ - ISS Tracker
|18
|-
|Using the Raspberry Pi to Control an Ultram VCO
|19
|-
|The BATC Forum
|20
|-
|70cm Yagi
|22
|-
|Versatile Audio AGC Circuit
|23
|-
|Digital ATV – Using a Spectrum Analyzer
|29
|-
|Early Colour Cameras and their problems- Part 2
|34
|-
|Classic Circuits - Remote control using DTMF
|35
|-
|Turning Back the Pages - CQ-TV 56
|37
|-
|Late news - New Geostationary satellite; More
frequency at VHF; the latest ISS news
|39
|}

=====[https://batc.org.uk/wp-content/uploads/CQTV242-1.pdf Issue 242 December 2013]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|DX Records
|8
|-
|Repeater News - GB3GV
|9
|-
|CAT13 - the Finningley report
|11
|-
|A 2.5 Watt LDMOS Driver for the 1.3GHz band
|15
|-
|A Beginner’s Guide to Field Programmable
Gate Arrays (FPGAs) Part 2
|18
|-
|10 GHz Synthesised ATV FM TX
|21
|-
|Early Colour Cameras and their problems- Part 1
|21
|-
|Stand Alone DigiLite with an MK808
|24
|-
|Classic Circuits - Black Level Clamps
|27
|-
|A Tutorial on Displays
|29
|-
|HamTV Bulletin 3
|34
|-
|Digital Integrated Receiver Decoder (IRD)
for use on repeaters
|37
|-
|Low Cost DVB-S Receivers Suitable
For HAMTV Reception
|40
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv241-small.pdf Issue 241 September 2013]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BBC BH and Paul Marshall
|6
|-
|Don Reid
|7
|-
|An Introduction to the DTX1 Transmitter
|10
|-
|DTX1 1st User Review
|11
|-
|PGA103+ Broad Band Amplifier
|12
|-
|CAT13 – the BATC 2013 Convention details
|15
|-
|BATC Presentation for DXSpot.TV
|16
|-
|DXSpot.TV details and information
|17
|-
|BATC Treasurers Report for 2012
|18
|-
|50 years of home video recording
|20
|-
|BATC Training – the Digital Studio part 2
|20
|-
|FPGA programming for beginners. Part 1
|21
|-
|Setting up a Virtual Studio
|30
|-
|History of Television – Monoscope Cameras
|36
|-
|GB3IV Repeater
|38
|-
|A new approach to Digital ATV repeaters in New Zealand
|40
|-
|DATV from the International Space Station – full specification
|44
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T09:02:00Z

G8GKQ: /* Issue 261 Autumn 2018 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv274.pdf Issue 274 Winter 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv273.pdf Issue 273 Autumn 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv272.pdf Issue 272 Summer 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv271.pdf Issue 271 Spring 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv270.pdf Issue 270 Winter 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv269.pdf Issue 269 Autumn 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv268.pdf Issue 268 Summer 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv267.pdf Issue 267 Spring 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv266.pdf Issue 266 Winter 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv265.pdf Issue 265 Autumn 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv264.pdf Issue 264 Summer 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv263.pdf Issue 263 Spring 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv262.pdf Issue 262 Winter 2018]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv261.pdf Issue 261 Autumn 2018]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T09:01:42Z

G8GKQ: /* Issue 262 Winter 2018 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv274.pdf Issue 274 Winter 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv273.pdf Issue 273 Autumn 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv272.pdf Issue 272 Summer 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv271.pdf Issue 271 Spring 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv270.pdf Issue 270 Winter 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv269.pdf Issue 269 Autumn 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv268.pdf Issue 268 Summer 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv267.pdf Issue 267 Spring 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv266.pdf Issue 266 Winter 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv265.pdf Issue 265 Autumn 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv264.pdf Issue 264 Summer 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv263.pdf Issue 263 Spring 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv262.pdf Issue 262 Winter 2018]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T09:01:27Z

G8GKQ: /* Issue 263 Spring 2019 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv274.pdf Issue 274 Winter 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv273.pdf Issue 273 Autumn 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv272.pdf Issue 272 Summer 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv271.pdf Issue 271 Spring 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv270.pdf Issue 270 Winter 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv269.pdf Issue 269 Autumn 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv268.pdf Issue 268 Summer 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv267.pdf Issue 267 Spring 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv266.pdf Issue 266 Winter 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv265.pdf Issue 265 Autumn 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv264.pdf Issue 264 Summer 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv263.pdf Issue 263 Spring 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T09:01:07Z

G8GKQ: /* Issue 264 Summer 2019 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv274.pdf Issue 274 Winter 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv273.pdf Issue 273 Autumn 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv272.pdf Issue 272 Summer 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv271.pdf Issue 271 Spring 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv270.pdf Issue 270 Winter 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv269.pdf Issue 269 Autumn 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv268.pdf Issue 268 Summer 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv267.pdf Issue 267 Spring 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv266.pdf Issue 266 Winter 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv265.pdf Issue 265 Autumn 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv264.pdf Issue 264 Summer 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T09:00:51Z

G8GKQ: /* Issue 265 Autumn 2019 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv274.pdf Issue 274 Winter 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv273.pdf Issue 273 Autumn 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv272.pdf Issue 272 Summer 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv271.pdf Issue 271 Spring 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv270.pdf Issue 270 Winter 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv269.pdf Issue 269 Autumn 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv268.pdf Issue 268 Summer 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv267.pdf Issue 267 Spring 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv266.pdf Issue 266 Winter 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv265.pdf Issue 265 Autumn 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T09:00:36Z

G8GKQ: /* Issue 266 Winter 2019 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv274.pdf Issue 274 Winter 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv273.pdf Issue 273 Autumn 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv272.pdf Issue 272 Summer 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv271.pdf Issue 271 Spring 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv270.pdf Issue 270 Winter 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv269.pdf Issue 269 Autumn 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv268.pdf Issue 268 Summer 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv267.pdf Issue 267 Spring 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv266.pdf Issue 266 Winter 2019]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T09:00:21Z

G8GKQ: /* Issue 267 Spring 2020 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv274.pdf Issue 274 Winter 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv273.pdf Issue 273 Autumn 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv272.pdf Issue 272 Summer 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv271.pdf Issue 271 Spring 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv270.pdf Issue 270 Winter 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv269.pdf Issue 269 Autumn 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv268.pdf Issue 268 Summer 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv267.pdf Issue 267 Spring 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====Issue 266 Winter 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T09:00:04Z

G8GKQ: /* Issue 268 Summer 2020 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv274.pdf Issue 274 Winter 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv273.pdf Issue 273 Autumn 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv272.pdf Issue 272 Summer 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv271.pdf Issue 271 Spring 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv270.pdf Issue 270 Winter 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv269.pdf Issue 269 Autumn 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv268.pdf Issue 268 Summer 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====Issue 267 Spring 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====Issue 266 Winter 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T08:59:50Z

G8GKQ: /* Issue 269 Autumn 2020 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv274.pdf Issue 274 Winter 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv273.pdf Issue 273 Autumn 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv272.pdf Issue 272 Summer 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv271.pdf Issue 271 Spring 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv270.pdf Issue 270 Winter 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv269.pdf Issue 269 Autumn 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====Issue 268 Summer 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====Issue 267 Spring 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====Issue 266 Winter 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T08:59:36Z

G8GKQ: /* Issue 270 Winter 2020 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv274.pdf Issue 274 Winter 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv273.pdf Issue 273 Autumn 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv272.pdf Issue 272 Summer 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv271.pdf Issue 271 Spring 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv270.pdf Issue 270 Winter 2020]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====Issue 269 Autumn 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====Issue 268 Summer 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====Issue 267 Spring 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====Issue 266 Winter 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T08:59:21Z

G8GKQ: /* Issue 271 Spring 2021 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv274.pdf Issue 274 Winter 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv273.pdf Issue 273 Autumn 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv272.pdf Issue 272 Summer 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv271.pdf Issue 271 Spring 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 270 Winter 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====Issue 269 Autumn 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====Issue 268 Summer 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====Issue 267 Spring 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====Issue 266 Winter 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T08:59:02Z

G8GKQ: /* Issue 272 Summer 2021 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv274.pdf Issue 274 Winter 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv273.pdf Issue 273 Autumn 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv272.pdf Issue 272 Summer 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====Issue 271 Spring 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 270 Winter 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====Issue 269 Autumn 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====Issue 268 Summer 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====Issue 267 Spring 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====Issue 266 Winter 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T08:58:46Z

G8GKQ: /* Issue 273 Autumn 2021 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv274.pdf Issue 274 Winter 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv273.pdf Issue 273 Autumn 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 272 Summer 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====Issue 271 Spring 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 270 Winter 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====Issue 269 Autumn 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====Issue 268 Summer 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====Issue 267 Spring 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====Issue 266 Winter 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T08:58:31Z

G8GKQ: /* Issue 274 Winter 2021 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv274.pdf Issue 274 Winter 2021]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====Issue 273 Autumn 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 272 Summer 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====Issue 271 Spring 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 270 Winter 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====Issue 269 Autumn 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====Issue 268 Summer 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====Issue 267 Spring 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====Issue 266 Winter 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T08:58:13Z

G8GKQ: /* Issue 275 Spring 2022 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv275.pdf Issue 275 Spring 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====Issue 274 Winter 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====Issue 273 Autumn 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 272 Summer 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====Issue 271 Spring 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 270 Winter 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====Issue 269 Autumn 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====Issue 268 Summer 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====Issue 267 Spring 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====Issue 266 Winter 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T08:57:56Z

G8GKQ: /* Issue 276 Summer 2022 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv276.pdf Issue 276 Summer 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 275 Spring 2022=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====Issue 274 Winter 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====Issue 273 Autumn 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 272 Summer 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====Issue 271 Spring 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 270 Winter 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====Issue 269 Autumn 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====Issue 268 Summer 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====Issue 267 Spring 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====Issue 266 Winter 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T08:57:36Z

G8GKQ: /* Issue 277 Autumn 2022 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv277.pdf Issue 277 Autumn 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====Issue 276 Summer 2022=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 275 Spring 2022=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====Issue 274 Winter 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====Issue 273 Autumn 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 272 Summer 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====Issue 271 Spring 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 270 Winter 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====Issue 269 Autumn 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====Issue 268 Summer 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====Issue 267 Spring 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====Issue 266 Winter 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T08:57:16Z

G8GKQ: /* Issue 278 Winter 2022 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv278.pdf Issue 278 Winter 2022]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====Issue 277 Autumn 2022=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====Issue 276 Summer 2022=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 275 Spring 2022=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====Issue 274 Winter 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====Issue 273 Autumn 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 272 Summer 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====Issue 271 Spring 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 270 Winter 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====Issue 269 Autumn 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====Issue 268 Summer 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====Issue 267 Spring 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====Issue 266 Winter 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T08:56:55Z

G8GKQ: /* Issue 279 Spring 2023 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv279.pdf Issue 279 Spring 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 278 Winter 2022=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====Issue 277 Autumn 2022=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====Issue 276 Summer 2022=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 275 Spring 2022=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====Issue 274 Winter 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====Issue 273 Autumn 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 272 Summer 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====Issue 271 Spring 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 270 Winter 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====Issue 269 Autumn 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====Issue 268 Summer 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====Issue 267 Spring 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====Issue 266 Winter 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2018 - 2023 CQ-TV 261 to CQ-TV 280

2026-07-14T08:56:31Z

G8GKQ: /* Issue 280 Summer 2023 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====[https://batc.org.uk/wp-content/uploads/cq-tv280.pdf Issue 280 Summer 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|News from the Treasurer
|7
|-
|The future of 23cms – update
|9
|-
|ARISS International Meeting April 2023
|10
|-
|How to connect the receiver and transmitter to the feed?
|13
|-
|The Raspberry Pi disk imager
|15
|-
|Cheapskate’s “Stream Deck” alternative
|16
|-
|Amateur television comes to the farm
|17
|-
|Dish experiments for /P operation
|19
|-
|My Shack - Dave, G8GKQ
|21
|-
|Rechargeable battery for occasional use
|23
|-
|The BATC HDMI video source
|25
|-
|Signal Box
|25
|-
|Norbreck Rally 2023
|28
|-
|Turning Back the Pages
|29
|}

=====Issue 279 Spring 2023=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Treasurers Report for 2022
|10
|-
|Rx-Tx changeover control board
|12
|-
|Receiving HAMTV
|14
|-
|GB3NQ H264/H265 encoder box
|17
|-
|IARU Region 1 ATV Contest
|19
|-
|Network remote control for the Yaesu G5500 rotator
|20
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|Portable power for 28V and 50V
|21
|-
|Tributes paid to TV amateur- Roger G8IUC
|23
|-
|Making a front panel fascia using a vinyl label
|24
|-
|The LimeSDR Mini 2.2
|25
|-
|Wideband data tests on QO-100
|26
|-
|Band filters on epoxy board and simulation software
|27
|-
|The Portsdown Newsletter
|30
|-
|OpenTuner Windows software for MiniTiouner hardware
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 278 Winter 2022=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Hamfest report
|7
|-
|IMPORTANT - Change of BATC bank details
|7
|-
|29MHz transatlantic DATV experiments
|8
|-
|Simple 144MHz to 29MHz transverter
|9
|-
|Beware the inverted Spectrum with SDR Angel…
|9
|-
|It’s DATV Jim, but not as we know it
|10
|-
|Sending High Speed Data over HF Channels
|11
|-
|BATC-branded shirts (and other items)
|14
|-
|Height and position of your antenna is important!
|15
|-
|A prototype DATV repeater
|20
|-
|The Portsdown Newsletter
|24
|-
|SSTV on GB3GG
|26
|-
|SM ATV exciter for 23cm, 13cm or 6cm
|27
|-
|A noise source for my Portsdown 4
|30
|-
|Noise source offer
|30
|-
|BATC at Midlands Round Table - December 22
|31
|-
|Introduction to ATV videos
|32
|-
|Taming the Pluto in a Portsdown 4/Langstone
|32
|-
|Portable operation at the Crystal Palace Radio and Electronics Club
|33
|-
|G8TA centenary DATV unit build
|34
|-
|Turning Back the Pages
|37
|}

=====Issue 277 Autumn 2022=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Derek G. Whitehead GW3FDZ (SK)
|6
|-
|Experiments with filters
|9
|-
|Multiviewer script for the BATC streamer
|12
|-
|To what extent can contact paths be predicted?
|13
|-
|CAT 22 part II Agenda
|18
|-
|The Portsdown Newsletter
|19
|-
|The BATC General Meeting
|21
|-
|A selection of images from CAT22
|25
|-
|IARU Region 1 2022 ATV Contest Results
|26
|-
|Possible IARU Region 1 ATV contest rule changes
|28
|-
|Networked remote DATV receiver - Longmynd Client
|30
|-
|Options for a Digital ATV Repeater Transmitter
|35
|-
|Out and about at the McMichael rally…
|36
|-
|The wonderful world of surplus
|37
|-
|Turning Back the Pages
|40
|-
|Hungarian DX-TV Reception
|43
|}

=====Issue 276 Summer 2022=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC Accounts 2021
|10
|-
|The “Portsdown Double”
|11
|-
|The Portsdown Newsletter
|12
|-
|Long distance DATV contacts
|13
|-
|What to go for - Yagi or dish?
|14
|-
|Microphone amplifiers and audio level setting
|18
|-
|Electromagnetic Field
|20
|-
|Filtering Is important on receive as well
|23
|-
|An alternative DATV repeater controller update
|23
|-
|Former BATC president - silent key
|27
|-
|BATC representation at HamRadio 2022
|28
|-
|Contest adventures and misadventures
|29
|-
|The future of 23cms – update June 2022
|30
|-
|Ryde Newsletter
|31
|-
|The inside scoop - ‘Mr Whippy’
|32
|-
|BATC represented at the NARSA Blackpool Rally
|33
|-
|RP2040 – a Microcontroller Chip from the Raspberry Pi Foundation
|34
|-
|IARU 2021 Contest Awards
|37
|-
|Internet repeater in north Cumbria
|38
|-
|The Tilt-O-Matic
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 275 Spring 2022=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Activity Ladder updates & KITTENS 22
|10
|-
|BATC ATV repeater controller
|11
|-
|Eight channel I2C controlled audio switch
|14
|-
|GB3NQ Digital ATV Repeater Goes Fully Digital
|15
|-
|How to evaluate your signal…
|17
|-
|An alternative DATV repeater controller
|19
|-
|BATC attending HAMRADIO 2022
|26
|-
|G1MFG silent key
|26
|-
|Composite Video to HDMI Converter
|27
|-
|Portsdown Exhibited at The National Museum of Computing
|28
|-
|The Portsdown Newsletter
|29
|-
|BBC MCR21 Outside Broadcast van update
|31
|-
|A flat-plate antenna for 24cms
|32
|-
|Another use for the BATC Noise Figure Power supply board
|33
|-
|Exploring new technologies and approaches for DATV Repeaters
|34
|-
|Modifications to Nokia single transistor pallet for 2.4GHz
|36
|-
|Turning Back the Pages
|37
|-
|In memoriam
|39
|}

=====Issue 274 Winter 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB spectrum Forum
|10
|-
|Duplex filter for 13 and 23/24 cm
|12
|-
|The Portsdown noise figure meter
|14
|-
|Ryde Update
|18
|-
|EMF compliance for ATV Operation
|19
|-
|A nice little ‘Ryde’ in the country
|20
|-
|ISS SSTV in late December
|21
|-
|Noise sources for NF measurement
|22
|-
|QO-100 Accessory Unit
|24
|-
|SatController & SatServer
|25
|-
|Noise Source Power Supply
|27
|-
|The Portsdown Newsletter
|29
|-
|Out and about – David Holman M0YDH
|30
|-
|GB3NQ Transmitter Upgrade
|31
|-
|Turning Back the Pages
|33
|}

=====Issue 273 Autumn 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The Portsdown Newsletter
|7
|-
|Reliability improvement for the Portsdown eight-way RF switch
|9
|-
|CAT 21 part one – a report
|11
|-
|My Station - G8HKN
|13
|-
|Dishes and their feeds
|14
|-
|Setting up OBS for DATV
|20
|-
|IARU Region 1 ATV contest 2021 results
|22
|-
|Portsdown 4 peripheral interface
|24
|-
|It’s that time of year to check your Oscar 100 dish
|25
|-
|A Ryde receiver for GB3EN
|26
|-
|Portsdown 4 power meter
|27
|-
|A retro high-resolution dish alignment meter for the digitally-challenged
|29
|-
|Reflections from Mont Blanc
|31
|-
|It will come in useful one day…
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 272 Summer 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|QO-100 Transponder Availability Warning
|7
|-
|Ryde update – latest news
|9
|-
|BATC awarded the Louis Varney Cup
|9
|-
|Ryde Utilities
|10
|-
|LimeRFE Multiband PA and Preamp
|11
|-
|In search of less windage
|12
|-
|Software for BATC projects
|13
|-
|Portsdown 4
|14
|-
|Video source, video generated by an Arduino
|21
|-
|A basic logic controller for hybrid ATV repeaters
|24
|-
|BBC MCR21 progress report June 2021
|26
|-
|Arduino Stream Pad
|27
|-
|The Portsdown Newsletter
|28
|-
|A history of GB3GG
|30
|-
|Using the NWDZ amplifier as a DATV driver
|31
|-
|BATC general meeting postponement notice
|32
|-
|My QO-100 DATV station
|33
|-
|Simple single range high power meter for 23cms or 13cms
|36
|-
|The ‘Boxer’, a brick amplifier for 24cms
|38
|-
|Out and About…
|40
|-
|Turning Back the Pages
|41
|-
|Slowscan TV from the ISS
|43
|}

=====Issue 271 Spring 2021=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Why is my repeater delayed by 15 seconds?
|8
|-
|2020 Christmas Repeater Contest Report
|9
|-
|Portsdown 4 – Start here
|10
|-
|ATV frequencies and recommended modes
|13
|-
|Reduced bandwidth DVB-T for DATV use
|14
|-
|Reduced-Bandwidth DVB-T Receive Systems
|16
|-
|Reduced-Bandwidth DVB-T Transmit Systems
|18
|-
|WinterHill - a four-channel DATV receiver
|20
|-
|The BATC Forum
|24
|-
|How to make a horn (reference) antenna
|25
|-
|A look at the History of BBC Outside Broadcast Vans
|29
|-
|Ian Waters, G3KKD - Silent Key
|32
|-
|GB3FT Digital Repeater upgrade
|33
|-
|Alternatives to the Elgato Streamdeck
|36
|-
|Modifications to Nokia PA PCB
|37
|-
|My Portsdown4/Langstone combo
|39
|-
|Turning Back the Pages
|41
|}

=====Issue 270 Winter 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Bursary Scheme
|6
|-
|BATC report to the RSGB Spectrum Forum
|7
|-
|A quick word about “SATSAGEN”
|11
|-
|Composite Video Source
|13
|-
|CAT20 - a review
|15
|-
|BATC project status – December 2020
|18
|-
|Modifying the Nooelec Ham it up Up-converter for 71 MHz DATV
|20
|-
|How to use a Pluto for DATV
|21
|-
|Modifications to a board from Bison Electronics
|27
|-
|The Portsdown Newsletter
|28
|-
|Building the Ryde Receiver
|29
|-
|A TCXO for QO-100
|31
|-
|Television History – Live! Part 2
|33
|-
|9 cm station from Wimax components
|37
|-
|Turning Back the Pages
|41
|}

=====Issue 269 Autumn 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IARU Region 1 ATV Contest 2020
|10
|-
|BATC Convention for Amateur Television 2020 (CAT 20)
|11
|-
|Treasurer’s Report for 2018 & 2019
|12
|-
|Report from PI9CAM during the Dutch ATV Contest on September 13
|14
|-
|The Ryde set top box receiver for DATV
|15
|-
|In search of maximum talk-back
|17
|-
|Eight Band contact with G3VKV
|18
|-
|Setting up the Jetson Nanobox Software
|19
|-
|Jetson NanoBox Part 2 - The LKV373A HDMI Interface
|22
|-
|The BMD ATEM range of video switchers
|24
|-
|Every ATEM Needs a Companion
|26
|-
|Replacing a Sharp Tuner with a Serit
|28
|-
|Power & Outside Broadcast Vans
|30
|-
|Jetson Nano PTT switching
|31
|-
|VK3RTV Melbourne Australia July 2020
|32
|-
|The Portsdown 4
|34
|-
|Reduced bandwidth analogue ATV, the easy (lazy?) way
|38
|-
|Portable stable bias voltage
|41
|-
|Turning Back the Pages
|42
|}

=====Issue 268 Summer 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Dutch analogue ATV experiments in the 6 cm band
|10
|-
|Using UDP for Sending Video over a Network
|14
|-
|Portsdown Newsletter
|16
|-
|Cost-effective multiband dish feed
|18
|-
|Our History in Eight Badges
|20
|-
|DATV Express 1.25LP14 in practice
|21
|-
|The BATC Library
|24
|-
|Skype as a repeater input
|25
|-
|An introduction to Video Editors
|27
|-
|Ex broadcast ‘LGT’ amplifiers in 436MHz DVB-S service
|29
|-
|Configuring a Router for the Jetson NanoBOX
|30
|-
|Experiments on 4 metres
|31
|-
|Converting a TV repeater to widescreen on the cheap
|32
|-
|CAT 20 Will Happen, But Online
|33
|-
|Television History – Lives
|34
|-
|A 2.4GHz Interdigital Bandpass Filter
|38
|-
|Lock Light Mod for the DVB-S2 Combo Receiver
|40
|-
|Turning Back the Pages
|41
|-
|DATV activity contest report
|43
|}

=====Issue 267 Spring 2020=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|One Year of Operation for the Goonhilly WebSDRs for QO-100
|8
|-
|Neat Housing for the Portsdown 7-Inch Screen with Pi Camera
|9
|-
|ATV repeater PI6ATS
|10
|-
|Electronic push button on-off switch for the Portsdown
|12
|-
|DATV Activity in North Northamptonshire
|13
|-
|CQ-TV, the BATC and you, our members
|14
|-
|A new controller for VK2RTS
|15
|-
|Don Saunders, G0WFT - silent key
|18
|-
|DATV repeater receiver with active video switch
|19
|-
|BBC MCR21’s Sound Mixer Desk and audio systems
|21
|-
|Remote Repeater and Station Monitoring with Modbus (Part 1)
|23
|-
|Video production with a smartphone part two
|27
|-
|Revived Terrestrial Activity
|28
|-
|Portsdown Newsletter
|29
|-
|A 10 Watt Linear Amplifier for 70cms DATV or narrowband modes
|30
|-
|A compact 12 volt Beam Antenna rotator
|31
|-
|Turning Back the Pages - CQ-TV 78
|32
|}

=====Issue 266 Winter 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|A New Repeater Transmission Standard for the 2020s
|9
|-
|BATC report to the RSGB Spectrum Forum
|12
|-
|ADALM-PLUTO DATV TX – “How To”
|14
|-
|A 30 watt driver amplifier for 2.4 GHz
|19
|-
|Out portable for the BATC November Activity weekend
|21
|-
|5.6 GHz TV Receiver
|22
|-
|Using the Jetson Nano with the LongMynd software
|25
|-
|GB3ET Repeater
|27
|-
|Video Fundamentals 20 - Outside Broadcast Vans
|28
|-
|Portsdown Newsletter
|30
|-
|25 MHz reference, biasT and diplexer for QO-100
|31
|-
|The Secret Life of a TV Repeater
|33
|-
|Jamboree on the Air and QO-100
|35
|-
|CAT 19 South - a short report
|36
|-
|Turning Back the Pages
|37
|-
|DATV at the SDR Makerspace Conference
|39
|}

=====Issue 265 Autumn 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC bursary scheme
|7
|-
|IARU Region 1 ATV Contest 2019 Results
|8
|-
|OBS and the Portsdown
|10
|-
|Using Mitsubishi MOSFET power modules with PE1RKI kits
|13
|-
|Telling the Story of MCR21
|16
|-
|Video Fundamentals 19
|18
|-
|The Jetson NanoBox
|20
|-
|LNB power supply with current limit for MiniTiouner
|22
|-
|A 250 Watt amplifier for Es’Hail-2 DATV
|23
|-
|Portsdown Newsletter
|26
|-
|The RSGB filming a new promotional video
|27
|-
|The LimeNET Micro – a Single-board DATV Transmitter
|28
|-
|Spectrum Matters
|29
|-
|The LongMynd Receiver on the Portsdown
|30
|-
|The LongMynd Receiver
|32
|-
|The G4WIM PA controller
|34
|-
|Turning Back the Pages - a 70 year special!
|39
|-
|ATV at Chalon-sur-Saone fayre
|43
|}

=====Issue 264 Summer 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC stand, Blackpool 2018 & 2019
|8
|-
|BATC Members’ Shop Update
|9
|-
|MCR21 Project Launch
|12
|-
|23 cm QRM
|13
|-
|Protecting Your LimeSDR Mini
|14
|-
|Portsdown Made Simple
|15
|-
|How to use K7FRY’s 10 Character Locator Website
|16
|-
|Dual channel output for the BATC version 2 MiniTiouner PCB
|17
|-
|KITTENS 19 & KITTENS 19 Activity Day
|19
|-
|Goonhilly Spectrum Monitor and WebSDR Maintenance Visit
|21
|-
|Video Fundamentals 18
|22
|-
|BATC at the Kempton Park Rally
|23
|-
|A very cheap easy to make Sync detector for
analogue video
|24
|-
|Well, I tried… 5.8GHz ATV
|25
|-
|Video Production - with a smartphone! Part 1.
|26
|-
|Turning Back the Pages - CQ-TV 76
|28
|-
|MCR21 Recording its History
|31
|-
|BATC at the Newbury Rally 2019
|31
|}

=====Issue 263 Spring 2019=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|OSCAR- 100 has arrived!
|9
|-
|Receiving QO-100
|10
|-
|Transmitting Systems for QO-100 on Es’hail-2
|12
|-
|G8LES Spectrian Amplifier mods for 2.3-2.4GHz
|15
|-
|Portsdown Newsletter
|17
|-
|Bias and reference injection board
|19
|-
|Easy Hole Plating at Home
|21
|-
|New DATV record on 76 GHz
|24
|-
|Bristol Mini-CAT
|24
|-
|MCR21 Progress
|25
|-
|The old and new models of the Octagon Twin LNB
|26
|-
|Route du Rhum
|26
|-
|Cheap Ebay Bias Tee
|27
|-
|Experiments with baseband digital video
|28
|-
|A New Audio Mixer for GB3KM
|32
|-
|BATC Website Incident
|33
|-
|Video Fundamentals 17
|34
|-
|3D Printed horn antennas - Part 2
|35
|-
|Simple dual band dish feed for Es’hail-2 (POTY)
|37
|-
|Turning Back the Pages - CQ-TV 75
|41
|}

=====Issue 262 Winter 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|BATC report to the RSGB Spectrum Forum
|11
|-
|BATC response to WRC Agenda Item 1.1
|12
|-
|The story behind Es’hail-2
|13
|-
|Portsdown Support for the LimeSDR
|15
|-
|Sydney Amateur Television goes 5.6 GHz
|18
|-
|We were there at the launch of Es’Hail-2!
|20
|-
|A 23cm Power Amplifier For Digital ATV
|22
|-
|Portsdown Newsletter
|25
|-
|I bought a 3-D printer
|27
|-
|DVB-S DATV signal power measurement
|29
|-
|Low band DATV
|30
|-
|DATV on 24cms
|31
|-
|Measuring Power on 5.6 GHz & a New Receiver
|33
|-
|Baliu RB-TV in Catalonia
|35
|-
|DATV over optical - Part 2: interfacing the two
|36
|-
|Video Fundamentals 16 - Aspect Ratio re-visited
|40
|-
|Turning Back the Pages - CQ-TV 74
|41
|}

=====Issue 261 Autumn 2018=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Touchscreen control of the DATV Express – part 2
|9
|-
|CAT18 award presentations and prizes
|10
|-
|BATC Test Equipment
|11
|-
|Microwave roundtable construction competition winners
|11
|-
|A Handy Signal Generator for 10GHz
|12
|-
|Es’Hail-2 launching soon!
|14
|-
|The Future of CAT
|15
|-
|ATV Workshop in Shropshire
|16
|-
|Portsdown Newsletter
|17
|-
|DATV over optical – an introduction
|19
|-
|CAT18 Report
|21
|-
|BATC at Goonhilly
|25
|-
|Video Fundamentals 15 - Wire, labelling & MCR21
|26
|-
|Es’hail-2 Wideband Transponder
|28
|-
|BATC members and DATV in Spain
|29
|-
|Getting ready to receive Es’hail-2
|30
|-
|BATC Awards Presentations at CAT18
|33
|-
|Never mind the width - look at the quality
|34
|-
|David Ellis Jones B.Sc, ALCM. GW8PBX (SK)
|35
|-
|Locking the Octagon PLL LNB to an external reference
|36
|-
|Turning Back the Pages - CQ-TV 73
|37
|}

2023 - 2028 CQ-TV 281 to CQ-TV 300

2026-07-14T08:55:49Z

G8GKQ: /* Issue 281 Autumn 2023 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====Issue 287 Spring 2025=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Needs You
|5
|-
|Muntjac SDR – an Update
|8
|-
|A learning curve with a 70cms pallet
|12
|-
|BATC at HAM RADIO 2025 Friedrichshafen
|13
|-
|The Portsdown Newsletter
|14
|-
|Q1-2025 Dx news from the GB3JV TV Repeater
|14
|-
|Bias-Tee: complicated?
|16
|-
|Aerial experiments for DATV
|19
|-
|A Portable DATV System
|21
|-
|8th March 2025 Activity day
|23
|-
|PE43703 Attenuator Controller
|25
|-
|Building a(nother) rotator for /P usage
|28
|-
|High power PSU with current limiting
|30
|-
|Fun and games with an Arduino
|31
|-
|Product review: Banggood Buck-Boost 120W Power supply
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 286 Winter 2024=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Trevor Lumb home built camera
|7
|-
|The Portsdown Newsletter
|8
|-
|Another solution for effective talkback
|10
|-
|BATC at the Midland Microwave Round Table
|11
|-
|BATC at the RSGB Convention
|12
|-
|SRT - How to get started
|14
|-
|Antenna polarization: why horizontal?
|16
|-
|DATV linear transponder on HB9TV-1 relay
|19
|-
|Conversion of 70cms 350 watt power amplifier pallet
|20
|-
|AllStar DATV Talkback
|21
|-
|BATC Subscriptions
|21
|-
|Digital signal path upgrade of GB3EY
|22
|-
|November Activity Weekend and a 71MHz bandpass filter
|26
|-
|5-petal ‘cloverleaf’ antenna for 435MHz
|27
|-
|A QRO filter for 70cms
|28
|-
|JOTA 2024 - from Gilwell Park GB2GP
|28
|-
|Turning Back the Pages
|29
|-
|CAT25 - Save the date!
|31
|}

=====Issue 285 Autumn 2024=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Jamboree on the Air - 2024
|6
|-
|Adding a RTC (real time clock) to a Portsdown 4
|7
|-
|BATC at the Telford Rally
|8
|-
|Conversion of old pallet amplifier to 13cm
|9
|-
|A look back at BATC history and the work of Mike Cox
|10
|-
|PicoTuneWH - Ethernet software for the BATC PicoTuner
|11
|-
|Muntjac - a Pluto alternative for QO-100 DATV
|12
|-
|The Portsdown Newsletter
|16
|-
|My DATV transmitter
|17
|-
|Mr Whippy moves on…
|19
|-
|CAT 24 – a report of Part one
|20
|-
|Presentation of awards at CAT 24
|23
|-
|Antenna element holders made by a 3D printer
|24
|-
|Adalm Pluto PTT Control
|26
|-
|YASS – Yet another signal source
|27
|-
|Turning Back the Pages
|28
|-
|CAT24 Part II
|31
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv284.pdf Issue 284 Summer 2024]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Agenda for the BATC general meeting
|5
|-
|The Portsdown Newsletter
|6
|-
|CQ-TV back issues
|7
|-
|ATEM Update v9.5
|9
|-
|The LimeNET Micro 2.0 developer edition
|10
|-
|A brief adventure with /MM DATV
|11
|-
|The BATC gets shipshape to help celebrate RNLI 200
|12
|-
|Portsdown 5: under development
|14
|-
|What force to tighten a SMA connector?
|15
|-
|Fitting my PA in a case with a fan
|16
|-
|QO100 from VO1 Newfoundland
|17
|-
|A method for remote off-air status monitoring for DATV repeaters
|20
|-
|Mr Whippy serves up another seven-band Sundae
|23
|-
|My Portable Set-up – Dave, G8GKQ
|25
|-
|Modification of Nokia type PA
|27
|-
|Out and about for a contest…
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv283.pdf Issue 283 Spring 2024]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|HamTV update
|6
|-
|The BATC general meeting 2024
|7
|-
|Financial report
|8
|-
|Introducing the PicoTuner
|10
|-
|A new PCB for the PicoTuner
|11
|-
|BATC shop EU warehouse
|12
|-
|Surface mount Pico adaptor for the MiniTiouner V2 PCB
|12
|-
|Going digital with two triple Ryde receivers
|13
|-
|Cheap video cameras with poor colour reproduction
|16
|-
|The Portsdown Newsletter
|17
|-
|Impact of Amp Over-drive on DATV?
|19
|-
|Portable DATV at GX3WIM/P
|20
|-
|Poor man’s bandviewer
|21
|-
|The Portsdown noise meter
|22
|-
|Modifications to the Polycom VTC Table Microphone
|24
|-
|32dB RF attenuator – an alternative solution
|26
|-
|A quick transition for 3.4GHz, or ‘microwaves in a mustard (O.K, coffee) tin’
|27
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv282.pdf Issue 282 Winter 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Out and about in 2023 with the BATC
|6
|-
|CAT 24 - Initial plans
|8
|-
|David Mann - G8ADM, President of the BATC
|9
|-
|The future of the 23cms band – December 2023
|10
|-
|The Portsdown Newsletter
|11
|-
|New SSTV relay in Chatteris, Cambs
|12
|-
|Serit FTS-4334 NIM / tuner - good news at last
|13
|-
|Switched attenuator for QO-100 transmission
|14
|-
|Evaluation of the quality of transmitted and received analogue video signals
|15
|-
|Mid-Cornwall beacon and repeater group goes green
|19
|-
|BATC represented at “The Day of The Radio Amateur” in the Netherlands
|20
|-
|A multiband multimode transceiver
|22
|-
|Amateur television at the Spennymoor radio rally
|25
|-
|Raspberry Pi 5 - First impressions
|26
|-
|Jamboree on the Air 2023 - a tale of two stations
|27
|-
|Using an external clock with the Pluto Rev C/D
|30
|-
|A quick transition for 3.4GHz, or ‘microwaves in a mustard (O.K, coffee) tin’
|31
|-
|Turning Back the Pages
|32
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv281.pdf Issue 281 Autumn 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IC-905 - Icom’s microwave and ATV transceiver
|8
|-
|You can never have enough computer monitors
|11
|-
|An alternative method of generating FM TV at 5.6GHz
|12
|-
|A New Hybrid Television Transmission Systems
|14
|-
|Out and About…
|19
|-
|Small Dishes
|20
|-
|How to point an antenna if you are out portable?
|21
|-
|CAT 23 – a grand day out
|22
|-
|News from Japan 358 km, 5.7GHz, DATV Success
|24
|-
|Modbus controlling of PAs with Arduino boards
|25
|-
|IARU Region 1 ATV contest 2023 results
|29
|-
|The Charon, a HF up-converter for the Adalm Pluto
|31
|-
|Turning Back the Pages
|32
|}

2023 - 2028 CQ-TV 281 to CQ-TV 300

2026-07-14T08:55:30Z

G8GKQ: /* Issue 282 Winter 2023 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====Issue 287 Spring 2025=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Needs You
|5
|-
|Muntjac SDR – an Update
|8
|-
|A learning curve with a 70cms pallet
|12
|-
|BATC at HAM RADIO 2025 Friedrichshafen
|13
|-
|The Portsdown Newsletter
|14
|-
|Q1-2025 Dx news from the GB3JV TV Repeater
|14
|-
|Bias-Tee: complicated?
|16
|-
|Aerial experiments for DATV
|19
|-
|A Portable DATV System
|21
|-
|8th March 2025 Activity day
|23
|-
|PE43703 Attenuator Controller
|25
|-
|Building a(nother) rotator for /P usage
|28
|-
|High power PSU with current limiting
|30
|-
|Fun and games with an Arduino
|31
|-
|Product review: Banggood Buck-Boost 120W Power supply
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 286 Winter 2024=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Trevor Lumb home built camera
|7
|-
|The Portsdown Newsletter
|8
|-
|Another solution for effective talkback
|10
|-
|BATC at the Midland Microwave Round Table
|11
|-
|BATC at the RSGB Convention
|12
|-
|SRT - How to get started
|14
|-
|Antenna polarization: why horizontal?
|16
|-
|DATV linear transponder on HB9TV-1 relay
|19
|-
|Conversion of 70cms 350 watt power amplifier pallet
|20
|-
|AllStar DATV Talkback
|21
|-
|BATC Subscriptions
|21
|-
|Digital signal path upgrade of GB3EY
|22
|-
|November Activity Weekend and a 71MHz bandpass filter
|26
|-
|5-petal ‘cloverleaf’ antenna for 435MHz
|27
|-
|A QRO filter for 70cms
|28
|-
|JOTA 2024 - from Gilwell Park GB2GP
|28
|-
|Turning Back the Pages
|29
|-
|CAT25 - Save the date!
|31
|}

=====Issue 285 Autumn 2024=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Jamboree on the Air - 2024
|6
|-
|Adding a RTC (real time clock) to a Portsdown 4
|7
|-
|BATC at the Telford Rally
|8
|-
|Conversion of old pallet amplifier to 13cm
|9
|-
|A look back at BATC history and the work of Mike Cox
|10
|-
|PicoTuneWH - Ethernet software for the BATC PicoTuner
|11
|-
|Muntjac - a Pluto alternative for QO-100 DATV
|12
|-
|The Portsdown Newsletter
|16
|-
|My DATV transmitter
|17
|-
|Mr Whippy moves on…
|19
|-
|CAT 24 – a report of Part one
|20
|-
|Presentation of awards at CAT 24
|23
|-
|Antenna element holders made by a 3D printer
|24
|-
|Adalm Pluto PTT Control
|26
|-
|YASS – Yet another signal source
|27
|-
|Turning Back the Pages
|28
|-
|CAT24 Part II
|31
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv284.pdf Issue 284 Summer 2024]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Agenda for the BATC general meeting
|5
|-
|The Portsdown Newsletter
|6
|-
|CQ-TV back issues
|7
|-
|ATEM Update v9.5
|9
|-
|The LimeNET Micro 2.0 developer edition
|10
|-
|A brief adventure with /MM DATV
|11
|-
|The BATC gets shipshape to help celebrate RNLI 200
|12
|-
|Portsdown 5: under development
|14
|-
|What force to tighten a SMA connector?
|15
|-
|Fitting my PA in a case with a fan
|16
|-
|QO100 from VO1 Newfoundland
|17
|-
|A method for remote off-air status monitoring for DATV repeaters
|20
|-
|Mr Whippy serves up another seven-band Sundae
|23
|-
|My Portable Set-up – Dave, G8GKQ
|25
|-
|Modification of Nokia type PA
|27
|-
|Out and about for a contest…
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv283.pdf Issue 283 Spring 2024]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|HamTV update
|6
|-
|The BATC general meeting 2024
|7
|-
|Financial report
|8
|-
|Introducing the PicoTuner
|10
|-
|A new PCB for the PicoTuner
|11
|-
|BATC shop EU warehouse
|12
|-
|Surface mount Pico adaptor for the MiniTiouner V2 PCB
|12
|-
|Going digital with two triple Ryde receivers
|13
|-
|Cheap video cameras with poor colour reproduction
|16
|-
|The Portsdown Newsletter
|17
|-
|Impact of Amp Over-drive on DATV?
|19
|-
|Portable DATV at GX3WIM/P
|20
|-
|Poor man’s bandviewer
|21
|-
|The Portsdown noise meter
|22
|-
|Modifications to the Polycom VTC Table Microphone
|24
|-
|32dB RF attenuator – an alternative solution
|26
|-
|A quick transition for 3.4GHz, or ‘microwaves in a mustard (O.K, coffee) tin’
|27
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv282.pdf Issue 282 Winter 2023]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Out and about in 2023 with the BATC
|6
|-
|CAT 24 - Initial plans
|8
|-
|David Mann - G8ADM, President of the BATC
|9
|-
|The future of the 23cms band – December 2023
|10
|-
|The Portsdown Newsletter
|11
|-
|New SSTV relay in Chatteris, Cambs
|12
|-
|Serit FTS-4334 NIM / tuner - good news at last
|13
|-
|Switched attenuator for QO-100 transmission
|14
|-
|Evaluation of the quality of transmitted and received analogue video signals
|15
|-
|Mid-Cornwall beacon and repeater group goes green
|19
|-
|BATC represented at “The Day of The Radio Amateur” in the Netherlands
|20
|-
|A multiband multimode transceiver
|22
|-
|Amateur television at the Spennymoor radio rally
|25
|-
|Raspberry Pi 5 - First impressions
|26
|-
|Jamboree on the Air 2023 - a tale of two stations
|27
|-
|Using an external clock with the Pluto Rev C/D
|30
|-
|A quick transition for 3.4GHz, or ‘microwaves in a mustard (O.K, coffee) tin’
|31
|-
|Turning Back the Pages
|32
|}

=====Issue 281 Autumn 2023=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IC-905 - Icom’s microwave and ATV transceiver
|8
|-
|You can never have enough computer monitors
|11
|-
|An alternative method of generating FM TV at 5.6GHz
|12
|-
|A New Hybrid Television Transmission Systems
|14
|-
|Out and About…
|19
|-
|Small Dishes
|20
|-
|How to point an antenna if you are out portable?
|21
|-
|CAT 23 – a grand day out
|22
|-
|News from Japan 358 km, 5.7GHz, DATV Success
|24
|-
|Modbus controlling of PAs with Arduino boards
|25
|-
|IARU Region 1 ATV contest 2023 results
|29
|-
|The Charon, a HF up-converter for the Adalm Pluto
|31
|-
|Turning Back the Pages
|32
|}

2023 - 2028 CQ-TV 281 to CQ-TV 300

2026-07-14T08:55:08Z

G8GKQ: /* Issue 283 Spring 2024 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====Issue 287 Spring 2025=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Needs You
|5
|-
|Muntjac SDR – an Update
|8
|-
|A learning curve with a 70cms pallet
|12
|-
|BATC at HAM RADIO 2025 Friedrichshafen
|13
|-
|The Portsdown Newsletter
|14
|-
|Q1-2025 Dx news from the GB3JV TV Repeater
|14
|-
|Bias-Tee: complicated?
|16
|-
|Aerial experiments for DATV
|19
|-
|A Portable DATV System
|21
|-
|8th March 2025 Activity day
|23
|-
|PE43703 Attenuator Controller
|25
|-
|Building a(nother) rotator for /P usage
|28
|-
|High power PSU with current limiting
|30
|-
|Fun and games with an Arduino
|31
|-
|Product review: Banggood Buck-Boost 120W Power supply
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 286 Winter 2024=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Trevor Lumb home built camera
|7
|-
|The Portsdown Newsletter
|8
|-
|Another solution for effective talkback
|10
|-
|BATC at the Midland Microwave Round Table
|11
|-
|BATC at the RSGB Convention
|12
|-
|SRT - How to get started
|14
|-
|Antenna polarization: why horizontal?
|16
|-
|DATV linear transponder on HB9TV-1 relay
|19
|-
|Conversion of 70cms 350 watt power amplifier pallet
|20
|-
|AllStar DATV Talkback
|21
|-
|BATC Subscriptions
|21
|-
|Digital signal path upgrade of GB3EY
|22
|-
|November Activity Weekend and a 71MHz bandpass filter
|26
|-
|5-petal ‘cloverleaf’ antenna for 435MHz
|27
|-
|A QRO filter for 70cms
|28
|-
|JOTA 2024 - from Gilwell Park GB2GP
|28
|-
|Turning Back the Pages
|29
|-
|CAT25 - Save the date!
|31
|}

=====Issue 285 Autumn 2024=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Jamboree on the Air - 2024
|6
|-
|Adding a RTC (real time clock) to a Portsdown 4
|7
|-
|BATC at the Telford Rally
|8
|-
|Conversion of old pallet amplifier to 13cm
|9
|-
|A look back at BATC history and the work of Mike Cox
|10
|-
|PicoTuneWH - Ethernet software for the BATC PicoTuner
|11
|-
|Muntjac - a Pluto alternative for QO-100 DATV
|12
|-
|The Portsdown Newsletter
|16
|-
|My DATV transmitter
|17
|-
|Mr Whippy moves on…
|19
|-
|CAT 24 – a report of Part one
|20
|-
|Presentation of awards at CAT 24
|23
|-
|Antenna element holders made by a 3D printer
|24
|-
|Adalm Pluto PTT Control
|26
|-
|YASS – Yet another signal source
|27
|-
|Turning Back the Pages
|28
|-
|CAT24 Part II
|31
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv284.pdf Issue 284 Summer 2024]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Agenda for the BATC general meeting
|5
|-
|The Portsdown Newsletter
|6
|-
|CQ-TV back issues
|7
|-
|ATEM Update v9.5
|9
|-
|The LimeNET Micro 2.0 developer edition
|10
|-
|A brief adventure with /MM DATV
|11
|-
|The BATC gets shipshape to help celebrate RNLI 200
|12
|-
|Portsdown 5: under development
|14
|-
|What force to tighten a SMA connector?
|15
|-
|Fitting my PA in a case with a fan
|16
|-
|QO100 from VO1 Newfoundland
|17
|-
|A method for remote off-air status monitoring for DATV repeaters
|20
|-
|Mr Whippy serves up another seven-band Sundae
|23
|-
|My Portable Set-up – Dave, G8GKQ
|25
|-
|Modification of Nokia type PA
|27
|-
|Out and about for a contest…
|28
|-
|Turning Back the Pages
|29
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv283.pdf Issue 283 Spring 2024]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|HamTV update
|6
|-
|The BATC general meeting 2024
|7
|-
|Financial report
|8
|-
|Introducing the PicoTuner
|10
|-
|A new PCB for the PicoTuner
|11
|-
|BATC shop EU warehouse
|12
|-
|Surface mount Pico adaptor for the MiniTiouner V2 PCB
|12
|-
|Going digital with two triple Ryde receivers
|13
|-
|Cheap video cameras with poor colour reproduction
|16
|-
|The Portsdown Newsletter
|17
|-
|Impact of Amp Over-drive on DATV?
|19
|-
|Portable DATV at GX3WIM/P
|20
|-
|Poor man’s bandviewer
|21
|-
|The Portsdown noise meter
|22
|-
|Modifications to the Polycom VTC Table Microphone
|24
|-
|32dB RF attenuator – an alternative solution
|26
|-
|A quick transition for 3.4GHz, or ‘microwaves in a mustard (O.K, coffee) tin’
|27
|-
|Turning Back the Pages
|29
|}

=====Issue 282 Winter 2023=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Out and about in 2023 with the BATC
|6
|-
|CAT 24 - Initial plans
|8
|-
|David Mann - G8ADM, President of the BATC
|9
|-
|The future of the 23cms band – December 2023
|10
|-
|The Portsdown Newsletter
|11
|-
|New SSTV relay in Chatteris, Cambs
|12
|-
|Serit FTS-4334 NIM / tuner - good news at last
|13
|-
|Switched attenuator for QO-100 transmission
|14
|-
|Evaluation of the quality of transmitted and received analogue video signals
|15
|-
|Mid-Cornwall beacon and repeater group goes green
|19
|-
|BATC represented at “The Day of The Radio Amateur” in the Netherlands
|20
|-
|A multiband multimode transceiver
|22
|-
|Amateur television at the Spennymoor radio rally
|25
|-
|Raspberry Pi 5 - First impressions
|26
|-
|Jamboree on the Air 2023 - a tale of two stations
|27
|-
|Using an external clock with the Pluto Rev C/D
|30
|-
|A quick transition for 3.4GHz, or ‘microwaves in a mustard (O.K, coffee) tin’
|31
|-
|Turning Back the Pages
|32
|}

=====Issue 281 Autumn 2023=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IC-905 - Icom’s microwave and ATV transceiver
|8
|-
|You can never have enough computer monitors
|11
|-
|An alternative method of generating FM TV at 5.6GHz
|12
|-
|A New Hybrid Television Transmission Systems
|14
|-
|Out and About…
|19
|-
|Small Dishes
|20
|-
|How to point an antenna if you are out portable?
|21
|-
|CAT 23 – a grand day out
|22
|-
|News from Japan 358 km, 5.7GHz, DATV Success
|24
|-
|Modbus controlling of PAs with Arduino boards
|25
|-
|IARU Region 1 ATV contest 2023 results
|29
|-
|The Charon, a HF up-converter for the Adalm Pluto
|31
|-
|Turning Back the Pages
|32
|}

2023 - 2028 CQ-TV 281 to CQ-TV 300

2026-07-14T08:54:31Z

G8GKQ: /* Issue 284 Summer 2024 */

Copies of CQ-TV more than 2 years old are free to download at https://batc.org.uk/cq-tv/cq-tv-archive/

=====Issue 287 Spring 2025=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|The BATC Needs You
|5
|-
|Muntjac SDR – an Update
|8
|-
|A learning curve with a 70cms pallet
|12
|-
|BATC at HAM RADIO 2025 Friedrichshafen
|13
|-
|The Portsdown Newsletter
|14
|-
|Q1-2025 Dx news from the GB3JV TV Repeater
|14
|-
|Bias-Tee: complicated?
|16
|-
|Aerial experiments for DATV
|19
|-
|A Portable DATV System
|21
|-
|8th March 2025 Activity day
|23
|-
|PE43703 Attenuator Controller
|25
|-
|Building a(nother) rotator for /P usage
|28
|-
|High power PSU with current limiting
|30
|-
|Fun and games with an Arduino
|31
|-
|Product review: Banggood Buck-Boost 120W Power supply
|32
|-
|Turning Back the Pages
|33
|}

=====Issue 286 Winter 2024=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Trevor Lumb home built camera
|7
|-
|The Portsdown Newsletter
|8
|-
|Another solution for effective talkback
|10
|-
|BATC at the Midland Microwave Round Table
|11
|-
|BATC at the RSGB Convention
|12
|-
|SRT - How to get started
|14
|-
|Antenna polarization: why horizontal?
|16
|-
|DATV linear transponder on HB9TV-1 relay
|19
|-
|Conversion of 70cms 350 watt power amplifier pallet
|20
|-
|AllStar DATV Talkback
|21
|-
|BATC Subscriptions
|21
|-
|Digital signal path upgrade of GB3EY
|22
|-
|November Activity Weekend and a 71MHz bandpass filter
|26
|-
|5-petal ‘cloverleaf’ antenna for 435MHz
|27
|-
|A QRO filter for 70cms
|28
|-
|JOTA 2024 - from Gilwell Park GB2GP
|28
|-
|Turning Back the Pages
|29
|-
|CAT25 - Save the date!
|31
|}

=====Issue 285 Autumn 2024=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Jamboree on the Air - 2024
|6
|-
|Adding a RTC (real time clock) to a Portsdown 4
|7
|-
|BATC at the Telford Rally
|8
|-
|Conversion of old pallet amplifier to 13cm
|9
|-
|A look back at BATC history and the work of Mike Cox
|10
|-
|PicoTuneWH - Ethernet software for the BATC PicoTuner
|11
|-
|Muntjac - a Pluto alternative for QO-100 DATV
|12
|-
|The Portsdown Newsletter
|16
|-
|My DATV transmitter
|17
|-
|Mr Whippy moves on…
|19
|-
|CAT 24 – a report of Part one
|20
|-
|Presentation of awards at CAT 24
|23
|-
|Antenna element holders made by a 3D printer
|24
|-
|Adalm Pluto PTT Control
|26
|-
|YASS – Yet another signal source
|27
|-
|Turning Back the Pages
|28
|-
|CAT24 Part II
|31
|}

=====[https://batc.org.uk/wp-content/uploads/cq-tv284.pdf Issue 284 Summer 2024]=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Agenda for the BATC general meeting
|5
|-
|The Portsdown Newsletter
|6
|-
|CQ-TV back issues
|7
|-
|ATEM Update v9.5
|9
|-
|The LimeNET Micro 2.0 developer edition
|10
|-
|A brief adventure with /MM DATV
|11
|-
|The BATC gets shipshape to help celebrate RNLI 200
|12
|-
|Portsdown 5: under development
|14
|-
|What force to tighten a SMA connector?
|15
|-
|Fitting my PA in a case with a fan
|16
|-
|QO100 from VO1 Newfoundland
|17
|-
|A method for remote off-air status monitoring for DATV repeaters
|20
|-
|Mr Whippy serves up another seven-band Sundae
|23
|-
|My Portable Set-up – Dave, G8GKQ
|25
|-
|Modification of Nokia type PA
|27
|-
|Out and about for a contest…
|28
|-
|Turning Back the Pages
|29
|}

=====Issue 283 Spring 2024=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|HamTV update
|6
|-
|The BATC general meeting 2024
|7
|-
|Financial report
|8
|-
|Introducing the PicoTuner
|10
|-
|A new PCB for the PicoTuner
|11
|-
|BATC shop EU warehouse
|12
|-
|Surface mount Pico adaptor for the MiniTiouner V2 PCB
|12
|-
|Going digital with two triple Ryde receivers
|13
|-
|Cheap video cameras with poor colour reproduction
|16
|-
|The Portsdown Newsletter
|17
|-
|Impact of Amp Over-drive on DATV?
|19
|-
|Portable DATV at GX3WIM/P
|20
|-
|Poor man’s bandviewer
|21
|-
|The Portsdown noise meter
|22
|-
|Modifications to the Polycom VTC Table Microphone
|24
|-
|32dB RF attenuator – an alternative solution
|26
|-
|A quick transition for 3.4GHz, or ‘microwaves in a mustard (O.K, coffee) tin’
|27
|-
|Turning Back the Pages
|29
|}

=====Issue 282 Winter 2023=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|Out and about in 2023 with the BATC
|6
|-
|CAT 24 - Initial plans
|8
|-
|David Mann - G8ADM, President of the BATC
|9
|-
|The future of the 23cms band – December 2023
|10
|-
|The Portsdown Newsletter
|11
|-
|New SSTV relay in Chatteris, Cambs
|12
|-
|Serit FTS-4334 NIM / tuner - good news at last
|13
|-
|Switched attenuator for QO-100 transmission
|14
|-
|Evaluation of the quality of transmitted and received analogue video signals
|15
|-
|Mid-Cornwall beacon and repeater group goes green
|19
|-
|BATC represented at “The Day of The Radio Amateur” in the Netherlands
|20
|-
|A multiband multimode transceiver
|22
|-
|Amateur television at the Spennymoor radio rally
|25
|-
|Raspberry Pi 5 - First impressions
|26
|-
|Jamboree on the Air 2023 - a tale of two stations
|27
|-
|Using an external clock with the Pluto Rev C/D
|30
|-
|A quick transition for 3.4GHz, or ‘microwaves in a mustard (O.K, coffee) tin’
|31
|-
|Turning Back the Pages
|32
|}

=====Issue 281 Autumn 2023=====
{| class="wikitable" ;"
! style="width:400px; text-align:left;"|Article
! style="text-align:left;"|Page
|-
|IC-905 - Icom’s microwave and ATV transceiver
|8
|-
|You can never have enough computer monitors
|11
|-
|An alternative method of generating FM TV at 5.6GHz
|12
|-
|A New Hybrid Television Transmission Systems
|14
|-
|Out and About…
|19
|-
|Small Dishes
|20
|-
|How to point an antenna if you are out portable?
|21
|-
|CAT 23 – a grand day out
|22
|-
|News from Japan 358 km, 5.7GHz, DATV Success
|24
|-
|Modbus controlling of PAs with Arduino boards
|25
|-
|IARU Region 1 ATV contest 2023 results
|29
|-
|The Charon, a HF up-converter for the Adalm Pluto
|31
|-
|Turning Back the Pages
|32
|}

SUP2400 mods

2026-05-17T18:52:23Z

G8GKQ:

In order to receive 437 MHz (70cms) DATV on a standard satellite STB or early MiniTiouners with Sharp or Eardtek tuners, you need to up convert the signal to L band. Current, version 2, MiniTiouners or PicoTuners using the Serit FTS-4334 (or FTS-4335) tuner cover from 144 MHz to 2450 MHz, so no up-conversion is required.

For up-conversion (only required for standard Satellite STBs or very old version 1 MiniTiouners) there is a consumer device available in the USA which is used on cable networks to up convert UHF signals to L Band where they are then received on a standard satellite box.

However, before use on 70cms, they either require hardware modification as described in CQ-TV 239 or the use of the Diseqc controller as described in CQ-TV 250.

* [[SUP2400 DiSEqC| This page on the wiki describes the Disecq controller]]

* [[:Media:Zinwell 70cms DATV up converter CQTV v2.pdf|Details of the hardware modifications are available here.]]

SUP2400 mods

2026-05-17T18:51:58Z

G8GKQ:

In order to receive 437 MHz (70cms) DATV on a standard satellite STB or early MiniTiouners with Sharp or Eardtek tuners, you need to up convert the signal to L band. Current, version 2, MiniTiouners or PicoTuners using the Serit FTS-4334 (or FTS-4335) tuner cover from 144 MHz to 2450 MHz, so no up-conversion is required.

For up-conversion (only for standard Satellite STBs or very old version 1 MiniTiouners) there is a consumer device available in the USA which is used on cable networks to up convert UHF signals to L Band where they are then received on a standard satellite box.

However, before use on 70cms, they either require hardware modification as described in CQ-TV 239 or the use of the Diseqc controller as described in CQ-TV 250.

* [[SUP2400 DiSEqC| This page on the wiki describes the Disecq controller]]

* [[:Media:Zinwell 70cms DATV up converter CQTV v2.pdf|Details of the hardware modifications are available here.]]

The Muntjac SDR

2026-05-14T19:52:25Z

G8GKQ: /* Problems */

The Muntjac SDR was designed by Brian G4EWJ based on the same dual-band AT86RF215 RF chip as the commercially available CaribouLite SDR.

It is a transmit-only SDR for DVB-S2 DATV on 13cm (QO-100) and 70cm, which uses an RP2040 micro-controller, as used on the Raspberry Pi Pico, to provide a USB interface to the Portsdown 4.

When operating from the command line, the same transmission may be made on both bands simultaneously.

The 75 x 30mm board comes without SMA connectors, so that it can optionally be wired into a system, for maximum flexibility. Long thread SMA types are recommended.

The optional user-fitted ADE-30+ mixer is shown, which can be used for experiments on other bands. DATV is generated on the high band and mixed with the harmonic of a carrier on the low band. In theory, output on all bands from 1.8MHz to 3.4GHz is possible, but this is subject to further investigation.

The flash chip has a capacity of 16M bytes, the maximum value for the RP2040 microcontroller. This gives plenty of room for software expansion and perhaps storing of transport streams to use as a beacon.

Muntjac-4 was meant to be intermediate development version, but it is working well enough to make it available as part of an extended beta trial. Some configuration in Linux may be necessary, so if you don't consider yourself to be an 'early-adopter' it may be worth waiting until it has matured.

Please put any comments, questions or problems on the BATC Muntjac forum: '''https://forum.batc.org.uk/viewforum.php?f=148'''

'''The latest version of the Muntjac firmware is 1v0p. Please check your version on the Portsdown INFO screen.'''

''' The ADE-30+ mixer is out of stock at DigiKey and low stock at Mouser, with lead times of August / September.'''

[[File:cqtvmj25-1a.jpg|400px]] [[File:cqtvmj25-2a.jpg|400px]]

 
 

===Specifications===

The Muntjac SDR only operates with output frequencies in the following ranges: 390 - 510 MHz, 779- 1020 MHz and 2400 - 2483 MHz. Individual examples may operate slightly outside these frequency ranges, but not significantly. For our use, this means that the Muntjac can only be used directly on 70 cm and the QO-100 uplink. Clearly, with external transverters it could be used on any band.

When used with the Portsdown 4, the Muntjac will transmit DVB-S2 QPSK with symbol rates of 125, 250, 333.333, 500 and 1000 kS. It will also transmit DVB-S2 8PSK with symbol rates of 125, 250, 333.333 and 500 kS. DVB-S is not supported.

Transmit data is sent to the AT chip at 128M bits/s on an LVDS bus. This is 4M x 13bit IQ samples/s, with 4 times oversampling, which limits the symbol rate to 1000k symbols/s.

The output power setting parameter (gain) range of the AT86RF215 is 0-31, with each step being nominally 1dB and power zero being -15dBm.

When selecting power on the Portsdown screen, this parameter is restricted to a maximum of 20, as the shoulders on the output increase rapidly above this.

At power setting 20, shoulders on the output are at least 30dB down and are further down at lower output powers. Approximate output power is shown in the table below.

{| class="wikitable"
|+ Muntjac Performance
|-
! Gain Setting !! 437 MHz O/P !! 437 MHz Shoulders !! 2409 MHz O/P !! 2409 MHz Shoulders
|-
| 20 || +5.6 dBm || -34 dB || +4.1 dBm || -30 dB
|-
| 19 || +4.8 dBm || || +3.7 dBm ||
|-
| 18 || +4.0 dBm || || +2.8 dBm ||
|-
| 17 || +3.0 dBm || || +2.1 dBm ||
|-
| 16 || +2.1 dBm || || +1.2 dBm ||
|-
| 15 || +0.8 dBm || -40 dB || +0.5 dBm || -40 dB
|-
| 14 || +0.1 dBm || || -0.5 dBm ||
|-
| 13 || -0.9 dBm || || -1.4 dBm ||
|-
| 12 || -1.9 dBm || || -2.5 dBm ||
|-
| 11 || -2.6 dBm || || -3.3 dBm ||
|-
| 10 || -3.6 dBm || -50 dB || -4.4 dBm || -43 dB
|-
| 9 || -4.7 dBm || || -5.3 dBm ||
|-
| 8 || -5.7 dBm || || -6.3 dBm ||
|-
| 7 || -6.4 dBm || || -7.3 dBm ||
|-
| 6 || -7.4 dBm || || -8.3 dBm ||
|-
| 5 || -8.4 dBm || < -50 dB || -9.3 dBm || < -45 dB
|-
| 4 || -9.4 dBm || || -10.3 dBm ||
|-
| 3 || -10.2 dBm || || -11.1 dBm ||
|-
| 2 || -11.2 dBm || || -12.1 dBm ||
|-
| 1 || -12.2 dBm || || -13.1 dBm ||
|-
| 0 || -13.2 dBm || < -50 dB || -14.1 dBm || < -45 dB
|}

The output power at 900 MHz is typically 3 dB less than that at 437 MHz.

===Preparing for Use===

The Muntjac is supplied as a kit with the final assembly step of soldering the output connectors to the PCB required for completion. The SMA connectors are not supplied. If the SDR is to be mounted in a box (it does fit a small die-cast box) right-angle SMAs with long shafts should be used to allow sufficient clearance between the SMA plug and the box. An suitable example connector is this:
https://www.mouser.co.uk/ProductDetail/TE-Connectivity-Linx-Technologies/CONSMA002-L-G?qs=vLWxofP3U2xfxfFnu8BdmA%3D%3D

[[File:SMA Connector.png|200px]]

Cheaper suitable connectors are available on eBay.

An example of the Muntjac mounted in a box (with short SMA Conectors) is shown here.

[[File:Muntjac boxed.jpg|400px]]

===Another Boxing Idea===

As Muntjac-4 was meant to be an intermediate development version, not much thought was given to fitting it into a box.

The Hammond 1550P can be used by cutting slots into the top edges of the box and dropping in the Muntjac-4 board vertically.

The 1550P is about £6 in bare metal and about double that as the 1550PBK with a black finish.

[[File:Mj1550p.png|400px]]
 

===Using Muntjac with the Portsdown 4===

The Muntjac connects to the Portsdown by USB. No other power supply is required. The Muntjac drivers are included in the latest Portsdown 4 software, so make sure that your Portsdown is up to date using Menu 3 and 'Check for Update'. If the Muntjac is connected to the Portsdown, disconnect it before updating.

The first time you use each Muntjac device, it needs to be registered so that the Raspberry Pi recognises it at the next reboot. After connecting a "new" Muntjac to your Portsdown 4, select "Output to" and then "Muntjac". If "Output to" is already set to "Muntjac", select "Output to" and then "Muntjac" again. A message will pop up saying "System will reboot now to register new Muntjac. Touch screen to continue". Touch the screen, and after the reboot, your Muntjac is ready for use. This procedure also copies any published calibration file (see below) to the correct folder for use

You will not need to repeat this process unless you connect a different Muntjac, or you use a different Portsdown.

Next, set the Muntjac gain with reference to the table above. Then connect the correct output to your transmit amplifier; the low band output is used for 437 MHz (and 900 MHz) and the high band output is used for 2400 MHz. The high band output is to the north of the "Muntjac-4" legend.

Within the limitations above, the Muntjac behaves similarly to a LimeSDR Mini.

===LEDs===

There is a main LED near the buttons and an LED near each SMA socket.

The main LED blinks 'HI' in morse (.... ..) at power up. This is for firmware version 1v0b. Later versions will blink 'MJ' and the last letter of the firmware version. After a few seconds for initialisation, the main LED will light steady.

The LED near each SMA socket is normally off and lights when that band (low or high) is in use.

The main LED is normally on and blinks off 1 / 2 / 3 times depending on whether low / high / both bands are active.

If the main LED blinks quickly and continuously, this indicates a Muntjac error and it is waiting for the USB data feed from the Portsdown to be stopped.

The main LED output is also available on the 12 pin J4 socket position, for mounting on a box. Pin 11 is ground and pin 12 is for the +ve end of an LED, through a suitable resistor.

Pin 1 of J4 is the square pad and odd numbered pins are along the edge of the board.

===First Transmission===

If you're not familiar with the Portsdown, set the lines starting 'Modulation', 'Freq' and 'EasyCap' as shown and enter your callsign via 'Menu 3' and 'Set Call, Loc & PIDs'. Adjust the frequency as required.

[[File:Pdmainscreen1.png|400px]]

Press 'TX' and after a second or two, the Muntjac main LED near the buttons will start double blinking off and the LED near the high band SMA will light steady.

===Monitoring Muntjac Driver Operation===

The Muntjac driver (muntjacsdr_dvb) on the Portsdown outputs a log to a UDP network port. To see this, log into the Portsdown with ssh and type:

nc -kluv 9979

The status is updated every second and should look something like this:

======================================
muntjacsdr_dvb-1v0m Portsdown driver version.
muntjac4_pico-1v0p Muntjac firmware version.
In: videots The driver transport stream input device.
Out: /dev/ttyMJ0 The Muntjac device name.
-------------------
FR:2486.500 PWR:3 S:333 FEC:2/3 C:4 Main frequency and parameters.
FR:780.000 PWR:26 Carrier This line appears when mixing.
FT:146.500 The target frequency.
--------------------------------------
Packets Frames Panic Nulls MJ Panic frames are inserted to prevent
In Out Frames SR333 Errors the Muntjac from running out of data.
-------------------------------------- Nulls SR333 are inserted to maintain
4753 176 11 4 0 an output of 333333kS from an input of
====================================== 333000.

MJ0: [Muntjac4-1v0p:E46164855B404B30 (BUFFER_LOW:2046)]

You may occasionally see a BUFFER_LOW message from the Muntjac. Some of the input modes
are not completely constant bit rate in the short term, especially the testcard and
contest numbers. A panic frame containing a few null packets is sent to the Muntjac to
stop the receiver from losing lock.

===Lack of Calibration Spikes===

The AT86RF215 chip does a self calibration before transmitting, but it does this with its final amplifier turned off, so it is not necessary to isolate the output for a number of seconds as with the Pluto and Lime. This is the observation so far, but it's early days for the project, so verify this for yourself.

===IQ Calibration===

Poor IQ balance in an SDR can cause a carrier (the local oscillator) to be transmitted at the centre frequency of a DATV transmission. This causes a reduction in received MER. The reduction is most noticeable at high MER, but it will not affect reception, because the MER is already high. It seems to have less effect when the MER is comparatively low, as on QO-100. It just looks wrong to see a spike in the middle of your signal.

The AT86RF215 chip does an IQ balance as part of its self calibration before transmitting, but it doesn't always do the best job. Fortunately there are registers in the chip which can be adjusted to improve the local oscillator suppression. The required register values vary with the power setting, although not very much within each group of four power settings, so calibration values are only required for power settings 0, 4, 8, 12, 16, 20, 24, 28.

Some Muntjacs may have been calibrated before sale. The calibration files for these are included in the latest Portsdown software, and the correct file is loaded when the Muntjac is registered using the procedure above. However, some may not have been factory calibrated (although they will have been tested). They will function perfectly well for DATV without this file. A tool is under development to enable the Muntjac calibration file to be generated by the user.

The Muntjac calibration file has a file name of the format E46214B063533828.mjo where the E number is the serial number of the flash memory chip on the Muntjac. A file of the correct format with the correct name in the /home/pi/rpidatv/bin/ folder is automatically read by the Muntjac driver and the settings applied. The library of files is in the folder /home/pi/rpidatv/src/muntjac. If you would like your calibration file added to this library, please e-mail it to G8GKQ. An example file can be found at https://github.com/davecrump/portsdown4/blob/master/src/muntjac/E46214B063533828.mjo.

===Output Filtering===

The low band output must be bandpass filtered.

The high band output uses a combined bandpass and notch filter balun, specially designed for the AT86RF215, so additional filtering should not be necessary.

If the low band output is also active, additional filtering on the high band output may be required, to address any feedthrough from the low band output and its harmonics.

https://www.johansontechnology.com/docs/796/2450FB15A050_VdAqien.pdf

===Frequency Accuracy===

The AT86RF215 uses an externally connected 26MHz TXCO on the pcb, with a temperature stability of 0.5ppm and initial accuracy of +/- 2ppm. The 2.4GHz output should be within a few kHz of nominal.

https://aker-usa.com/spec/TX21.pdf

===Shoulders at Various Power Settings===

The plots below show the effect of the power setting on the level of the shoulders at SR333. Shoulders are generally lower on 437MHz for the same power setting. 
When using 8PSK, the requested power level is increased by 2, to maintain the same output power as for QPSK

[[File:Snap80a.jpg|400px]] [[File:Snap76b.jpg|400px]]

[[File:Snap75c.jpg|400px]] [[File:Snap77d.jpg|400px]]

The rising levels at the edges of the plots are an artefact of the Pluto band viewer, as shown by the PWR8 plot in a 10MHz bandwidth.

[[File:Snap78e.jpg|400px]]
 

===Programming the Muntjac Microcontroller===

Muntjacs are provided pre-programmed by the BATC Shop, but this is the procedure to load a firmware update if required.

1. Download the latest compiled firmware in this zip file onto the PC desktop and unzip it: '''[[Media:muntjac4_pico-1v0p-uf2.zip|muntjac4_pico-1v0p-uf2.zip]]'''

The unzipping program may put the wanted file '''muntjac4_pico-1v0p.uf2''' into a folder called '''muntjac4_pico-1v0p-uf2''' on the desktop.

2. Hold down the BT button (the one nearer to the SMA sockets) on the Muntjac while connecting it to your PC using its USB port.
 
or
 
Plug the Muntjac into the PC and on the Muntjac, hold down the BT button while pressing and releasing the RS button.

The main LED on the Muntjac will stay unlit when in firmware update mode.

3. The Muntjac should now appear as a new drive connected to the PC. Your drive letter may be different. The drive name will be RPI-RP2 and there will be 2 files in it: INDEX.HTM and INFO_UF2.TXT

[[File:Muntjac-virtual-drive2.png|800px]]

Drag the '''muntjac4_pico-1v0p.uf2''' file that you unzipped in step 1 above (not the zip file itself, or the folder it was unzipped into), to the RPI-RP2 drive. The transfer should take about 5 seconds.

The RPI-RP2 drive will then disappear and the Muntjac will restart itself.

On the Muntjac, the main LED near the buttons will blink 'MJ' plus the last letter of the new firmware version. The LED will go out for a few seconds while the Muntjac is initialising and then light steady.

The PC may bing-bong, as the Muntjac has now turned back into a COM port, but this can be ignored.

4. Disconnect the Muntjac from the PC and connect it to the Portsdown. Wait until the main LED on the Muntjac is lit and steady.

Make sure that "Output to" on the Portsdown main menu is set to "Muntjac". If this is the first time that this Muntjac has been connected to this Portsdown, while the Muntjac is connected to the Portsdown, change "Output to" to something other than "Muntjac" and then back to "Muntjac". The Portsdown will recognise a new Muntjac and the Portsdown will reboot itself as part of the Muntjac registration process.

When the Portsdown has rebooted and the main LED on the Muntjac is lit and steady, on the Portsdown select "M2" and "Info" and the Muntjac firmware version and serial number will be displayed as shown below.

[[File:Portsdown-info-screen2.png|800px]]
 

===Alternative Method of Putting the Microcontroller into Firmware Update Mode===

This may be useful if you've built the Muntjac into a box and cannot easily get to its buttons.

1. Plug the Muntjac into a PC and it will appear as a COM port. Note that this may not work through a USB3 hub.

2. Find the COM port number in device manager and open a serial terminal session to that COM port at 1200 baud, with a terminal program such as putty.

3. The COM port will instantly disappear and the Muntjac will then appear as a USB drive.

4. Proceed with step 3 in the section above.

Note that this depends on the firmware already in the Muntjac being configured to do this by the SDK (software development kit). This approach would not work on a blank Raspberry Pi Pico board, which uses the same RP2040 microcontroller as the Muntjac.

[[File:MJputty1.png|400px]]

===Updating the Muntjac Firmware Using a Portsdown===

If the Muntjac is built into a Portsdown system, it may not be possible to access its USB socket. A procedure is being developed to help with this.

===Mixing Options===

As both high and low band outputs may be active at the same time, this gives some options for using a mixer to transvert to other bands.

The same DATV transmission can be made simultaneously on both bands (but NOT from a Portsdown menu), but either band can output a carrier instead and the third harmonic of the low band output can be used to mix the high band output to various frequencies.

These notes are to guide experimentation. Some of the high band frequencies are outside the published specification of the AT86RF215 chip (2400-2483.5MHz). The output must be monitored for quality, stability and frequency accuracy.

Any mixer output MUST be bandpass filtered for the required output frequency. This is particularly important for 23cm, where on 1270MHz for example, the required third harmonic of the low band carrier may be only 58MHz away from the target frequency.

The low band carrier power is set at 26, which is nominally +11dBm. If a passive mixer is used, a Level7 (7dBm local oscillator) mixer is recommended. A suitable mixer is a MiniCircuits ADE-30+ (NOT the ADE-30W+, although that may be more suitable depending on your requirements). Mixers in the ADE series can look the same, but have different footprints, so do check carefully that any other mixer is compartible with the pcb. https://www.minicircuits.com/pdfs/ADE-30+.pdf

The high and low band outputs are connected to the RF and LO ports of the mixer, which are specced at 200-3000MHz and the output is taken from the IF port, which is specced at 0-1000MHz. The output is likely to be in the range of the tens of microwatts. The 23cm band is outside the IF range, but still produces a usable output.

The following frequency ranges are built into the Muntjac driver in the Portsdown. Putting the target frequency into Portsdown will automatically select the correct high and low band frequencies for mixing.

{| class="wikitable"
|+ Mixing Options
|-
! Target !! Low !! Harmonic !! High
|-
| 3400-3410 || 1010 || - || 2390-2400
|-
| 1300-1305 || 395 || 1185 || 2395-2400
|-
| 1270-1280 || 404 || 1212 || 2482-2492
|-
| 1244-1250 || 390 || 1170 || 2414-2420
|-
| 144-147 || 780 || 2340 || 2484-2487
|-
| 70.5-71.5 || 805 || 2415 || 2485.5-2486.5
|-
| 50-54 || 812 || 2436 || 2486-2490
|-
| 28-30 || 819 || 2457 || 2483-2485
|}

 

===Fitting and Connecting the Onboard Mixer===

[[File:Mjmixer1a.png|400px|thumb|left]]

Fit the MX101 mixer here, with its pin 1 dot marker close to the thick bar at the south-east of the pcb legend.

An ADE-30+ has been used for testing. Other mixers may look the same, but may have different pinouts.

The mixer inputs are connected to the high and low band outputs of the AT86RF215 by bridging the pairs of rectangular pads shown in the red circles. There is no way to disconnect the SMA outputs.

The green arrow shows the C101 mixer output capacitor, which if factory fitted, will be 100pF 0603. This may be too low, depending on where you're mixing to.

The blue arrow shows the round pad for the centre of an output coax lead. Use the nearby SMA ground pin for the outer.

 

===Using the Third Harmonic of the Low Band for DATV on 23cm===

The third harmonic of 418.333 MHz can be used to transmit on 1255 MHz. The third harmonic is about 20 dB down on the fundamental, so good filtering is required. More details will appear here.

[[File:Third Harmonic.jpg|400px]]

''The fundamental at 418.3 MHz on the left with the 3rd harmonic on 1255 MHz on the right''

===Command Line Operation===

This gives full control over frequency and power on both high and low band simultaneously and enables Portsdown band viewer to be run at the same time.

Details will appear here.

===Muntjac Schematic===

Downloadable PDF files will be available shortly.

[[File:Image 2026-04-28 12-58-03.png|1080px]]

===Muntjac Input/Output Connectors===

The 40 pin J101 position will enable the Muntjac to connect directly to a Raspberry Pi. This will provide power and also an SPI connection instead of USB, allowing higher data rates for future development. It is recommended that no connector is fitted here until the required orientation and gender is known.

The 8 pin J3 position can be used for general I/O or to allow future developments to connect a WIZnet Ethernet module for applications that do not require a Raspberry Pi.

The 12 pin J4 position is for general I/O.

3.3v power is available on J3 and J4. The available current is yet to be determined, but likely to be around 100mA.

All Muntjac I/O pins on J3 and J4 are connected directly to the RP2040 microcontroller, so caution should be exercised regarding static and voltage levels. 3.3v is the nominal voltage level.

There are no pins on J3 or J4 that connect to J101.

===Problems===

The Muntjac may not be seen as a USB COM port when connected to a some USB hubs. The USB3 sockets on the RPi4 are not a problem. However, it will appear as a virtual USB drive for firmware update when connected to a USB3 hub, which is odd.

Repeater Controller configuration

2026-05-11T19:24:47Z

G8GKQ: /* TX key and Power Saving logic - also in SSH menu (see above for description) */

Back to [[Repeater Controller|repeater controller]] main page

This page describes the setup of the BATC repeater controller - it should only be attempted by advanced users.

'''Note not all functions listed in the config file are currently implemented.
'''
=SSH Menu=

Some configuration and some real-time control is possible using the ssh Console Menu.

To enter the repeater controller menu log in to the RPi by SSH using a program such as Putty and type menu.

[[File:controller main.JPG|600px]]

===Reload===

Loads the configuration changes you have made and restarts the controller

===1 Behaviour===

1 - Audio keepalive. Some HDMI switches permanently shut down the audio channel is no audio is present. This option puts low-level white noise on the controller audio out to prevent this from happening.

2 - Transmit enable. Enables transmit key line on pin xx

3 - Beacon mode. Enables the controller to just run in beacon mode and ignore all inputs.

4 - Power save. Enables transmit key line to be on continuously or just when the controller sees a valid input signal or when sending an ident.

5 - Operating hours. Selection of transmit key line to be active continuously or just during a timed period to save power. If timed, select the start and stop times. Note time is set using UTC time, not local time.

6 - Quiet hours repeat. If Timed operation was selected in menu 5, you can set if the repeater should repeat an input signal during the quiet time.

7 - Quiet hours ident. If Timed operation was selected in menu 5, you can set if the repeater should send the ident signal during the quiet time.

8 - Half hour. If enabled, the transmitter will only be keyed in beacon mode during the first 30 minutes of every hour and not during the 2nd half hour to save power.

9 - Quad auto enable. Enables the quad display to be automatically displayed when more than 1 selected inputs are present.

10 - Enable DTMF input. Enables over air DTMF control of the repeater

11 - Apply changes

12 - Return to main menu

===2 Callsign===

Entry of the repeater callsign and QRA locator for display on generated captions.

===3 Inputs===

1 - 7 Input. Enables priority of each input to be set

8 - Input count. Set this to the total number of inputs on the video switcher - Do NOT include the controller in this number.

9 - Active Hold. Determines if a higher priority input will override the currently selected input.

10 - Apply

11 - Main Menu

===4 Control===

Enables direct selection of any input source

===5 Update===
Check s/w version and update if needed.

===6 Settings===

1 - Reset factory defaults

2 - Check HDMI. Lists the HDMI settings for fault finding

3 - Main menu.

===7 Diagnostics===

===8 Reboot===

Does exactly that!

=Controlling the Repeater During Testing=

===Stopping the Controller===

The controller can be stopped by entering
stop
at the command line. This tells all the repeater processes to stop and should show a "Controller Software Not Running" caption on the HDMI output.

===Restarting the Controller for Testing===

You can restart the controller for testing by entering
rptr
You will see a running commentary of what the repeater is doing in the console window. However, if you close the window, the repeater will stop. You can also stop it and get back to the command prompt by pressing ctrl-c.

You can start the repeater so that it runs and keeps a log of what it is doing (even if you close the controller window) by entering this command:
nohup atv-rptr/utils/run_rptr_nohup_with_log.sh &
Then press ctrl-c to get back to the command prompt.

If you see behaviour that you want to investigate, enter
stop
to force the last bit of the log to be written to the file, and then enter
tail -25 log.txt
to see the last 25 lines of the log.

Do not run the repeater for normal use using these test modes. The log file will grow over time and eventually fill the SD Card, causing the repeater to fail.

===Getting Back to Normal Use===

At the end of a maintenance session, you should always reboot the repeater to check that it is working properly and put it in its normal mode. Do this by typing
sudo reboot now
Close the SSH window, watch the repeater output and if all is well, walk away.

===Advanced Commands===

If you need to edit the C code, you can recompile it and run the repeater software with the command
urptr
This will also show you any errors if the compilation fails.

If you need to troubleshoot the output display settings, use
tvservice -s

=Editing the config file=

The configuration file is too comprehensive for all the functions to be edited from a simple menu and more advanced customisation will require the careful editing of the text file /home/pi/atv-rptr/config/repeater_config.txt

===Hand edit===
You can hand-edit the configuration file with the command
nano atv-rptr/config/repeater_config.txt
Use the arrow keys to move about (not the mouse) and save by pressing ctrl-x, y and then enter. Discard changes by simply pressing ctrl-x and then n.

If it has all gone wrong, you can start again with a factory-fresh configuration file using the command
cp atv-rptr/config/repeater_config.txt atv-rptr/config/repeater_config.txt.factory
Note that you will lose all of your previous edits.

===FTP===

Use a program such as WinSCP or Filezilla and either edit the config file in the RPi directory or copy it to a local drive, edit and then transfer it back.

==Actioning the changes==

After editing and saving, reload the controller by using item 1 in the SSH menu.

=IR Commands=

Where IR Commands are used in the config file, they are in the format
=protocol:code
for example:
outputhdmiquadcode=nec:0x18

As of software update 202503030, multiple IR commands can be sent for one function by the use of commas:
outputhdmiquadcode=nec:0x18,nec0x18,nec0x18
This command would send code 0x18 three times with an interval of 200ms in between. Commas are only permissible in the middle of the message, not at the start or end. No spaces allowed. Max length 63 characters.

=Typical config file=

The following is an example of a typical config with comments on each function - some functions are also available in the SSH menu

===Introduction===
Text file defining behaviour and config of the BATC HDMI Repeater Design
Comments must be on their own line
Read at boot time and only modified from console menu or text editor except transmitenabled which is amended by dtmfkeepertxoff or dtmfkeepertxon

===Station Details - also in SSH menu===
callsign=GB3HV

locator=IO91LD

===Video output===
Used to size captions and layout display only. It does NOT set the output to hdmi720, hdmi1080, pal, ntsc
vidout=hdmi1080

===Ident and K CW audio output===
This is used to set the output port (but not the hdmi keep-alive)
hdmi, jack or usb

audioout=hdmi

===Low level audio - also in SSH menu===
Turn on low level audio noise to keep hdmi audio active? yes/no
audiokeepalive=yes

audiokeepalivelevel=85

===TX key and Power Saving logic - also in SSH menu (see above for description)===
Enable/disable transmit ptt active? yes/no
transmitenabled=yes

Beacon mode only transmits carousel with ident. Set to no for rptr operation. yes/no
beaconmode=no

Continuous TX or power-saving. no/yes
transmitwhennotinuse=yes

Only transmit when input active. no/yes
minimisetx=no

Control mains switch for rack (and allocate GPIOs?). Note not compatible with use of input 7
rackmainscontrol=yes

GPIO pins for controlled rack shutdown (front panel button, shutdown signal and mains switch
racksdbuttongpiopin=21
racksdsignalgpiopin=24
rackmainspwrgpiopin=15

Turn off receiver rack and encoder to save power? Times UTC
rackpowersave=yes
rackpoweron1=1500
rackpoweroff1=2300
Set second times to be equal for one power-on period only
rackpoweron2=0000
rackpoweroff2=0000

Continuous operation or active hours only. yes/no
24houroperation=yes

Power save during second half hour in active hours? Default no.
Repeat and Ident are available/active during this time
halfhourpowersave=no

Operating times are UTC. Ignored for 24/7 operation
operatingtimestart=1300

operatingtimefinish=2330

Quiet hours behaviour:
repeatduringquiethours=no

identduringquiethours=no

===Transmit PTT Demand physical pin===
Recommended pin 40
pttgpiopin=40

===Front Panel Shutdown Enabled?===
Physical GPIO Pin (recommended 26)

fpshutdown=no

fpsdgpiopin=26

===DTMF repeater control===

Uses white "Portsdown/Langstone" USB dongle input

These are just example commands - see [[DATV repeater DTMF commands]] for more details

Control is on/off. Gain is %. Timeout is in seconds

dtmfcontrol=on

dtmfaudiogain=62

dtmfactiontimeout=600

'''All dtmf codes are of the format *xx#.''' Only xx isdefined below. Examples:

dtmfreset=00

To display the controller status screen - includes GPIO pin status (see below)

dtmfstatusview=01

Select quad view

dtmfquadview=04

Select input (when finished, use *00# to return to normal operation)

dtmfselectinput0=10

dtmfselectinput1=11

dtmfselectinput2=12

dtmfselectinput3=13

dtmfselectinput4=14

dtmfselectinput5=15

dtmfselectinput6=16

dtmfselectinput7=17

===DTMF Keeper codes===
'''In this example''' keeper codes are 5 digit and must start with 9 (*9xxxx#)

Turns Tx key on / off

dtmfkeepertxoff=97350

dtmfkeepertxon=97351

Reboot controller

dtmfkeeperreboot=97359

===DTMF Accessory Control examples===
DTMF input can also be used to control external equipment via the GPIO pins - a maximum of 10 devices can be connected.

Number of outputs

dtmfoutputs=1

Pin allocations

dtmfgpioout1pin=8

Label for status screen

dtmfgpioout1label=shack_light

DTMF commands to turn on and off

dtmfgpioout1on=31

dtmfgpioout1off=41

===GPIO inputs===
The controller can monitor GPIO pins and display their status on the status screen, displayed by DTMF *01# Note: Due to an error in coding, these functions are called "dtmf"gpio inputs.

Number of inputs

dtmfinputs=1

Pin allocationa

dtmfgpioin1pin=8

Label for status screen
dtmfgpioin1label=cabinet_door

===Background image for Caption Slides===
Caption cards such as "K" and input identification are built by the controller on this back ground - to change this, replace the .jpg with a different file of the same resolution

backimage=/home/pi/atv-rptr/media/batc_background.jpg

===Ident info===

Audio is on/off, Pitch in Hz, speed in wpm, level is %

identinterval=900

identmediatype=jpg

identmediaduration=5

identmediafile=/home/pi/tmp/ident.jpg

identcwaudio=on

identcwspeed=15

identcwpitch=800

identcwlevel=50

identcwfile=/home/pi/tmp/ident.wav

===K information===
Pitch in Hz, speed in wpm, level is %
kmediatype=jpg

kmediaduration=5

kmediafile=/home/pi/tmp/k.jpg

kcwaudio=on

kcwspeed=20

kcwpitch=800

kcwlevel=50

kcwfile=/home/pi/tmp/k.wav

===Carousel information===
The carousel can have up to 99 scenes. Each scene can either be jpg, (mp4 not implemented in current release), status screen or a video source on the switcher. Jpeg images are read each time the file is displayed. For a video source, "file" is source number which can be an individual source or the multi grid, if supported by the video switch.

carouselscenes=5

carousel01mediatype=jpg
carousel01file=/home/pi/atv-rptr/media/HVtest.jpg
carousel01mediaduration=10

carousel02mediatype=jpg
carousel02file=/home/pi/atv-rptr/media/weather.JPG
carousel02mediaduration=10

carousel03mediatype=jpg
carousel03file=/home/pi/atv-rptr/media/75cbw.jpg
carousel03mediaduration=5

carousel04mediatype=jpg
carousel04file=/home/pi/custom_media/tropo.JPG
carousel04mediaduration=10

carousel05mediatype=source
carousel05file=4
carousel05mediaduration=30
The example above has 4 images and one source (so 5 scenes). The 5th scene is the quad view; source 4 is set up below to show the Quad to enable its inclusion in the carousel.

Note that the 4th image above is located in the /home/pi/custom_media folder. It is recommended that site-specific images are saved in that folder, which will not be over-written during software updates.

===Analogue Talkback Audio on Carousel===

If using an i2c analogue audio switcher, the talkback audio can be enabled during the carousel

# Analogue talkback audio (144.75) can be turned on or off using the MCP23008 i2c switcher
talkbackaudio=on
talkbackaudioi2cbit=7

If using hdmi audio, the talkback can be input on the USB mic dongle (along with the DTMF) and output on the HDMI audio during the carousel. The audio gain is set by the dtmfaudiogain parameter as they both use the same input. Facility introduced in release 202402190.

# Talkback audio on DTMF input can also be output on the controller (k/cw ident) audio channel
# Volume is set by dtmfaudiogain above
controllertalkbackaudio=on

===Input configuration===

Recommended gpio pins for "input active" are 32, 35, 18, 22, 16, 19 and 21. The availableinputs number must be set to the number of possibly active (external, in addition to the controller) video sources. activeinputhold (yes/no) means that lower priority inputs do not get replaced by higher priority active inputs (except priority 1 inputs). If showquadformultipleinputs is set to yes, then the quad is sleected when 2 or more if its inputs are active.

Cascaded switches refers to whether 2 4-input switches are daisy chaned t get 7 (controller plus 6 external) inputs.

availableinputs=6
activeinputhold=no
showquadformultipleinputs=yes
cascadedswitches=no

===Output video switch config===

The output video switch configuration is defined by this block. The switching method is defined by outputswitchcontrol=. This can be ir, gpio or html. For ir or html, the gpio outputs can also be active if showoutputongpio= is set to yes.

The ir code to reset the hdmi switch (not currently used) is set in outputhdmiresetcode. The ir code to select a second (daisy-chained) hdmi switch is set in output2ndhdmicode. The ir code to select a quad view is set in outputhdmiquadcode.

The outputi2caddress is the base address for an i2c video switch, and the outputi2cquadchannel is the quad select for an i2c video switch. Neither of these codes are currently implemented.

outputswitchcontrol=ir
showoutputongpio=yes
outputhdmiresetcode=nec:0x17
output2ndhdmicode=nec:0x17
outputhdmiquadcode=nec:0x18
outputi2caddress=3
outputi2cquadchannel=9

===Bitfocus Companion Server Settings===

# Bitfocus Companion (html) server address & port (no trailing slash)
networkctrlurl=http://192.0.1.176:8888
# Other net commands have leading slash
outputquadnetcommand=/press/bank/1/11

===Configure input 0 - always allocated to controller===

The configuration for the controller output 6 elements (currently).

The input0name is the text name displayed on the Configuration screen.

The IR code required to select the controller video and send it to the repeater output is stated in output0code. The format is protocol:hex code. A 2 is added to the beginning of the string if the the input is on the second, daisy-chained, hdmi switch (ie 2nec:0x17). If GPIO switching of outputs is used, the output0hdmiswitchpin indicates which pin should be used. If an i2c-controlled video switcher is used, output0i2cchannel indicates which channel should be selected to display that input. Similarly, if network commands are being used to control an ATEM switch through BitFocus companion, the tail end of the network command is defined by output0netcommand.

For audio i2c switching, the correct bit is set by output0audioi2cbit.

input0name=Controller
output0code=nec:0x17
#output0code=2nec:0x17 (daisy chain)
output0hdmiswitchpin=36
output0i2cchannel=1
output0netcommand=/press/bank/1/8
output0audioi2cbit=0

===Configuration of External Inputs===

The configuration for each input has 11 elements (currently).

The inputxname is the text name displayed on the "announce" caption and on the Configuration screen. The priority level can be set from 1 to 9. A priority level of 9 means that the input is not displayed unless it is viewed as part of the quad or is directly selected by a DTMF command.

The inputxactivegpiopin is the physical pin number that the attached receiver sets high to indicate that a signal is present. The IR code required to select the input and send it to the repeater output is stated in outputxcode. The format is protocol:hex code. A 2 is added to the beginning of the string if the the input is on the second, daisy-chained, hdmi switch (ie 2nec:0x12). If GPIO switching of outputs is used, the outputxhdmiswitchpin indicates which pin should be used. If an i2c-controlled video switcher is used, outputxi2cchannel indicates which channel should be selected to display that input. Similarly, if network commands are being used to control an ATEM switch through BitFocus companion, the tail end of the network command is defined by outputxnetcommand.

For audio i2c switching, the correct bit is set by outputxaudioi2cbit.

The default announce media settings work with the captions that are generated during repeater start-up. The can be cahnge for custom media if required.

===Configure input 1===

input1name=Stream Input
input1prioritylevel=1
input1activegpiopin=32
output1code=nec:0x12
output1hdmiswitchpin=37
output1i2cchannel=2
output1netcommand=/press/bank/1/1
output1audioi2cbit=1
input1announcemediatype=jpg
input1announcemediafile=/home/pi/tmp/input1.jpg
input1announcemediaduration=3

===Configure input 2===

input2name=QO-100 RX
input2prioritylevel=2
input2activegpiopin=35
output2code=nec:0x59
output2hdmiswitchpin=38
output2i2cchannel=3
output2netcommand=/press/bank/1/2
output2audioi2cbit=2
input2announcemediatype=jpg
input2announcemediafile=/home/pi/tmp/input2.jpg
input2announcemediaduration=3

===Configure input 3===

input3name=3.4 GHz Ryde
input3prioritylevel=3
input3activegpiopin=18
output3code=nec:0x08
output3hdmiswitchpin=33
output3i2cchannel=4
output3netcommand=/press/bank/1/3
output3audioi2cbit=3
input3announcemediatype=jpg
input3announcemediafile=/home/pi/tmp/input3.jpg
input3announcemediaduration=3

===Configure input 4===
Input 4 is set to display the quad view. This enables it to be included in the carousel (as source 4).

input4name=Quad View
input4prioritylevel=7
input4activegpiopin=22
output4code=nec:0x18
#output4code=2nec:0x12 (daisy chain, not quad)
output4hdmiswitchpin=31
output4i2cchannel=5
output4netcommand=/press/bank/1/4
output4audioi2cbit=4
input4announcemediatype=jpg
input4announcemediafile=/home/pi/tmp/input4.jpg
input4announcemediaduration=3

===Configure input 5===

input5name=Mast Camera
input5prioritylevel=7
input5activegpiopin=16
output5code=2nec:0x59
output5hdmiswitchpin=29
output5i2cchannel=6
output5netcommand=/press/bank/1/5
output5audioi2cbit=5
input5announcemediatype=jpg
input5announcemediafile=/home/pi/tmp/input5.jpg
input5announcemediaduration=10

===Configure input 6===

input6name=Unused 6
input6prioritylevel=9
input6activegpiopin=19
output6code=2nec:0x08
#output6code=2nec:0x08 (daisy chain)
output6hdmiswitchpin=23
output6i2cchannel=7
output6netcommand=/press/bank/1/6
output6audioi2cbit=6
input6announcemediatype=jpg
input6announcemediafile=/home/pi/tmp/input6.jpg
input6announcemediaduration=3

===Configure input 7===

input7name=Unused 7
input7prioritylevel=9
input7activegpiopin=21
output7code=2nec:0x08
#output7code=2nec:0x12 (daisy chain)
output7hdmiswitchpin=24
output7i2cchannel=8
output7netcommand=/press/bank/1/7
output7audioi2cbit=7
input7announcemediatype=jpg
input7announcemediafile=/home/pi/tmp/input7.jpg
input7announcemediaduration=3

Repeater Controller configuration

2026-05-11T19:24:25Z

G8GKQ: /* TX key and Power Saving logic - also in SSH menu (see above for description) */

Back to [[Repeater Controller|repeater controller]] main page

This page describes the setup of the BATC repeater controller - it should only be attempted by advanced users.

'''Note not all functions listed in the config file are currently implemented.
'''
=SSH Menu=

Some configuration and some real-time control is possible using the ssh Console Menu.

To enter the repeater controller menu log in to the RPi by SSH using a program such as Putty and type menu.

[[File:controller main.JPG|600px]]

===Reload===

Loads the configuration changes you have made and restarts the controller

===1 Behaviour===

1 - Audio keepalive. Some HDMI switches permanently shut down the audio channel is no audio is present. This option puts low-level white noise on the controller audio out to prevent this from happening.

2 - Transmit enable. Enables transmit key line on pin xx

3 - Beacon mode. Enables the controller to just run in beacon mode and ignore all inputs.

4 - Power save. Enables transmit key line to be on continuously or just when the controller sees a valid input signal or when sending an ident.

5 - Operating hours. Selection of transmit key line to be active continuously or just during a timed period to save power. If timed, select the start and stop times. Note time is set using UTC time, not local time.

6 - Quiet hours repeat. If Timed operation was selected in menu 5, you can set if the repeater should repeat an input signal during the quiet time.

7 - Quiet hours ident. If Timed operation was selected in menu 5, you can set if the repeater should send the ident signal during the quiet time.

8 - Half hour. If enabled, the transmitter will only be keyed in beacon mode during the first 30 minutes of every hour and not during the 2nd half hour to save power.

9 - Quad auto enable. Enables the quad display to be automatically displayed when more than 1 selected inputs are present.

10 - Enable DTMF input. Enables over air DTMF control of the repeater

11 - Apply changes

12 - Return to main menu

===2 Callsign===

Entry of the repeater callsign and QRA locator for display on generated captions.

===3 Inputs===

1 - 7 Input. Enables priority of each input to be set

8 - Input count. Set this to the total number of inputs on the video switcher - Do NOT include the controller in this number.

9 - Active Hold. Determines if a higher priority input will override the currently selected input.

10 - Apply

11 - Main Menu

===4 Control===

Enables direct selection of any input source

===5 Update===
Check s/w version and update if needed.

===6 Settings===

1 - Reset factory defaults

2 - Check HDMI. Lists the HDMI settings for fault finding

3 - Main menu.

===7 Diagnostics===

===8 Reboot===

Does exactly that!

=Controlling the Repeater During Testing=

===Stopping the Controller===

The controller can be stopped by entering
stop
at the command line. This tells all the repeater processes to stop and should show a "Controller Software Not Running" caption on the HDMI output.

===Restarting the Controller for Testing===

You can restart the controller for testing by entering
rptr
You will see a running commentary of what the repeater is doing in the console window. However, if you close the window, the repeater will stop. You can also stop it and get back to the command prompt by pressing ctrl-c.

You can start the repeater so that it runs and keeps a log of what it is doing (even if you close the controller window) by entering this command:
nohup atv-rptr/utils/run_rptr_nohup_with_log.sh &
Then press ctrl-c to get back to the command prompt.

If you see behaviour that you want to investigate, enter
stop
to force the last bit of the log to be written to the file, and then enter
tail -25 log.txt
to see the last 25 lines of the log.

Do not run the repeater for normal use using these test modes. The log file will grow over time and eventually fill the SD Card, causing the repeater to fail.

===Getting Back to Normal Use===

At the end of a maintenance session, you should always reboot the repeater to check that it is working properly and put it in its normal mode. Do this by typing
sudo reboot now
Close the SSH window, watch the repeater output and if all is well, walk away.

===Advanced Commands===

If you need to edit the C code, you can recompile it and run the repeater software with the command
urptr
This will also show you any errors if the compilation fails.

If you need to troubleshoot the output display settings, use
tvservice -s

=Editing the config file=

The configuration file is too comprehensive for all the functions to be edited from a simple menu and more advanced customisation will require the careful editing of the text file /home/pi/atv-rptr/config/repeater_config.txt

===Hand edit===
You can hand-edit the configuration file with the command
nano atv-rptr/config/repeater_config.txt
Use the arrow keys to move about (not the mouse) and save by pressing ctrl-x, y and then enter. Discard changes by simply pressing ctrl-x and then n.

If it has all gone wrong, you can start again with a factory-fresh configuration file using the command
cp atv-rptr/config/repeater_config.txt atv-rptr/config/repeater_config.txt.factory
Note that you will lose all of your previous edits.

===FTP===

Use a program such as WinSCP or Filezilla and either edit the config file in the RPi directory or copy it to a local drive, edit and then transfer it back.

==Actioning the changes==

After editing and saving, reload the controller by using item 1 in the SSH menu.

=IR Commands=

Where IR Commands are used in the config file, they are in the format
=protocol:code
for example:
outputhdmiquadcode=nec:0x18

As of software update 202503030, multiple IR commands can be sent for one function by the use of commas:
outputhdmiquadcode=nec:0x18,nec0x18,nec0x18
This command would send code 0x18 three times with an interval of 200ms in between. Commas are only permissible in the middle of the message, not at the start or end. No spaces allowed. Max length 63 characters.

=Typical config file=

The following is an example of a typical config with comments on each function - some functions are also available in the SSH menu

===Introduction===
Text file defining behaviour and config of the BATC HDMI Repeater Design
Comments must be on their own line
Read at boot time and only modified from console menu or text editor except transmitenabled which is amended by dtmfkeepertxoff or dtmfkeepertxon

===Station Details - also in SSH menu===
callsign=GB3HV

locator=IO91LD

===Video output===
Used to size captions and layout display only. It does NOT set the output to hdmi720, hdmi1080, pal, ntsc
vidout=hdmi1080

===Ident and K CW audio output===
This is used to set the output port (but not the hdmi keep-alive)
hdmi, jack or usb

audioout=hdmi

===Low level audio - also in SSH menu===
Turn on low level audio noise to keep hdmi audio active? yes/no
audiokeepalive=yes

audiokeepalivelevel=85

===TX key and Power Saving logic - also in SSH menu (see above for description)===
Enable/disable transmit ptt active? yes/no
transmitenabled=yes

Beacon mode only transmits carousel with ident. Set to no for rptr operation. yes/no
beaconmode=no

Continuous TX or power-saving. no/yes
transmitwhennotinuse=yes

Only transmit when input active. no/yes
minimisetx=no

Control mains switch for rack (and allocate GPIOs?). Not not compatible with use of input 7
rackmainscontrol=yes

GPIO pins for controlled rack shutdown (front panel button, shutdown signal and mains switch
racksdbuttongpiopin=21
racksdsignalgpiopin=24
rackmainspwrgpiopin=15

Turn off receiver rack and encoder to save power? Times UTC
rackpowersave=yes
rackpoweron1=1500
rackpoweroff1=2300
Set second times to be equal for one power-on period only
rackpoweron2=0000
rackpoweroff2=0000

Continuous operation or active hours only. yes/no
24houroperation=yes

Power save during second half hour in active hours? Default no.
Repeat and Ident are available/active during this time
halfhourpowersave=no

Operating times are UTC. Ignored for 24/7 operation
operatingtimestart=1300

operatingtimefinish=2330

Quiet hours behaviour:
repeatduringquiethours=no

identduringquiethours=no

===Transmit PTT Demand physical pin===
Recommended pin 40
pttgpiopin=40

===Front Panel Shutdown Enabled?===
Physical GPIO Pin (recommended 26)

fpshutdown=no

fpsdgpiopin=26

===DTMF repeater control===

Uses white "Portsdown/Langstone" USB dongle input

These are just example commands - see [[DATV repeater DTMF commands]] for more details

Control is on/off. Gain is %. Timeout is in seconds

dtmfcontrol=on

dtmfaudiogain=62

dtmfactiontimeout=600

'''All dtmf codes are of the format *xx#.''' Only xx isdefined below. Examples:

dtmfreset=00

To display the controller status screen - includes GPIO pin status (see below)

dtmfstatusview=01

Select quad view

dtmfquadview=04

Select input (when finished, use *00# to return to normal operation)

dtmfselectinput0=10

dtmfselectinput1=11

dtmfselectinput2=12

dtmfselectinput3=13

dtmfselectinput4=14

dtmfselectinput5=15

dtmfselectinput6=16

dtmfselectinput7=17

===DTMF Keeper codes===
'''In this example''' keeper codes are 5 digit and must start with 9 (*9xxxx#)

Turns Tx key on / off

dtmfkeepertxoff=97350

dtmfkeepertxon=97351

Reboot controller

dtmfkeeperreboot=97359

===DTMF Accessory Control examples===
DTMF input can also be used to control external equipment via the GPIO pins - a maximum of 10 devices can be connected.

Number of outputs

dtmfoutputs=1

Pin allocations

dtmfgpioout1pin=8

Label for status screen

dtmfgpioout1label=shack_light

DTMF commands to turn on and off

dtmfgpioout1on=31

dtmfgpioout1off=41

===GPIO inputs===
The controller can monitor GPIO pins and display their status on the status screen, displayed by DTMF *01# Note: Due to an error in coding, these functions are called "dtmf"gpio inputs.

Number of inputs

dtmfinputs=1

Pin allocationa

dtmfgpioin1pin=8

Label for status screen
dtmfgpioin1label=cabinet_door

===Background image for Caption Slides===
Caption cards such as "K" and input identification are built by the controller on this back ground - to change this, replace the .jpg with a different file of the same resolution

backimage=/home/pi/atv-rptr/media/batc_background.jpg

===Ident info===

Audio is on/off, Pitch in Hz, speed in wpm, level is %

identinterval=900

identmediatype=jpg

identmediaduration=5

identmediafile=/home/pi/tmp/ident.jpg

identcwaudio=on

identcwspeed=15

identcwpitch=800

identcwlevel=50

identcwfile=/home/pi/tmp/ident.wav

===K information===
Pitch in Hz, speed in wpm, level is %
kmediatype=jpg

kmediaduration=5

kmediafile=/home/pi/tmp/k.jpg

kcwaudio=on

kcwspeed=20

kcwpitch=800

kcwlevel=50

kcwfile=/home/pi/tmp/k.wav

===Carousel information===
The carousel can have up to 99 scenes. Each scene can either be jpg, (mp4 not implemented in current release), status screen or a video source on the switcher. Jpeg images are read each time the file is displayed. For a video source, "file" is source number which can be an individual source or the multi grid, if supported by the video switch.

carouselscenes=5

carousel01mediatype=jpg
carousel01file=/home/pi/atv-rptr/media/HVtest.jpg
carousel01mediaduration=10

carousel02mediatype=jpg
carousel02file=/home/pi/atv-rptr/media/weather.JPG
carousel02mediaduration=10

carousel03mediatype=jpg
carousel03file=/home/pi/atv-rptr/media/75cbw.jpg
carousel03mediaduration=5

carousel04mediatype=jpg
carousel04file=/home/pi/custom_media/tropo.JPG
carousel04mediaduration=10

carousel05mediatype=source
carousel05file=4
carousel05mediaduration=30
The example above has 4 images and one source (so 5 scenes). The 5th scene is the quad view; source 4 is set up below to show the Quad to enable its inclusion in the carousel.

Note that the 4th image above is located in the /home/pi/custom_media folder. It is recommended that site-specific images are saved in that folder, which will not be over-written during software updates.

===Analogue Talkback Audio on Carousel===

If using an i2c analogue audio switcher, the talkback audio can be enabled during the carousel

# Analogue talkback audio (144.75) can be turned on or off using the MCP23008 i2c switcher
talkbackaudio=on
talkbackaudioi2cbit=7

If using hdmi audio, the talkback can be input on the USB mic dongle (along with the DTMF) and output on the HDMI audio during the carousel. The audio gain is set by the dtmfaudiogain parameter as they both use the same input. Facility introduced in release 202402190.

# Talkback audio on DTMF input can also be output on the controller (k/cw ident) audio channel
# Volume is set by dtmfaudiogain above
controllertalkbackaudio=on

===Input configuration===

Recommended gpio pins for "input active" are 32, 35, 18, 22, 16, 19 and 21. The availableinputs number must be set to the number of possibly active (external, in addition to the controller) video sources. activeinputhold (yes/no) means that lower priority inputs do not get replaced by higher priority active inputs (except priority 1 inputs). If showquadformultipleinputs is set to yes, then the quad is sleected when 2 or more if its inputs are active.

Cascaded switches refers to whether 2 4-input switches are daisy chaned t get 7 (controller plus 6 external) inputs.

availableinputs=6
activeinputhold=no
showquadformultipleinputs=yes
cascadedswitches=no

===Output video switch config===

The output video switch configuration is defined by this block. The switching method is defined by outputswitchcontrol=. This can be ir, gpio or html. For ir or html, the gpio outputs can also be active if showoutputongpio= is set to yes.

The ir code to reset the hdmi switch (not currently used) is set in outputhdmiresetcode. The ir code to select a second (daisy-chained) hdmi switch is set in output2ndhdmicode. The ir code to select a quad view is set in outputhdmiquadcode.

The outputi2caddress is the base address for an i2c video switch, and the outputi2cquadchannel is the quad select for an i2c video switch. Neither of these codes are currently implemented.

outputswitchcontrol=ir
showoutputongpio=yes
outputhdmiresetcode=nec:0x17
output2ndhdmicode=nec:0x17
outputhdmiquadcode=nec:0x18
outputi2caddress=3
outputi2cquadchannel=9

===Bitfocus Companion Server Settings===

# Bitfocus Companion (html) server address & port (no trailing slash)
networkctrlurl=http://192.0.1.176:8888
# Other net commands have leading slash
outputquadnetcommand=/press/bank/1/11

===Configure input 0 - always allocated to controller===

The configuration for the controller output 6 elements (currently).

The input0name is the text name displayed on the Configuration screen.

The IR code required to select the controller video and send it to the repeater output is stated in output0code. The format is protocol:hex code. A 2 is added to the beginning of the string if the the input is on the second, daisy-chained, hdmi switch (ie 2nec:0x17). If GPIO switching of outputs is used, the output0hdmiswitchpin indicates which pin should be used. If an i2c-controlled video switcher is used, output0i2cchannel indicates which channel should be selected to display that input. Similarly, if network commands are being used to control an ATEM switch through BitFocus companion, the tail end of the network command is defined by output0netcommand.

For audio i2c switching, the correct bit is set by output0audioi2cbit.

input0name=Controller
output0code=nec:0x17
#output0code=2nec:0x17 (daisy chain)
output0hdmiswitchpin=36
output0i2cchannel=1
output0netcommand=/press/bank/1/8
output0audioi2cbit=0

===Configuration of External Inputs===

The configuration for each input has 11 elements (currently).

The inputxname is the text name displayed on the "announce" caption and on the Configuration screen. The priority level can be set from 1 to 9. A priority level of 9 means that the input is not displayed unless it is viewed as part of the quad or is directly selected by a DTMF command.

The inputxactivegpiopin is the physical pin number that the attached receiver sets high to indicate that a signal is present. The IR code required to select the input and send it to the repeater output is stated in outputxcode. The format is protocol:hex code. A 2 is added to the beginning of the string if the the input is on the second, daisy-chained, hdmi switch (ie 2nec:0x12). If GPIO switching of outputs is used, the outputxhdmiswitchpin indicates which pin should be used. If an i2c-controlled video switcher is used, outputxi2cchannel indicates which channel should be selected to display that input. Similarly, if network commands are being used to control an ATEM switch through BitFocus companion, the tail end of the network command is defined by outputxnetcommand.

For audio i2c switching, the correct bit is set by outputxaudioi2cbit.

The default announce media settings work with the captions that are generated during repeater start-up. The can be cahnge for custom media if required.

===Configure input 1===

input1name=Stream Input
input1prioritylevel=1
input1activegpiopin=32
output1code=nec:0x12
output1hdmiswitchpin=37
output1i2cchannel=2
output1netcommand=/press/bank/1/1
output1audioi2cbit=1
input1announcemediatype=jpg
input1announcemediafile=/home/pi/tmp/input1.jpg
input1announcemediaduration=3

===Configure input 2===

input2name=QO-100 RX
input2prioritylevel=2
input2activegpiopin=35
output2code=nec:0x59
output2hdmiswitchpin=38
output2i2cchannel=3
output2netcommand=/press/bank/1/2
output2audioi2cbit=2
input2announcemediatype=jpg
input2announcemediafile=/home/pi/tmp/input2.jpg
input2announcemediaduration=3

===Configure input 3===

input3name=3.4 GHz Ryde
input3prioritylevel=3
input3activegpiopin=18
output3code=nec:0x08
output3hdmiswitchpin=33
output3i2cchannel=4
output3netcommand=/press/bank/1/3
output3audioi2cbit=3
input3announcemediatype=jpg
input3announcemediafile=/home/pi/tmp/input3.jpg
input3announcemediaduration=3

===Configure input 4===
Input 4 is set to display the quad view. This enables it to be included in the carousel (as source 4).

input4name=Quad View
input4prioritylevel=7
input4activegpiopin=22
output4code=nec:0x18
#output4code=2nec:0x12 (daisy chain, not quad)
output4hdmiswitchpin=31
output4i2cchannel=5
output4netcommand=/press/bank/1/4
output4audioi2cbit=4
input4announcemediatype=jpg
input4announcemediafile=/home/pi/tmp/input4.jpg
input4announcemediaduration=3

===Configure input 5===

input5name=Mast Camera
input5prioritylevel=7
input5activegpiopin=16
output5code=2nec:0x59
output5hdmiswitchpin=29
output5i2cchannel=6
output5netcommand=/press/bank/1/5
output5audioi2cbit=5
input5announcemediatype=jpg
input5announcemediafile=/home/pi/tmp/input5.jpg
input5announcemediaduration=10

===Configure input 6===

input6name=Unused 6
input6prioritylevel=9
input6activegpiopin=19
output6code=2nec:0x08
#output6code=2nec:0x08 (daisy chain)
output6hdmiswitchpin=23
output6i2cchannel=7
output6netcommand=/press/bank/1/6
output6audioi2cbit=6
input6announcemediatype=jpg
input6announcemediafile=/home/pi/tmp/input6.jpg
input6announcemediaduration=3

===Configure input 7===

input7name=Unused 7
input7prioritylevel=9
input7activegpiopin=21
output7code=2nec:0x08
#output7code=2nec:0x12 (daisy chain)
output7hdmiswitchpin=24
output7i2cchannel=8
output7netcommand=/press/bank/1/7
output7audioi2cbit=7
input7announcemediatype=jpg
input7announcemediafile=/home/pi/tmp/input7.jpg
input7announcemediaduration=3

The Muntjac SDR

2026-05-03T18:24:11Z

G8GKQ: /* Using the Third Harmonic of the Low Band for DATV on 23cm */

The Muntjac SDR was designed by Brian G4EWJ based on the same dual-band AT86RF215 RF chip as the commercially available CaribouLite SDR.

It is a transmit-only SDR for DVB-S2 DATV on 13cm (QO-100) and 70cm, which uses an RP2040 micro-controller, as used on the Raspberry Pi Pico, to provide a USB interface to the Portsdown 4.

When operating from the command line, the same transmission may be made on both bands simultaneously.

The 75 x 30mm board comes without SMA connectors, so that it can optionally be wired into a system, for maximum flexibility. Long thread SMA types are recommended.

The optional user-fitted ADE-30+ mixer is shown, which can be used for experiments on other bands. DATV is generated on the high band and mixed with the harmonic of a carrier on the low band. In theory, output on all bands from 1.8MHz to 3.4GHz is possible, but this is subject to further investigation.

Muntjac-4 was meant to be intermediate development version, but it is working well enough to make it available as part of an extended beta trial. Some configuration in Linux may be necessary, so if you don't consider yourself to be an 'early-adopter' it may be worth waiting until it has matured.

Please put any comments, questions or problems on the BATC Muntjac forum: '''https://forum.batc.org.uk/viewforum.php?f=148'''

[[File:cqtvmj25-1a.jpg|400px]] [[File:cqtvmj25-2a.jpg|400px]]

 
 

===Specifications===

The Muntjac SDR only operates with output frequencies in the following ranges: 390 - 510 MHz, 779- 1020 MHz and 2400 - 2483 MHz. Individual examples may operate slightly outside these frequency ranges, but not significantly. For our use, this means that the Muntjac can only be used directly on 70 cm and the QO-100 uplink. Clearly, with external transverters it could be used on any band.

When used with the Portsdown 4, the Muntjac will transmit DVB-S2 QPSK with symbol rates of 125, 250, 333.333, 500 and 1000 kS. It will also transmit DVB-S2 8PSK with symbol rates of 125, 250, 333.333 and 500 kS. DVB-S is not supported.

Transmit data is sent to the AT chip at 128M bits/s on an LVDS bus. This is 4M x 13bit IQ samples/s, with 4 times oversampling, which limits the symbol rate to 1000k symbols/s.

The output power setting parameter (gain) range of the AT86RF215 is 0-31, with each step being nominally 1dB and power zero being -15dBm.

When selecting power on the Portsdown screen, this parameter is restricted to a maximum of 20, as the shoulders on the output increase rapidly above this.

At power setting 20, shoulders on the output are at least 30dB down and are further down at lower output powers. Approximate output power is shown in the table below.

{| class="wikitable"
|+ Muntjac Performance
|-
! Gain Setting !! 437 MHz O/P !! 437 MHz Shoulders !! 2409 MHz O/P !! 2409 MHz Shoulders
|-
| 20 || +5.6 dBm || -34 dB || +4.1 dBm || -30 dB
|-
| 19 || +4.8 dBm || || +3.7 dBm ||
|-
| 18 || +4.0 dBm || || +2.8 dBm ||
|-
| 17 || +3.0 dBm || || +2.1 dBm ||
|-
| 16 || +2.1 dBm || || +1.2 dBm ||
|-
| 15 || +0.8 dBm || -40 dB || +0.5 dBm || -40 dB
|-
| 14 || +0.1 dBm || || -0.5 dBm ||
|-
| 13 || -0.9 dBm || || -1.4 dBm ||
|-
| 12 || -1.9 dBm || || -2.5 dBm ||
|-
| 11 || -2.6 dBm || || -3.3 dBm ||
|-
| 10 || -3.6 dBm || -50 dB || -4.4 dBm || -43 dB
|-
| 9 || -4.7 dBm || || -5.3 dBm ||
|-
| 8 || -5.7 dBm || || -6.3 dBm ||
|-
| 7 || -6.4 dBm || || -7.3 dBm ||
|-
| 6 || -7.4 dBm || || -8.3 dBm ||
|-
| 5 || -8.4 dBm || < -50 dB || -9.3 dBm || < -45 dB
|-
| 4 || -9.4 dBm || || -10.3 dBm ||
|-
| 3 || -10.2 dBm || || -11.1 dBm ||
|-
| 2 || -11.2 dBm || || -12.1 dBm ||
|-
| 1 || -12.2 dBm || || -13.1 dBm ||
|-
| 0 || -13.2 dBm || < -50 dB || -14.1 dBm || < -45 dB
|}

The output power at 900 MHz is typically 3 dB less than that at 437 MHz.

===Preparing for Use===

The Muntjac is supplied as a kit with the final assembly step of soldering the output connectors to the PCB required for completion. The SMA connectors are not supplied. If the SDR is to be mounted in a box (it does fit a small die-cast box) right-angle SMAs with long shafts should be used to allow sufficient clearance between the SMA plug and the box. An suitable example connector is this:
https://www.mouser.co.uk/ProductDetail/TE-Connectivity-Linx-Technologies/CONSMA002-L-G?qs=vLWxofP3U2xfxfFnu8BdmA%3D%3D

[[File:SMA Connector.png|200px]]

Cheaper suitable connectors are available on eBay.

An example of the Muntjac mounted in a box (with short SMA Conectors) is shown here.

[[File:Muntjac boxed.jpg|400px]]

===Another Boxing Idea===

As Muntjac-4 was meant to be an intermediate development version, not much thought was given to fitting it into a box.

The Hammond 1550P can be used by cutting slots into the top edges of the box and dropping in the Muntjac-4 board vertically.

The 1550P is about £6 in bare metal and about double that as the 1550PBK with a black finish.

[[File:Mj1550p.png|400px]]

===Using Muntjac with the Portsdown 4===

The Muntjac connects to the Portsdown by USB. No other power supply is required. The Muntjac drivers are included in the latest Portsdown 4 software, so make sure that your Portsdown is up to date using Menu 3 and 'Check for Update'. If the Muntjac is connected to the Portsdown, disconnect it before updating.

The first time you use each Muntjac device, it needs to be registered so that the Raspberry Pi recognises it at the next reboot. After connecting a "new" Muntjac to your Portsdown 4, select "Output to" and then "Muntjac". If "Output to" is already set to "Muntjac", select "Output to" and then "Muntjac" again. A message will pop up saying "System will reboot now to register new Muntjac. Touch screen to continue". Touch the screen, and after the reboot, your Muntjac is ready for use. This procedure also copies any published calibration file (see below) to the correct folder for use

You will not need to repeat this process unless you connect a different Muntjac, or you use a different Portsdown.

Next, set the Muntjac gain with reference to the table above. Then connect the correct output to your transmit amplifier; the low band output is used for 437 MHz (and 900 MHz) and the high band output is used for 2400 MHz. The high band output is to the north of the "Muntjac-4" legend.

Within the limitations above, the Muntjac behaves similarly to a LimeSDR Mini.

===LEDs===

There is a main LED near the buttons and an LED near each SMA socket.

The main LED blinks 'HI' in morse (.... ..) at power up. This is for software version 1v0b. Later versions will blink 'MJ' and the last letter of the software version. After a few seconds for initialisation, the main LED will light steady.

The LED near each SMA socket is normally off and lights when that band (low or high) is in use.

The main LED is normally on and blinks off 1 / 2 / 3 times depending on whether low / high / both bands are active.

If the main LED blinks quickly and continuously, this indicates a Muntjac error and it is waiting for the USB data feed from the Portsdown to be stopped.

The main LED output is also available on the 12 pin J4 socket position, for mounting on a box. Pin 11 is ground and pin 12 is for the +ve end of an LED, through a suitable resistor.

Pin 1 of J4 is the square pad and odd numbered pins are along the edge of the board.

===First Transmission===

If you're not familiar with the Portsdown, set the lines starting 'Modulation', 'Freq' and 'EasyCap' as shown and enter your callsign via 'Menu 3' and 'Set Call, Loc & PIDs'.

[[File:Pdmainscreen1.png|400px]]

Press 'TX' and after a second or two, the Muntjac main LED near the buttons will start double blinking off and the LED near the high band SMA will light steady.

===Monitoring Muntjac Driver Operation===

The Muntjac driver (muntjacsdr_dvb) on the Portsdown outputs a log to a UDP network port. To see this, log into the Portsdown with ssh and type:

nc -kluv 9979

The status is updated every second and should look something like this:

======================================
muntjacsdr_dvb-1v0m Portsdown driver version.
muntjac4_pico-1v0p Muntjac firmware version.
In: videots The driver transport stream input device.
Out: /dev/ttyMJ0 The Muntjac device name.
-------------------
FR:2486.500 PWR:3 S:333 FEC:2/3 C:4 Main frequency and parameters.
FR:780.000 PWR:26 Carrier This line appears when mixing.
FT:146.500 The target frequency.
--------------------------------------
Packets Frames Panic Nulls MJ Panic frames are inserted to prevent
In Out Frames SR333 Errors the Muntjac from running out of data.
-------------------------------------- Nulls SR333 are inserted to maintain
4753 176 11 4 0 an output of 333333kS from an input of
====================================== 333000.

MJ0: [Muntjac4-1v0p:E46164855B404B30 (BUFFER_LOW:2046)]

You may occasionally see a BUFFER_LOW message from the Muntjac. Some of the input modes
are not completely constant bit rate in the short term, especially the testcard and
contest numbers. A panic frame containing a few null packets is sent to the Muntjac to
stop the receiver from losing lock.

===Lack of Calibration Spikes===

The AT86RF215 chip does a self calibration before transmitting, but it does this with its final amplifier turned off, so it is not necessary to isolate the output for a number of seconds as with the Pluto and Lime. This is the observation so far, but it's early days for the project, so verify this for yourself.

===IQ Calibration===

Poor IQ balance in an SDR can cause a carrier (the local oscillator) to be transmitted at the centre frequency of a DATV transmission. This causes a reduction in received MER. The reduction is most noticeable at high MER, but it will not affect reception, because the MER is already high. It seems to have less effect when the MER is comparatively low, as on QO-100. It just looks wrong to see a spike in the middle of your signal.

The AT86RF215 chip does an IQ balance as part of its self calibration before transmitting, but it doesn't always do the best job. Fortunately there are registers in the chip which can be adjusted to improve the local oscillator suppression. The required register values vary with the power setting, although not very much within each group of four power settings, so calibration values are only required for power settings 0, 4, 8, 12, 16, 20, 24, 28.

Some Muntjacs may have been calibrated before sale. The calibration files for these are included in the latest Portsdown software, and the correct file is loaded when the Muntjac is registered using the procedure above. However, some may not have been factory calibrated (although they will have been tested). They will function perfectly well for DATV without this file. A tool is under development to enable the Muntjac calibration file to be generated by the user.

The Muntjac calibration file has a file name of the format E46214B063533828.mjo where the E number is the flash ID of the RP2040 chip. A file of the correct format with the correct name in the /home/pi/rpidatv/bin/ folder is automatically read by the Muntjac driver and the settings applied. The library of files is in the folder /home/pi/rpidatv/src/muntjac. If you would like your calibration file added to this library, please e-mail it to G8GKQ. An example file can be found at https://github.com/davecrump/portsdown4/blob/master/src/muntjac/E46214B063533828.mjo.

===Output Filtering===

The low band output must be bandpass filtered.

The high band output uses a combined bandpass and notch filter balun, specially designed for the AT86RF215, so additional filtering should not be necessary.

If the low band output is also active, additional filtering on the high band output may be required, to address any feedthrough from the low band output and its harmonics.

https://www.johansontechnology.com/docs/796/2450FB15A050_VdAqien.pdf

===Frequency Accuracy===

The AT86RF215 uses an externally connected 26MHz TXCO on the pcb, with a temperature stability of 0.5ppm and initial accuracy of +/- 2ppm. The 2.4GHz output should be within a few kHz of nominal.

https://aker-usa.com/spec/TX21.pdf

===Shoulders at Various Power Settings===

The plots below show the effect of the power setting on the level of the shoulders at SR333. Shoulders are generally lower on 437MHz for the same power setting.

[[File:Snap80a.jpg|400px]] [[File:Snap76b.jpg|400px]]

[[File:Snap75c.jpg|400px]] [[File:Snap77d.jpg|400px]]

The rising levels at the edges of the plots are an artefact of the Pluto band viewer, as shown by the PWR8 plot in a 10MHz bandwidth.

[[File:Snap78e.jpg|400px]]

===Programming the Microcontroller on the Muntjac===

Muntjacs are provided pre-programmed by the BATC Shop, but this is the procedure to load a firmware update if required.

1. Locate the latest compiled firmware file 'muntjac4_pico-1v**.uf2' which will be found here https://github.com/davecrump/portsdown4/blob/master/src/muntjac/muntjac4_pico-1v0p.uf2 and save it to your desktop.

2. Hold down the BT button (the one nearest the SMA sockets) on the Muntjac while connecting it to your PC using its USB port. The Pico Muntjac appears as a USB disk drive on your PC.

3. Copy the .uf2 file onto the USB drive. The transfer should take about 5 seconds. The Muntjac will recognise the file and immediately update its firmware, reboot and the PC should recognise a new USB COM device. The main LED on the Muntjac will blink in morse as it reboots. This will be 'HI' for firmware version 1v0b and "MJ" plus the last letter of the firmware version for later versions of the firmware. The main LED will then go off for a few seconds while Muntjac is initialising and then light steady.

4. Disconnect the Muntjac from the PC and connect it to the Portsdown. Make sure that the Muntjac is selected as the Output Device and then Select M2, Info. The Muntjac firmware version will be displayed along with the Muntjac Flash ID.

===Alternative Method of Putting the Microcontroller into Firmware Update Mode===

This may be useful if you've built the Muntjac into a box and cannot easily get to its buttons.

1. Plug the Muntjac into a PC and it will appear as a COM port. Note that this may not work through a USB3 hub.

2. Find the COM port number in device manager and open a serial terminal session to that COM port at 1200 baud, with a terminal program such as putty.

3. The COM port will instantly disappear and the Muntjac will then appear as a USB drive.

4. Proceed with step 3 in the section above.

Note that this depends on the software already in the Muntjac being configured to do this. This approach would not work on a blank Raspberry Pi Pico board, which uses the same RP2040 microcontroller as the Muntjac.

[[File:MJputty1.png|400px]]

===Updating the Muntjac Firmware Using a Portsdown===

If the Muntjac is built into a Portsdown system, it may not be possible to access its USB socket. A procedure is being developed to help with this.

===Mixing Options===

As both high and low band outputs may be active at the same time, this gives some options for using a mixer to transvert to other bands.

The same DATV transmission can be made simultaneously on both bands (but NOT from a Portsdown menu), but either band can output a carrier instead and the third harmonic of the low band output can be used to mix the high band output to various frequencies.

These notes are to guide experimentation. Some of the high band frequencies are outside the published specification of the AT86RF215 chip (2400-2483.5MHz). The output must be monitored for quality, stability and frequency accuracy.

Any mixer output MUST be bandpass filtered for the required output frequency. This is particularly important for 23cm, where on 1270MHz for example, the required third harmonic of the low band carrier may be only 58MHz away from the target frequency.

The low band carrier power is set at 26, which is nominally +11dBm. If a passive mixer is used, a Level7 (7dBm local oscillator) mixer is recommended. A suitable mixer is a MiniCircuits ADE-30+ (NOT the ADE-30W+, although that may be more suitable depending on your requirements). Mixers in the ADE series can look the same, but have different footprints, so do check carefully that any other mixer is compartible with the pcb. https://www.minicircuits.com/pdfs/ADE-30+.pdf

The high and low band outputs are connected to the RF and LO ports of the mixer, which are specced at 200-3000MHz and the output is taken from the IF port, which is specced at 0-1000MHz. The output is likely to be in the range of the tens of microwatts. The 23cm band is outside the IF range, but still produces a usable output.

The following frequency ranges are built into the Muntjac driver in the Portsdown. Putting the target frequency into Portsdown will automatically select the correct high and low band frequencies for mixing.

{| class="wikitable"
|+ Mixing Options
|-
! Output !! Low !! Harmonic !! High
|-
| 3400-3410 || 1010 || - || 2390-2400
|-
| 1300-1305 || 395 || 1185 || 2395-2400
|-
| 1270-1280 || 404 || 1212 || 2482-2492
|-
| 1244-1250 || 390 || 1170 || 2414-2420
|-
| 144-147 || 780 || 2340 || 2484-2487
|-
| 70.5-71.5 || 805 || 2415 || 2485.5-2486.5
|-
| 50-54 || 812 || 2436 || 2486-2490
|-
| 28-30 || 819 || 2457 || 2483-2485
|}

===Fitting and Using the Onboard Mixer===

Details will appear here.

===Using the Third Harmonic of the Low Band for DATV on 23cm===

The third harmonic of 418.333 MHz can be used to transmit on 1255 MHz. The third harmonic is about 20 dB down on the fundamental, so good filtering is required. More details will appear here.

[[File:Third Harmonic.jpg|400px]]

''The fundamental at 418.3 MHz on the left with the 3rd harmonic on 1255 MHz on the right''

===Command Line Operation===

This gives full control over frequency and power on both high and low band simultaneously and enables Portsdown band viewer to be run at the same time.

Details will appear here.

===Muntjac Schematic===

Downloadable PDF files will be available shortly.

[[File:Image 2026-04-28 12-58-03.png|1080px]]

===Muntjac Input/Output Connectors===

The 40 pin J101 position will allow the Muntjac to connect directly to a Raspberry Pi. This will provide power and also an SPI link, which will allow higher data rates for future development. It is recommended that no connector is fitted here until the required orientation and gender is known.

The 8 pin J3 position can be used for general I/O or to allow future developments to connect a WIZnet Ethernet module for applications that do not require a Raspberry Pi.

The 12 pin J4 position is for general I/O.

3.3v power is available on J3 and J4. The available current is yet to be determined.

All Muntjac I/O pins on J3 and J4 are connected directly to the RP2040 microcontroller, so caution should be exercised regarding static and voltage levels. 3.3v is the nominal voltage level.

There are no pins on J3 or J4 that connect to J101.

===Problems===

The Muntjac may not be seen as a USB COM port when connected to a USB3 hub. The USB3 sockets on the RPi4 are not a problem. However, it will appear as a virtual USB drive for software update when connected to a USB3 hub, which is odd.

The Muntjac SDR

2026-04-28T13:02:07Z

G8GKQ: /* Using the Third Harmonic of the Low Band for DATV on 23cm */

The Muntjac SDR was designed by Brian G4EWJ based on the same dual-band AT86RF215 RF chip as the commercially available CaribouLite SDR.

It is a transmit-only SDR for DVB-S2 DATV on 13cm (QO-100) and 70cm, which uses an RP2040 micro-controller, as used on the Raspberry Pi Pico, to provide a USB interface to the Portsdown 4.

When operating from the command line, the same transmission may be made on both bands simultaneously.

The 75 x 30mm board comes without SMA connectors, so that it can optionally be wired into a system, for maximum flexibility. Long thread SMA types are recommended.

The optional user-fitted ADE-30+ mixer is shown, which can be used for experiments on other bands. DATV is generated on the high band and mixed with the harmonic of a carrier on the low band. In theory, output on all bands from 1.8MHz to 3.4GHz is possible, but this is subject to further investigation.

Muntjac-4 was meant to be intermediate development version, but it is working well enough to make it available as part of an extended beta trial. Some configuration in Linux may be necessary, so if you don't consider yourself to be an 'early-adopter' it may be worth waiting until it has matured.

Please put any comments, questions or problems on the BATC Muntjac forum: '''https://forum.batc.org.uk/viewforum.php?f=148'''

[[File:cqtvmj25-1a.jpg|400px]] [[File:cqtvmj25-2a.jpg|400px]]

 
 

===Specifications===

The Muntjac SDR only operates with output frequencies in the following ranges: 390 - 510 MHz, 779- 1020 MHz and 2400 - 2483 MHz. Individual examples may operate slightly outside these frequency ranges, but not significantly. For our use, this means that the Muntjac can only be used directly on 70 cm and the QO-100 uplink. Clearly, with external transverters it could be used on any band.

When used with the Portsdown 4, the Muntjac will transmit DVB-S2 QPSK with symbol rates of 125, 250, 333.333, 500 and 1000 kS. It will also transmit DVB-S2 8PSK with symbol rates of 125, 250, 333.333 and 500 kS. DVB-S is not supported.

Transmit data is sent to the AT chip at 128M bits/s on an LVDS bus. This is 4M x 13bit IQ samples/s, with 4 times oversampling, which limits the symbol rate to 1000k symbols/s.

The output power setting parameter (gain) range of the AT86RF215 is 0-31, with each step being nominally 1dB and power zero being -15dBm.

When selecting power on the Portsdown screen, this parameter is restricted to a maximum of 20, as the shoulders on the output increase rapidly above this.

At power setting 20, shoulders on the output are at least 30dB down and are further down at lower output powers. Approximate output power is shown in the table below.

{| class="wikitable"
|+ Muntjac Performance
|-
! Gain Setting !! 437 MHz O/P !! 437 MHz Shoulders !! 2409 MHz O/P !! 2409 MHz Shoulders
|-
| 20 || +5.6 dBm || -34 dB || +4.1 dBm || -30 dB
|-
| 19 || +4.8 dBm || || +3.7 dBm ||
|-
| 18 || +4.0 dBm || || +2.8 dBm ||
|-
| 17 || +3.0 dBm || || +2.1 dBm ||
|-
| 16 || +2.1 dBm || || +1.2 dBm ||
|-
| 15 || +0.8 dBm || -40 dB || +0.5 dBm || -40 dB
|-
| 14 || +0.1 dBm || || -0.5 dBm ||
|-
| 13 || -0.9 dBm || || -1.4 dBm ||
|-
| 12 || -1.9 dBm || || -2.5 dBm ||
|-
| 11 || -2.6 dBm || || -3.3 dBm ||
|-
| 10 || -3.6 dBm || -50 dB || -4.4 dBm || -43 dB
|-
| 9 || -4.7 dBm || || -5.3 dBm ||
|-
| 8 || -5.7 dBm || || -6.3 dBm ||
|-
| 7 || -6.4 dBm || || -7.3 dBm ||
|-
| 6 || -7.4 dBm || || -8.3 dBm ||
|-
| 5 || -8.4 dBm || < -50 dB || -9.3 dBm || < -45 dB
|-
| 4 || -9.4 dBm || || -10.3 dBm ||
|-
| 3 || -10.2 dBm || || -11.1 dBm ||
|-
| 2 || -11.2 dBm || || -12.1 dBm ||
|-
| 1 || -12.2 dBm || || -13.1 dBm ||
|-
| 0 || -13.2 dBm || < -50 dB || -14.1 dBm || < -45 dB
|}

The output power at 900 MHz is typically 3 dB less than that at 437 MHz.

===Preparing for Use===

The Muntjac is supplied as a kit with the final assembly step of soldering the output connectors to the PCB required for completion. The SMA connectors are not supplied. If the SDR is to be mounted in a box (it does fit a small die-cast box) right-angle SMAs with long shafts should be used to allow sufficient clearance between the SMA plug and the box. An suitable example connector is this:
https://www.mouser.co.uk/ProductDetail/TE-Connectivity-Linx-Technologies/CONSMA002-L-G?qs=vLWxofP3U2xfxfFnu8BdmA%3D%3D

[[File:SMA Connector.png|200px]]

Cheaper suitable connectors are available on eBay.

An example of the Muntjac mounted in a box (with short SMA Conectors) is shown here.

[[File:Muntjac boxed.jpg|400px]]

===Another Boxing Idea===

As Muntjac-4 was meant to be an intermediate development version, not much thought was given to fitting it into a box.

The Hammond 1550P can be used by cutting slots into the top edges of the box and dropping in the Muntjac-4 board vertically.

The 1550P is about £6 in bare metal and about double that as the 1550PBK with a black finish.

[[File:Mj1550p.png|400px]]

===Using Muntjac with the Portsdown 4===

The Muntjac connects to the Portsdown by USB. No other power supply is required. The Muntjac drivers are included in the latest Portsdown 4 software, so make sure that your Portsdown is up to date using Menu 3 and 'Check for Update'. If the Muntjac is connected to the Portsdown, disconnect it before updating.

The first time you use each Muntjac device, it needs to be registered so that the Raspberry Pi recognises it at the next reboot. After connecting a "new" Muntjac to your Portsdown 4, select "Output to" and then "Muntjac". If "Output to" is already set to "Muntjac", select "Output to" and then "Muntjac" again. A message will pop up saying "System will reboot now to register new Muntjac. Touch screen to continue". Touch the screen, and after the reboot, your Muntjac is ready for use. This procedure also copies any published calibration file (see below) to the correct folder for use

You will not need to repeat this process unless you connect a different Muntjac, or you use a different Portsdown.

Next, set the Muntjac gain with reference to the table above. Then connect the correct output to your transmit amplifier; the low band output is used for 437 MHz (and 900 MHz) and the high band output is used for 2400 MHz. The high band output is to the north of the "Muntjac-4" legend.

Within the limitations above, the Muntjac behaves similarly to a LimeSDR Mini.

===LEDs===

There is a main LED near the buttons and an LED near each SMA socket.

The main LED blinks 'HI' in morse (.... ..) at power up. This is for software version 1v0b. Later versions will blink 'MJ' and the last letter of the software version.

The LED near each SMA socket is normally off and lights when that band (low or high) is in use.

The main LED is normally on and blinks off 1 / 2 / 3 times depending on whether low / high / both bands are active.

If the main LED blinks quickly and continuously, this indicates a Muntjac error and it is waiting for the USB data feed from the Portsdown to be stopped.

The main LED output is also available on the 12 pin J4 socket position, for mounting on a box. Pin 11 is ground and pin 12 is for the +ve end of an LED, through a suitable resistor.

Pin 1 of J4 is the square pad and odd numbered pins are along the edge of the board.

===First Transmission===

If you're not familiar with the Portsdown, set the lines starting 'Modulation', 'Freq' and 'EasyCap' as shown and enter your callsign via 'Menu 3' and 'Set Call, Loc & PIDs'.

[[File:Pdmainscreen1.png|400px]]

Press 'TX' and after a second or two, the Muntjac main LED near the buttons will start double blinking off and the LED near the high band SMA will light steady.

===Monitoring Muntjac Driver Operation===

The Muntjac driver (muntjacsdr_dvb) on the Portsdown outputs a log to a UDP network port. To see this, log into the Portsdown with ssh and type:

nc -kluv 9979

===Lack of Calibration Spikes===

The AT86RF215 chip does a self calibration before transmitting, but it does this with its final amplifier turned off, so it is not necessary to isolate the output for a number of seconds as with the Pluto and Lime. This is the observation so far, but it's early days for the project, so verify this for yourself.

===IQ Calibration===

Poor IQ balance in an SDR can cause a carrier (the local oscillator) to be transmitted at the centre frequency of a DATV transmission. This causes a reduction in received MER. The reduction is most noticeable at high MER, but it will not affect reception, because the MER is already high. It seems to have less effect when the MER is comparatively low, as on QO-100. It just looks wrong to see a spike in the middle of your signal.

The AT86RF215 chip does an IQ balance as part of its self calibration before transmitting, but it doesn't always do the best job. Fortunately there are registers in the chip which can be adjusted to improve the local oscillator suppression. The required register values vary with the power setting, although not very much within each group of four power settings, so calibration values are only required for power settings 0, 4, 8, 12, 16, 20, 24, 28.

Some Muntjacs may have been calibrated before sale. The calibration files for these are included in the latest Portsdown software, and the correct file is loaded when the Muntjac is registered using the procedure above. However, some may not have been factory calibrated (although they will have been tested). They will function perfectly well for DATV without this file. A tool is under development to enable the Muntjac calibration file to be generated by the user.

The Muntjac calibration file has a file name of the format E46214B063533828.mjo where the E number is the flash ID of the RP2040 chip. A file of the correct format with the correct name in the /home/pi/rpidatv/bin/ folder is automatically read by the Muntjac driver and the settings applied. The library of files is in the folder /home/pi/rpidatv/src/muntjac. If you would like your calibration file added to this library, please e-mail it to G8GKQ. An example file can be found at https://github.com/davecrump/portsdown4/blob/master/src/muntjac/E46214B063533828.mjo.

===Output Filtering===

The low band output must be bandpass filtered.

The high band output uses a combined bandpass and notch filter balun, specially designed for the AT86RF215, so additional filtering should not be necessary.

If the low band output is also active, additional filtering on the high band output may be required, to address any feedthrough from the low band output and its harmonics.

https://www.johansontechnology.com/docs/796/2450FB15A050_VdAqien.pdf

===Frequency Accuracy===

The AT86RF215 uses an externally connected 26MHz TXCO on the pcb, with a temperature stability of 0.5ppm and initial accuracy of +/- 2ppm. The 2.4GHz output should be within a few kHz of nominal.

https://aker-usa.com/spec/TX21.pdf

===Shoulders at Various Power Settings===

The plots below show the effect of the power setting on the level of the shoulders at SR333. Shoulders are generally lower on 437MHz for the same power setting.

[[File:Snap80a.jpg|400px]] [[File:Snap76b.jpg|400px]]

[[File:Snap75c.jpg|400px]] [[File:Snap77d.jpg|400px]]

The rising levels at the edges of the plots are an artefact of the Pluto band viewer, as shown by the PWR8 plot in a 10MHz bandwidth.

[[File:Snap78e.jpg|400px]]

===Programming the Microcontroller on the Muntjac===

Muntjacs are provided pre-programmed by the BATC Shop, but this is the procedure to load a firmware update if required.

1. Locate the latest compiled firmware file 'muntjac4_pico-1v**.uf2' which will be found here https://github.com/davecrump/portsdown4/blob/master/src/muntjac/muntjac4_pico-1v0p.uf2 and save it to your desktop.

2. Hold down the BT button (the one nearest the SMA sockets) on the Muntjac while connecting it to your PC using its USB port. The Pico Muntjac appears as a USB disk drive on your PC.

3. Copy the .uf2 file onto the USB drive. The Muntjac will recognise the file and immediately update its firmware, reboot and the PC should recognise a new USB COM device. The main LED on the Muntjac will blink in morse as it reboots. This will be 'HI' for firmware version 1v0b and "MJ" plus the last letter of the firmware version for later versions of the firmware.

4. Disconnect the Muntjac from the PC and connect it to the Portsdown. Make sure that the Muntjac is selected as the Output Device and then Select M2, Info. The Muntjac firmware version will be displayed along with the Muntjac Flash ID.

===Alternative Method of Putting the Microcontroller into Firmware Update Mode===

This may be useful if you've built the Muntjac into a box and cannot easily get to its buttons.

1. Plug the Muntjac into a PC and it will appear as a COM port. Note that this may not work through a USB3 hub.

2. Find the COM port number in device manager and open a serial terminal session to that COM port at 1200 baud, with a terminal program such as putty.

3. The COM port will instantly disappear and the Muntjac will then appear as a USB drive.

4. Proceed with step 3 in the section above.

Note that this depends on the software already in the Muntjac being configured to do this. This approach would not work on a blank Raspberry Pi Pico board, which uses the same RP2040 microcontroller as the Muntjac.

[[File:MJputty1.png|400px]]

===Mixing Options===

As both high and low band outputs may be active at the same time, this gives some options for using a mixer to transvert to other bands.

The same DATV transmission can be made simultaneously on both bands (but NOT from a Portsdown menu), but either band can output a carrier instead and the third harmonic of the low band output can be used to mix the high band output to various frequencies.

These notes are to guide experimentation. Some of the high band frequencies are outside the published specification of the AT86RF215 chip (2400-2483.5MHz). The output must be monitored for quality, stability and frequency accuracy.

Any mixer output MUST be bandpass filtered for the required output frequency. This is particularly important for 23cm, where on 1270MHz for example, the required third harmonic of the low band carrier may be only 58MHz away from the target frequency.

The low band carrier power is set at 26, which is nominally +11dBm. If a passive mixer is used, a Level7 (7dBm local oscillator) mixer is recommended. A suitable mixer is a MiniCircuits ADE-30+ (NOT the ADE-30W+, although that may be more suitable depending on your requirements). https://www.minicircuits.com/pdfs/ADE-30+.pdf

The high and low band outputs are connected to the RF and LO ports of the mixer, which are specced at 200-3000MHz and the output is taken from the IF port, which is specced at 0-1000MHz. The output is likely to be in the range of the tens of microwatts. The 23cm band is outside the IF range, but still produces a usable output.

The following frequency ranges are built into the Muntjac driver in the Portsdown. Putting the target frequency into Portsdown will automatically select the correct high and low band frequencies for mixing.

{| class="wikitable"
|+ Mixing Options
|-
! Output !! Low !! Harmonic !! High
|-
| 3400-3410 || 1010 || - || 2390-2400
|-
| 1300-1305 || 395 || 1185 || 2395-2400
|-
| 1270-1280 || 404 || 1212 || 2482-2492
|-
| 1244-1250 || 390 || 1170 || 2414-2420
|-
| 144-147 || 780 || 2340 || 2484-2487
|-
| 70.5-71.5 || 805 || 2415 || 2485.5-2486.5
|-
| 50-54 || 812 || 2436 || 2486-2490
|-
| 28-30 || 819 || 2457 || 2483-2485
|}

===Fitting and Using the Onboard Mixer===

Details will appear here.

===Using the Third Harmonic of the Low Band for DATV on 23cm===

The third hamonic of 418.333 MHz can be used to transmit on 1255 MHz. The third harmonic is about 20 dB down on the fundamental, so good filtering is required. More details will appear here.

[[File:Third Harmonic.jpg|400px]]

''The fundamental at 418.3 MHz on the left with the 3rd harmonic on 1255 MHz on the right''

===Command Line Operation===

This gives full control over frequency and power on both high and low band simultaneously and enables Portsdown band viewer to be run at the same time.

Details will appear here.

===Muntjac Schematic===

Downloadable PDF files will be available shortly.

[[File:Image 2026-04-28 12-58-03.png|1080px]]

===Muntjac Input/Output Connectors===

The 40 pin J101 position will allow the Muntjac to connect directly to a Raspberry Pi. This will provide power and also an SPI link, which will allow higher data rates for future development. It is recommended that no connector is fitted here until the required orientation and gender is known.

The 8 pin J3 position can be used for general I/O or to allow future developments to connect a WIZnet Ethernet module for applications that do not require a Raspberry Pi.

The 12 pin J4 position is for general I/O.

3.3v power is available on J3 and J4. The available current is yet to be determined.

All Muntjac I/O pins on J3 and J4 are connected directly to the RP2040 microcontroller, so caution should be exercised regarding static and voltage levels. 3.3v is the nominal voltage level.

There are no pins on J3 or J4 that connect to J101.

===Problems===

The Muntjac may not be seen as a USB COM port when connected to a USB3 hub. The USB3 sockets on the RPi4 are not a problem. However, it will appear as a virtual USB drive for software update when connected to a USB3 hub, which is odd.

The Muntjac SDR

2026-04-28T12:53:12Z

G8GKQ: /* Using the Third Harmonic of the Low Band for DATV on 23cm */

The Muntjac SDR was designed by Brian G4EWJ based on the same dual-band AT86RF215 RF chip as the commercially available CaribouLite SDR.

It is a transmit-only SDR for DVB-S2 DATV on 13cm (QO-100) and 70cm, which uses an RP2040 micro-controller, as used on the Raspberry Pi Pico, to provide a USB interface to the Portsdown 4.

When operating from the command line, the same transmission may be made on both bands simultaneously.

The 75 x 30mm board comes without SMA connectors, so that it can optionally be wired into a system, for maximum flexibility. Long thread SMA types are recommended.

The optional user-fitted ADE-30+ mixer is shown, which can be used for experiments on other bands. DATV is generated on the high band and mixed with the harmonic of a carrier on the low band. In theory, output on all bands from 1.8MHz to 3.4GHz is possible, but this is subject to further investigation.

Muntjac-4 was meant to be intermediate development version, but it is working well enough to make it available as part of an extended beta trial. Some configuration in Linux may be necessary, so if you don't consider yourself to be an 'early-adopter' it may be worth waiting until it has matured.

Please put any comments, questions or problems on the BATC Muntjac forum: '''https://forum.batc.org.uk/viewforum.php?f=148'''

[[File:cqtvmj25-1a.jpg|400px]] [[File:cqtvmj25-2a.jpg|400px]]

 
 

===Specifications===

The Muntjac SDR only operates with output frequencies in the following ranges: 390 - 510 MHz, 779- 1020 MHz and 2400 - 2483 MHz. Individual examples may operate slightly outside these frequency ranges, but not significantly. For our use, this means that the Muntjac can only be used directly on 70 cm and the QO-100 uplink. Clearly, with external transverters it could be used on any band.

When used with the Portsdown 4, the Muntjac will transmit DVB-S2 QPSK with symbol rates of 125, 250, 333.333, 500 and 1000 kS. It will also transmit DVB-S2 8PSK with symbol rates of 125, 250, 333.333 and 500 kS. DVB-S is not supported.

Transmit data is sent to the AT chip at 128M bits/s on an LVDS bus. This is 4M x 13bit IQ samples/s, with 4 times oversampling, which limits the symbol rate to 1000k symbols/s.

The output power setting parameter (gain) range of the AT86RF215 is 0-31, with each step being nominally 1dB and power zero being -15dBm.

When selecting power on the Portsdown screen, this parameter is restricted to a maximum of 20, as the shoulders on the output increase rapidly above this.

At power setting 20, shoulders on the output are at least 30dB down and are further down at lower output powers. Approximate output power is shown in the table below.

{| class="wikitable"
|+ Muntjac Performance
|-
! Gain Setting !! 437 MHz O/P !! 437 MHz Shoulders !! 2409 MHz O/P !! 2409 MHz Shoulders
|-
| 20 || +5.6 dBm || -34 dB || +4.1 dBm || -30 dB
|-
| 19 || +4.8 dBm || || +3.7 dBm ||
|-
| 18 || +4.0 dBm || || +2.8 dBm ||
|-
| 17 || +3.0 dBm || || +2.1 dBm ||
|-
| 16 || +2.1 dBm || || +1.2 dBm ||
|-
| 15 || +0.8 dBm || -40 dB || +0.5 dBm || -40 dB
|-
| 14 || +0.1 dBm || || -0.5 dBm ||
|-
| 13 || -0.9 dBm || || -1.4 dBm ||
|-
| 12 || -1.9 dBm || || -2.5 dBm ||
|-
| 11 || -2.6 dBm || || -3.3 dBm ||
|-
| 10 || -3.6 dBm || -50 dB || -4.4 dBm || -43 dB
|-
| 9 || -4.7 dBm || || -5.3 dBm ||
|-
| 8 || -5.7 dBm || || -6.3 dBm ||
|-
| 7 || -6.4 dBm || || -7.3 dBm ||
|-
| 6 || -7.4 dBm || || -8.3 dBm ||
|-
| 5 || -8.4 dBm || < -50 dB || -9.3 dBm || < -45 dB
|-
| 4 || -9.4 dBm || || -10.3 dBm ||
|-
| 3 || -10.2 dBm || || -11.1 dBm ||
|-
| 2 || -11.2 dBm || || -12.1 dBm ||
|-
| 1 || -12.2 dBm || || -13.1 dBm ||
|-
| 0 || -13.2 dBm || < -50 dB || -14.1 dBm || < -45 dB
|}

The output power at 900 MHz is typically 3 dB less than that at 437 MHz.

===Preparing for Use===

The Muntjac is supplied as a kit with the final assembly step of soldering the output connectors to the PCB required for completion. The SMA connectors are not supplied. If the SDR is to be mounted in a box (it does fit a small die-cast box) right-angle SMAs with long shafts should be used to allow sufficient clearance between the SMA plug and the box. An suitable example connector is this:
https://www.mouser.co.uk/ProductDetail/TE-Connectivity-Linx-Technologies/CONSMA002-L-G?qs=vLWxofP3U2xfxfFnu8BdmA%3D%3D

[[File:SMA Connector.png|200px]]

Cheaper suitable connectors are available on eBay.

An example of the Muntjac mounted in a box (with short SMA Conectors) is shown here.

[[File:Muntjac boxed.jpg|400px]]

===Another Boxing Idea===

As Muntjac-4 was meant to be an intermediate development version, not much thought was given to fitting it into a box.

The Hammond 1550P can be used by cutting slots into the top edges of the box and dropping in the Muntjac-4 board vertically.

The 1550P is about £6 in bare metal and about double that as the 1550PBK with a black finish.

[[File:Mj1550p.png|400px]]

===Using Muntjac with the Portsdown 4===

The Muntjac connects to the Portsdown by USB. No other power supply is required. The Muntjac drivers are included in the latest Portsdown 4 software, so make sure that your Portsdown is up to date using Menu 3 and 'Check for Update'. If the Muntjac is connected to the Portsdown, disconnect it before updating.

The first time you use each Muntjac device, it needs to be registered so that the Raspberry Pi recognises it at the next reboot. After connecting a "new" Muntjac to your Portsdown 4, select "Output to" and then "Muntjac". If "Output to" is already set to "Muntjac", select "Output to" and then "Muntjac" again. A message will pop up saying "System will reboot now to register new Muntjac. Touch screen to continue". Touch the screen, and after the reboot, your Muntjac is ready for use. This procedure also copies any published calibration file (see below) to the correct folder for use

You will not need to repeat this process unless you connect a different Muntjac, or you use a different Portsdown.

Next, set the Muntjac gain with reference to the table above. Then connect the correct output to your transmit amplifier; the low band output is used for 437 MHz (and 900 MHz) and the high band output is used for 2400 MHz. The high band output is to the north of the "Muntjac-4" legend.

Within the limitations above, the Muntjac behaves similarly to a LimeSDR Mini.

===LEDs===

There is a main LED near the buttons and an LED near each SMA socket.

The main LED blinks 'HI' in morse (.... ..) at power up. This is for software version 1v0b. Later versions will blink 'MJ' and the last letter of the software version.

The LED near each SMA socket is normally off and lights when that band (low or high) is in use.

The main LED is normally on and blinks off 1 / 2 / 3 times depending on whether low / high / both bands are active.

If the main LED blinks quickly and continuously, this indicates a Muntjac error and it is waiting for the USB data feed from the Portsdown to be stopped.

The main LED output is also available on the 12 pin J4 socket position, for mounting on a box. Pin 11 is ground and pin 12 is for the +ve end of an LED, through a suitable resistor.

Pin 1 of J4 is the square pad and odd numbered pins are along the edge of the board.

===First Transmission===

If you're not familiar with the Portsdown, set the lines starting 'Modulation', 'Freq' and 'EasyCap' as shown and enter your callsign via 'Menu 3' and 'Set Call, Loc & PIDs'.

[[File:Pdmainscreen1.png|400px]]

Press 'TX' and after a second or two, the Muntjac main LED near the buttons will start double blinking off and the LED near the high band SMA will light steady.

===Monitoring Muntjac Driver Operation===

The Muntjac driver (muntjacsdr_dvb) on the Portsdown outputs a log to a UDP network port. To see this, log into the Portsdown with ssh and type:

nc -kluv 9979

===Lack of Calibration Spikes===

The AT86RF215 chip does a self calibration before transmitting, but it does this with its final amplifier turned off, so it is not necessary to isolate the output for a number of seconds as with the Pluto and Lime. This is the observation so far, but it's early days for the project, so verify this for yourself.

===IQ Calibration===

Poor IQ balance in an SDR can cause a carrier (the local oscillator) to be transmitted at the centre frequency of a DATV transmission. This causes a reduction in received MER. The reduction is most noticeable at high MER, but it will not affect reception, because the MER is already high. It seems to have less effect when the MER is comparatively low, as on QO-100. It just looks wrong to see a spike in the middle of your signal.

The AT86RF215 chip does an IQ balance as part of its self calibration before transmitting, but it doesn't always do the best job. Fortunately there are registers in the chip which can be adjusted to improve the local oscillator suppression. The required register values vary with the power setting, although not very much within each group of four power settings, so calibration values are only required for power settings 0, 4, 8, 12, 16, 20, 24, 28.

Some Muntjacs may have been calibrated before sale. The calibration files for these are included in the latest Portsdown software, and the correct file is loaded when the Muntjac is registered using the procedure above. However, some may not have been factory calibrated (although they will have been tested). They will function perfectly well for DATV without this file. A tool is under development to enable the Muntjac calibration file to be generated by the user.

The Muntjac calibration file has a file name of the format E46214B063533828.mjo where the E number is the flash ID of the RP2040 chip. A file of the correct format with the correct name in the /home/pi/rpidatv/bin/ folder is automatically read by the Muntjac driver and the settings applied. The library of files is in the folder /home/pi/rpidatv/src/muntjac. If you would like your calibration file added to this library, please e-mail it to G8GKQ. An example file can be found at https://github.com/davecrump/portsdown4/blob/master/src/muntjac/E46214B063533828.mjo.

===Output Filtering===

The low band output must be bandpass filtered.

The high band output uses a combined bandpass and notch filter balun, specially designed for the AT86RF215, so additional filtering should not be necessary.

If the low band output is also active, additional filtering on the high band output may be required, to address any feedthrough from the low band output and its harmonics.

https://www.johansontechnology.com/docs/796/2450FB15A050_VdAqien.pdf

===Frequency Accuracy===

The AT86RF215 uses an externally connected 26MHz TXCO on the pcb, with a temperature stability of 0.5ppm and initial accuracy of +/- 2ppm. The 2.4GHz output should be within a few kHz of nominal.

https://aker-usa.com/spec/TX21.pdf

===Shoulders at Various Power Settings===

The plots below show the effect of the power setting on the level of the shoulders at SR333. Shoulders are generally lower on 437MHz for the same power setting.

[[File:Snap80a.jpg|400px]] [[File:Snap76b.jpg|400px]]

[[File:Snap75c.jpg|400px]] [[File:Snap77d.jpg|400px]]

The rising levels at the edges of the plots are an artefact of the Pluto band viewer, as shown by the PWR8 plot in a 10MHz bandwidth.

[[File:Snap78e.jpg|400px]]

===Programming the Microcontroller on the Muntjac===

Muntjacs are provided pre-programmed by the BATC Shop, but this is the procedure to load a firmware update if required.

1. Locate the latest compiled firmware file 'muntjac4_pico-1v**.uf2' which will be found here https://github.com/davecrump/portsdown4/blob/master/src/muntjac/muntjac4_pico-1v0p.uf2 and save it to your desktop.

2. Hold down the BT button (the one nearest the SMA sockets) on the Muntjac while connecting it to your PC using its USB port. The Pico Muntjac appears as a USB disk drive on your PC.

3. Copy the .uf2 file onto the USB drive. The Muntjac will recognise the file and immediately update its firmware, reboot and the PC should recognise a new USB COM device. The main LED on the Muntjac will blink in morse as it reboots. This will be 'HI' for firmware version 1v0b and "MJ" plus the last letter of the firmware version for later versions of the firmware.

4. Disconnect the Muntjac from the PC and connect it to the Portsdown. Make sure that the Muntjac is selected as the Output Device and then Select M2, Info. The Muntjac firmware version will be displayed along with the Muntjac Flash ID.

===Alternative Method of Putting the Microcontroller into Firmware Update Mode===

This may be useful if you've built the Muntjac into a box and cannot easily get to its buttons.

1. Plug the Muntjac into a PC and it will appear as a COM port. Note that this may not work through a USB3 hub.

2. Find the COM port number in device manager and open a serial terminal session to that COM port at 1200 baud, with a terminal program such as putty.

3. The COM port will instantly disappear and the Muntjac will then appear as a USB drive.

4. Proceed with step 3 in the section above.

Note that this depends on the software already in the Muntjac being configured to do this. This approach would not work on a blank Raspberry Pi Pico board, which uses the same RP2040 microcontroller as the Muntjac.

[[File:MJputty1.png|400px]]

===Mixing Options===

As both high and low band outputs may be active at the same time, this gives some options for using a mixer to transvert to other bands.

The same DATV transmission can be made simultaneously on both bands (but NOT from a Portsdown menu), but either band can output a carrier instead and the third harmonic of the low band output can be used to mix the high band output to various frequencies.

These notes are to guide experimentation. Some of the high band frequencies are outside the published specification of the AT86RF215 chip (2400-2483.5MHz). The output must be monitored for quality, stability and frequency accuracy.

Any mixer output MUST be bandpass filtered for the required output frequency. This is particularly important for 23cm, where on 1270MHz for example, the required third harmonic of the low band carrier may be only 58MHz away from the target frequency.

The low band carrier power is set at 26, which is nominally +11dBm. If a passive mixer is used, a Level7 (7dBm local oscillator) mixer is recommended. A suitable mixer is a MiniCircuits ADE-30+ (NOT the ADE-30W+, although that may be more suitable depending on your requirements). https://www.minicircuits.com/pdfs/ADE-30+.pdf

The high and low band outputs are connected to the RF and LO ports of the mixer, which are specced at 200-3000MHz and the output is taken from the IF port, which is specced at 0-1000MHz. The output is likely to be in the range of the tens of microwatts. The 23cm band is outside the IF range, but still produces a usable output.

The following frequency ranges are built into the Muntjac driver in the Portsdown. Putting the target frequency into Portsdown will automatically select the correct high and low band frequencies for mixing.

{| class="wikitable"
|+ Mixing Options
|-
! Output !! Low !! Harmonic !! High
|-
| 3400-3410 || 1010 || - || 2390-2400
|-
| 1300-1305 || 395 || 1185 || 2395-2400
|-
| 1270-1280 || 404 || 1212 || 2482-2492
|-
| 1244-1250 || 390 || 1170 || 2414-2420
|-
| 144-147 || 780 || 2340 || 2484-2487
|-
| 70.5-71.5 || 805 || 2415 || 2485.5-2486.5
|-
| 50-54 || 812 || 2436 || 2486-2490
|-
| 28-30 || 819 || 2457 || 2483-2485
|}

===Fitting and Using the Onboard Mixer===

Details will appear here.

===Using the Third Harmonic of the Low Band for DATV on 23cm===

The third hamonic of 418.333 MHz can be used to transmit on 1255 MHz. The third harmonic is about 20 dB down on the fundamental, so good filtering is required. More details will appear here.

[[File:Third Harmonic.jpg|400px]]
''The fundamental at 418.3 MHz on the left with the 3rd hamonic on 1255 MHz on the right''

===Command Line Operation===

This gives full control over frequency and power on both high and low band simultaneously and enables Portsdown band viewer to be run at the same time.

Details will appear here.

===Muntjac Schematic===

Downloadable PDF files will be available shortly.

[[File:Image 2026-04-28 12-58-03.png|1080px]]

===Muntjac Input/Output Connectors===

The 40 pin J101 position will allow the Muntjac to connect directly to a Raspberry Pi. This will provide power and also an SPI link, which will allow higher data rates for future development. It is recommended that no connector is fitted here until the required orientation and gender is known.

The 8 pin J3 position can be used for general I/O or to allow future developments to connect a WIZnet Ethernet module for applications that do not require a Raspberry Pi.

The 12 pin J4 position is for general I/O.

3.3v power is available on J3 and J4. The available current is yet to be determined.

All Muntjac I/O pins on J3 and J4 are connected directly to the RP2040 microcontroller, so caution should be exercised regarding static and voltage levels. 3.3v is the nominal voltage level.

There are no pins on J3 or J4 that connect to J101.

===Problems===

The Muntjac may not be seen as a USB COM port when connected to a USB3 hub. The USB3 sockets on the RPi4 are not a problem. However, it will appear as a virtual USB drive for software update when connected to a USB3 hub, which is odd.

File:Third Harmonic.jpg

2026-04-28T12:50:32Z

G8GKQ: File uploaded with MsUpload

File uploaded with MsUpload

The Muntjac SDR

2026-04-28T09:09:14Z

G8GKQ: /* Monitoring Muntjac Driver Operation */

The Muntjac SDR was designed by Brian G4EWJ based on the same dual-band AT86RF215 RF chip as the commercially available CaribouLite SDR.

It is a transmit-only SDR for DVB-S2 DATV on 13cm (QO-100) and 70cm, which uses an RP2040 micro-controller, as used on the Raspberry Pi Pico, to provide a USB interface to the Portsdown 4.

When operating from the command line, the same transmission may be made on both bands simultaneously.

The 75 x 30mm board comes without SMA connectors, so that it can optionally be wired into a system, for maximum flexibility. Long thread SMA types are recommended.

The optional user-fitted ADE-30+ mixer is shown, which can be used for experiments on other bands. DATV is generated on the high band and mixed with the harmonic of a carrier on the low band. In theory, output on all bands from 1.8MHz to 3.4GHz is possible, but this is subject to further investigation.

Muntjac-4 was meant to be intermediate development version, but it is working well enough to make it available as part of an extended beta trial. Some configuration in Linux may be necessary, so if you don't consider yourself to be an 'early-adopter' it may be worth waiting until it has matured.

Please put any comments, questions or problems on the BATC Muntjac forum: '''https://forum.batc.org.uk/viewforum.php?f=148'''

[[File:cqtvmj25-1a.jpg|400px]] [[File:cqtvmj25-2a.jpg|400px]]

 
 

===Specifications===

The Muntjac SDR only operates with output frequencies in the following ranges: 390 - 510 MHz, 779- 1020 MHz and 2400 - 2483 MHz. Individual examples may operate slightly outside these frequency ranges, but not significantly. For our use, this means that the Muntjac can only be used directly on 70 cm and the QO-100 uplink. Clearly, with external transverters it could be used on any band.

When used with the Portsdown 4, the Muntjac will transmit DVB-S2 QPSK with symbol rates of 125, 250, 333.333, 500 and 1000 kS. It will also transmit DVB-S2 8PSK with symbol rates of 125, 250, 333.333 and 500 kS. DVB-S is not supported.

Transmit data is sent to the AT chip at 128M bits/s on an LVDS bus. This is 4M x 13bit IQ samples/s, with 4 times oversampling, which limits the symbol rate to 1000k symbols/s.

The output power setting parameter (gain) range of the AT86RF215 is 0-31, with each step being nominally 1dB and power zero being -15dBm.

When selecting power on the Portsdown screen, this parameter is restricted to a maximum of 20, as the shoulders on the output increase rapidly above this.

At power setting 20, shoulders on the output are at least 30dB down and are further down at lower output powers. Approximate output power is shown in the table below.

{| class="wikitable"
|+ Muntjac Performance
|-
! Gain Setting !! 437 MHz O/P !! 437 MHz Shoulders !! 2409 MHz O/P !! 2409 MHz Shoulders
|-
| 20 || +5.6 dBm || -34 dB || +4.1 dBm || -30 dB
|-
| 19 || +4.8 dBm || || +3.7 dBm ||
|-
| 18 || +4.0 dBm || || +2.8 dBm ||
|-
| 17 || +3.0 dBm || || +2.1 dBm ||
|-
| 16 || +2.1 dBm || || +1.2 dBm ||
|-
| 15 || +0.8 dBm || -40 dB || +0.5 dBm || -40 dB
|-
| 14 || +0.1 dBm || || -0.5 dBm ||
|-
| 13 || -0.9 dBm || || -1.4 dBm ||
|-
| 12 || -1.9 dBm || || -2.5 dBm ||
|-
| 11 || -2.6 dBm || || -3.3 dBm ||
|-
| 10 || -3.6 dBm || -50 dB || -4.4 dBm || -43 dB
|-
| 9 || -4.7 dBm || || -5.3 dBm ||
|-
| 8 || -5.7 dBm || || -6.3 dBm ||
|-
| 7 || -6.4 dBm || || -7.3 dBm ||
|-
| 6 || -7.4 dBm || || -8.3 dBm ||
|-
| 5 || -8.4 dBm || < -50 dB || -9.3 dBm || < -45 dB
|-
| 4 || -9.4 dBm || || -10.3 dBm ||
|-
| 3 || -10.2 dBm || || -11.1 dBm ||
|-
| 2 || -11.2 dBm || || -12.1 dBm ||
|-
| 1 || -12.2 dBm || || -13.1 dBm ||
|-
| 0 || -13.2 dBm || < -50 dB || -14.1 dBm || < -45 dB
|}

The output power at 900 MHz is typically 3 dB less than that at 437 MHz.

===Preparing for Use===

The Muntjac is supplied as a kit with the final assembly step of soldering the output connectors to the PCB required for completion. The SMA connectors are not supplied. If the SDR is to be mounted in a box (it does fit a small die-cast box) right-angle SMAs with long shafts should be used to allow sufficient clearance between the SMA plug and the box. An suitable example connector is this:
https://www.mouser.co.uk/ProductDetail/TE-Connectivity-Linx-Technologies/CONSMA002-L-G?qs=vLWxofP3U2xfxfFnu8BdmA%3D%3D

[[File:SMA Connector.png|200px]]

Cheaper suitable connectors are available on eBay.

An example of the Muntjac mounted in a box (with short SMA Conectors) is shown here.

[[File:Muntjac boxed.jpg|400px]]

===Another Boxing Idea===

As Muntjac-4 was meant to be an intermediate development version, not much thought was given to fitting it into a box.

The Hammond 1550P can be used by cutting slots into the top edges of the box and dropping in the Muntjac-4 board vertically.

The 1550P is about £6 in bare metal and about double that as the 1550PBK with a black finish.

[[File:Mj1550p.png|400px]]

===Using Muntjac with the Portsdown 4===

The Muntjac connects to the Portsdown by USB. No other power supply is required. The Muntjac drivers are included in the latest Portsdown 4 software, so make sure that your Portsdown is up to date using Menu 3 and 'Check for Update'. If the Muntjac is connected to the Portsdown, disconnect it before updating.

The first time you use each Muntjac device, it needs to be registered so that the Raspberry Pi recognises it at the next reboot. After connecting a "new" Muntjac to your Portsdown 4, select "Output to" and then "Muntjac". If "Output to" is already set to "Muntjac", select "Output to" and then "Muntjac" again. A message will pop up saying "System will reboot now to register new Muntjac. Touch screen to continue". Touch the screen, and after the reboot, your Muntjac is ready for use. This procedure also copies any published calibration file (see below) to the correct folder for use

You will not need to repeat this process unless you connect a different Muntjac, or you use a different Portsdown.

Next, set the Muntjac gain with reference to the table above. Then connect the correct output to your transmit amplifier; the low band output is used for 437 MHz (and 900 MHz) and the high band output is used for 2400 MHz. The high band output is to the north of the "Muntjac-4" legend.

Within the limitations above, the Muntjac behaves similarly to a LimeSDR Mini.

===LEDs===

There is a main LED near the buttons and an LED near each SMA socket.

The main LED blinks 'HI' in morse (.... ..) at power up. This is for software version 1v0b. Later versions will blink 'MJ' and the last letter of the software version.

The LED near each SMA socket is normally off and lights when that band (low or high) is in use.

The main LED is normally on and blinks off 1 / 2 / 3 times depending on whether low / high / both bands are active.

If the main LED blinks quickly and continuously, this indicates a Muntjac error and it is waiting for the USB data feed from the Portsdown to be stopped.

The main LED output is also available on the 12 pin J4 socket position, for mounting on a box. Pin 11 is ground and pin 12 is for the +ve end of an LED, through a suitable resistor.

Pin 1 of J4 is the square pad and odd numbered pins are along the edge of the board.

===First Transmission===

If you're not familiar with the Portsdown, set the lines starting 'Modulation', 'Freq' and 'EasyCap' as shown and enter your callsign via 'Menu 3' and 'Set Call, Loc & PIDs'.

[[File:Pdmainscreen1.png|400px]]

Press 'TX' and after a second or two, the Muntjac main LED near the buttons will start double blinking off and the LED near the high band SMA will light steady.

===Monitoring Muntjac Driver Operation===

The Muntjac driver (muntjacsdr_dvb) on the Portsdown outputs a log to a UDP network port. To see this, log into the Portsdown with ssh and type:

nc -kluv 9979

===Lack of Calibration Spikes===

The AT86RF215 chip does a self calibration before transmitting, but it does this with its final amplifier turned off, so it is not necessary to isolate the output for a number of seconds as with the Pluto and Lime. This is the observation so far, but it's early days for the project, so verify this for yourself.

===IQ Calibration===

Poor IQ balance in an SDR can cause a carrier (the local oscillator) to be transmitted at the centre frequency of a DATV transmission. This causes a reduction in received MER. The reduction is most noticeable at high MER, but it will not affect reception, because the MER is already high. It seems to have less effect when the MER is comparatively low, as on QO-100. It just looks wrong to see a spike in the middle of your signal.

The AT86RF215 chip does an IQ balance as part of its self calibration before transmitting, but it doesn't always do the best job. Fortunately there are registers in the chip which can be adjusted to improve the local oscillator suppression. The required register values vary with the power setting, although not very much within each group of four power settings, so calibration values are only required for power settings 0, 4, 8, 12, 16, 20, 24, 28.

Some Muntjacs may have been calibrated before sale. The calibration files for these are included in the latest Portsdown software, and the correct file is loaded when the Muntjac is registered using the procedure above. However, some may not have been factory calibrated (although they will have been tested). They will function perfectly well for DATV without this file. A tool is under development to enable the Muntjac calibration file to be generated by the user.

The Muntjac calibration file has a file name of the format E46214B063533828.mjo where the E number is the flash ID of the RP2040 chip. A file of the correct format with the correct name in the /home/pi/rpidatv/bin/ folder is automatically read by the Muntjac driver and the settings applied. The library of files is in the folder /home/pi/rpidatv/src/muntjac. If you would like your calibration file added to this library, please e-mail it to G8GKQ. An example file can be found at https://github.com/davecrump/portsdown4/blob/master/src/muntjac/E46214B063533828.mjo.

===Output Filtering===

The low band output must be bandpass filtered.

The high band output uses a combined bandpass and notch filter balun, specially designed for the AT86RF215, so additional filtering should not be necessary.

If the low band output is also active, additional filtering on the high band output may be required, to address any feedthrough from the low band output and its harmonics.

https://www.johansontechnology.com/docs/796/2450FB15A050_VdAqien.pdf

===Frequency Accuracy===

The AT86RF215 uses an externally connected 26MHz TXCO on the pcb, with a temperature stability of 0.5ppm and initial accuracy of +/- 2ppm. The 2.4GHz output should be within a few kHz of nominal.

https://aker-usa.com/spec/TX21.pdf

===Shoulders at Various Power Settings===

The plots below show the effect of the power setting on the level of the shoulders at SR333. Shoulders are generally lower on 437MHz for the same power setting.

[[File:Snap80a.jpg|400px]] [[File:Snap76b.jpg|400px]]

[[File:Snap75c.jpg|400px]] [[File:Snap77d.jpg|400px]]

The rising levels at the edges of the plots are an artefact of the Pluto band viewer, as shown by the PWR8 plot in a 10MHz bandwidth.

[[File:Snap78e.jpg|400px]]

===Programming the Microcontroller on the Muntjac===

Muntjacs are provided pre-programmed by the BATC Shop, but this is the procedure to load a firmware update if required.

1. Locate the latest compiled firmware file 'muntjac4_pico-1v**.uf2' which will be found here https://github.com/davecrump/portsdown4/blob/master/src/muntjac/muntjac4_pico-1v0p.uf2 and save it to your desktop.

2. Hold down the BT button (the one nearest the SMA sockets) on the Muntjac while connecting it to your PC using its USB port. The Pico Muntjac appears as a USB disk drive on your PC.

3. Copy the .uf2 file onto the USB drive. The Muntjac will recognise the file and immediately update its firmware, reboot and the PC should recognise a new USB COM device. The main LED on the Muntjac will blink in morse as it reboots. This will be 'HI' for firmware version 1v0b and "MJ" plus the last letter of the firmware version for later versions of the firmware.

4. Disconnect the Muntjac from the PC and connect it to the Portsdown. Make sure that the Muntjac is selected as the Output Device and then Select M2, Info. The Muntjac firmware version will be displayed along with the Muntjac Flash ID.

===Alternative Method of Putting the Microcontroller into Firmware Update Mode===

This may be useful if you've built the Muntjac into a box and cannot easily get to its buttons.

1. Plug the Muntjac into a PC and it will appear as a COM port. Note that this may not work through a USB3 hub.

2. Find the COM port number in device manager and open a serial terminal session to that COM port at 1200 baud, with a terminal program such as putty.

3. The COM port will instantly disappear and the Muntjac will then appear as a USB drive.

4. Proceed with step 3 in the section above.

Note that this depends on the software already in the Muntjac being configured to do this. This approach would not work on a blank Raspberry Pi Pico board, which uses the same RP2040 microcontroller as the Muntjac.

[[File:MJputty1.png|400px]]

===Mixing Options===

As both high and low band outputs may be active at the same time, this gives some options for using a mixer to transvert to other bands.

The same DATV transmission can be made simultaneously on both bands (but NOT from a Portsdown menu), but either band can output a carrier instead and the third harmonic of the low band output can be used to mix the high band output to various frequencies.

These notes are to guide experimentation. Some of the high band frequencies are outside the published specification of the AT86RF215 chip (2400-2483.5MHz). The output must be monitored for quality, stability and frequency accuracy.

Any mixer output MUST be bandpass filtered for the required output frequency. This is particularly important for 23cm, where on 1270MHz for example, the required third harmonic of the low band carrier may be only 58MHz away from the target frequency.

The low band carrier power is set at 26, which is nominally +11dBm. If a passive mixer is used, a Level7 (7dBm local oscillator) mixer is recommended. A suitable mixer is a MiniCircuits ADE-30+ (NOT the ADE-30W+, although that may be more suitable depending on your requirements). https://www.minicircuits.com/pdfs/ADE-30+.pdf

The high and low band outputs are connected to the RF and LO ports of the mixer, which are specced at 200-3000MHz and the output is taken from the IF port, which is specced at 0-1000MHz. The output is likely to be in the range of the tens of microwatts. The 23cm band is outside the IF range, but still produces a usable output.

The following frequency ranges are built into the Muntjac driver in the Portsdown. Putting the target frequency into Portsdown will automatically select the correct high and low band frequencies for mixing.

{| class="wikitable"
|+ Mixing Options
|-
! Output !! Low !! Harmonic !! High
|-
| 3400-3410 || 1010 || - || 2390-2400
|-
| 1300-1305 || 395 || 1185 || 2395-2400
|-
| 1270-1280 || 404 || 1212 || 2482-2492
|-
| 1244-1250 || 390 || 1170 || 2414-2420
|-
| 144-147 || 780 || 2340 || 2484-2487
|-
| 70.5-71.5 || 805 || 2415 || 2485.5-2486.5
|-
| 50-54 || 812 || 2436 || 2486-2490
|-
| 28-30 || 819 || 2457 || 2483-2485
|}

===Fitting and Using the Onboard Mixer===

Details will appear here.

===Using the Third Harmonic of the Low Band for DATV on 23cm===

Details will appear here.

===Command Line Operation===

This gives full control over frequency and power on both high and low band simultaneously and enables Portsdown band viewer to be run at the same time.

Details will appear here.

===Problems===

The Muntjac may not be seen as a USB COM port when connected to a USB3 hub. The USB3 sockets on the RPi4 are not a problem. However, it will appear as a virtual USB drive for software update when connected to a USB3 hub, which is odd.

The Muntjac SDR

2026-04-27T19:41:58Z

G8GKQ: /* Programming the Microcontroller on the Muntjac */

The Muntjac SDR was designed by Brian G4EWJ based on the same dual-band AT86RF215 RF chip as the commercially available CaribouLite SDR.

It is a transmit-only SDR for DVB-S2 DATV on 13cm (QO-100) and 70cm, which uses an RP2040 micro-controller, as used on the Raspberry Pi Pico, to provide a USB interface to the Portsdown 4.

When operating from the command line, the same transmission may be made on both bands simultaneously.

The 75 x 30mm board comes without SMA connectors, so that it can optionally be wired into a system, for maximum flexibility. Long thread SMA types are recommended.

The optional user-fitted ADE-30+ mixer is shown, which can be used for experiments on other bands. DATV is generated on the high band and mixed with the harmonic of a carrier on the low band. In theory, output on all bands from 1.8MHz to 3.4GHz is possible, but this is subject to further investigation.

Muntjac-4 was meant to be intermediate development version, but it is working well enough to make it available as part of an extended beta trial. Some configuration in Linux may be necessary, so if you don't consider yourself to be an 'early-adopter' it may be worth waiting until it has matured.

Please put any comments, questions or problems on the BATC Muntjac forum: '''https://forum.batc.org.uk/viewforum.php?f=148'''

[[File:cqtvmj25-1a.jpg|400px]] [[File:cqtvmj25-2a.jpg|400px]]

 
 

===Specifications===

The Muntjac SDR only operates with output frequencies in the following ranges: 390 - 510 MHz, 779- 1020 MHz and 2400 - 2483 MHz. Individual examples may operate slightly outside these frequency ranges, but not significantly. For our use, this means that the Muntjac can only be used directly on 70 cm and the QO-100 uplink. Clearly, with external transverters it could be used on any band.

When used with the Portsdown 4, the Muntjac will transmit DVB-S2 QPSK with symbol rates of 125, 250, 333.333, 500 and 1000 kS. It will also transmit DVB-S2 8PSK with symbol rates of 125, 250, 333.333 and 500 kS. DVB-S is not supported.

Transmit data is sent to the AT chip at 128M bits/s on an LVDS bus. This is 4M x 13bit IQ samples/s, with 4 times oversampling, which limits the symbol rate to 1000k symbols/s.

The output power setting parameter (gain) range of the AT86RF215 is 0-31, with each step being nominally 1dB and power zero being -15dBm.

When selecting power on the Portsdown screen, this parameter is restricted to a maximum of 20, as the shoulders on the output increase rapidly above this.

At power setting 20, shoulders on the output are at least 30dB down and are further down at lower output powers. Approximate output power is shown in the table below.

{| class="wikitable"
|+ Muntjac Performance
|-
! Gain Setting !! 437 MHz O/P !! 437 MHz Shoulders !! 2409 MHz O/P !! 2409 MHz Shoulders
|-
| 20 || +5.6 dBm || -34 dB || +4.1 dBm || -30 dB
|-
| 19 || +4.8 dBm || || +3.7 dBm ||
|-
| 18 || +4.0 dBm || || +2.8 dBm ||
|-
| 17 || +3.0 dBm || || +2.1 dBm ||
|-
| 16 || +2.1 dBm || || +1.2 dBm ||
|-
| 15 || +0.8 dBm || -40 dB || +0.5 dBm || -40 dB
|-
| 14 || +0.1 dBm || || -0.5 dBm ||
|-
| 13 || -0.9 dBm || || -1.4 dBm ||
|-
| 12 || -1.9 dBm || || -2.5 dBm ||
|-
| 11 || -2.6 dBm || || -3.3 dBm ||
|-
| 10 || -3.6 dBm || -50 dB || -4.4 dBm || -43 dB
|-
| 9 || -4.7 dBm || || -5.3 dBm ||
|-
| 8 || -5.7 dBm || || -6.3 dBm ||
|-
| 7 || -6.4 dBm || || -7.3 dBm ||
|-
| 6 || -7.4 dBm || || -8.3 dBm ||
|-
| 5 || -8.4 dBm || < -50 dB || -9.3 dBm || < -45 dB
|-
| 4 || -9.4 dBm || || -10.3 dBm ||
|-
| 3 || -10.2 dBm || || -11.1 dBm ||
|-
| 2 || -11.2 dBm || || -12.1 dBm ||
|-
| 1 || -12.2 dBm || || -13.1 dBm ||
|-
| 0 || -13.2 dBm || < -50 dB || -14.1 dBm || < -45 dB
|}

The output power at 900 MHz is typically 3 dB less than that at 437 MHz.

===Preparing for Use===

The Muntjac is supplied as a kit with the final assembly step of soldering the output connectors to the PCB required for completion. The SMA connectors are not supplied. If the SDR is to be mounted in a box (it does fit a small die-cast box) right-angle SMAs with long shafts should be used to allow sufficient clearance between the SMA plug and the box. An suitable example connector is this:
https://www.mouser.co.uk/ProductDetail/TE-Connectivity-Linx-Technologies/CONSMA002-L-G?qs=vLWxofP3U2xfxfFnu8BdmA%3D%3D

[[File:SMA Connector.png|200px]]

Cheaper suitable connectors are available on eBay.

An example of the Muntjac mounted in a box (with short SMA Conectors) is shown here.

[[File:Muntjac boxed.jpg|400px]]

===Another Boxing Idea===

As Muntjac-4 was meant to be an intermediate development version, not much thought was given to fitting it into a box.

The Hammond 1550P can be used by cutting slots into the top edges of the box and dropping in the Muntjac-4 board vertically.

The 1550P is about £6 in bare metal and about double that as the 1550PBK with a black finish.

[[File:Mj1550p.png|400px]]

===Using Muntjac with the Portsdown 4===

The Muntjac connects to the Portsdown by USB. No other power supply is required. The Muntjac drivers are included in the latest Portsdown 4 software, so make sure that your Portsdown is up to date using Menu 3 and 'Check for Update'. If the Muntjac is connected to the Portsdown, disconnect it before updating.

The first time you use each Muntjac device, it needs to be registered so that the Raspberry Pi recognises it at the next reboot. After connecting a "new" Muntjac to your Portsdown 4, select "Output to" and then "Muntjac". If "Output to" is already set to "Muntjac", select "Output to" and then "Muntjac" again. A message will pop up saying "System will reboot now to register new Muntjac. Touch screen to continue". Touch the screen, and after the reboot, your Muntjac is ready for use. This procedure also copies any published calibration file (see below) to the correct folder for use

You will not need to repeat this process unless you connect a different Muntjac, or you use a different Portsdown.

Next, set the Muntjac gain with reference to the table above. Then connect the correct output to your transmit amplifier; the low band output is used for 437 MHz (and 900 MHz) and the high band output is used for 2400 MHz. The high band output is to the north of the "Muntjac-4" legend.

Within the limitations above, the Muntjac behaves similarly to a LimeSDR Mini.

===LEDs===

There is a main LED near the buttons and an LED near each SMA socket.

The main LED blinks 'HI' in morse (.... ..) at power up. This is for software version 1v0b. Later versions will blink 'MJ' and the last letter of the software version.

The LED near each SMA socket is normally off and lights when that band (low or high) is in use.

The main LED is normally on and blinks off 1 / 2 / 3 times depending on whether low / high / both bands are active.

If the main LED blinks quickly and continuously, this indicates a Muntjac error and it is waiting for the USB data feed from the Portsdown to be stopped.

The main LED output is also available on the 12 pin J4 socket position, for mounting on a box. Pin 11 is ground and pin 12 is for the +ve end of an LED, through a suitable resistor.

Pin 1 of J4 is the square pad and odd numbered pins are along the edge of the board.

===First Transmission===

If you're not familiar with the Portsdown, set the lines starting 'Modulation', 'Freq' and 'EasyCap' as shown and enter your callsign via 'Menu 3' and 'Set Call, Loc & PIDs'.

[[File:Pdmainscreen1.png|400px]]

Press 'TX' and after a second or two, the Muntjac main LED near the buttons will start double blinking off and the LED near the high band SMA will light steady.

===Monitoring Muntjac Driver Operation===

The Muntjac driver (muntjacsdr_dvb) on the Portsdown outputs a log to a UDP network port. To see this, log into the Portsdown with ssh and type:

'''nc -kluv 9979'''

===Lack of Calibration Spikes===

The AT86RF215 chip does a self calibration before transmitting, but it does this with its final amplifier turned off, so it is not necessary to isolate the output for a number of seconds as with the Pluto and Lime. This is the observation so far, but it's early days for the project, so verify this for yourself.

===IQ Calibration===

Poor IQ balance in an SDR can cause a carrier (the local oscillator) to be transmitted at the centre frequency of a DATV transmission. This causes a reduction in received MER. The reduction is most noticeable at high MER, but it will not affect reception, because the MER is already high. It seems to have less effect when the MER is comparatively low, as on QO-100. It just looks wrong to see a spike in the middle of your signal.

The AT86RF215 chip does an IQ balance as part of its self calibration before transmitting, but it doesn't always do the best job. Fortunately there are registers in the chip which can be adjusted to improve the local oscillator suppression. The required register values vary with the power setting, although not very much within each group of four power settings, so calibration values are only required for power settings 0, 4, 8, 12, 16, 20, 24, 28.

Some Muntjacs may have been calibrated before sale. The calibration files for these are included in the latest Portsdown software, and the correct file is loaded when the Muntjac is registered using the procedure above. However, some may not have been factory calibrated (although they will have been tested). They will function perfectly well for DATV without this file. A tool is under development to enable the Muntjac calibration file to be generated by the user.

The Muntjac calibration file has a file name of the format E46214B063533828.mjo where the E number is the flash ID of the RP2040 chip. A file of the correct format with the correct name in the /home/pi/rpidatv/bin/ folder is automatically read by the Muntjac driver and the settings applied. The library of files is in the folder /home/pi/rpidatv/src/muntjac. If you would like your calibration file added to this library, please e-mail it to G8GKQ. An example file can be found at https://github.com/davecrump/portsdown4/blob/master/src/muntjac/E46214B063533828.mjo.

===Output Filtering===

The low band output must be bandpass filtered.

The high band output uses a combined bandpass and notch filter balun, specially designed for the AT86RF215, so additional filtering should not be necessary.

If the low band output is also active, additional filtering on the high band output may be required, to address any feedthrough from the low band output and its harmonics.

https://www.johansontechnology.com/docs/796/2450FB15A050_VdAqien.pdf

===Frequency Accuracy===

The AT86RF215 uses an externally connected 26MHz TXCO on the pcb, with a temperature stability of 0.5ppm and initial accuracy of +/- 2ppm. The 2.4GHz output should be within a few kHz of nominal.

https://aker-usa.com/spec/TX21.pdf

===Shoulders at Various Power Settings===

The plots below show the effect of the power setting on the level of the shoulders at SR333. Shoulders are generally lower on 437MHz for the same power setting.

[[File:Snap80a.jpg|400px]] [[File:Snap76b.jpg|400px]]

[[File:Snap75c.jpg|400px]] [[File:Snap77d.jpg|400px]]

The rising levels at the edges of the plots are an artefact of the Pluto band viewer, as shown by the PWR8 plot in a 10MHz bandwidth.

[[File:Snap78e.jpg|400px]]

===Programming the Microcontroller on the Muntjac===

Muntjacs are provided pre-programmed by the BATC Shop, but this is the procedure to load a firmware update if required.

1. Locate the latest compiled firmware file 'muntjac4_pico-1v**.uf2' which will be found here https://github.com/davecrump/portsdown4/blob/master/src/muntjac/muntjac4_pico-1v0p.uf2 and save it to your desktop.

2. Hold down the BT button (the one nearest the SMA sockets) on the Muntjac while connecting it to your PC using its USB port. The Pico Muntjac appears as a USB disk drive on your PC.

3. Copy the .uf2 file onto the USB drive. The Muntjac will recognise the file and immediately update its firmware, reboot and the PC should recognise a new USB COM device. The main LED on the Muntjac will blink in morse as it reboots. This will be 'HI' for firmware version 1v0b and "MJ" plus the last letter of the firmware version for later versions of the firmware.

4. Disconnect the Muntjac from the PC and connect it to the Portsdown. Make sure that the Muntjac is selected as the Output Device and then Select M2, Info. The Muntjac firmware version will be displayed along with the Muntjac Flash ID.

===Alternative Method of Putting the Microcontroller into Firmware Update Mode===

This may be useful if you've built the Muntjac into a box and cannot easily get to its buttons.

1. Plug the Muntjac into a PC and it will appear as a COM port. Note that this may not work through a USB3 hub.

2. Find the COM port number in device manager and open a serial terminal session to that COM port at 1200 baud, with a terminal program such as putty.

3. The COM port will instantly disappear and the Muntjac will then appear as a USB drive.

4. Proceed with step 3 in the section above.

Note that this depends on the software already in the Muntjac being configured to do this. This approach would not work on a blank Raspberry Pi Pico board, which uses the same RP2040 microcontroller as the Muntjac.

[[File:MJputty1.png|400px]]

===Mixing Options===

As both high and low band outputs may be active at the same time, this gives some options for using a mixer to transvert to other bands.

The same DATV transmission can be made simultaneously on both bands (but NOT from a Portsdown menu), but either band can output a carrier instead and the third harmonic of the low band output can be used to mix the high band output to various frequencies.

These notes are to guide experimentation. Some of the high band frequencies are outside the published specification of the AT86RF215 chip (2400-2483.5MHz). The output must be monitored for quality, stability and frequency accuracy.

Any mixer output MUST be bandpass filtered for the required output frequency. This is particularly important for 23cm, where on 1270MHz for example, the required third harmonic of the low band carrier may be only 58MHz away from the target frequency.

The low band carrier power is set at 26, which is nominally +11dBm. If a passive mixer is used, a Level7 (7dBm local oscillator) mixer is recommended. A suitable mixer is a MiniCircuits ADE-30+ (NOT the ADE-30W+, although that may be more suitable depending on your requirements). https://www.minicircuits.com/pdfs/ADE-30+.pdf

The high and low band outputs are connected to the RF and LO ports of the mixer, which are specced at 200-3000MHz and the output is taken from the IF port, which is specced at 0-1000MHz. The output is likely to be in the range of the tens of microwatts. The 23cm band is outside the IF range, but still produces a usable output.

The following frequency ranges are built into the Muntjac driver in the Portsdown. Putting the target frequency into Portsdown will automatically select the correct high and low band frequencies for mixing.

{| class="wikitable"
|+ Mixing Options
|-
! Output !! Low !! Harmonic !! High
|-
| 3400-3410 || 1010 || - || 2390-2400
|-
| 1300-1305 || 395 || 1185 || 2395-2400
|-
| 1270-1280 || 404 || 1212 || 2482-2492
|-
| 1244-1250 || 390 || 1170 || 2414-2420
|-
| 144-147 || 780 || 2340 || 2484-2487
|-
| 70.5-71.5 || 805 || 2415 || 2485.5-2486.5
|-
| 50-54 || 812 || 2436 || 2486-2490
|-
| 28-30 || 819 || 2457 || 2483-2485
|}

===Fitting and Using the Onboard Mixer===

Details will appear here.

===Using the Third Harmonic of the Low Band for DATV on 23cm===

Details will appear here.

===Command Line Operation===

This gives full control over frequency and power on both high and low band simultaneously and enables Portsdown band viewer to be run at the same time.

Details will appear here.

===Problems===

The Muntjac may not be seen as a USB COM port when connected to a USB3 hub. The USB3 sockets on the RPi4 are not a problem. However, it will appear as a virtual USB drive for software update when connected to a USB3 hub, which is odd.

Repeater Controller

2026-04-25T19:59:27Z

G8GKQ: /* Software update */

The BATC ATV Repeater Controller uses a Raspberry Pi 4 as a fully-featured, but simple-to-implement, ATV repeater controller. Every repeater is different and the controller is designed as a core logic that can be used as the basis for an ATV repeater. The design is flexible with a large number of parameters in a text editable config file so that users can configure it to meet their own needs.

The controller is intended to be used with an HDMI Video switch, but can also be used with other switchers such as an ATEM Mini or older composite video designs.

The outline requirement specification is here [[:media:BATC ATV repeater controller.pdf]]

[[File:HDMI repeater.jpg|650px]]

==Typical operation==

The BATC repeater controller controls single or multiple video switchers either by InfraRed, I2C or GPIO pins. It also generates a carousel of scenes and has an on-board DTMF decoder.

===Carousel===

The carousel can be configured to show up to 99 scenes. The content and duration displayed of each scene is set in the configuration file and the scene can be one of the following:

* Status screen generated by the controller
* jpg or png images played out by the controller
* Video files (in future release).
* Any input on the video switcher, so can display inputs such mast cams, weather stations or Quad video displays.

The still images are read each time before display so can be regularly updated by an external source such as weather maps, propagation maps or DXspots.

===Valid signal input===

On receipt of a valid GPIO line signal from, for example, a Ryde receiver, the controller will, key the transmitter, play an audio beep and display an image for .5 seconds indicating which input has been activated and then switch to that input. When the receiver closes, the logic will play a "K" image and optional "K" in Morse and go back to the carousel.

The receiver input switching line can be directly from a Ryde receiver or an external source such as a sync detector on an analogue source. Note do NOT exceed 3.3 volts on the GPIO input.

===Ident signal===

In order to comply with licensing regulations, a video and/or audio ident can be generated at an interval set in the config file.

===DTMF control===

An on-board DTMF decoder will allow input selection by remote control and also enable GPIO pins to be toggled to enable the control of external equipment.

===Power saving===

To enable power saving by turning the repeater transmitter off during quiet periods, a number of options are available such as only key the transmitter when in repeat mode, do not key the transmit during the night time and only key the transmitter to display the carousel for the first 30 minutes of every hour.

Additionally, the controller can provide time-based control of the power to the receivers and encoder/exciter so that they can be shut down outside operating hours. Two operating periods can be defined in the config file, and the equipment can also be shut down and restarted using a fron-panel button. A preceding shutdown signal is provided to allow proper shutdown of the Raspberry Pis. This power control uses the same GPIO pins as Input 7, so is only compatible with the use of 6 or less repeater inputs.

==Repeater system sample builds==

A number of example configurations are shown on this page [[Repeater system configurations]]

==Hardware control==
The controller will interface to the following:

* Video switches via IR transmitters - up to 2 IR transmitters can be configured separately allowing multiple video switches to be cascaded.

* Video switchers via hardware lines driven from the RPi GPIO lines (note 3.3v logic output)

* i2c

* Network control of an ATEM Mini Pro

The IR, i2c and ATEM commands for each input are set in the config file.

==i2c interface==

The controller will support i2c video switches and relay boards in the future. I2c Interface details are here: [[DATV Repeater i2c Interface]].

===i2c audio switching===

Currently, the controller only supports the i2c controlled Audio switch designed for GB3SQ.

Details of the 8 channel input audio switch PCB can be found here [[DATV repeater audio switch]] and a PCB is available from the BATC shop.

==Configuring IR Switching==

The IR codes for the video switches used on a repeater will need to be entered in the configuration file - see [[Repeater Controller configuration]].

Full details on how to read your IR commands and then configure the system are here: [[Repeater_LIRC_Configuration|Configuring IR for HDMI Switching ]]

===IR Transmitter Control Circuits===

Here are example IR transmitter control circuits for the single and dual switch cases:

[[File:IR Control Circuit.JPG|718px]]

==Configuring ATEM Switching==

The controller can switch an ATEM Mini Pro connected on the LAN. Full details here [[Configuring ATEM Control]].

==Customisation and configuration==

While this software is designed to work "out of the box" it will need to be configured for each individual repeater.

Some configurations can be done using the SSH menu and some real-time control is possible using the ssh Console Menu.

For a detailed description of the configuration details see the [[Repeater Controller configuration]] page.

==DTMF control==

The BATC repeater controller uses an onboard DTMF detector which detects DTMF from the mic input on a USB audio dongle (using a standard Portsdown white USB dongle).

Full details of the functions that can be set by DTMF and their configuration are on this page [[DATV repeater DTMF commands]]

==GPIO Connections==

The repeater controller uses the RPi GPIO port for the following:

*Accepts up to 8 signal detect inputs

*IR / I2C drive output

*GPIO outputs to control video switchers.

*Auxilliary equipment status monitoring inputs

*Auxilliary equipment control outputs

The exact pins used for each function are set in the configuration file.

The Ryde signal detect line can be connected to the input pin but '''Care MUST be taken to buffer the 3.3 volt logic levels used on the Raspberry Pi GPIO pins.'''

A list of GPIO connections is here: [[Repeater GPIO Connections]].

==Mains Power Control==

The controller includes a number of features to reduce mains power consumption and to allow safe shutdown of Raspberry Pi based receivers and the controller itself. Full details can be found here: [[Repeater Controller Power Control]].

==Composite video input==

In order to enable analogue receivers and equipment, such as mast cameras, to be connected to an HDMI switcher, BATC has developed a composite to HDMI converter.

Based on the Ryde software running on a Pi3 or Pi4, it uses a Fushicai EasyCap and provides a high-quality converter even with noisy FM video signals.

===Software===

Build an SD card with the Ryde software and after updating to release 03/03/22 select Option 8 on the Settings Menu in the SSH Console Menu.

Then manually edit the file /home/pi/ryde-build/cv_config.txt where you can set audio out, 16:9/4:3 and the ident caption.

After rebooting with a Fushicai EasyCap connected, the HDMI output will show the Composite video input and carry the audio from the dongle.

'''Note This is not a Ryde facility, the Ryde build was just a convenient starting point for the software build.'''

==Switching Logic==

A detailed description of the operation of the switching logic can be found here: [[Repeater Switching Logic]].

==Project status==

The software was put on full release at the end of March 2022.

Dec 2021 - Requirement spec agreed.

Jan 22 - Alpha release for testing

Feb 10th 2022 - A Beta release version of the software is available for download: https://github.com/BritishAmateurTelevisionClub/atv-rptr

Note this is NOT the final release and there will be bugs! Please provide feedback on the forum.

Feb 15th 2022 - Feature freeze until the first release in March

Marrch 2022 -First production release

February 2023 - Updated to include safe shutdown and receiver/exciter power switching.

===Software download===

The BATC controller is available for download at https://github.com/BritishAmateurTelevisionClub/atv-rptr

Please follow the instructions carefully and note the controller runs on the Buster Lite OS and not Bullseye.

Depending upon demand we may sell preprogrammed SD cards in the BATC shop.

===Software update===

To update the repeater software to the latest version, make sure that the controller is connected to the internet and then log in by ssh. At the ssh prompt enter:

stop
atv-rptr/update-rptr.sh

and follow the on-screen instructions. At the end of the update, the controller will reboot and recommence normal operation.

===Future requirements===

The following features have been identified for inclusion in future releases:

* Implement battery-backed clock (for no internet/power cuts). Will serve NTP to Rydes on same network

* VLC Carousel Play of videos

* Full implementation of i2c accessory switch operation (Entries exist in config file, but not yet coded)

* Composite video output

==Further information==

See https://forum.batc.org.uk/viewtopic.php?f=82&t=7750

Repeater Controller

2026-04-25T19:59:06Z

G8GKQ: /* Software download */

The BATC ATV Repeater Controller uses a Raspberry Pi 4 as a fully-featured, but simple-to-implement, ATV repeater controller. Every repeater is different and the controller is designed as a core logic that can be used as the basis for an ATV repeater. The design is flexible with a large number of parameters in a text editable config file so that users can configure it to meet their own needs.

The controller is intended to be used with an HDMI Video switch, but can also be used with other switchers such as an ATEM Mini or older composite video designs.

The outline requirement specification is here [[:media:BATC ATV repeater controller.pdf]]

[[File:HDMI repeater.jpg|650px]]

==Typical operation==

The BATC repeater controller controls single or multiple video switchers either by InfraRed, I2C or GPIO pins. It also generates a carousel of scenes and has an on-board DTMF decoder.

===Carousel===

The carousel can be configured to show up to 99 scenes. The content and duration displayed of each scene is set in the configuration file and the scene can be one of the following:

* Status screen generated by the controller
* jpg or png images played out by the controller
* Video files (in future release).
* Any input on the video switcher, so can display inputs such mast cams, weather stations or Quad video displays.

The still images are read each time before display so can be regularly updated by an external source such as weather maps, propagation maps or DXspots.

===Valid signal input===

On receipt of a valid GPIO line signal from, for example, a Ryde receiver, the controller will, key the transmitter, play an audio beep and display an image for .5 seconds indicating which input has been activated and then switch to that input. When the receiver closes, the logic will play a "K" image and optional "K" in Morse and go back to the carousel.

The receiver input switching line can be directly from a Ryde receiver or an external source such as a sync detector on an analogue source. Note do NOT exceed 3.3 volts on the GPIO input.

===Ident signal===

In order to comply with licensing regulations, a video and/or audio ident can be generated at an interval set in the config file.

===DTMF control===

An on-board DTMF decoder will allow input selection by remote control and also enable GPIO pins to be toggled to enable the control of external equipment.

===Power saving===

To enable power saving by turning the repeater transmitter off during quiet periods, a number of options are available such as only key the transmitter when in repeat mode, do not key the transmit during the night time and only key the transmitter to display the carousel for the first 30 minutes of every hour.

Additionally, the controller can provide time-based control of the power to the receivers and encoder/exciter so that they can be shut down outside operating hours. Two operating periods can be defined in the config file, and the equipment can also be shut down and restarted using a fron-panel button. A preceding shutdown signal is provided to allow proper shutdown of the Raspberry Pis. This power control uses the same GPIO pins as Input 7, so is only compatible with the use of 6 or less repeater inputs.

==Repeater system sample builds==

A number of example configurations are shown on this page [[Repeater system configurations]]

==Hardware control==
The controller will interface to the following:

* Video switches via IR transmitters - up to 2 IR transmitters can be configured separately allowing multiple video switches to be cascaded.

* Video switchers via hardware lines driven from the RPi GPIO lines (note 3.3v logic output)

* i2c

* Network control of an ATEM Mini Pro

The IR, i2c and ATEM commands for each input are set in the config file.

==i2c interface==

The controller will support i2c video switches and relay boards in the future. I2c Interface details are here: [[DATV Repeater i2c Interface]].

===i2c audio switching===

Currently, the controller only supports the i2c controlled Audio switch designed for GB3SQ.

Details of the 8 channel input audio switch PCB can be found here [[DATV repeater audio switch]] and a PCB is available from the BATC shop.

==Configuring IR Switching==

The IR codes for the video switches used on a repeater will need to be entered in the configuration file - see [[Repeater Controller configuration]].

Full details on how to read your IR commands and then configure the system are here: [[Repeater_LIRC_Configuration|Configuring IR for HDMI Switching ]]

===IR Transmitter Control Circuits===

Here are example IR transmitter control circuits for the single and dual switch cases:

[[File:IR Control Circuit.JPG|718px]]

==Configuring ATEM Switching==

The controller can switch an ATEM Mini Pro connected on the LAN. Full details here [[Configuring ATEM Control]].

==Customisation and configuration==

While this software is designed to work "out of the box" it will need to be configured for each individual repeater.

Some configurations can be done using the SSH menu and some real-time control is possible using the ssh Console Menu.

For a detailed description of the configuration details see the [[Repeater Controller configuration]] page.

==DTMF control==

The BATC repeater controller uses an onboard DTMF detector which detects DTMF from the mic input on a USB audio dongle (using a standard Portsdown white USB dongle).

Full details of the functions that can be set by DTMF and their configuration are on this page [[DATV repeater DTMF commands]]

==GPIO Connections==

The repeater controller uses the RPi GPIO port for the following:

*Accepts up to 8 signal detect inputs

*IR / I2C drive output

*GPIO outputs to control video switchers.

*Auxilliary equipment status monitoring inputs

*Auxilliary equipment control outputs

The exact pins used for each function are set in the configuration file.

The Ryde signal detect line can be connected to the input pin but '''Care MUST be taken to buffer the 3.3 volt logic levels used on the Raspberry Pi GPIO pins.'''

A list of GPIO connections is here: [[Repeater GPIO Connections]].

==Mains Power Control==

The controller includes a number of features to reduce mains power consumption and to allow safe shutdown of Raspberry Pi based receivers and the controller itself. Full details can be found here: [[Repeater Controller Power Control]].

==Composite video input==

In order to enable analogue receivers and equipment, such as mast cameras, to be connected to an HDMI switcher, BATC has developed a composite to HDMI converter.

Based on the Ryde software running on a Pi3 or Pi4, it uses a Fushicai EasyCap and provides a high-quality converter even with noisy FM video signals.

===Software===

Build an SD card with the Ryde software and after updating to release 03/03/22 select Option 8 on the Settings Menu in the SSH Console Menu.

Then manually edit the file /home/pi/ryde-build/cv_config.txt where you can set audio out, 16:9/4:3 and the ident caption.

After rebooting with a Fushicai EasyCap connected, the HDMI output will show the Composite video input and carry the audio from the dongle.

'''Note This is not a Ryde facility, the Ryde build was just a convenient starting point for the software build.'''

==Switching Logic==

A detailed description of the operation of the switching logic can be found here: [[Repeater Switching Logic]].

==Project status==

The software was put on full release at the end of March 2022.

Dec 2021 - Requirement spec agreed.

Jan 22 - Alpha release for testing

Feb 10th 2022 - A Beta release version of the software is available for download: https://github.com/BritishAmateurTelevisionClub/atv-rptr

Note this is NOT the final release and there will be bugs! Please provide feedback on the forum.

Feb 15th 2022 - Feature freeze until the first release in March

Marrch 2022 -First production release

February 2023 - Updated to include safe shutdown and receiver/exciter power switching.

===Software download===

The BATC controller is available for download at https://github.com/BritishAmateurTelevisionClub/atv-rptr

Please follow the instructions carefully and note the controller runs on the Buster Lite OS and not Bullseye.

Depending upon demand we may sell preprogrammed SD cards in the BATC shop.

===Software update===

To update the repeater software to the latest version, make sure that the controller is connected to the internet and then log in by ssh. At the ssh prompt enter:

stop
atv-rptr/update-rptr.sh

and follow the on-screemn instructions. At the end of the update, the controller will reboot and recommence normal operation.

===Future requirements===

The following features have been identified for inclusion in future releases:

* Implement battery-backed clock (for no internet/power cuts). Will serve NTP to Rydes on same network

* VLC Carousel Play of videos

* Full implementation of i2c accessory switch operation (Entries exist in config file, but not yet coded)

* Composite video output

==Further information==

See https://forum.batc.org.uk/viewtopic.php?f=82&t=7750

Portsdown 4 ISS Tracker

2026-04-24T14:24:30Z

G8GKQ: /* Portsdown Implementation */

The Portsdown 4 ISS Tracker is designed to control an az/el rotator to track the ISS during a HamTV transmission. Initial testing has been on a G5500 rotator using the g5500pi controller (https://www.clearskyinstitute.com/ham/G5500/) connected to the rotator; however, other rotator controllers supported by HamLib rotctl may be compatible.

===Portsdown Implementation===

To access the rotator menu, go to M3, ISS HamTV RX Merger, ISS Tracker Set-up.

[[File:ISS Tracker.png|400px]]

Before use, the Controller needs to be configured. Set either "Controller G5500pi" (the default) or "Controller HamLib".

If using the G5500pi controller, select "Set-up Controller" and enter the IP address and port of your controller in the format 192.168.2.140:8008. You may find it useful to allocate a fixed IP address in your network router for the controller.

If using the HamLib controller, select "Set-up Controller" and enter the HamLib device address. This is typically in the format /dev/ttyUSB2. Next enter the model number (the number in the first column of the table below), and the baud rate (typically 9600).

You should also enter the desired park position for your dish; the controller will move the dish to this position at the end of every pass. Select "Set Park Position" and enter the azimuth and elevation.

The configuration settings are stored for future use.

Now select "Track ISS". You should see the demanded position for the ISS displayed above the buttons, and the dish will move to track the position if it is more than 5 degrees above the horizon. Selecting "Track Moon", or "Track Sun" will also display the demanded position, and the dish will track if above 5 degrees.

'''IMPORTANT''' The ISS tracker calculates the azimuth and elevation based on the locator that you have entered for your station in the Portsdown. Check that this is set correctly!

===Details===

Selecting "Track Moon", "Track ISS" or "Track Sun" will always display the current position of the object in the sky. When "Stop" or "Park" are selected, the display of Demanded Position may not be valid. If using the g5500pi controller, the actual position of the dish is also displayed when "Track Moon", "Track ISS" or "Track Sun" is selected. It is hoped to extend this capability to HamLib controllers in the future.

===Flip Mode===

The controller always assumes that the rotator has an end-stop at North. To cater for ISS passes that are North of the dish location, and to better cater for overhead passes, 4 Flip Modes are available. The Flip mode button cycles between these 4 modes:

* '''Flip Mode Disabled'''. In this mode the maximum demanded rotator elevation will be 90 degrees. On ISS passes North of the dish location, some tracking time will be lost just after apogee as the rotator travels nearly 360 degrees to get to the other side of the North end-stop. Note that this mode is the only mode comaptible with rotators that cannot achieve more than 90 degrees elevation.

* '''Flip Mode Auto'''. This mode is a placeholder for a future capability to enable unnattended auto-selection of Flip Modes. Currently it has the same function as "Flip Mode Forced" below.

* '''Flip Mode Forced'''. In this mode, the azimuth is set to (demanded azimuth =/- 180 degrees) and the elevation is set to (180 - the demanded elevation). The effect of this is that the dish tracks the ISS "upside down" (beware waterproofing!) and the rotator end-stop is "moved" to South enabling continuous tracking of ISS passes North of the dish location.

* '''Flip Mode Half-flip'''. This mode is designed to cope with overhead, or near-overhead, passes where the ISS is within the dish beamwidth at apogee. Normally, such passes would need the azimuth rotator to transit 180 degrees after the ISS passed apogee, resulting in the loss of several seconds of tracking after the apogee as the demanded elevation decreased but the rotator was transiting through South while the ISS was in the East. In this mode, the tracking is normal until the ISS reaches an elevation of 80 degrees. Then the azimuth is frozen while the elevation still tracks to apogee; at apogee, the elevation enters flip mode, meaning that it continues to track the ISS through the overhead. Once the ISS descends through 80 degrees again, the azimuth control is unfrozen, but in flip mode, allowing continued tracking to the horizon.

The desired flip mode must currently be selected before the pass. It is hoped to automate this in a future update.

===Offsets===

The 5 offset buttons are provided to allow exact alignment of the dish on the sun before ISS tracking. To achieve this, set up a Noise Meter (such as the Portsdown Lime or Pluto Noise Meter) in place of your MiniTiouner (or SDR) in your HamTV receive set-up.

* Point the dish at the sun, and then use the "Offset UP" button to move it 10 - 15 degrees higher than the sun in a piece of cold sky. Zero the reading on the Noise meter.
* Then press "Cancel Offset" and you should hopefully see the noise rise on the Noise Meter as Sun Noise is received.
* Apply an offset of 3 or 4 degrees in each direction in turn and observe whether there is any increase in noise with the offset (indicatiing that the dish alignment needs to be adjusted) or whether is decreases in all directions (indicating correct alignment). Note that an offset of 3 or 4 degrees will need to be applied in each case to make the dish move - many rotator controllers will not move for only 1 or 2 degrees of demanded movement.
* If you need to make a physical adjustment to the dish repeat the 3 steps above to confirm alignment.

Any offset is applied to ISS Moon or Sun tracking in "Flip Disabled" mode. It may be applied incorrectly in Flip modes - the maths has not been tested!

Good ISS reception on a 90cm dish only needs 1 - 2 dB of sun noise.

===Tracking while Receiving===

The tracker is designed to keep running whilst the ISS is received on the same Portsdown. Clearly no indication of dish position is provided during receive.

===Supported HamLib Rotator Controllers===

Portsdown 4 uses an early version of HamLib (rotctl(d), Hamlib 3.3) that supports the following controllers:

Rot # Mfg Model Version Status
1 Hamlib Dummy 0.2 Beta
2 Hamlib NET rotctl 0.3 Beta
201 Hamlib EasycommI 0.4 Beta
202 Hamlib EasycommII 0.4 Beta
204 Hamlib EasycommIII 0.4 Alpha
301 XQ2FOD Fodtrack 0.2 Stable
401 Idiom Press Rotor-EZ 2010-02-14 Beta
402 Idiom Press RotorCard 2010-02-14 Untested
403 Hy-Gain DCU-1/DCU-1X 2010-08-23 Untested
404 DF9GR ERC 2010-08-23b Alpha
405 Green Heron RT-21 2014-09-14 Alpha
501 SARtek SARtek-1 0.2 Untested
601 Yaesu GS-232A 0.3 Beta
602 Yaesu/Kenpro GS-232 0.1 Beta
603 Yaesu GS-232B 0.2 Beta
604 F1TE GS232/F1TE Tracker 0.1 Beta
701 WA6UFQ PcRotor 0.1 Untested
801 Heathkit HD 1780 Intellirotor 0.1 Beta
901 SPID Rot2Prog 1.0 Stable
902 SPID Rot1Prog 1.0 Stable
903 SPID MD-01/02 (ROT2 mode) 1.0 Stable
1001 M2 RC2800 0.1.1 Beta
1101 EA4TX ARS RCI AZ&EL 0.1 Beta
1102 EA4TX ARS RCI AZ 0.1 Beta
1201 AMSAT IF-100 0.1 Untested
1301 LA7LKA ts7400 0.1 Beta
1401 Celestron NexStar 0.1 Untested
1501 DG9OAA Ether6 (via ethernet) 0.1 Beta
1601 CNCTRK CNCTRK 0.1 Untested
1701 Prosistel Prosistel D 0.3 Beta
1801 Meade LX200 0.1 Alpha

===Acknowledgements===

Thanks to Paul M0EYT for the original Python tracking program.

Portsdown 4 ISS Tracker

2026-04-21T19:55:06Z

G8GKQ: /* Offsets */

The Portsdown 4 ISS Tracker is designed to control an az/el rotator to track the ISS during a HamTV transmission. Initial testing has been on a G5500 rotator using the g5500pi controller (https://www.clearskyinstitute.com/ham/G5500/) connected to the rotator; however, other rotator controllers supported by HamLib rotctl may be compatible.

===Portsdown Implementation===

To access the rotator menu, go to M3, ISS HamTV RX Merger, ISS Tracker Set-up.

[[File:ISS Tracker.png|400px]]

Before use, the Controller needs to be configured. Set either "Controller G5500pi" (the default) or "Controller HamLib".

If using the G5500pi controller, select "Set-up Controller" and enter the IP address and port of your controller in the format 192.168.2.140:8008. You may find it useful to allocate a fixed IP address in your network router for the controller.

If using the HamLib controller, select "Set-up Controller" and enter the HamLib device address. This is typically in the format /dev/ttyUSB2. Next enter the model number (the number in the first column of the table below), and the baud rate (typically 9600).

You should also enter the desired park position for your dish; the controller will move the dish to this position at the end of every pass. Select "Set Park Position" and enter the azimuth and elevation.

The configuration settings are stored for future use.

Now select "Track ISS". You should see the demanded position for the ISS displayed above the buttons, and the dish will move to track the position if it is more than 5 degrees above the horizon. Selecting "Track Moon", or "Track Sun" will also display the demanded position, and the dish will track if above 5 degrees.

===Details===

Selecting "Track Moon", "Track ISS" or "Track Sun" will always display the current position of the object in the sky. When "Stop" or "Park" are selected, the display of Demanded Position may not be valid. If using the g5500pi controller, the actual position of the dish is also displayed when "Track Moon", "Track ISS" or "Track Sun" is selected. It is hoped to extend this capability to HamLib controllers in the future.

===Flip Mode===

The controller always assumes that the rotator has an end-stop at North. To cater for ISS passes that are North of the dish location, and to better cater for overhead passes, 4 Flip Modes are available. The Flip mode button cycles between these 4 modes:

* '''Flip Mode Disabled'''. In this mode the maximum demanded rotator elevation will be 90 degrees. On ISS passes North of the dish location, some tracking time will be lost just after apogee as the rotator travels nearly 360 degrees to get to the other side of the North end-stop. Note that this mode is the only mode comaptible with rotators that cannot achieve more than 90 degrees elevation.

* '''Flip Mode Auto'''. This mode is a placeholder for a future capability to enable unnattended auto-selection of Flip Modes. Currently it has the same function as "Flip Mode Forced" below.

* '''Flip Mode Forced'''. In this mode, the azimuth is set to (demanded azimuth =/- 180 degrees) and the elevation is set to (180 - the demanded elevation). The effect of this is that the dish tracks the ISS "upside down" (beware waterproofing!) and the rotator end-stop is "moved" to South enabling continuous tracking of ISS passes North of the dish location.

* '''Flip Mode Half-flip'''. This mode is designed to cope with overhead, or near-overhead, passes where the ISS is within the dish beamwidth at apogee. Normally, such passes would need the azimuth rotator to transit 180 degrees after the ISS passed apogee, resulting in the loss of several seconds of tracking after the apogee as the demanded elevation decreased but the rotator was transiting through South while the ISS was in the East. In this mode, the tracking is normal until the ISS reaches an elevation of 80 degrees. Then the azimuth is frozen while the elevation still tracks to apogee; at apogee, the elevation enters flip mode, meaning that it continues to track the ISS through the overhead. Once the ISS descends through 80 degrees again, the azimuth control is unfrozen, but in flip mode, allowing continued tracking to the horizon.

The desired flip mode must currently be selected before the pass. It is hoped to automate this in a future update.

===Offsets===

The 5 offset buttons are provided to allow exact alignment of the dish on the sun before ISS tracking. To achieve this, set up a Noise Meter (such as the Portsdown Lime or Pluto Noise Meter) in place of your MiniTiouner (or SDR) in your HamTV receive set-up.

* Point the dish at the sun, and then use the "Offset UP" button to move it 10 - 15 degrees higher than the sun in a piece of cold sky. Zero the reading on the Noise meter.
* Then press "Cancel Offset" and you should hopefully see the noise rise on the Noise Meter as Sun Noise is received.
* Apply an offset of 3 or 4 degrees in each direction in turn and observe whether there is any increase in noise with the offset (indicatiing that the dish alignment needs to be adjusted) or whether is decreases in all directions (indicating correct alignment). Note that an offset of 3 or 4 degrees will need to be applied in each case to make the dish move - many rotator controllers will not move for only 1 or 2 degrees of demanded movement.
* If you need to make a physical adjustment to the dish repeat the 3 steps above to confirm alignment.

Any offset is applied to ISS Moon or Sun tracking in "Flip Disabled" mode. It may be applied incorrectly in Flip modes - the maths has not been tested!

Good ISS reception on a 90cm dish only needs 1 - 2 dB of sun noise.

===Tracking while Receiving===

The tracker is designed to keep running whilst the ISS is received on the same Portsdown. Clearly no indication of dish position is provided during receive.

===Supported HamLib Rotator Controllers===

Portsdown 4 uses an early version of HamLib (rotctl(d), Hamlib 3.3) that supports the following controllers:

Rot # Mfg Model Version Status
1 Hamlib Dummy 0.2 Beta
2 Hamlib NET rotctl 0.3 Beta
201 Hamlib EasycommI 0.4 Beta
202 Hamlib EasycommII 0.4 Beta
204 Hamlib EasycommIII 0.4 Alpha
301 XQ2FOD Fodtrack 0.2 Stable
401 Idiom Press Rotor-EZ 2010-02-14 Beta
402 Idiom Press RotorCard 2010-02-14 Untested
403 Hy-Gain DCU-1/DCU-1X 2010-08-23 Untested
404 DF9GR ERC 2010-08-23b Alpha
405 Green Heron RT-21 2014-09-14 Alpha
501 SARtek SARtek-1 0.2 Untested
601 Yaesu GS-232A 0.3 Beta
602 Yaesu/Kenpro GS-232 0.1 Beta
603 Yaesu GS-232B 0.2 Beta
604 F1TE GS232/F1TE Tracker 0.1 Beta
701 WA6UFQ PcRotor 0.1 Untested
801 Heathkit HD 1780 Intellirotor 0.1 Beta
901 SPID Rot2Prog 1.0 Stable
902 SPID Rot1Prog 1.0 Stable
903 SPID MD-01/02 (ROT2 mode) 1.0 Stable
1001 M2 RC2800 0.1.1 Beta
1101 EA4TX ARS RCI AZ&EL 0.1 Beta
1102 EA4TX ARS RCI AZ 0.1 Beta
1201 AMSAT IF-100 0.1 Untested
1301 LA7LKA ts7400 0.1 Beta
1401 Celestron NexStar 0.1 Untested
1501 DG9OAA Ether6 (via ethernet) 0.1 Beta
1601 CNCTRK CNCTRK 0.1 Untested
1701 Prosistel Prosistel D 0.3 Beta
1801 Meade LX200 0.1 Alpha

===Acknowledgements===

Thanks to Paul M0EYT for the original Python tracking program.

Portsdown 4 ISS Tracker

2026-04-21T15:37:56Z

G8GKQ: /* Supported HamLib Rotator Controllers */

The Portsdown 4 ISS Tracker is designed to control an az/el rotator to track the ISS during a HamTV transmission. Initial testing has been on a G5500 rotator using the g5500pi controller (https://www.clearskyinstitute.com/ham/G5500/) connected to the rotator; however, other rotator controllers supported by HamLib rotctl may be compatible.

===Portsdown Implementation===

To access the rotator menu, go to M3, ISS HamTV RX Merger, ISS Tracker Set-up.

[[File:ISS Tracker.png|400px]]

Before use, the Controller needs to be configured. Set either "Controller G5500pi" (the default) or "Controller HamLib".

If using the G5500pi controller, select "Set-up Controller" and enter the IP address and port of your controller in the format 192.168.2.140:8008. You may find it useful to allocate a fixed IP address in your network router for the controller.

If using the HamLib controller, select "Set-up Controller" and enter the HamLib device address. This is typically in the format /dev/ttyUSB2. Next enter the model number (the number in the first column of the table below), and the baud rate (typically 9600).

You should also enter the desired park position for your dish; the controller will move the dish to this position at the end of every pass. Select "Set Park Position" and enter the azimuth and elevation.

The configuration settings are stored for future use.

Now select "Track ISS". You should see the demanded position for the ISS displayed above the buttons, and the dish will move to track the position if it is more than 5 degrees above the horizon. Selecting "Track Moon", or "Track Sun" will also display the demanded position, and the dish will track if above 5 degrees.

===Details===

Selecting "Track Moon", "Track ISS" or "Track Sun" will always display the current position of the object in the sky. When "Stop" or "Park" are selected, the display of Demanded Position may not be valid. If using the g5500pi controller, the actual position of the dish is also displayed when "Track Moon", "Track ISS" or "Track Sun" is selected. It is hoped to extend this capability to HamLib controllers in the future.

===Flip Mode===

The controller always assumes that the rotator has an end-stop at North. To cater for ISS passes that are North of the dish location, and to better cater for overhead passes, 4 Flip Modes are available. The Flip mode button cycles between these 4 modes:

* '''Flip Mode Disabled'''. In this mode the maximum demanded rotator elevation will be 90 degrees. On ISS passes North of the dish location, some tracking time will be lost just after apogee as the rotator travels nearly 360 degrees to get to the other side of the North end-stop. Note that this mode is the only mode comaptible with rotators that cannot achieve more than 90 degrees elevation.

* '''Flip Mode Auto'''. This mode is a placeholder for a future capability to enable unnattended auto-selection of Flip Modes. Currently it has the same function as "Flip Mode Forced" below.

* '''Flip Mode Forced'''. In this mode, the azimuth is set to (demanded azimuth =/- 180 degrees) and the elevation is set to (180 - the demanded elevation). The effect of this is that the dish tracks the ISS "upside down" (beware waterproofing!) and the rotator end-stop is "moved" to South enabling continuous tracking of ISS passes North of the dish location.

* '''Flip Mode Half-flip'''. This mode is designed to cope with overhead, or near-overhead, passes where the ISS is within the dish beamwidth at apogee. Normally, such passes would need the azimuth rotator to transit 180 degrees after the ISS passed apogee, resulting in the loss of several seconds of tracking after the apogee as the demanded elevation decreased but the rotator was transiting through South while the ISS was in the East. In this mode, the tracking is normal until the ISS reaches an elevation of 80 degrees. Then the azimuth is frozen while the elevation still tracks to apogee; at apogee, the elevation enters flip mode, meaning that it continues to track the ISS through the overhead. Once the ISS descends through 80 degrees again, the azimuth control is unfrozen, but in flip mode, allowing continued tracking to the horizon.

The desired flip mode must currently be selected before the pass. It is hoped to automate this in a future update.

===Offsets===

The 5 offset buttons are provided to allow exact alignment of the dish on the sun before ISS tracking. To achieve this, set up a Noise Meter (such as the Portsdown Lime or Pluto Noise Meter) in place of your MiniTiouner (or SDR) in your HamTV receive set-up.

* Point the dish at the sun, and then use the "Offset UP" button to move it 10 - 15 degrees higher than the sun in a piece of cold sky. Zero the reading on the Noise meter.
* Then press "Cancel Offset" and you should hopefully see the noise rise on the Noise Meter as Sun Noise is received.
* Apply an offset of 3 or 4 degrees in each direction in turn and observe whether there is any increase in noise with the offset (indicatiing that the dish alignment needs to be adjusted) or whether is decreases in all directions (indicating correct alignment). Note that an offset of 3 or 4 degrees will need to be applied in each case to make the dish move - many rotator controllers will not move for only 1 or 2 degrees of demanded movement.
* If you need to make a physical adjustment to the dish repeat 3 steps above to confirm alignment.

Any offset is applied to ISS Moon or Sun tracking in "Flip Disabled" mode. It may be applied incorrectly in Flip modes - the maths has not been tested!

Good ISS reception on a 90cm dish only needs 1 - 2 dB of sun noise.

===Tracking while Receiving===

The tracker is designed to keep running whilst the ISS is received on the same Portsdown. Clearly no indication of dish position is provided during receive.

===Supported HamLib Rotator Controllers===

Portsdown 4 uses an early version of HamLib (rotctl(d), Hamlib 3.3) that supports the following controllers:

Rot # Mfg Model Version Status
1 Hamlib Dummy 0.2 Beta
2 Hamlib NET rotctl 0.3 Beta
201 Hamlib EasycommI 0.4 Beta
202 Hamlib EasycommII 0.4 Beta
204 Hamlib EasycommIII 0.4 Alpha
301 XQ2FOD Fodtrack 0.2 Stable
401 Idiom Press Rotor-EZ 2010-02-14 Beta
402 Idiom Press RotorCard 2010-02-14 Untested
403 Hy-Gain DCU-1/DCU-1X 2010-08-23 Untested
404 DF9GR ERC 2010-08-23b Alpha
405 Green Heron RT-21 2014-09-14 Alpha
501 SARtek SARtek-1 0.2 Untested
601 Yaesu GS-232A 0.3 Beta
602 Yaesu/Kenpro GS-232 0.1 Beta
603 Yaesu GS-232B 0.2 Beta
604 F1TE GS232/F1TE Tracker 0.1 Beta
701 WA6UFQ PcRotor 0.1 Untested
801 Heathkit HD 1780 Intellirotor 0.1 Beta
901 SPID Rot2Prog 1.0 Stable
902 SPID Rot1Prog 1.0 Stable
903 SPID MD-01/02 (ROT2 mode) 1.0 Stable
1001 M2 RC2800 0.1.1 Beta
1101 EA4TX ARS RCI AZ&EL 0.1 Beta
1102 EA4TX ARS RCI AZ 0.1 Beta
1201 AMSAT IF-100 0.1 Untested
1301 LA7LKA ts7400 0.1 Beta
1401 Celestron NexStar 0.1 Untested
1501 DG9OAA Ether6 (via ethernet) 0.1 Beta
1601 CNCTRK CNCTRK 0.1 Untested
1701 Prosistel Prosistel D 0.3 Beta
1801 Meade LX200 0.1 Alpha

===Acknowledgements===

Thanks to Paul M0EYT for the original Python tracking program.

Portsdown 4 ISS Tracker

2026-04-21T15:36:57Z

G8GKQ: /* Offsets */

The Portsdown 4 ISS Tracker is designed to control an az/el rotator to track the ISS during a HamTV transmission. Initial testing has been on a G5500 rotator using the g5500pi controller (https://www.clearskyinstitute.com/ham/G5500/) connected to the rotator; however, other rotator controllers supported by HamLib rotctl may be compatible.

===Portsdown Implementation===

To access the rotator menu, go to M3, ISS HamTV RX Merger, ISS Tracker Set-up.

[[File:ISS Tracker.png|400px]]

Before use, the Controller needs to be configured. Set either "Controller G5500pi" (the default) or "Controller HamLib".

If using the G5500pi controller, select "Set-up Controller" and enter the IP address and port of your controller in the format 192.168.2.140:8008. You may find it useful to allocate a fixed IP address in your network router for the controller.

If using the HamLib controller, select "Set-up Controller" and enter the HamLib device address. This is typically in the format /dev/ttyUSB2. Next enter the model number (the number in the first column of the table below), and the baud rate (typically 9600).

You should also enter the desired park position for your dish; the controller will move the dish to this position at the end of every pass. Select "Set Park Position" and enter the azimuth and elevation.

The configuration settings are stored for future use.

Now select "Track ISS". You should see the demanded position for the ISS displayed above the buttons, and the dish will move to track the position if it is more than 5 degrees above the horizon. Selecting "Track Moon", or "Track Sun" will also display the demanded position, and the dish will track if above 5 degrees.

===Details===

Selecting "Track Moon", "Track ISS" or "Track Sun" will always display the current position of the object in the sky. When "Stop" or "Park" are selected, the display of Demanded Position may not be valid. If using the g5500pi controller, the actual position of the dish is also displayed when "Track Moon", "Track ISS" or "Track Sun" is selected. It is hoped to extend this capability to HamLib controllers in the future.

===Flip Mode===

The controller always assumes that the rotator has an end-stop at North. To cater for ISS passes that are North of the dish location, and to better cater for overhead passes, 4 Flip Modes are available. The Flip mode button cycles between these 4 modes:

* '''Flip Mode Disabled'''. In this mode the maximum demanded rotator elevation will be 90 degrees. On ISS passes North of the dish location, some tracking time will be lost just after apogee as the rotator travels nearly 360 degrees to get to the other side of the North end-stop. Note that this mode is the only mode comaptible with rotators that cannot achieve more than 90 degrees elevation.

* '''Flip Mode Auto'''. This mode is a placeholder for a future capability to enable unnattended auto-selection of Flip Modes. Currently it has the same function as "Flip Mode Forced" below.

* '''Flip Mode Forced'''. In this mode, the azimuth is set to (demanded azimuth =/- 180 degrees) and the elevation is set to (180 - the demanded elevation). The effect of this is that the dish tracks the ISS "upside down" (beware waterproofing!) and the rotator end-stop is "moved" to South enabling continuous tracking of ISS passes North of the dish location.

* '''Flip Mode Half-flip'''. This mode is designed to cope with overhead, or near-overhead, passes where the ISS is within the dish beamwidth at apogee. Normally, such passes would need the azimuth rotator to transit 180 degrees after the ISS passed apogee, resulting in the loss of several seconds of tracking after the apogee as the demanded elevation decreased but the rotator was transiting through South while the ISS was in the East. In this mode, the tracking is normal until the ISS reaches an elevation of 80 degrees. Then the azimuth is frozen while the elevation still tracks to apogee; at apogee, the elevation enters flip mode, meaning that it continues to track the ISS through the overhead. Once the ISS descends through 80 degrees again, the azimuth control is unfrozen, but in flip mode, allowing continued tracking to the horizon.

The desired flip mode must currently be selected before the pass. It is hoped to automate this in a future update.

===Offsets===

The 5 offset buttons are provided to allow exact alignment of the dish on the sun before ISS tracking. To achieve this, set up a Noise Meter (such as the Portsdown Lime or Pluto Noise Meter) in place of your MiniTiouner (or SDR) in your HamTV receive set-up.

* Point the dish at the sun, and then use the "Offset UP" button to move it 10 - 15 degrees higher than the sun in a piece of cold sky. Zero the reading on the Noise meter.
* Then press "Cancel Offset" and you should hopefully see the noise rise on the Noise Meter as Sun Noise is received.
* Apply an offset of 3 or 4 degrees in each direction in turn and observe whether there is any increase in noise with the offset (indicatiing that the dish alignment needs to be adjusted) or whether is decreases in all directions (indicating correct alignment). Note that an offset of 3 or 4 degrees will need to be applied in each case to make the dish move - many rotator controllers will not move for only 1 or 2 degrees of demanded movement.
* If you need to make a physical adjustment to the dish repeat 3 steps above to confirm alignment.

Any offset is applied to ISS Moon or Sun tracking in "Flip Disabled" mode. It may be applied incorrectly in Flip modes - the maths has not been tested!

Good ISS reception on a 90cm dish only needs 1 - 2 dB of sun noise.

===Tracking while Receiving===

The tracker is designed to keep running whilst the ISS is received on the same Portsdown. Clearly no indication of dish position is provided during receive.

===Supported HamLib Rotator Controllers===

Portsdown 4 uses an early version of HamLib (rotctl(d), Hamlib 3.3) that supports the following controllers:

Rot # Mfg Model Version Status
1 Hamlib Dummy 0.2 Beta
2 Hamlib NET rotctl 0.3 Beta
201 Hamlib EasycommI 0.4 Beta
202 Hamlib EasycommII 0.4 Beta
204 Hamlib EasycommIII 0.4 Alpha
301 XQ2FOD Fodtrack 0.2 Stable
401 Idiom Press Rotor-EZ 2010-02-14 Beta
402 Idiom Press RotorCard 2010-02-14 Untested
403 Hy-Gain DCU-1/DCU-1X 2010-08-23 Untested
404 DF9GR ERC 2010-08-23b Alpha
405 Green Heron RT-21 2014-09-14 Alpha
501 SARtek SARtek-1 0.2 Untested
601 Yaesu GS-232A 0.3 Beta
602 Yaesu/Kenpro GS-232 0.1 Beta
603 Yaesu GS-232B 0.2 Beta
604 F1TE GS232/F1TE Tracker 0.1 Beta
701 WA6UFQ PcRotor 0.1 Untested
801 Heathkit HD 1780 Intellirotor 0.1 Beta
901 SPID Rot2Prog 1.0 Stable
902 SPID Rot1Prog 1.0 Stable
903 SPID MD-01/02 (ROT2 mode) 1.0 Stable
1001 M2 RC2800 0.1.1 Beta
1101 EA4TX ARS RCI AZ&EL 0.1 Beta
1102 EA4TX ARS RCI AZ 0.1 Beta
1201 AMSAT IF-100 0.1 Untested
1301 LA7LKA ts7400 0.1 Beta
1401 Celestron NexStar 0.1 Untested
1501 DG9OAA Ether6 (via ethernet) 0.1 Beta
1601 CNCTRK CNCTRK 0.1 Untested
1701 Prosistel Prosistel D 0.3 Beta
1801 Meade LX200 0.1 Alpha

Portsdown 4 ISS Tracker

2026-04-21T15:35:29Z

G8GKQ: /* Offsets */

The Portsdown 4 ISS Tracker is designed to control an az/el rotator to track the ISS during a HamTV transmission. Initial testing has been on a G5500 rotator using the g5500pi controller (https://www.clearskyinstitute.com/ham/G5500/) connected to the rotator; however, other rotator controllers supported by HamLib rotctl may be compatible.

===Portsdown Implementation===

To access the rotator menu, go to M3, ISS HamTV RX Merger, ISS Tracker Set-up.

[[File:ISS Tracker.png|400px]]

Before use, the Controller needs to be configured. Set either "Controller G5500pi" (the default) or "Controller HamLib".

If using the G5500pi controller, select "Set-up Controller" and enter the IP address and port of your controller in the format 192.168.2.140:8008. You may find it useful to allocate a fixed IP address in your network router for the controller.

If using the HamLib controller, select "Set-up Controller" and enter the HamLib device address. This is typically in the format /dev/ttyUSB2. Next enter the model number (the number in the first column of the table below), and the baud rate (typically 9600).

You should also enter the desired park position for your dish; the controller will move the dish to this position at the end of every pass. Select "Set Park Position" and enter the azimuth and elevation.

The configuration settings are stored for future use.

Now select "Track ISS". You should see the demanded position for the ISS displayed above the buttons, and the dish will move to track the position if it is more than 5 degrees above the horizon. Selecting "Track Moon", or "Track Sun" will also display the demanded position, and the dish will track if above 5 degrees.

===Details===

Selecting "Track Moon", "Track ISS" or "Track Sun" will always display the current position of the object in the sky. When "Stop" or "Park" are selected, the display of Demanded Position may not be valid. If using the g5500pi controller, the actual position of the dish is also displayed when "Track Moon", "Track ISS" or "Track Sun" is selected. It is hoped to extend this capability to HamLib controllers in the future.

===Flip Mode===

The controller always assumes that the rotator has an end-stop at North. To cater for ISS passes that are North of the dish location, and to better cater for overhead passes, 4 Flip Modes are available. The Flip mode button cycles between these 4 modes:

* '''Flip Mode Disabled'''. In this mode the maximum demanded rotator elevation will be 90 degrees. On ISS passes North of the dish location, some tracking time will be lost just after apogee as the rotator travels nearly 360 degrees to get to the other side of the North end-stop. Note that this mode is the only mode comaptible with rotators that cannot achieve more than 90 degrees elevation.

* '''Flip Mode Auto'''. This mode is a placeholder for a future capability to enable unnattended auto-selection of Flip Modes. Currently it has the same function as "Flip Mode Forced" below.

* '''Flip Mode Forced'''. In this mode, the azimuth is set to (demanded azimuth =/- 180 degrees) and the elevation is set to (180 - the demanded elevation). The effect of this is that the dish tracks the ISS "upside down" (beware waterproofing!) and the rotator end-stop is "moved" to South enabling continuous tracking of ISS passes North of the dish location.

* '''Flip Mode Half-flip'''. This mode is designed to cope with overhead, or near-overhead, passes where the ISS is within the dish beamwidth at apogee. Normally, such passes would need the azimuth rotator to transit 180 degrees after the ISS passed apogee, resulting in the loss of several seconds of tracking after the apogee as the demanded elevation decreased but the rotator was transiting through South while the ISS was in the East. In this mode, the tracking is normal until the ISS reaches an elevation of 80 degrees. Then the azimuth is frozen while the elevation still tracks to apogee; at apogee, the elevation enters flip mode, meaning that it continues to track the ISS through the overhead. Once the ISS descends through 80 degrees again, the azimuth control is unfrozen, but in flip mode, allowing continued tracking to the horizon.

The desired flip mode must currently be selected before the pass. It is hoped to automate this in a future update.

===Offsets===

The 5 offset buttons are provided to allow exact alignment of the dish on the sun before ISS tracking. To achieve this, set up a Noise Meter (such as the Portsdown Lime or Pluto Noise Meter) in place of your MiniTiouner (or SDR) in your HamTV receive set-up.

* Point the dish at the sun, and then use the "Offset UP" button to move it 10 - 15 degrees higher than the sun in a piece of cold sky. Zero the reading on the Noise meter.
* Then press "Cancel Offset" and you should hopefully see the noise rise on the Noise Meter as Sun Noise is received.
* Apply an offset of 3 or 4 degrees in each direction in turn and observe whether there is any increase in noise with the offset (indicatiing that the dish alignment needs to be adjusted) or whether is decreases in all directions (indicating correct alignment). Note that an offset of 3 or 4 degrees will need to be applied in each case to make the dish move - many rotator controllers will not move for only 1 or 2 degrees of demanded movement.
* If you need to make a physical adjustment to the dish repeat 3 steps above to confirm alignment.

Any offset is applied to ISS Moon or Sun tracking in "Flip Disabled" mode. It may be applied incorrectly in Flip modes - the maths has not been tested!

Good ISS reception on a 90cm dish only needs 1 - 2 dB of sun noise.

===Supported HamLib Rotator Controllers===

Portsdown 4 uses an early version of HamLib (rotctl(d), Hamlib 3.3) that supports the following controllers:

Rot # Mfg Model Version Status
1 Hamlib Dummy 0.2 Beta
2 Hamlib NET rotctl 0.3 Beta
201 Hamlib EasycommI 0.4 Beta
202 Hamlib EasycommII 0.4 Beta
204 Hamlib EasycommIII 0.4 Alpha
301 XQ2FOD Fodtrack 0.2 Stable
401 Idiom Press Rotor-EZ 2010-02-14 Beta
402 Idiom Press RotorCard 2010-02-14 Untested
403 Hy-Gain DCU-1/DCU-1X 2010-08-23 Untested
404 DF9GR ERC 2010-08-23b Alpha
405 Green Heron RT-21 2014-09-14 Alpha
501 SARtek SARtek-1 0.2 Untested
601 Yaesu GS-232A 0.3 Beta
602 Yaesu/Kenpro GS-232 0.1 Beta
603 Yaesu GS-232B 0.2 Beta
604 F1TE GS232/F1TE Tracker 0.1 Beta
701 WA6UFQ PcRotor 0.1 Untested
801 Heathkit HD 1780 Intellirotor 0.1 Beta
901 SPID Rot2Prog 1.0 Stable
902 SPID Rot1Prog 1.0 Stable
903 SPID MD-01/02 (ROT2 mode) 1.0 Stable
1001 M2 RC2800 0.1.1 Beta
1101 EA4TX ARS RCI AZ&EL 0.1 Beta
1102 EA4TX ARS RCI AZ 0.1 Beta
1201 AMSAT IF-100 0.1 Untested
1301 LA7LKA ts7400 0.1 Beta
1401 Celestron NexStar 0.1 Untested
1501 DG9OAA Ether6 (via ethernet) 0.1 Beta
1601 CNCTRK CNCTRK 0.1 Untested
1701 Prosistel Prosistel D 0.3 Beta
1801 Meade LX200 0.1 Alpha

Portsdown 4 ISS Tracker

2026-04-21T15:19:39Z

G8GKQ: /* Offsets */

The Portsdown 4 ISS Tracker is designed to control an az/el rotator to track the ISS during a HamTV transmission. Initial testing has been on a G5500 rotator using the g5500pi controller (https://www.clearskyinstitute.com/ham/G5500/) connected to the rotator; however, other rotator controllers supported by HamLib rotctl may be compatible.

===Portsdown Implementation===

To access the rotator menu, go to M3, ISS HamTV RX Merger, ISS Tracker Set-up.

[[File:ISS Tracker.png|400px]]

Before use, the Controller needs to be configured. Set either "Controller G5500pi" (the default) or "Controller HamLib".

If using the G5500pi controller, select "Set-up Controller" and enter the IP address and port of your controller in the format 192.168.2.140:8008. You may find it useful to allocate a fixed IP address in your network router for the controller.

If using the HamLib controller, select "Set-up Controller" and enter the HamLib device address. This is typically in the format /dev/ttyUSB2. Next enter the model number (the number in the first column of the table below), and the baud rate (typically 9600).

You should also enter the desired park position for your dish; the controller will move the dish to this position at the end of every pass. Select "Set Park Position" and enter the azimuth and elevation.

The configuration settings are stored for future use.

Now select "Track ISS". You should see the demanded position for the ISS displayed above the buttons, and the dish will move to track the position if it is more than 5 degrees above the horizon. Selecting "Track Moon", or "Track Sun" will also display the demanded position, and the dish will track if above 5 degrees.

===Details===

Selecting "Track Moon", "Track ISS" or "Track Sun" will always display the current position of the object in the sky. When "Stop" or "Park" are selected, the display of Demanded Position may not be valid. If using the g5500pi controller, the actual position of the dish is also displayed when "Track Moon", "Track ISS" or "Track Sun" is selected. It is hoped to extend this capability to HamLib controllers in the future.

===Flip Mode===

The controller always assumes that the rotator has an end-stop at North. To cater for ISS passes that are North of the dish location, and to better cater for overhead passes, 4 Flip Modes are available. The Flip mode button cycles between these 4 modes:

* '''Flip Mode Disabled'''. In this mode the maximum demanded rotator elevation will be 90 degrees. On ISS passes North of the dish location, some tracking time will be lost just after apogee as the rotator travels nearly 360 degrees to get to the other side of the North end-stop. Note that this mode is the only mode comaptible with rotators that cannot achieve more than 90 degrees elevation.

* '''Flip Mode Auto'''. This mode is a placeholder for a future capability to enable unnattended auto-selection of Flip Modes. Currently it has the same function as "Flip Mode Forced" below.

* '''Flip Mode Forced'''. In this mode, the azimuth is set to (demanded azimuth =/- 180 degrees) and the elevation is set to (180 - the demanded elevation). The effect of this is that the dish tracks the ISS "upside down" (beware waterproofing!) and the rotator end-stop is "moved" to South enabling continuous tracking of ISS passes North of the dish location.

* '''Flip Mode Half-flip'''. This mode is designed to cope with overhead, or near-overhead, passes where the ISS is within the dish beamwidth at apogee. Normally, such passes would need the azimuth rotator to transit 180 degrees after the ISS passed apogee, resulting in the loss of several seconds of tracking after the apogee as the demanded elevation decreased but the rotator was transiting through South while the ISS was in the East. In this mode, the tracking is normal until the ISS reaches an elevation of 80 degrees. Then the azimuth is frozen while the elevation still tracks to apogee; at apogee, the elevation enters flip mode, meaning that it continues to track the ISS through the overhead. Once the ISS descends through 80 degrees again, the azimuth control is unfrozen, but in flip mode, allowing continued tracking to the horizon.

The desired flip mode must currently be selected before the pass. It is hoped to automate this in a future update.

===Offsets===

The 5 offset buttons are provided to allow exact alignment of the dish on the sun before use for ISS tracking.

===Supported HamLib Rotator Controllers===

Portsdown 4 uses an early version of HamLib (rotctl(d), Hamlib 3.3) that supports the following controllers:

Rot # Mfg Model Version Status
1 Hamlib Dummy 0.2 Beta
2 Hamlib NET rotctl 0.3 Beta
201 Hamlib EasycommI 0.4 Beta
202 Hamlib EasycommII 0.4 Beta
204 Hamlib EasycommIII 0.4 Alpha
301 XQ2FOD Fodtrack 0.2 Stable
401 Idiom Press Rotor-EZ 2010-02-14 Beta
402 Idiom Press RotorCard 2010-02-14 Untested
403 Hy-Gain DCU-1/DCU-1X 2010-08-23 Untested
404 DF9GR ERC 2010-08-23b Alpha
405 Green Heron RT-21 2014-09-14 Alpha
501 SARtek SARtek-1 0.2 Untested
601 Yaesu GS-232A 0.3 Beta
602 Yaesu/Kenpro GS-232 0.1 Beta
603 Yaesu GS-232B 0.2 Beta
604 F1TE GS232/F1TE Tracker 0.1 Beta
701 WA6UFQ PcRotor 0.1 Untested
801 Heathkit HD 1780 Intellirotor 0.1 Beta
901 SPID Rot2Prog 1.0 Stable
902 SPID Rot1Prog 1.0 Stable
903 SPID MD-01/02 (ROT2 mode) 1.0 Stable
1001 M2 RC2800 0.1.1 Beta
1101 EA4TX ARS RCI AZ&EL 0.1 Beta
1102 EA4TX ARS RCI AZ 0.1 Beta
1201 AMSAT IF-100 0.1 Untested
1301 LA7LKA ts7400 0.1 Beta
1401 Celestron NexStar 0.1 Untested
1501 DG9OAA Ether6 (via ethernet) 0.1 Beta
1601 CNCTRK CNCTRK 0.1 Untested
1701 Prosistel Prosistel D 0.3 Beta
1801 Meade LX200 0.1 Alpha