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

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

Issue 280 Summer 2023

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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

Article	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