BATC Wiki - User contributions [en-gb]

Mapping tools

2019-09-19T13:43:27Z

GI7UGV:

=== Finding the QRA of a site ===

http://k7fry.com/grid/ New site for finding locators to 10 character accuracy by clicking on a map.

=== Lat and Long conversion ===

UK postcode to Lat and Long: https://www.freemaptools.com/convert-uk-postcode-to-lat-lng.htm

Google map based site to find Lat and Long, OS grid reference and address including post code: http://www.gridreferencefinder.com/

=== OS NGR to Lat and Long ===

Convert the OS map 10 digit reference such as TG51401317 to Lat and Long here: http://www.movable-type.co.uk/scripts/latlong-gridref.html

=== Topographic Google map ===

So exactly where are the highest sites near me? Use this Google map based site overlaid with height / topographic data to find out: http://en-gb.topographic-map.com/

===Overlay OS maps===

http://wtp2.appspot.com/wheresthepath.htm

===Portable sites===

[[Directory of portable sites]] Wiki pages describing some sites suitable for ATV and microwave operation

A Google map listing known portable sites [https://www.google.com/maps/d/edit?mid=z8N5Iqirz744.kVguZyvh02SU&usp - please add yours!]

===Radio link and path software===
The software of choice for BATC members is G0MJW Dr Mike Willis' [http://www.mike-willis.com/software.html Microwave Path Profile] available here.
[[File:Cleeve Common to Titterstone Clee Hill.JPG|thumb|G0MJW Microwave Path Profile - here Cleeve Common to Tittlerstone Clee Hill]]
The ASTER mapping data is available after registration with NASA [https://search.earthdata.nasa.gov/search/granules?p=C197265171-LPDAAC_ECS&q=aster&ok=aster on this website]. Tiles of mapping are available for each degree of longitude and latitude - east or west of the Greenwich Meridian. A typical search string for England and Wales of *N52E00* and N52E00* will give an available range of land tiles for the latitude. 5GB of data may be downloaded for N48 to N56 Northern France to Southern Scotland quite easily. The Sites.dat file is a strength of the program to easily enter repeaters, QTH and hill sites for Rx and Tx sites. It's relatively easy to add positions of further hill tops and friends QTHs using positions from Google Earth or e.g. Hillbagging.co.uk to the sites.dat file

A very useful site with "click to see the path" https://www.solwise.co.uk/wireless-elevationtool.html

[https://forum.batc.org.uk/viewtopic.php?f=75&t=5437&p=15405&hilit=line+of+sight+software#p15442 Software used offline /P and at home] is [http://www.ve2dbe.com/english1.html Radio Mobile by Roger VE2DBE]. Roger's website links to the [http://www.g3tvu.co.uk/Quick_Start.htm G3TVU Quick Start guide] aimed at UK users which has UK-tailored versions of Radio Mobile. Ian G3TVU has done a thorough job so set aside an evening for building Radio Mobile UK.

For optical and Line of sight paths see http://www.heywhatsthat.com/

Line of Sight assessments may indeed also be possible in [https://www.usna.edu/Users/oceano/pguth/website/microdem/microdem.htm MicroDEM] by Prof Guth of the Oceanography Dept, US Naval Academy. [http://freegeographytools.com/2007/microdem-a-swiss-army-knife-of-terrain-and-gis-tools Leszek discusses its capabilities here.]

Streaming directly from MiniTiouner

2019-07-29T02:01:12Z

GI7UGV:

Using the UDP output and an ffmpeg batch file it is possible to stream directly from MiniTionuer to the BATC streamer.

Note: this requires a high spec PC and drop outs and audio problems on higher bit rates are likely to be due to processor overloading.

It also requires some knowledge of batch files etc and is therefore not recommended for beginners!

===Configuring MiniTionue software===

* configure MiniTioune to receive signals.

* Edit your minitioune.ini file (found in the same directory as all MiniTioune programs) so that the UDP output is only on 127.0.0.1 and port 1234 - it should look like this:

;=====================================================================
; adresse UDP / UDP address
[UDP]
;=====================================================================
;AddrUDP=230.0.0.1
AddrUDP=127.0.0.1
Port=1234

===Install ffmpeg===

The next step is to install ffmpeg on your PC. Download it from here: https://ffmpeg.zeranoe.com/builds/ Use the release build, 32-bit, static. Unzip the downloaded file and move the files to a folder called ffmpeg on your C:\ drive so that it has the folders bin, docs, licenses and presets inside it.

Now create the windows batch file which will control ffmpeg. Copy the following text in to a text editor (windows note pad etc):

SET ffmpeg="'''C:\Users\fred\Desktop\ffmpeg\ffmpeg-4.1-win32-static\bin\ffmpeg.exe'''"
SET stream='''g8abc-derjky'''
:loop
%ffmpeg% -i udp://127.0.0.1:1234?timeout=100000000 -c:a libmp3lame -b:a 64k -c:v libx264 -b:v 600k -preset fast -f flv rtmp://rtmp.batc.org.uk/live/%stream%
goto loop

You '''MUST''' change the text highlighted in black:

''Set FFMPEG=''"" should have the path to the ffmpeg.exe file on your computer

''SET stream='' Enter your BATC "stream name-stream key" details found on your member's account summary - the 2 fields are separated by a hyphen.

Save the file in the ffmpeg directory as a stream.bat (NOT.txt) and if needed create a shortcut to your desk top.

===Run the program===

Start MiniTioune as normal and set it to receive a signal - then press the UDP button.

Now run the batch file you created. You will probably get a windows firewall message - click allow.

You should now see your received signal appear on your members channel on the BATC streamer.

== Streaming from VLC ==

You can also stream directly from VLC player and by using the VLC screen capture input to feed the MiniTioune display to the streamer.

As it is capturing the full desktop display it will require MiniTioune being left in the foreground on one of the full screen modes but this also might be handy as it also captures the MiniTioune panels.

=== Running===

Alter the callsign-yourkey to match your settings. (Audio's not working though...)

"C:\Program Files\VideoLAN\VLC\vlc.exe" screen:// :screen-fps=25.000000 :live-caching=300 --sout="#transcode{vcodec=h264,acodec=mpga,ab=128,channels=2,sampl
erate=44100}:std{access=rtmp,dst=rtmp://rtmp.batc.org.uk/live/gi7ugv-yourkey,port=1935,mux=flv}"

QO100 DATV Users

2019-07-29T00:59:43Z

GI7UGV:

The list below is maintained by John, G7JTT (g7jtt@yahoo.com) and other BATC Members. Just request a Wiki account if you want to add yourself or other users.

Note that the information may go out of date as stations upgrade (or downgrade) their equipment.

{| class="wikitable"
! CallSign !! Name !! Dish size (m) !! Feed !! Power (W)
|-
| 3B8DU || Jean Marc || 2.4 || Patch || 20
|-
| BG0AUB || Feng Zhao || 0.9 || Dual Patch || 70
|-
| CT1BYM || Miguel || 1.2 || Patch || 80
|-
| CT2GHB || Sergio || 1.8 || Septum || 20
|-
| DC2TH || Wolfgang || 1 || Dual Patch || 70
|-
| DD4YR || Robert || 1.2 || || 30
|-
| DF6IY || Nobi || 2.2 || || 28
|-
| DGØSIA || Oliver || 1.8 || Dual Patch || 24
|-
| DG1MAJ || Roland || || ||
|-
| DG3KHS || Helmet || 1.2 || Dual Patch || 40
|-
| DJ4ZZ || Joerg || 1.2 || Dual Patch || 40
|-
| DL6YEA || Tom || 1.2 || Patch || 25
|-
| DL9OBU || Richard || 3.4 || Patch || 20
|-
| EA3HMJ || Jose || 1.8 || Septum || 40
|-
| EA3NE || Jaume || 1.8 || Helix || 30
|-
| EA4GPZ || Dani || 0.6 || Linear || 100
|-
| EA6WQ || Tomas || 1.2 || Helix || 25
|-
| EB2AT || Aitor || 1.2 || Patch || 50
|-
| EB3FRN || Iban || 2.45 || Horn || 30
|-
| F1SSF || Franck || || ||
|-
| F4FDW || Laurent || 1.4 || || 20
|-
| F4HSL || Yves || 1 || Dual Patch || 60
|-
| F4NAS || Joel || 1.4 || Helix || 80
|-
| F4VSG || Robert || || ||
|-
| F4VTB || Aitor || 1.8 || Patch || 50
|-
| F5OEO || Evariste || 0.8 || ||
|-
| F6DZP || Jean Pierre || 0.8 || ||
|-
| G0KOE || Martin || 1.8 || Helix || 20
|-
| G0MJW || Mike || 2.4 || Dual Patch || 32
|-
| G3ZGZ || Dave || 1.1 || Helix || 25
|-
| G4BVK || Ken || || ||
|-
| G4CPE || Arthur || 1.1 || Dual Patch || 40
|-
| G4EML || Colin || 1 || Dual Patch || 30
|-
| G4KLB || Colin || 1.2 || Patch || 50
|-
| G4UVZ || Adrian || || ||
|-
| G7JTT || John || 1.2 || Dual Patch || 40
|-
| G7NTG || Jim || 1.2 || Dual Patch || 250-300
|-
| G8GKQ || Dave || 1.2 || Dual Patch || 50
|-
| G8GTZ || Noel || 1.2 || Dual Patch || 100
|-
| G8KOE || Martin || 1.8 || Helix || 20
|-
| G8LCE || Martin || 1.1 || Dual Patch || 20
|-
| GI7UGV || John || 1.1 || Dual Patch || 50
|-
| IK1HGI || Tony || 1 || || 30
|-
| IK4IDY || Alessio || 1.8 || Helix || 10
|-
| IK8XLD || Rocco || 1.8 || Dual Patch || 50
|-
| M0DNY || Phil || 1.2 || Patch & Lens || 40
|-
| M0DNY/P || Phil || 0.6x0.8 || Patch & Lens || 40
|-
| M0DTS || Rob || 2.4 || ||
|-
| M0MLJ || Ray || 2 || Dual Patch || 30
|-
| M0SKM || Steve || 1.25 || Dual Patch || 20
|-
| OE6OCG || Richard || 1.8 || Dual Patch || 40
|-
| ON1NH || Hugo || 1.1 || Patch || 100
|-
| ON1WW || Willy || 3 || Patch || 100
|-
| ON4BHM || Guy || 3 || Patch ||
|-
| ON7ATV || Alan || 1.8 || Dual Patch || 60
|-
| PE1CHY || Rob || 1.8 || Patch || 100
|-
| PE1CME || Rob || 2.4 || Patch & Lens || 25
|-
| PE1OZS || Dustin || 1.2 || Dual Patch || 35
|-
| PE2JKO || Joop || 1.1 || Dual Patch || 15
|-
| S52ME || Bojan || 1.5 || Horn || 150
|-
| SQ6QV || Tom || 1.2 || Helix || 150
|-
| SV1BKE || Emanouil || 4.5 || Patch || 30
|-
| SV8RV || Dionysios || 1.6 || Patch || 20
|-
| ZS1MM || Leon || 2.4 || || 10
|}

IARU ATV contest

2019-04-16T08:32:47Z

GI7UGV: /* 2018 contest results */

The most important on-air event of the year is the annual IARU ATV Contest which takes place over the second weekend of June each year.

This is an international contest and ATV operators in all countries in IARU region 1 enter and a table of results is produced showing a league table of entries based on bands used and number of entries from each country.

[[File:2017 contest map.JPG|400px]]

===Who can enter?===

Everyone! You can enter from your home station, from a portable location or a club station - and you don't have to be a BATC member to enter.

You can get on air for an hour on Sunday morning or go out camping on the local hill top for the whole weekend!

The rules allow for “roving” stations, so there is no reason why you should not operate from home on one day, and go out portable on another, or even use multiple portable sites. Just remember to use new 4-digit codes from each location '''and to ask for new codes''' from any station that you have worked before.

===What Bands are in Use?===

The IARU region 1 Contest includes all harmonised amateur bands above 400 MHz.

Note: Only the UK have the 146MHz band and it is not included in the contest.

===What do I send and how is the contact confirmed?===

The basic aim is to send a 4 digit code and have it successfully received - you'll find that most receiving stations add the 4 numbers to together and tell you the sum as confirmation that they received them.

The numbers in the 4 digit code should not be the same or consecutive: 4752 is OK, but 2345 or 2222 are not and you need to send a different set of numbers on each band you transmit on.

The numbers can be scribbled on a piece of paper, loaded in to a .jpg and played out as video or computer generated. The Portsdown system can automatically generate a different set of numbers for each band, but you need to set the numbers before the Contest. The default Portsdown numbers are not valid for contest use; full details of how to set them are here: [[Portsdown Contest Numbers]].

===Signal reports===

Contest reports use the P scale for reporting ATV signal readability: The P report is followed by a sequential 3 digit serial number for the contact. For example for your first contact on 23 cm you might send the report P4001, and for the second contact P5002.

Start the serial number from 001 for each band; if you are unsuccessful in receiving pictures, you should send back a report such as P0003. This ensures that your attempt at a contact appears in the log.

[[File:p reports.JPG|400px]]

Note that if you receive numbers from another station, he must be at least P2. You won't get any points for P1 reports!

===How do I know other people are on the air?===

The easiest way to co-ordinate and set up contacts is by calling / listening on 144.750MHz FM.

Most stations will also submit proposed activity plans on the BATC forum - the 2018 plans are here: https://forum.batc.org.uk/viewtopic.php?f=75&t=5427

DXSpot.TV https://www.dxspot.tv/ was set up to co-ordinate ATV contacts and have a real time chat room where you can message other ATV operators directly - we suggest you register for an account before the contest.

You can access the DXSpot.TV chat room over low bandwidth (2G?) links using this address: https://www.dxspot.tv/chat/

===Time of contest===

The contest rules refer to times in UTC: this is Universal Coordinated Time (the abbreviation comes from the French translation which is internationally accepted). Many of us will know this as Greenwich Mean Time (GMT), which is the clock time in the UK during the winter, but one hour behind in the Summer when we use British Summer Time (BST). This is why the International Contest starts at 1pm and finishes at 7pm for us. UTC should be used for the contest log.

===Submitting an entry===

While the important thing is that you get "on the air" at sometime over the weekend, it would be great if you also took the time to submit an entry, even if it is only for a single 5KM QSO across town using the 5665MHz drone equipment you just got working! That way we can show to Ofcom and other users that there is real activity on the ATV bands and also so the UK can have highest number of entries in the contest!

Ideally you will submit an entry on the official Excel Spreadsheet which you can download from here here [https://www.iaru-r1.org/images/VHF/atv/ATV_contest_log_-_ATV_yourcall_YYYYMMDD.xls https://www.iaru-r1.org/images/VHF/atv/ATV_contest_log_-_ATV_yourcall_YYYYMMDD.xls]

Note that you must "Enable Macros" to allow all the calculations in the spreadsheet to work.

Once you have completed the entries please email them to contests@batc.tv.

Alternatively, simply email in a list of your contacts including times, frequencies, callsigns, locators and numbers sent and received to contests@batc.tv.

===Contact scoring===

When you submit an entry your contact will be awarded a score based on these rules:

A two-way exchange of the four-digit code group by vision together with the exchange of the other information shall score:
* For contacts on the 146 MHz band: 2 points/kilometre (BATC Contest only)
* For contacts on the 435 MHz band: 2 points/kilometre
* For contacts on the 1.3 GHz band: 4 points/kilometre
* For contacts on higher bands: 10 points/kilometre

One way QSOs, for example where someone only has a receiver, do count and are awarded half points for both stations and you can claim points for a QSO even if the other station does not submit an entry.

Note that for scoring purposes, all valid contacts shall be deemed to have taken place over a distance of at least 5 kilometres, even if the two stations in contact have the same or adjacent IARU locators.

Reports of P1 do not allow for exchange of numbers - so make sure that all point-scoring contacts are at least P2!

===2018 contest results===

The international 2018 IARU ATV contest results can be found [[IARU_ATV_contest_2018_International_Results|here]].

And a full list of the UK results can be found [[IARU_ATV_contest_2018_Results|here]].

===2017 contest results===

The 2017 contest results are available here https://vhf-uhf.veron.nl/wp-content/uploads/2015/08/IARU-ATV-results-2017.pdf

Congratulations to Rob M0DTS for the top UK entry and to Terry G1LPS for winning the overall 9cm section for the third year in succession!

The number of stations entering the contest is increasing each year:

2014 = 33

2015 = 42

2016 = 52

2017 = 95

===Are There Any Prizes?===

Not for the IARU contest - however for the 2018 Contest the BATC made the following awards to UK-based stations:

* A £50 Amazon Voucher to the winner of the BATC 146 MHz Contest
* A £50 Amazon Voucher to each station in the Best DX 2-way 5.6 GHz contact
* A £50 Amazon Voucher to the transmitting station using a Portsdown system received at the the furthest distance (any band).

Awards will be presented during the BGM at CAT 18 (on the Sunday).

===More information===

The latest Rules for the International ATV Contest can be downloaded here [[Media:2018_ATV_Contest_Rules.pdf]](.pdf).

The Contest Manager can be contacted on mailto:contests@batc.tv

Webcam Support

2019-03-11T09:28:52Z

GI7UGV: /* Compatibility */

Portsdown software version 201803061 introduces proper support for some Logitech Webcams. The only versions tested so far are the Logitech C170 (a very old basic 640x480 device), the Logitech C310, the Logitech C525, the Logitech C910 and the Logitech C920 (full HD with internal H264 encoding).

===Compatibility===

In Portsdown Stretch (pre 201902072), the use of a Webcam with the RPi Camera connected requires that the webcam is unplugged at boot, and only plugged in once the Portsdown has booted up. This is because of an incompatibility between the way that the RPi Camera drivers are loaded and the way that the Webcam drivers are loaded. There is no issue if the RPi Camera is not connected.

Note that if you do boot-up with the Webcam and Pi Camera both connected, the Portsdown will not cleanly shutdown. It hangs half-way through shutdown, but may then be safely powered off.

The incompatibility issue has been resolved since Portsdown Stretch update 201902072 and the two cameras should now co-exist.

===Normal Webcam Modes===

In the normal webcam modes, the webcam acts just the same as any video source and can be encoded in MPEG-2 (with audio) or H264 (without audio). Some Webcams will also work at 576p and 720p widescreen resolutions.

The normal Webcam modes have been tested with The Logitech C170, C525, C910 and C920. They should work with the Logitech C270. If you have another Logitech webcam that you would like included please report it on the BATC Forum and we will try to modify the software for compatibility.

Selecting Webcam as the source from the source menu will take the video input from the Webcam and output it at close to the selected resolution. Many Webcams are limited to set resolutions and you may find that the image size produced in 4:3 mode is 640x480 rather than 720x576. The mono audio from older webcams is reproduced as a single channel and the stereo audio from the C910 and C920 is reproduced as stereo (in MPEG-2 modes).

At the end of a transmission using the Logitech C270, C525 or C910 the camera driver needs time to be reset. During this 3 second reset process, the touchscreen does not respond to commands. After the reset, the touchscreen is re-enabled.

===C920 H264 Webcam Mode===

The Logitech C920 can output H264 encoded video with audio at a fixed bit rate. The Portsdown software has been modified to accept this stream and transmit it. Just select C920 as the video source, H264 encoding and then select the resolution that you want. As the stream is at a fixed bit rate of 3.4 MBit/s (for all resolutions), the Portsdown needs to be set up to transmit at 2MS or more, 7/8 FEC. TRANSMISSIONS AT LOWER SRs and FECs ARE UNLIKELY TO WORK.

C920 Webcam

2019-03-11T09:19:14Z

GI7UGV: /* Compatibility */

===Using the C920 Webcam With the Portsdown===

[[File:Logitech C920.jpg|400px]]

The Logitech C920 Webcam can be used with the Portsdown transmitter for both video and sound. It can be used in 3 modes: as a normal webcam providing images for MPEG-2 transmission with sound (either SD or 720p), as a normal webcam with H264 SD pictures (but no sound) being encoded by the Raspberry Pi, or using its internal H264 encoder to transmit pictures at SD, 720p or 1080p with sound. For internal H264 encoding modes, the bitrate is fixed and the Portsdown MUST be selected to 2 MS or more, 7/8 FEC (or DVB-S2 16APSK 7/8 FEC 1 MS) for this to work.

===Compatibility===

In Portsdown Stretch (pre 201902072), the use of a Webcam with the RPi Camera connected requires that the webcam is unplugged at boot, and only plugged in once the Portsdown has booted up. This is because of an incompatibility between the way that the RPi Camera drivers are loaded and the way that the Webcam drivers are loaded. There is no issue if the RPi Camera is not connected.

The incompatibility issue has been resolved since Portsdown Stretch update 201902072 and the two cameras should now co-exist.

===Power Requirements===

The C920 is quite power-hungry and can be the straw that breaks the Camel's back in the RPi power budget, leading to under-voltage events with unpredictable consequences. For best results, use a powered USB Hub, or at least make sure that your RPi PSU is up to the job. Remember that you can check if there have been any power events from the Info screen on Menu 2.

UK ATV DX Records

2019-01-09T14:49:26Z

GI7UGV: /* 6cms (5.6GHz) */

This is a record of the UK DX records for each band. As well as the current record, it lists some previous records.

They are not complete and are based on trawling the forum activity pages and recent contest results - please update or let us know if you know better.

Note, these are UK records only (at least one of the stations involved was located in the UK) and only lists significant one way contacts.

World records are claimed based on the W6HHC list.

==World DATV records==

Ken W6HHC, maintains the record of the world DATV records here: http://w6ze.org/DATV/Known-DATV-DX-Records_2018.pdf

Please send Ken an e-mail if you know of a DATV QSO that should be added to this list! (via W6HHC@ARRL.net)

==50MHz==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!! Comments
|-
| 10-12-2014|| 4.5 kms || M0SKM || IO91RV || G4CPE || IO91SW ||543Ks||
|-
| 08-11-2018|| 7.5 kms|| G8GTZ/P|| IO91KD - Wield || G8LES || IO91LC ||333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=5719 Forum report]
|-
| 26-12-2018|| 228 kms || G4FRE || IO82UC - Malvern || G0FRE/P || JO01JK - Isle of Sheppey ||250Ks||One way only [https://forum.batc.org.uk/viewtopic.php?f=76&t=5794]
|}

==71MHz==
UK only
{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode !!Comments
|-
| 25-07-2018 || 59 kms || G8VPG/P|| IO81LS - Blorenge || G4BVK/P || IO81TK - Togg Hill||333Ks||[https://forum.batc.org.uk/viewtopic.php?f=75&t=5566 Forum report]
|-
| 14-09-2018|| 136 kms|| G8VPG/P|| IO81FE - Dunkery Beacon || G8BVK/P|| IO81XW - Cleeve common ||333Ks||[https://forum.batc.org.uk/viewtopic.php?f=75&t=5628 Forum report]
|-
| 09-12-2018|| 160 Kms|| G8GTZ/P|| IO80WX - Win Green || G4FRE/P|| IO82QJ - Clee Hill|| 125Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=5764&p=17639#p17639 Forum Report]
|-
| 27-12-2018|| 230 kms || G4FRE || IO82UC - Malvern || G0FRE/P || JO01KK - Isle of Sheppey ||250Ks||One way only [https://forum.batc.org.uk/viewtopic.php?f=76&t=5795]
|}

==146MHz==
UK only band released for amateur use on October 10th 2014
{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| 30-12-2014 || 3.6 kms || G4CPE || IO91SW || G0WFT || || 333Ks||First One way
|-
| 11-01-2015 || 28 kms || G0LPS || IO94EQ || M0DTS || || 333Ks||First 2 way QSO
|-
| 21-02-2015 || 50 kms || G0LPS || IO94EQ || M0DTS/P || || 333Ks||
|-
| 13-06-2015 || 95 kms || G8GTZ/P || IO91GI - Walbury Hill || G4CPE || IO91SW || 333Ks||
|-
| 13-06-2015 || 115 kms || G0LPS || IO94EQ || M0DTS/P || || 333Ks||
|-
| 11-06-2016 || 121 kms || G8VPG/P || IO81LS - Blorenge || G8GKQ/P || Walbury - IO91GI || 333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=4519&start=20#p10748 Report]

|-
| 03-09-2016 || 169 kms || G8VPG/P|| IO80WX - Win Green || G8GTZ/P || IO82QL - Brown Clee || 333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=4684&start=20 Report]
|-
| 03-09-2016 || 182 kms || G8GTZ/P|| IO82QL - Brown Clee || G8GKQ/P || IO80UU - Bulbarrow || 333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=4684&start=10#p11046 Report]
|-
| 11-12-2016 || 185 kms || G8GTZ/P || IO90JO - Ventnor|| G8VPG/P || IO81LS - Boringe || 333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=4759&start=20#p11437 Report]
|-
| 29-12-2016 || 277 kms || G8GTZ || IO91KF || G0MJW || IO83RO || 333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=4775&start=10 Report]
|-
| 30-12-2016 || 294 kms || G8LES || IO91LC || G0MJW || IO83RO || 333Ks||
|-
| 14-07-2018 || 313 kms || GI7UGV/P || IO74AU || G4CBW || IO83UB || 333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=5453 Report]
|-
| 24-10-2018 || 407 kms || M0DTS/P || IO94MJ || G4UVZ || IO80KX || 333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=5693&start=10 Report]
|-
|}

==70cms==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| 24-09- 2013 || 696 kms || G8GTZ || IO91KH || F1FY || JN16VB || DATV ||2 way QSO over 24 hour period! '''World record'''
|}

==23cms==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| October 2010 || 440 kms || G4KLB || Bournemouth || M0DTS || Yarm || DATV|| '''World Record'''
|}

==13cms==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| 9 June 2018 || 85 km || G8GTZ/P || IO90LX Wether Down || G8GKQ/P || IO80WP Lulworth || 1 MS DATV ||
|}

==9cms (3.4GHz)==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| 09-06-2017 || 51 kms|| G1LPS || IO94EQ || M0DTS/P || IO94DF - Masham || DATV||
|-
| 10-06-2018 || 154 kms|| GW4CBW/P || IO83FD - Blychau || G3NWR/P || IO84ML - Kirkstone || DATV||
|}

==6cms (5.6GHz)==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| 09-06-2017 || 80 kms || G8GTZ/P|| IO80WP - Povingdon Hill || G8GKQ/P || IO90LU - Portsdown Hill || ATV ||
|-
| July 2017 || 88 kms || G8GTZ/P|| IO90LX - Wether Down || G8GKQ/P || IO80WP - Povingdon Hill || ATV ||
|-
| 29-08-2017 || 138 kms || G8GTZ/P|| IO81FE - Dunkery Beacon || G8GKQ/P || IO81XW - Cleeve common || ATV|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=5127#p13573 Report]
|-
| April 2018 || 153 kms|| GW3NWR/P|| IO83FD - Blychau || M0KPW/G0HIK/P || IO84ML - Kirkstone || ATV ||
|-
| 09-05-2018 || 158 kms || G4NJJ/P || JO02OW - East Runton || G8AGN / G0RPH/P || IO94VB - Bridlington || ATV || [https://forum.batc.org.uk/viewtopic.php?f=75&t=5468 Report]
|-
| 29-06-2018 || 159 kms || GI7UGV/P || IO74DN - Scrabo || G0HIK / M0KPW/P || IO84IH - Corney|| ATV ||[https://forum.batc.org.uk/viewtopic.php?f=75&t=5538 Report]
|-
| 05-07-2018 || 180 kms || GI0GDP/P || IO74AU - Larne || G0HIK / M0KPW/P || IO84IH - Corney || ATV ||[https://forum.batc.org.uk/viewtopic.php?f=75&t=5545 Report]
|-
| 25-10-2018 || 190 kms|| G8GTZ/P || IO81XW - Cleeve Common || G3NWR/P || IO83RO- Winter Hill || ATV||[https://forum.batc.org.uk/viewtopic.php?f=75&t=5693&start=10 Report]
|-
| 25-10-2018 || 370 kms || G8VPG/P || IO81QF - Mendips || M0DTS/P || IO94MJ - NY Moors || ATV ||[https://forum.batc.org.uk/viewtopic.php?f=75&t=5693&start=10 Report] - '''World record'''
|}

==3cms (10GHz)==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| 03-07-2016 || 93 kms || G8GTZ/P|| IO91GI - Walbury || G8GKQ/P || IO80WP - Povingdon || 333 Ks||
|-
| 27-08-2017 || 136 kms || G8GTZ/P|| IO81FE - Dunkery Beacon|| G8GKQ/P || IO81XW - Cleeve Common || 333 Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=5127#p13573 Forum] ||
|-
| 25-10-2018 || 407 kms || M0DTS/P || IO94MJ - NY Moors || G4UVZ || IO80KX || 2Ms DATV|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=5693&start=10 Forum report]
|-
|}

==24GHz==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| 11-06-2017 || 51 kms|| G1LPS || IO94EQ || M0DTS/P || IO94DF - Masham || DATV||
|-
| 10-06-2018 || 85 kms|| G8GTZ/P || IO90LX - Wether Down || G8GKQ/P || IO80WP - Povingdon Hill || DATV||
|}

==47GHz==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| December 2017 || 30 km|| G4FRE ||IO82UC - Malvern || G4FRE/P || IO92BA - Broadway || 1 Ms/s || One way only - [https://forum.batc.org.uk/viewtopic.php?f=75&t=5321 Forum report]
|}

==76GHz==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!! Comments
|-
| 09-06-2018 || 12 kms || G8GTZ/P || IO90LX - Wether Down || G4LDR/P || IO90LU - Portsdown Hill || 250Ks RB-TV|| '''World record'''
|}

==134GHz==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Comments
|-
| Example || || || || || ||
|}

Bloringe Mountain South Wales

2019-01-09T10:46:38Z

GI7UGV: GI7UGV moved page Bloringe Mountain South Wales to Blorenge Mountain South Wales: Page orphaned page as title spelled incorrect and directory link broken

#REDIRECT [[Blorenge Mountain South Wales]]

Blorenge Mountain South Wales

2019-01-09T10:46:37Z

GI7UGV: GI7UGV moved page Bloringe Mountain South Wales to Blorenge Mountain South Wales: Page orphaned page as title spelled incorrect and directory link broken

'''Location'''

[[File:Bloringe 1.PNG||thumb|Blorenge take off to the East / South East]]

[[File:Bloringe 3.PNG||thumb|Blorenge take off to the North East]]

QRA = IO81LS

Latitude 51.790796 N longitude 3.069674 W

Elevation 1697 ft above sea level

'''Site take off'''

Very good to the East and South - blocked to North and North east

Link to [http://www.heywhatsthat.com/?view=R0PJRV9K Heywhatsthat] profile page.

[https://www.google.com/maps/@51.7902786,-3.0695621,3a,75y,106.41h,94.21t/data=!3m6!1e1!3m4!1s37E2c76298Kl2Zf3sw10sg!2e0!7i13312!8i6656 Google Street view]

'''Access'''

Very good drive on car park.

'''Facilities'''

Car Park only - a few bushes

'''Useage'''

Very busy

'''RF environment'''

TBD

Mobile data coverage - Vodafone 3 and 4G

'''Restrictions'''

None

'''Last updated'''

{{REVISIONUSER}}

{{REVISIONDAY2}}/{{REVISIONMONTH}}/{{REVISIONYEAR}}

Return to [[Directory of portable sites|site directory page]]

5.6 GHz

2019-01-09T10:39:17Z

GI7UGV: /* Activity hot spots */

[[File:5.6 GHz Orientation Small.jpg|300px|center]]
It is very easy (and low cost) to get on the air on 5.6GHz (the 6 cm amateur band), using the cheap modules intended to transmit “First Person Video” (FPV) back from drones to their operators. These units can be used without any modifications to get on air, and with simple WiFi plate or dish antennas (and a clear line of sight path) can be used to send pictures to stations using the same equipment over paths in excess of 50km.

M0KPW has an excellent website describing his 5.6GHz system http://www.5-6ghz-atv.co.uk/

==Frequency choice==

The overall UK amateur band plan is shown on the RSGB website here: https://rsgb.org/main/operating/band-plans/. As the UK amateur frequency allocation for 5 GHz is not contiguous spectrum, the RSGB has some [https://rsgb.org/main/operating/band-plans/microwaves/5-7-and-10ghz/ useful guidance] which is adapted below with arrow markers:-

[[File:bandplan.JPG|800px]]

GB3KM has a licensed input on 5665 MHz and this has been chosen as the primary ATV operating frequency. Audio WB-FM operators have been using 5825 and 5840 MHz. 5825 MHz is too close to the band edge for ATV, and 5840 MHz is marginal. So 5665 is the general ATV preference

The FPV equipment receive and transmit frequencies are set using DIP switches, and most tune to 5665 MHz – but care needs to be taken when selecting equipment to make sure it does cover this frequency. Example channel tables are shown at the bottom of this page.

==Equipment==

The FPV units are widely advertised on eBay and other sites with titles similar to “Tarot 5.8G 600MW Telemetry TX/RX Combo for FPV Image Transmission TL300N” and are available at reasonable prices. The typical units are very small but have reasonable FM-TV performance with a quoted transmitter spec of 600mW output and receiver sensitivity of -80dBm. Amplifiers are available to raise the output power to 2 watts or more.

[[File:Tairot 1.jpg|400px]]

Be aware – we have found that on some receiver units, the video output is on the Red phono lead and not the expected Yellow lead!

Some other users' stations are described here [[5.6 GHz Equipment Examples]].

===Mounting the equipment===
Due to the very high losses in co-ax cable at 5.6GHz it is recommended that you mount the units very close to the antennas and run long 12V dc, audio and video cables back down to the shack or operating position.

Be aware also, that whilst these units are very small they do run very hot in operation, and it is suggested that you provide a good heatsink for both Tx and Rx – mounting them in a diecast box on the back of their respective antennas is ideal.

[[File:GKQ 5.6v2.JPG|600px]]

Details of G8GKQ's transceiver setup is shown here (receiver unit on left & transmitter with fan on the right)

===Transmit amplifiers===

Whilst the basic units work very well and have been used to transmit over paths of 60km, power amplifiers to boost the 600mW transmitter signal to 2—4 Watts are available from several suppliers on eBay and other sites, and will significantly increase the path length that the units will work over. These amplifiers should be connected after the transmit unit, but before any antenna change over relay(s) – and remember that his will increase the volt drop on any long 12V cable feeding the transmitter at the masthead.

Be warned!! Several users have found these PAs to be "fragile", so you should always make sure that the antenna is connected – and all connectors done up tight – before applying dc or RF power. We are investigating whether they can be made more reliable by reducing the volts / input drive.

[[File:56PA.jpg|200px]]

==Antenna changeover relays==

The FPV equipment comes as separate Tx and Rx units. In order to operate on a single antenna, you will need an antenna changeover relay. Note, however, that the losses at 5.6GHz can be significant and care must be taken when wiring up the units to ensure RF cables are of good quality, and kept to a minimum length – semi-rigid cables fitted with SMA connectors are ideal.

PL259 and even BNC connectors are very lossy at 5.6GHz and should not be used, but the surplus SMA relays often available at rallys are ideal for 5.6 GHz.

See [[Antennae changeover relays|this wiki page]] for more details on suitable relays, 24 volt operation, and 4 port (or transfer) relays.

If no suitable relay is available, it may be cheaper to use separate antennas for receive and transmit as shown in the picture below – note the Tx and Rx units are mounted directly on the back of the flat panel antennas.

[[File:562.jpg|200px]]

===Reverse SMA===

Be aware that all the 5.6GHz FPV units use "reverse SMA" connectors (as used on WiFi equipment) and that all low-loss cables (unless bought specifically for the purpose) and surplus SMA relays will almost certainly have standard SMA connectors – which will not fit. Adapters from reverse to standard SMA are available on eBay or other suppliers – search for "RP-SMA to SMA adaptor" or similar wording.

==Antennas==

As 5.8GHz is used by broadband wireless networks, there is a wide choice of antennas available for use on 5.6GHz ATV. These can range from flat plates/panels to wire mesh (grid) dishes, as seen in the above pictures.

Horizontal polarisation has been chosen as the standard (waveguide feeds needs to have the long dimension of the aperture – and/or horn – vertically oriented when feeding dishes)

=== Satellite dishes ===

It is also possible to use a satellite mini dish with a suitable feed, such as a waveguide/horn to the design by G4NNS – see here for construction details: http://myweb.tiscali.co.uk/g4nns/FeedHorn.html

The picture shows a Sky mini dish fed with a WA5VJB log-periodic PCB feed http://www.wa5vjb.com/products1.html – these are available in the UK from G4DDK. http://www.g4ddk.com/Prices.html

Dishes of this size typically have a beam width of 4—8 degrees.

[[File:56 dish feed.JPG|400px]]

M1BKF found a very interesting 5.6GHz feed for standard f/d ratio satellite dishes; it contains what looks like a PCB yagi, and is available from:

<s>http://www.antennas-amplifiers.com/5.1-5.5-5.8GHz-WLAN-WiFi-Antenna/Feed-Illuminator-satellite-offset-dish-fd-0.5-0.8</s>

https://www.antennas-amplifiers.com/feed-Illuminator-satellite-offset-dish-fd-0.5-0.8

[[File:PCB dish feed.JPG|200px]] [[File:PCB dish feed2.JPG|300px]]

=== DIY BiQuad antennae ===

This web page http://buildyourownantenna.blogspot.co.uk/2014/07/double-biquad-sector-antenna-for-5-ghz-wifi.html has a well engineered double BiQuad antenna with a quoted 13dBi gain.

Note in the picture G8JAN has directly connected the Tx module to the antenna to avoid co-ax losses.

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

==Video equipment - Rx==
The receiver output will need to be directly connected to a monitor with a composite video input to view the received the signal – normally on a yellow phono or RCA connector.

===Video squelch defeat===

Beware of using modern flat-screen monitors which have a video squelch – these will not display noisy signals, and just give a blue screen until they get a strong video signal.

There are a number of circuits around to defeat the squelch and also improve the readability of the signal.

===Syncsmurf by PE1RQM=== – kits are available; details on the [https://translate.google.com/translate?hl=auto&sl=auto&tl=en-US&u=https%3A%2F%2Fwww.pe1rqm.nl%2Fsyncsmurf2%2F webpage here].

[[File:syncsmurf1.jpg|200px]]

Results are very impressive:

[[File:syncsmurf2.jpg|400px]]

===eachine FPV recorder===

Several people have reported that they are using these devices, available from various sites, and as well as defeating the monitor blue screen by inserting syncs on noise they have a single push button record facility. They record to an SD card which can be removed and the files viewed on a PC; users report that you need to use a good quality SD card, and that they have had problems with Kingston branded cards – Sandisk are preferred.

[[File:emachine dvr.JPG|300px]]

===Video sync processor===

[[File:cqtv 129.jpg|300px]]

Or any video sync processor may be usable such as the Advanced Converter Enhancer used by many stations on 23cms FM TV transmissions.

[[File:ACE.jpg|300px]]

==Video equipment - Tx==
An old camcorder with a yellow phono "video out" socket is an ideal video and audio source for the transmitter.

Don't forget that you will need to display your call sign to remain legal. This can be a video generator, a .jpg card reader with video out, or a piece of card with your call sign scribbled on it!

===Media card reader===

A simple way to generate test patterns is to use a media card reader loaded with .jpg files – these are available on several sites, just search for "SD card media AV player" – but make sure you get one which outputs PAL video.

[[File:av player.JPG|200px]]

===PicDream===
The PicDream project uses a single PIC chip and a 4MHz crystal to generate a black and white test pattern – simple but effective – the original project was described in CQ-TV 180 and re-printed in CQ-TV 247.

[[File:Picdream 247.JPG|400px]]

The PIC code is available for download here: batc.org.uk/cq-tv/software/picdream.zip

===PicDream II===
The PicDream II project uses a PIC chip and an AD724 PAL ecnoder chip to generate a colour test pattern with moving insets. The text and colours on the test pattern can be set through it's serial link.

Further information is at https://github.com/F1CJN/PICDREAM-II

===Raspberry Pi - PA3CHM image generator===

CQ-TV 247 published details of a simple RPi-based test card generator by Ernest PA3CHM.

[[File:PA3chm.JPG|400px]]

Full details are on his website: http://www.pa3hcm.nl/?p=248

===Raspberry Pi - Portsdown patterns===
The BATC Portsdown project can be configured to deliver composite video and audio out from the RPi multi-jack plug.

[[File:GKQ July 2017 (Small).JPG|400px]]

This can be test patterns, RPi desktop, or the Portsdown camera and microphone – [[Analog Video Output|see this wiki page for more details]] making the RPi the only piece of video/audio equipment you need to drive the 5.6GHz transmitter.

===Stand alone Raspberry Pi animated test card generator===
This is the stand alone version of the animated test card generator that is part of the Portsdown software
[[RPi Test Card| - see this wiki page for more details]]

==On the air==

Using dish aerials of 30—60cm, line of sight ranges of 80km can easily be achieved.

P5 (noise free) FM ATV pictures have been exchanged over a 138km path using the equipment described on this page – the picture below shows G4CPE/P on Dunstable Downs being received at the Ridgeway, near Didcot, over a slightly obstructed 66km path.

[[File:CPE 5.6GHz.JPG|400px]]

Dunkery Beacon near Minehead, to Cleeve Common near Cheltenham.
The picture shows G8GTZ/P received by G8GKQ/P over the 138km path.

[[File:snap5 small.jpg|400px]]

2018-04-21: The UK "record" for a contact using standard FPV units was increased to 153km between GW3NWR/P at Bylchau, North Wales to M0KPW/P and G0HIK/P at the Kirkstone Pass Inn, Cumbria.

This has since been surpassed.

==FM voice only==

Several stations in the Gloucester and Bolton area are using these units for wideband FM voice only. This is achieved by simply putting high level (1V peak-peak) audio on the yellow video TX phono input – this modulates the main high level carrier with audio rather than video (the two audio phono connectors – red and white – can be ignored). On RX, the yellow phono connector of the receiver is simply connected to a line level input of an audio amplifier.

It is done this way because the two audio subcarriers transmitted by the unit are at a level 20dB lower than that of the main (video)carrier. However, as it is using the same bandwidth Rx and Tx system, performance will be no better than FM video – ideally the 480MHz RX IF would be tapped off in to an SDR or narrow band receiver to give significantly enhanced (+20db?) narrow band performance.

==Activity hot spots==

There is a Google map showing approximate locations of stations thought to be active on 5.6GHz FM – if you are on 5.6GHz, you can add or edit your station: https://www.google.com/maps/d/u/0/edit?mid=1e4keFSFWy6wLUQNF3IT3n6h90eU&ll=52.39133141509076%2C-1.8917942000000494&z=7

Known users include:

*Southern England = G8GKQ, G8GTZ, G0UHY, G8XZD, G4UVZ, G3VPF
*Dunstable area = M0SKM, G4CPE, G0WFT
*North-East = GB3KM, G1LPS, M0DTS
*Cheltenham = G0LGS, M0RKX and G4NZV (using WB audio only)
*Bolton Wireless Club = G4JLG, G6GVI, G8PEF, M0UFC, MW1FGQ (PW “Siren” Article)
*Ludlow, Shropshire = G8XYJ
*Yorkshire = G8BYN
*Norfolk = G4NJJ, G8JAN, G4WVU and M1BKF
*Cumbria - Barrow-in-Furness Radio Club project
*Merseyside - G3NWR
*Northern Ireland = GI4DOH, GI3VAF, GI0GDP, GI7UGV

[[File:cpe2.jpg|400px]]

==More information==

Dave G8GKQ did a presentation at the BATC annual convention CAT17 in September 2017 on getting started on 5.6GHz ATV.
*The presentation is available here https://wiki.batc.tv/images/4/42/CAT17_5.6_GHzv2.pdf
*The video of the session is available on the BATC YouTube channel here https://www.youtube.com/watch?v=XJzGNsGmE9Y

==On line support / social media==

There is a thread running on the BATC forum where the ATV community are exchanging ideas and also posting results of the latest on air tests. https://forum.batc.org.uk/viewtopic.php?f=2&t=5026

Note that the BATC core team do not regularly visit Facebook pages - time is just too short to monitor everything and it's not easy to follow threads on Facebook.

==Technical information==

===SM201R===
The large RX chip in most units has had the part number removed, however it appears that a lot of receivers use the SM201R module. The spec and pinout are shown below but notice the frequency range of this particular unit does not seem to cover 5665MHz, so make sure the one you buy does!

[[File:sm201r 2.jpg|500px]] [[File:sm201r 3.JPG|200px]]

[[File:sm201r 1.JPG|500px]]

===S meter output===

Looking at the above table, it appears that the RSSI is available on pin 17 of the SM201R and could potentially be used for a signal strength meter to help align the antennas when setting up a QSO.

It also appears that the SM201R uses a 480MHz IF (same as the Comtech) and potentially could be modified with narrower filters to improve RF performance.

====Tx and Rx perfomance====

Initial measurements suggest the TX bandwidth is 25—30MHz.

[[File:5.6GHz spectrum.jpg|500px]]

This accounts for the quoted RX sensitivity at -80dBm which may be improved by an LNA but will ultimately be limited by the RX IF bandwidth.

===Channel Listings===

As mentioned above, the channel settings vary from manufacturer to manufacturer. This table is taken from the Tarot data sheet which uses the SM201R module but does include 5665MHz:

[[File:Tarot_Channels.jpg|603px]]

And this is the table for the Eachine TS835 transmitter:

[[File:Channels_2.jpg|619px]]

This table is from a "Fat Shark" transmitter that does not cover 5665 MHz:

[[File:Fat_Shark.PNG|300px]]

==Improvements to Commercial Units==

In CQ-TV 260, Achille I2GLI described improvements and additions to the Mateksys VTX-HV drone transmitter to make a high quality 18 watt output 5.6 GHz FM transmitter. One of the improvements was to replace the video and sound baseband circuitry. The published circuit diagram in online CQ-TV was a little unclear (although the printed version is good). The circuit diagram is reproduced below.
[[File:BandaBase.jpg|672px]]

BATC Wiki

2019-01-09T10:26:45Z

GI7UGV: /* Getting on the air with ATV */ 70cm link not linking to existing page

'''Welcome to the British Amateur Television Club Wiki''' - the place to find information on on all Amateur Television related equipment and projects.

''This is a reference library - please use the [https://forum.batc.org.uk/ BATC forum] for discussion on these or any other items.''

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 please observe any copyright restrictions on your material you use. However, before you can add or edit content you will need to [[Registering|register for an account]].

== Contents ==
* [[Registering]] on the BATC wiki
== New to Amateur TV? ==
* Glossary and index of terms and TLAs used in Amateur Television [[Glossary of terms|Glossary of terms]]
* Get the basics in our collection of [[Getting Started|Getting Started guides]]

== BATC Information and services==
* The [[new BATC website]]
* [[Joining the BATC]]
* [[Renewing your membership]]
* The [[BATC Privacy statement and data protection policy]]
* The original [[BATC.TV video streaming service]] - pre May 2018
* The [[BATC video archive]]
* The [[BATC forum]]
* The [[BATC shop]]
* The [[WordPress Streaming Parameters]]

== CQ-TV Magazine ==
* [[Index of articles]]
* [[Archive edition|Archive editions]] download
* [[Project software]] download

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

== BATC Conventions ==
* [[CAT 18]] Presentations and links to the videos from the 2018 convention.
* [[CAT 17]] Antenna test range results, presentations and links to the videos from the 2017 convention.
* [[Presentations from CAT 16|CAT 16]] Presentations and links to the videos from the 2016 convention.
* Video Recordings from previous ATV Conventions can be found on the [https://www.youtube.com/channel/UCUWLnUZllytlcCFd93tnBzw BATC YouTube Channel].

==International Events==

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

== Getting on the air with ATV ==
The ATV bands:
* [[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)

Equipment Options
* [[DATV transmitting Equipment]]

== Operating ==
* [[ATV standards]] - a list of standards used by ATV operators including FM bandwidths, DATV PIDs, symbol rates and FEC
* [[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
* [[Christmas 2018 BATC Repeater Activity Contest]]
* [[IARU ATV contest]] - How to enter the annual international TV contest
* [[IARU ATV contest 2018 Results]] - UK Results for the June 2018 IARU and BATC Contests
* [[IARU ATV contest 2018 International Results]] - International Results for the June 2018 IARU Contest

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

* [[Technical topics for ATV repeater builders]]

==Es'hail-2==

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

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

* [[Es'hail-2 LNBs and Antennaes]]

== ATV construction projects ==
* [[The Portsdown Transmitter]] - the BATC's Raspberry Pi-based DATV Transmitter
* [[MiniTioune]] - the DATV USB receiver project
* [[Receiver upconverters]] - Details of upconverters to receive 146 and 437 MHz on STB and MiniTioune
* [[Digilite]] - The original home build DATV construction project
* [[DigiThin]] - plug in QPSK modulator module for Rpi
* [[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
* [[RPi Test Card]] - Raspberry Pi based Animated Test Card Generator
* [[PE4302]] - PE4302 variable attenuator project
* [[ADF435x PIC]] - PIC controllers for Chinese ADF4350/4351 boards
* [[DigiTwist]] - an experimental 2 axis satellite tracker

== Useful Circuits and notes ==
* [[Antennae changeover relays]] - Notes on suitable antennae 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
* [[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 manuals ==
For HP and Agilent equipment see the [https://groups.yahoo.com/neo/groups/hp_agilent_equipment/info Yahoo group]

== Other equipment information related to ATV ==

UK ATV DX Records

2019-01-09T10:11:27Z

GI7UGV: /* 146MHz */ adding 146 entry from orphaned wiki datv record page

This is a record of the UK DX records for each band. As well as the current record, it lists some previous records.

They are not complete and are based on trawling the forum activity pages and recent contest results - please update or let us know if you know better.

Note, these are UK records only (at least one of the stations involved was located in the UK) and only lists significant one way contacts.

World records are claimed based on the W6HHC list.

==World DATV records==

Ken W6HHC, maintains the record of the world DATV records here: http://w6ze.org/DATV/Known-DATV-DX-Records_2018.pdf

Please send Ken an e-mail if you know of a DATV QSO that should be added to this list! (via W6HHC@ARRL.net)

==50MHz==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!! Comments
|-
| 10-12-2014|| 4.5 kms || M0SKM || IO91RV || G4CPE || IO91SW ||543Ks||
|-
| 08-11-2018|| 7.5 kms|| G8GTZ/P|| IO91KD - Wield || G8LES || IO91LC ||333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=5719 Forum report]
|-
| 26-12-2018|| 228 kms || G4FRE || IO82UC - Malvern || G0FRE/P || JO01JK - Isle of Sheppey ||250Ks||One way only [https://forum.batc.org.uk/viewtopic.php?f=76&t=5794]
|}

==71MHz==
UK only
{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode !!Comments
|-
| 25-07-2018 || 59 kms || G8VPG/P|| IO81LS - Blorenge || G4BVK/P || IO81TK - Togg Hill||333Ks||[https://forum.batc.org.uk/viewtopic.php?f=75&t=5566 Forum report]
|-
| 14-09-2018|| 136 kms|| G8VPG/P|| IO81FE - Dunkery Beacon || G8BVK/P|| IO81XW - Cleeve common ||333Ks||[https://forum.batc.org.uk/viewtopic.php?f=75&t=5628 Forum report]
|-
| 09-12-2018|| 160 Kms|| G8GTZ/P|| IO80WX - Win Green || G4FRE/P|| IO82QJ - Clee Hill|| 125Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=5764&p=17639#p17639 Forum Report]
|-
| 27-12-2018|| 230 kms || G4FRE || IO82UC - Malvern || G0FRE/P || JO01KK - Isle of Sheppey ||250Ks||One way only [https://forum.batc.org.uk/viewtopic.php?f=76&t=5795]
|}

==146MHz==
UK only band released for amateur use on October 10th 2014
{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| 30-12-2014 || 3.6 kms || G4CPE || IO91SW || G0WFT || || 333Ks||First One way
|-
| 11-01-2015 || 28 kms || G0LPS || IO94EQ || M0DTS || || 333Ks||First 2 way QSO
|-
| 21-02-2015 || 50 kms || G0LPS || IO94EQ || M0DTS/P || || 333Ks||
|-
| 13-06-2015 || 95 kms || G8GTZ/P || IO91GI - Walbury Hill || G4CPE || IO91SW || 333Ks||
|-
| 13-06-2015 || 115 kms || G0LPS || IO94EQ || M0DTS/P || || 333Ks||
|-
| 11-06-2016 || 121 kms || G8VPG/P || IO81LS - Blorenge || G8GKQ/P || Walbury - IO91GI || 333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=4519&start=20#p10748 Report]

|-
| 03-09-2016 || 169 kms || G8VPG/P|| IO80WX - Win Green || G8GTZ/P || IO82QL - Brown Clee || 333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=4684&start=20 Report]
|-
| 03-09-2016 || 182 kms || G8GTZ/P|| IO82QL - Brown Clee || G8GKQ/P || IO80UU - Bulbarrow || 333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=4684&start=10#p11046 Report]
|-
| 11-12-2016 || 185 kms || G8GTZ/P || IO90JO - Ventnor|| G8VPG/P || IO81LS - Boringe || 333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=4759&start=20#p11437 Report]
|-
| 29-12-2016 || 277 kms || G8GTZ || IO91KF || G0MJW || IO83RO || 333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=4775&start=10 Report]
|-
| 30-12-2016 || 294 kms || G8LES || IO91LC || G0MJW || IO83RO || 333Ks||
|-
| 14-07-2018 || 313 kms || GI7UGV/P || IO74AU || G4CBW || IO83UB || 333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=5453 Report]
|-
| 24-10-2018 || 407 kms || M0DTS/P || IO94MJ || G4UVZ || IO80KX || 333Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=5693&start=10 Report]
|-
|}

==70cms==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| 24-09- 2013 || 696 kms || G8GTZ || IO91KH || F1FY || JN16VB || DATV ||2 way QSO over 24 hour period! '''World record'''
|}

==23cms==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| October 2010 || 440 kms || G4KLB || Bournemouth || M0DTS || Yarm || DATV|| '''World Record'''
|}

==13cms==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| 9 June 2018 || 85 km || G8GTZ/P || IO90LX Wether Down || G8GKQ/P || IO80WP Lulworth || 1 MS DATV ||
|}

==9cms (3.4GHz)==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| 09-06-2017 || 51 kms|| G1LPS || IO94EQ || M0DTS/P || IO94DF - Masham || DATV||
|-
| 10-06-2018 || 154 kms|| GW4CBW/P || IO83FD - Blychau || G3NWR/P || IO84ML - Kirkstone || DATV||
|}

==6cms (5.6GHz)==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| 09-06-2017 || 80 kms || G8GTZ/P|| IO80WP - Povingdon Hill || G8GKQ/P || IO90LU - Portsdown Hill || ATV ||
|-
| July 2017 || 88 kms || G8GTZ/P|| IO90LX - Wether Down || G8GKQ/P || IO80WP - Povingdon Hill || ATV ||
|-
| 29-08-2017 || 138 kms || G8GTZ/P|| IO81FE - Dunkery Beacon || G8GKQ/P || IO81XW - Cleeve common || ATV|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=5127#p13573 Report]
|-
| April 2018 || 153 kms|| GW3NWR/P|| IO83FD - Blychau || M0KPW/G0HIK/P || IO84ML - Kirkstone || ATV ||
|-
| 09-05-2018 || 158 kms || G4NJJ/P || JO02OW - East Runton || G8AGN / G0RPH/P || IO94VB - Bridlington || ATV || [https://forum.batc.org.uk/viewtopic.php?f=75&t=5468 Report]
|-
| 29-06-2018 || 159 kms || GI7UGV || IO74DN - Scrabo || G0HIK / M0KPW/P || IO84IH - Corney|| ATV ||[https://forum.batc.org.uk/viewtopic.php?f=75&t=5538 Report]
|-
| 05-07-2018 || 180 kms || GI0GDP/P || IO74AU - Larne || G0HIK / M0KPW/P || IO84IH - Corney || ATV ||[https://forum.batc.org.uk/viewtopic.php?f=75&t=5545 Report]
|-
| 25-10-2018 || 190 kms|| G8GTZ/P || IO81XW - Cleeve Common || G3NWR/P || IO83RO- Winter Hill || ATV||[https://forum.batc.org.uk/viewtopic.php?f=75&t=5693&start=10 Report]
|-
| 25-10-2018 || 370 kms || G8VPG/P || IO81QF - Mendips || M0DTS/P || IO94MJ - NY Moors || ATV ||[https://forum.batc.org.uk/viewtopic.php?f=75&t=5693&start=10 Report] - '''World record'''
|}

==3cms (10GHz)==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| 03-07-2016 || 93 kms || G8GTZ/P|| IO91GI - Walbury || G8GKQ/P || IO80WP - Povingdon || 333 Ks||
|-
| 27-08-2017 || 136 kms || G8GTZ/P|| IO81FE - Dunkery Beacon|| G8GKQ/P || IO81XW - Cleeve Common || 333 Ks|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=5127#p13573 Forum] ||
|-
| 25-10-2018 || 407 kms || M0DTS/P || IO94MJ - NY Moors || G4UVZ || IO80KX || 2Ms DATV|| [https://forum.batc.org.uk/viewtopic.php?f=75&t=5693&start=10 Forum report]
|-
|}

==24GHz==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| 11-06-2017 || 51 kms|| G1LPS || IO94EQ || M0DTS/P || IO94DF - Masham || DATV||
|-
| 10-06-2018 || 85 kms|| G8GTZ/P || IO90LX - Wether Down || G8GKQ/P || IO80WP - Povingdon Hill || DATV||
|}

==47GHz==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!!Comments
|-
| December 2017 || 30 km|| G4FRE ||IO82UC - Malvern || G4FRE/P || IO92BA - Broadway || 1 Ms/s || One way only - [https://forum.batc.org.uk/viewtopic.php?f=75&t=5321 Forum report]
|}

==76GHz==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Mode!! Comments
|-
| 09-06-2018 || 12 kms || G8GTZ/P || IO90LX - Wether Down || G4LDR/P || IO90LU - Portsdown Hill || 250Ks RB-TV|| '''World record'''
|}

==134GHz==

{| class="wikitable"
|-
! Date !! Distance !! Station 1 !! Location !! Station 2 !! Location !! Comments
|-
| Example || || || || || ||
|}

Reduced bandwidth TV

2019-01-09T09:59:32Z

GI7UGV: broken link, not needed anyway as displayed above

= A good introduction =
<pdf>File:rbtv.pdf</pdf>

UK ATV repeaters

2019-01-09T09:49:18Z

GI7UGV:

There are over 30 active ATV repeaters in the UK and the current status and operating frequencies can be found on the [https://www.ukrepeater.net/repeaterlist5.htm RSGB ETCC TV list]

You can watch most UK ATV repeaters on the [http://www.batc.tv/ch_live.php BATC video streaming service.]

[[File:tvrepeaters.JPG|400px]]

To add your repeater to this page, simply add a description, preferably in alphabetic order.
=== GB3AT ===
GB3AT is the new 10 GHz TV repeater project on the Isle of Wight at IO90IR.

Currently testing as G8MBU's personal beacon

Output (analogue): 10235 MHz FM ATV

=== GB3ET ===
GB3ET is the proposed new 23cms ATV repeater at Edgehill approximately 6 Miles NW of Banbury.

=== GB3FT ===
GB3FT is the new 23cms TV repeater for Blackpool and surrounding area.

=== GB3HV ===
GB3HV is the 3.4 GHz output repeater located near Farnham in Surrey.
For more details visit our [http://www.gb3hv.com/ website].

=== GB3JT ===
GB3JT is the new 23cms TV repeater for Hastings and surrounding area. 
Output (digital): 1318 MHz DVB-S, 4 MSymbols, 1/2 FEC. (24/7 TX Video Test Card during Testing) 
Input (analogue): 1249 MHz (Under Development. Future RX) 
Input (digital): 1249 MHz DVB-S, 4 Msymbols, auto FEC, PIDs auto detected (Under Development. Future RX) 
Input (digital): 437 MHz DVB-S, 2 Msymbols, auto FEC, PIDs auto detected (Under Development. Future RX with added cavities due to other co-located 70cm repeaters) 

The repeater antenna is an Angled Slot, mounted on top of the GB3HE four stack, which is on top of the main mast located ~ 500 feet ASL on the Ark Helenswood in Hastings TN34 2AF. 

Talkback audio channel is currently taken directly from GB3HE, with future 2M RX to be added. DATV/ATV audio will be auto switching on second channel. 

For more details please visit [http://www.rilges.org.uk RILGES Repeater Group]. 

===GB3KM===
Located in Kirk Merrington, County Durham, IO94EQ - 200mAsl. 
Analogue Inputs: 1.280GHz, 2.328GHz, 5.665GHz (6.5MHz Audio), 10.315GHz. 
Digital Input: 1.280GHz - 4Ms, MPEG-2 FEC:Auto PMT:4095 V:256 A:257. 
 
Primary Digital Output: 3.406GHz 2Ms, MPEG-2 FEC:7/8 PMT:4095 V:256 A:257. 
Secondary Analogue Outputs: 2.440GHz, 10.065GHz. 
 
Live video is streamed from 9cm output by M0DTS - 28km from the repeater using an indoor antenna. 
144.750 audio currently off. 
Operating hours 11:30-23:30. 

=== GB3NV ===
GB3NV is the 9cm TV repeater for central Norwich. 
Output (digital): 3406 MHz sr2000 ks/s 
Input (digital): 437 MHz sr2000 ks/s PIDs auto detected by rx 
Full details here: https://forum.batc.org.uk/viewtopic.php?f=95&t=4726&p=11191

=== GB3TM ===
GB3TM is the 23cm TV repeater for the Isle of Anglesey and North Wales coastal areas. 
Output (digital): 1316 MHz sr4700 ks/s 
Input (analogue): 1249 MHz 
Input (digital): 437 MHz sr2000 ks/s PIDs auto detected by rx 
For more details please visit [http://www.arfon.info Arfon Repeater Group]. 

=== GB3TN ===
GB3TN is the 23cm TV repeater located in central Norfolk. 
Output (analogue): 1316 MHz 
Input (analogue): 1249 MHz 
Input (digital): 437 MHz sr2000 ks/s PIDs auto detected by rx 

===GB3UD===
GB3UD is an ATV repeater situated at Mow Cop, Staffordshire IO83VC. 
Output Digital @ 1318.5 Mhz @4MS/s VID 162 - PMT 32 - AUDIO 88 - FEC 1/2. 
Input (Analogue and Digital) 1249 MHz. 
NOTE OUTPUT IS DIGITAL ONLY REGARDLESS OF ANALOGUE OR DIGITAL INPUT USED. 

=== GB3UT ===
Bath University
Analogue Input frequency = 1249.0MHz Analogue Output frequency = 1311.5MHz
Digital input also available on 1249.00MHz @ 4MS/s with a fec of 3/4

=== GB3YT ===
GB3YT is the 23cm TV Repeater located in Mirfield, West Yorkshire. 
23cm Digital input frequency = 1276MHz (QPSK): SR = 4Ms/s : FEC = 1,2 
70cm Digital input frequency = 437Mhz : SR = 2Ms/s : FEC = 1,2 
Analogue input frequency = 1276MHz (FM) : Audio 6MHz 
Digital only output = 1316MHz : SR = 4Ms/s 
Talkback on 2m = 144.750MHz (CTCSS 118.8Hz) 
During QSO, Main audio on Left channel, 2m talkback on Right audio channel. 
Full details and latest news at [http://www.gb3yt.co.uk GB3YT Website] 

=== GB3ZZ ===
Filton, north Bristol.
Transmits digital ATV on 1316MHz and accepts DATV or FM input on 1249MHz and DATV input on 437MHz.

Portsdown community

2019-01-09T09:48:02Z

GI7UGV:

We'd like to think that the Portsdown users are a friendly bunch and so this page is dedicated to the Portsdown community!

===Need help getting your Portsdown going?===

If you have a problem, the first place to look is [[Portsdown Transmitter User guide|the user manual]] and [[Portsdown transmitter FAQ|the FAQ]].

If you can't find the answer there, head over to the [https://forum.batc.org.uk/viewforum.php?f=103 Portsdown pages on the BATC member's forum].

Or come along to one of our Portsdown clinics at a rally - see below.

===Social Media===

The [https://forum.batc.org.uk/viewforum.php?f=103 Portsdown pages on the BATC member's forum] are the primary source of information and monitored by the core development team.

There is also a Portsdown builders Facebook page https://www.facebook.com/groups/120292178611451/ where fellow builders exchange ideas and post success stories but this is not monitored regularly by the core team and if you have a technical question the best place to get answers is on the BATC forum.

===You are not alone===

And if you want to know if there's someone local to you who may be able to help or even be able to work over the air, [https://drive.google.com/open?id=16rtNSaJLvCfc4wsbJ9p3M6pkua4&usp=sharing take a look at the Portsdown users map] -

It is a public map and does not contain any personal details but if you would like us to add your call sign, a more accurate location or other details just let us know and we'll update it.

===Portsdown contest awards===

For ATVers the most important on-air event of the year is the annual IARU ATV Contest which takes place over the second weekend in June. In 2018 the BATC will again be awarding certificates for the Best DX using a Portsdown Transmitter, and the best Portsdown to Portsdown Contact. So get that system built and on the air!

===Portsdown clinics and demos===
BATC will be attending the following rallies with a Portsdown demo, the member's shop and a fully equipped clinic - if you're having problems or just want to see how yours looks on the spectrum analyser bring it along!

If you can help and support BATC at these rallies let us know - and if there are other events you would like to do on our behalf, let us know.

[[File:BATC rally.JPG|400px]]

5 NOVEMBER 2017

West London Radio and Electronics Fair - Kempton Park.

===The Portsdown Team===

{| class="wikitable"
|-
! Name !! Callsign !! Role
|-
| Evariste || F5OEO || Original Idea and Software
|-
| John O'Loughlin || - || Circuit and PCB Design
|-
| Colin || G4KLB || R & D and Prototypes
|-
| Noel || G8GTZ || Project Definition and Shop
|-
| Dave || G8GKQ || Integration and Further Development of Software
|-
| John || G7JTT || Testing for Software and Shop Hardware
|-
| Phil || M0DNY || Shut-down Button software and advice
|-
| Chris || MW0LLK || DATV Express and IPTS Integration
|-
| Charles || G4GUO || DATV Express Capability
|-
| Heather || M0HMO || RTL-TCP Capability
|-
| Pascal || F4DAV || LeanDVB Signal Monitor
|}

==== Capability Testers ====

There are a number of hardware capabilities in use that are not owned by the core team. The following users help by testing each new candidate release on their custom hardware before each release.

{| class="wikitable"
|-
! Capability !! Name !! Callsign
|-
| Element 14 DSI-connected 7 inch touchscreen || Bevan || VK5BD
|-
| DTX-1 || Martin|| G8LCE
|}

RpiDATV

2019-01-09T09:46:32Z

GI7UGV:

= RpiDATV =
[[File:bplus-300x202.jpg|400px]]

RpiDATV is a software running on [https://www.raspberrypi.org/ raspberry pi] micro computer written by Evariste F5OEO ([mailto:evaristec@gmail.com mail] [https://twitter.com/F5OEOEvariste twitter]).
It encodes video and compute the QPSK baseband modulation.
== History and updates ==
Latest version is now hosted on [https://github.com/F5OEO/rpidatv github]. All instructions to build is there.
Before that, complete SD image could be downloaded but size of download files is huge (1.2GBytes). Updates of image are also hard to maintain.
In future, only some released versions could be built based on github sources.

First documentation [[UglyDATV01]] is '''obsolete'''

You can look at [[HamRadio Presentation]] made at HamRadio 2015.

== Main output modes of operation ==
=== RF output (formaly named Ugly mode) ===
RF could be transmitted without any other hardware through a pin of the Raspberry pi header. It is mainly a test mode as QPSK spectrum is not filtered. By using harmonics it could be received directly by a set top box on L band.
=== IQ ===
I/Q modulation is provided out of 2 pins of the GPIO header.
Hardware I/Q modulator is needed : [[RBTVMOD]], [http://www.g8ajn.tv/dlindex.html DigiLite],
[https://forum.batc.org.uk/viewtopic.php?f=97&t=4145&sid=64b441d2c41529ad302e6287ca7684fc DigiThin] , [http://jf.fourcadier.pagesperso-orange.fr/television/exciter/exciter_e.htm F4DAY], [http://acauquelin.free.fr/site_f1fau/usb_fifo_qpsk.html F1FAU] , [http://f4agc.free.fr/ F1DOJ], [http://f6kbf.free.fr/pdf/RpiDATV%20IQ%20avec%20Modulateur%20DMD-2401.pdf old broadcast modulators].

=== DATV Express ===
Send IP Transport stream to [https://datv-express.com/ datv express] : Datv Express Server (G4GUO).

=== Parallel TS ===
This output the transport stream to an external modulator. Using this method, it is possible to upgrade an all-in-one encoder/modulator from MPEG-2 to H264.
* DTX1 with dock PCB [https://forum.batc.org.uk/download/file.php?id=367 picture]
* SR-SYSTEM Minimod

== Native interfaces ==
rpidatv could be configured through several ways
* Command line
* Menu on console (from local keyboard/screen or via network)
* Graphical menu with a touchscreen : [https://www.youtube.com/watch?v=vo77Jy-_xOs video demonstration]

== External interfaces ==
* Audio/Video are sent from an external PC running VMix software : [http://f6kbf.free.fr/html/Vmix2Rpi/Vmix2Rpi.htm Vmix2Rpi]

== Credits ==
Brian G4EWJ : baseband DVB process for ARM cpu

INSPIRED BY THE IMPLEMENTATION OF PIFMDMA by Richard Hirst <richardghirst@gmail.com> December 2012

[[TestPage]]

BATC Wiki

2018-07-20T00:28:08Z

GI7UGV:

'''Welcome to the British Amateur Television Club Wiki''' - the place to find information on on all Amateur Television related equipment and projects.

''This is a reference library - please use the [https://forum.batc.org.uk/ BATC forum] for discussion on these or any other items.''

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 please observe any copyright restrictions on your material you use. However, before you can add or edit content you will need to [[Registering|register for an account]].

== Contents ==
* [[Registering]] on the BATC wiki
=== New to Amateur TV? ===
* Glossary and index of terms and TLAs used in Amateur Television [[Glossary of terms|Glossary of terms]]
* Get the basics in our collection of [[Getting Started|Getting Started guides]]

=== BATC Information and services===
* The [[new BATC website]]
* [[Joining the BATC]]
* [[Renewing your membership]]
* The [[BATC Privacy statement and data protection policy]]
* The original [[BATC.TV video streaming service]] - pre May 2018
* The [[BATC video archive]]
* The [[BATC forum]]
* The [[BATC shop]]
* The [[WordPress Streaming Parameters]]

=== CQ-TV Magazine ===
* [[Index of articles]]
* [[Archive edition|Archive editions]] download
* [[Project software]] download

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

=== BATC Conventions ===
* [https://forum.batc.org.uk/viewforum.php?f=115 CAT 18] Information about CAT 18 to be held on 15/16 September 2018.
* [[CAT 17]] Antenna test range results, presentations and links to the videos from the 2017 convention.
* [[Presentations from CAT 16|CAT 16]] Presentations and links to the videos from the 2016 convention.
* Video Recordings from previous ATV Conventions can be found on the [https://www.youtube.com/channel/UCUWLnUZllytlcCFd93tnBzw BATC YouTube Channel].

===International Events===

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

=== Getting on the air with ATV ===
The ATV bands:
* [[71 MHz]]
* [[146 MHz RB-TV]]
* [[70cms Analogue TV]]
* [[70cms DATV]]
* [[23cms Analogue TV]]
* [[23cms DATV]]
* [[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)

=== Operating ===
* [[ATV standards]] - a list of standards used by ATV operators including FM bandwidths, DATV PIDs, symbol rates and FEC
* [[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]]
* [[Known DATV DX Records]] - a list of Known DX Records for Digital-ATV (last revised 2017-09-10)
* [[IARU ATV contest]] - How to enter the annual international TV contest

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

* [[Technical topics for ATV repeater builders]]

=== ATV construction projects ===
* [[The Portsdown Transmitter]] - the BATC's Raspberry Pi-based DATV Transmitter
* [[MiniTioune]] - the DATV USB receiver project
* [[Receiver upconverters]] - Details of upconverters to receive 146 and 437 MHz on STB and MiniTioune
* [[Digilite]] - The original home build DATV construction project
* [[DigiThin]] - plug in QPSK modulator module for Rpi
* [[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
* [[RPi Test Card]] - Raspberry Pi based Animated Test Card Generator
* [[PE4302]] - PE4302 variable attenuator project
* [[ADF435x PIC]] - PIC controllers for Chinese ADF4350/4351 boards
* [[DigiTwist]] - an experimental 2 axis satellite tracker

=== Useful Circuits and notes ===
* [[Antennae changeover relays]] - Notes on suitable antennae 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 power 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
* [[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

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

=== Test equipment manuals ===
For HP and Agilent equipment see the [https://groups.yahoo.com/neo/groups/hp_agilent_equipment/info Yahoo group]

=== Other equipment information related to ATV ===

BATC Wiki

2018-07-20T00:27:52Z

GI7UGV: Update a forum link to the new site.

'''Welcome to the British Amateur Television Club Wiki''' - the place to find information on on all Amateur Television related equipment and projects.

''This is a reference library - please use the [http://forum.batc.org.uk/ BATC forum] for discussion on these or any other items.''

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 please observe any copyright restrictions on your material you use. However, before you can add or edit content you will need to [[Registering|register for an account]].

== Contents ==
* [[Registering]] on the BATC wiki
=== New to Amateur TV? ===
* Glossary and index of terms and TLAs used in Amateur Television [[Glossary of terms|Glossary of terms]]
* Get the basics in our collection of [[Getting Started|Getting Started guides]]

=== BATC Information and services===
* The [[new BATC website]]
* [[Joining the BATC]]
* [[Renewing your membership]]
* The [[BATC Privacy statement and data protection policy]]
* The original [[BATC.TV video streaming service]] - pre May 2018
* The [[BATC video archive]]
* The [[BATC forum]]
* The [[BATC shop]]
* The [[WordPress Streaming Parameters]]

=== CQ-TV Magazine ===
* [[Index of articles]]
* [[Archive edition|Archive editions]] download
* [[Project software]] download

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

=== BATC Conventions ===
* [https://forum.batc.org.uk/viewforum.php?f=115 CAT 18] Information about CAT 18 to be held on 15/16 September 2018.
* [[CAT 17]] Antenna test range results, presentations and links to the videos from the 2017 convention.
* [[Presentations from CAT 16|CAT 16]] Presentations and links to the videos from the 2016 convention.
* Video Recordings from previous ATV Conventions can be found on the [https://www.youtube.com/channel/UCUWLnUZllytlcCFd93tnBzw BATC YouTube Channel].

===International Events===

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

=== Getting on the air with ATV ===
The ATV bands:
* [[71 MHz]]
* [[146 MHz RB-TV]]
* [[70cms Analogue TV]]
* [[70cms DATV]]
* [[23cms Analogue TV]]
* [[23cms DATV]]
* [[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)

=== Operating ===
* [[ATV standards]] - a list of standards used by ATV operators including FM bandwidths, DATV PIDs, symbol rates and FEC
* [[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]]
* [[Known DATV DX Records]] - a list of Known DX Records for Digital-ATV (last revised 2017-09-10)
* [[IARU ATV contest]] - How to enter the annual international TV contest

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

* [[Technical topics for ATV repeater builders]]

=== ATV construction projects ===
* [[The Portsdown Transmitter]] - the BATC's Raspberry Pi-based DATV Transmitter
* [[MiniTioune]] - the DATV USB receiver project
* [[Receiver upconverters]] - Details of upconverters to receive 146 and 437 MHz on STB and MiniTioune
* [[Digilite]] - The original home build DATV construction project
* [[DigiThin]] - plug in QPSK modulator module for Rpi
* [[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
* [[RPi Test Card]] - Raspberry Pi based Animated Test Card Generator
* [[PE4302]] - PE4302 variable attenuator project
* [[ADF435x PIC]] - PIC controllers for Chinese ADF4350/4351 boards
* [[DigiTwist]] - an experimental 2 axis satellite tracker

=== Useful Circuits and notes ===
* [[Antennae changeover relays]] - Notes on suitable antennae 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 power 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
* [[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

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

=== Test equipment manuals ===
For HP and Agilent equipment see the [https://groups.yahoo.com/neo/groups/hp_agilent_equipment/info Yahoo group]

=== Other equipment information related to ATV ===

Getting Started

2018-07-20T00:27:11Z

GI7UGV:

Amateur Television is a fascinating area of Amateur Radio covering all aspects of video production, editing, transmission and reception of Television and has always been at the fore front of the technology revolution. Many stations are now transmitting Digital pictures (DATV) using the DVB broadcast standards and using video streaming technologies to exchange pictures with ATV operators around the world.

You're probably here because you want to know more about Amateur Television and so help you get to grips with the basics of our hobby, BATC has put together a series of "Getting started" guides.

Once you've read those, you may be wondering if there's an easy way to "get on the air" - if so take a [[5.6 GHz|look at this page]] which shows you how to join in the fun on 5.6GHz ATV for under £20! Or if you are wondering what what DATV equipment you need to buy, so we have put together a [[DATV Equipment Shopping List|DATV shopping list]] to help you decide how to spend your hard earned cash!

===Getting started - the basics===

A good place to start is by reading the [[Media:GSATV2016.pdf|Getting Started in ATV leaflet]] also available as an [[Media:Getting started with ATV.pdf|article extract]] from CQ-TV, our quarterly newsletter:

Or take a look at this [[Media:Getting started Feb 2018.pdf|introduction to ATV PowerPoint presentation]]

=== Receiving and transmitting ATV ===

To find out more about receiving and transmitting ATV signals download these "Getting started" guides:

[[Media:Getting Started in DATV reception.pdf|DATV Reception]]

DATV transmission - take a look at the [[The Portsdown Transmitter|BATC Portsdown project]], a simple easy way to get on air with Digital Television.

=== Reduced bandwidth TV ===

And to find out more about the latest technology called Reduced Bandwidth Digital television (RBTV) take a look at this [[:media:cqtvrbtv.pdf|RB-TV special edition of CQ-TV]].

For more technical details take a look at our getting started guide to RB-TV.
[[Media:Getting Started with RB-TV.pdf|Getting Started with RB-TV]]

=== Video signal basics ===

If you want to know more about the basics of video signals, Brian Summers has written a series of articles for CQ-TV which are available for downloads as part of our "getting started" series.

Part 1-7 available as a single download:
[[Media:Video Fundamentals 1-7.pdf|Video Fundamentals parts 1-7]]

===What next?===

Having read and digested all the information in these getting started guides and want to get on air, the next thing to look at is the BATC [[The Portsdown Transmitter|Portsdown DATV transmitter]] project. There's probably someone building one near you - you can check by looking at the [https://www.google.com/maps/d/u/0/edit?mid=16rtNSaJLvCfc4wsbJ9p3M6pkua4&ll=2.068709435595707%2C0&z=2 Portsdown users map].

And for a receiver take a look at the [[MiniTioune|Minitioune]] project.

Or if you want to get on to ATV the really easy way and for very little cost - take a look at [[5.6 GHz|this page on using the 5.6GHz Drone FPV transmitters]]!

And then head over to the [https://forum.batc.org.uk/ BATC members forum] to gain even more knowledge and ask those questions you must have - and don't worry the ATV community are a friendly bunch!

Or take a look to see if there's a TV repeater near you on [[UK ATV repeaters|this wiki page.]]

Portsdown transmitter FAQ

2018-07-20T00:25:09Z

GI7UGV:

* '''I've just changed my Callsign and now nothing works'''
If you have entered text with spaces in the callsign field, the software will crash (I've tried to cure this, but it's a very difficult problem). The cure is to open an SSH session (using Putty or Kitty), exit to the command line, and then do a factory reset by entering:

cp -f /home/pi/rpidatv/scripts/configs/portsdown_config.txt.factory /home/pi/rpidatv/scripts/portsdown_config.txt

If your software has not been updated since 1 February 2018, then the line that you should enter is:

cp -f /home/pi/rpidatv/scripts/configs/rpidatvconfig.txt.factory /home/pi/rpidatv/scripts/rpidatvconfig.txt

Afterwards, restart the console menu with the command:

/home/pi/rpidatv/scripts/menu.sh menu

* '''How do I prevent regular clicks/thumps on Streamed audio?'''
Check the following: 1. A valid video signal must be present at the input to the EasyCap before you turn the streaming on. 2. The supply voltage, measured on the GPIO pins, should be between 5.0 and 5.1 volts during streaming. 3. The EasyCap should be plugged directly into the RPi or connected by a short, good quality, USB lead.

* '''How do I reduce the background noise/hum on Streamed audio?'''
The poor quality USB leads supplied with the EasyCaps should not be used. The EasyCap should be plugged directly into the RPi or connected by a short, good quality, USB lead.

* '''Why do I get occasional dropouts of the received or streamed picture at 16:9 or 720p?'''
The Raspberry Pi 3 is working at its processing limit at these higher resolutions and occasionally runs out of resources. 16:9 is particularly bad because it is generated by down-scaling 720p, or stretching SD.

* '''Can I use the new Raspberry Pi 3+?'''
Yes. The "Portsdown Stretch" software build works on a Raspberry Pi 3+ or a Raspberry Pi 3. Details here: https://github.com/BritishAmateurTelevisionClub/portsdown . The original "Jessie build does not work on the new Raspberry Pi 3+.

* '''How do I turn the transmitter off in Touchscreen mode?'''
In transmit, the touchscreen is used to monitor outgoing video and so the buttons are no longer visible - to turn the transmitter off, simply touch the screen in the same area as the TX button.

* '''What do I need to receive a Portsdown transmitter?'''
When a Portsdown transmitter is fitted with a filter / modulator card and running in normal bandwidth modes (above 1 Msymbol/sec) you will be able receive it on any Free to Air (or FreeSat but not Sky or Freeview) satellite Set top box - if you have a High Definition STB you will be able to receive MPEG-2 and MPEG-4.

However, when it is running in RB-TV modes OR in Ugly mode without the Filter Modulator card, you can only receive it using the MiniTiouner USB receiver. This is a BATC supported project with some home construction needed - the hardware components are available from [https://batc.org.uk/shop/minitiouner the BATC shop] and the software is a free download from F6DZP [[MiniTioune|see here for more details]].

*'''Can I use another touchscreen LCD?'''
The Portsdown project only supports the Waveshare screen - that doesn't mean to say others won't work but we can't help you if it doesn't. The Element 14 7 inch touchscreen is the only recommended alternative. HDMI-connected touchscreens are not suitable.

*'''Can I use a Raspberry Pi 2?'''
You can try it, but some capabilities will not work. For example, the RPi 2 does not seem to be capable of handling analogue capture properly and puts streaks across the picture. The Pi Camera is less demanding and has been demonstrated to work with an RPi 2 in some circumstances. The project team will not support the RPi 2 - please just buy an RPi 3.

*'''Who are the Portsdown team?'''
The Portsdown team are just BATC members doing this as volunteers to support the ATV community. As such, it is not their full time job and they are not being paid. If you have a problem, question or comment, please do not contact them directly but use the [https://forum.batc.org.uk/viewforum.php?f=103 BATC members forum] but there may not always be an instant response!

And yes we are looking for people to help with the project - if you can write Linux, update Wiki pages or reply to forum posts we want to hear from you!

*'''Do I need to know about Linux or other clever computer stuff to get Portsdown running?'''
NO - the Portsdown transmitter has been designed to "work out of the box":
*You do not need to do anything other than follow the [[Initial setup|initial set up guide]]
*Do not load any device drivers
*Do not tinker with Linux commands
If you do, we don't have time to support you and will just advise you to reformat your SD card and start again!'''

*'''Does Portsdown mean BATC will stop selling the DTX1 like they did DATVexpress?'''
NO - The DTX1 is designed for those who do not want to "build their own" and will still be available in the BATC shop and supported by Antennair through the [http://www.dtx1.info/ DTX1 support website]. DATVexpress is no longer in production - the reason we stopped selling it in the BATC shop is because the DATV Express team wanted to offer it directly to end users.

*'''Is Portsdown MPEG-2 or MPEG-4?'''
Both - The RPi hardware encoder runs MPEG-4 and the Portsdown software has an MPEG-2 encoder both of which are used in the Portsdown transmitter.

* '''Why can't I download or update the software?'''
We have had reports of problems with downloading software and updates from members with Virgin Media and BT internet connections. The work-round for Virgin Media is described on the GitHub page. BT users should make sure that they have "Web Protect" turned off for the download.

* '''When I type my password, the cursor does not move. Is this right?'''

Yes. Passwords typed at the command line in Linux do not cause the cursor to move. You just have to type carefully; if you make a mistake just backspace lots of times and then start the password again.

*'''How do I get out of touch screen back in to console mode?'''

The process is very similar to initial set up and is done by using an external PC with 2 pieces of software - the first application is to find the IP address of your RPi when it first boots up, such as [http://www.advanced-ip-scanner.com/ Advanced IP Scanner] and an SSH Terminal application such as [http://www.chiark.greenend.org.uk/~sgtatham/putty/ Putty].

*Connect the RPi to the same network as your PC, and either check on the touchscreen "info" page (on Menu 3) or use the IP Scanner to find the IP address of your RPi.

*Open Putty and enter the IP address of your RPi and open a connection. At the logon prompt enter the default username of pi and the password given to you with the card.

The console menu should start automatically and the touchscreen will display the BATC logo.

Note, if the console menu does not appear and you end up at the Linux Command Line, you can get back to the Main Console Menu by typing:

/home/pi/rpidatv/scripts/menu.sh menu

*'''When I Log-on or start the Console Menu, it goes Straight to the Exit Screen. How do I recover?'''

If you accidentally enter a space character when entering the frequency or symbol rate, the Menu software fails and tries to exit. You can recover by typing the command:

cp -f /home/pi/rpidatv/scripts/configs/portsdown_config.txt.factory /home/pi/rpidatv/scripts/portsdown_config.txt

at the Linux command line, and then restarting the console menu with the command:

/home/pi/rpidatv/scripts/menu.sh menu

*'''How Can I update my Portsdown Software?'''

As long as you have an internet connection, you can update your Portsdown Software to the latest version from the Console Menu. Full instructions are here: [[Updating your Portsdown Software]]

*'''Where can I get a diagram of all the RPi GPIO pins?'''

The full wiring listing for the RPi GPIO is here

[[PTT and band switching#Summary_of_GPIO_connections]]

*'''The lock LED on the AD4351 board does not come on'''

The lock light only comes on when in Portsdown/IQ mode and you are on Transmit

Assembling Portsdown

2018-07-20T00:23:42Z

GI7UGV: Update a forum link to the new site.

This section will describe in detail how to assemble your Portsdown transmitter - to begin, you need to have bought or built all the components listed in the [[Portsdown hardware|hardware description.]]

This page describes how to build the complete transmitter assembly but you can run the Portsdown as an experiment in [[QPSKRF or Ugly mode|"Ugly Mode"]], currently labelled in the Menu as QPSKRF. That does not require you to wire anything together.

===Mechanical Design===

First of all, decide on your mechanical design. You are going to need to have the RPi firmly mounted, with the Micro-SD card slot accessible (to change the card if required) and the power, network and USB connectors available. Then you will need to stack a GPIO extender on top of the RPi.

The most difficult part will be to mount the Touchscreen display. It can either be stacked on top of the RPi, or you can connect it by a short multiway lead and mount it on the front panel of your housing - an example is here: http://www.ebay.co.uk/itm/141354697688

f you have a 3D printer you could try make up one of these housing http://www.thingiverse.com/thing:1920486

You will then need to consider mounting the ADF4351 Synthesizer, any LO filters and then the Filter/modulator board. Other things to think about might be a 5V power supply, a relay/PTT switching board and any dongles (EasyCap, Sound or RTL-SDR).

The block diagram of what you are trying to achieve is below. Note that you will need an additional filter between the synthesizer and the filter/modulator board for 437 MHz and 146 MHz. It is not required for 1255 MHz, and the unit will work on the other bands for testing without it.

[[File:1-1 Block Diagram.jpg|600px]]

An example layout is here

[[File:In the box.jpg|600px]]

===Interconnecting the modules===

The following diagram shows the interconnects between the various modules - all wire can be non screened (except the Local oscillator feed to the Filter modulator board) but should be kept as short as possible.

[[File:Portsdown interconnects.JPG|600px]]

Higher resolution pdf is available here [[:File:Portsdwon interconnect v2.pdf]]

Or a picture might help...

[[File:assembly.JPG|600px]]

===BATC GPIO breakout card===

The GPIO breakout card is where all the signals and power for Portsdown interconnect and we recommend that you buy the blank PCB from the BATC and make up the breakcard using either connectors or hard wiring to the other boards.
For more details see this [[GPIO breakout|wiki page]]

[[File:screw t.jpg|300px]]

[[Willow components breakout card]] (If you have bought the BATC GPIO breakout card you DO NOT NEED to read this section)

===Powering the ADF4351===

The ADF4351 module needs between 5 and 9 volts on its power connector. You can either buy a suitable (small barrel) connector or solder the wires to the underside of the board. The 5V supply can be taken from the same source as the Raspberry Pi 5.2V supply, or from any other 5V supply. It does not need to be very clean. DO NOT try to put 3.3V into the marked pin on the data connector on the module; this is a low current output, not an input.

===RF Wiring===

Use short flexible SMA cables to connect the ADF4351 (through filters if necessary) to the filter/modulator board. Use another cable to take the output to a panel connector or subsequent filters and power amplifiers.

You may also want to extend the input of any RTL-SDR to be accessible from a panel connector.

===Power Supplies and Wiring===

You should power the RPi through the Micro-USB power connector to take advantage of the input protection provided. Use a very short USB cable to your power supply as most of these cables are of very poor quality and cause significant voltage drop. For best results, cut the USB cable 5cm from the connector and run "real" wiring from there to your power supply.

Do not power unnecessary items from the RPi's 5v outputs on the GPIO connector. Doing so will induce extra voltage drop in the input protection circuitry. Power the VCO filter and RF Switch directly from the switch mode power supply. No problems with ripple have been observed.

A lot of strange problems, such as the Portsdown running very slowly or intermittent/noisy streaming, can be caused by poor PSU volts - the RPi3 is actually specced for 5.1 volts, make sure your PSU delivers enough volts and current. See [https://forum.batc.org.uk/viewtopic.php?t=4856&p=11935#p11935 this post on the BATC forum] for a real user experience!

If you see a "Lightning Flash" symbol at the top right of your LCD display it means that the voltage at the RPi is too low. You can measure the voltage between the GPIO connector pins 4 and 6.

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

You can check if there are any problems by running the command
vcgencmd get_throttled
from the command line. You should get the response "throttled=0x0" which means that all is well. The response "throttled=0x50000" means that the voltage has dropped below the safe level at least once since boot-up; the response "throttled=0x50005" means that the voltage is currently below the safe level. Other responses might mean that your RPi is overheating. The "Info" screen on Menu 3 will also state if there have been any low-voltage events since boot-up.

An eBay buck regulator capable of supplying at least 4A continuous at 5.2V is recommended to power the RPi, an EasyCap, an RTL-SDR and the ADF4351. '''Consumer-grade RPi power supplies with consumer grade USB cables have rarely proved to be capable of supplying this high demand without causing dropouts.'''

The filter/modulator board needs a clean 5V at 250 mA and the on-board linear regulator supplies this, but can get warm at higher input voltages. The linear regulator needs at least 7V to operate properly. Feeding it with 8 volts provides the best compromise between regulator margin and heat dissipation.

You can use a switching or buck converter to supply the filter-modulator board with 5V, but the switching ripple introduces some detectable sidebands on the transmitted signal. These have very little adverse effect, but are visible on a spectrum analyser. On-board switching regulators have been tested, and the pads are there for L10 to provide extra filtering. Again, they introduce low-level sidebands, but these are probably not significant.

===Network and USB Wiring===

Consider bringing the network connector and one of the USB connectors out to the panel for easy access and mechanical stability.

===Camera Wiring===

The RPi camera gives excellent results, but only comes with a short ribbon cable to connect it to the RPi.

It is possible to use some higher quality HDMI leads (the ground connections all need to be made) to extend the camera lead - this does NOT mean the signal out of the camera is HDMI, it is actually "Camera Serial Interface Type 2 (CSI-2)". We are just using HDMI cable as a useful extension lead. The modification described here https://wiki.batc.tv/CSI-2_to_HDMI allows the use of lower quality HDMI cables.

Kits are available to connect a female HDMI connector to the RPi camera connector, and another female to the camera, allowing the use of domestic 1, 2 and 3m HDMI leads. The Pi camera HDMI Lead Extension Kit is available from here https://www.tindie.com/products/freto/pi-camera-hdmi-cable-extension/

===USB Cables===

Use short (shortened?) good quality USB cables to connect the EasyCap and RTL-SDR to the RPi. Use of the poor-quality USB cable supplied with the EasyCap has been shown to cause audio dropouts in a streamed signal.

The Portsdown Transmitter index

2018-07-20T00:22:21Z

GI7UGV: Update forum link to new site.

This page is designed to give an index of the pages relating to the Portsdown transmitter project.

===Overview===

*[[The Portsdown Transmitter]] Introduction

*[[Portsdown Transmitter User guide]]

*[[Portsdown Output Levels]]

*[[Portsdown transmitter FAQ|Frequently asked questions]]

===Hardware Construction Pages===

*[[Filter Modulator ver2|Filter Modulator Version 2]]

*[[GPIO breakout|GPIO Breakout Card]]

*[[LO filters|Local Oscillator Filter]]

*[[PTT and band switching|4-Band Decoder]]

*[[RF output switch|4-Band RF output Switch]]

*[[8-Band Decoder]]

*[[8-Band RF Output Switch]]

===Hardware===

*[[Portsdown hardware|Detailed Hardware Listing]]

*[[Assembling Portsdown|Assembling Portsdown]]

*[[DATV Equipment Shopping List|DATV equipment shopping List including Portsdown Build Options]]

*[[Filter Modulator build|Filter Modulator Board]]

*[[Filter Modulator Version 1A Modifications]]

*[[Portsdown Output Levels|Filter Modulator Version 1A Output Levels]]

*[[LO Filter Performance]]

*[[Output Attenuator]]

*[[Portsdown Displays]] Advice on what display to use with your Portsdown transmitter.

*[[CSI-2_to_HDMI|Using an HDMI Lead for the Pi Camera]]

*[[PTT_and_band_switching#Summary_of_GPIO_connections|Summary of GPIO Connections]]

*[[Analog Video Output]]

*[[Portsdown 2018 Band Switching]]

*[[Webcam Support]]

*[[Powering your Raspberry Pi]]

===Software===

*[[Portsdown software|Software Installation Guide]]

*[[Initial setup|initial set up guide]]

*[[Console mode|A Guide to the Console]]

*[[Setting up the WiFi]]

*[[Updating your Portsdown Software]]

*[[BATC Portsdown Transmitter Support Statement|Portsdown Transmitter Software Support Statement]]

*[[Feeding Video to Portsdown from vMix]]

*[[Audio Switching]]

*[[Software capabilities and issues]]

*[[201707221 Release Note]]

*[[Software Capability Matrix]]

*[[Calibrating the TouchScreen Alignment]]

*[[Test SW Image|SD Card Image download for Software 201801061]]

*[[The "Portsdown 2018" Software]]

*[[Portsdown 2018 Stretch Software]]

*[[Portsdown 2018 "Contest Edition" Software]]

===Specific Capabilities===

*[[Streaming to batc.tv with Raspberry Pi]]

*[[Repeater Streaming|Adjusting the Repeater Stream quality for noisy video]]

*[[Still Capture from Composite Video Input]]

*[[Controlling a DATVExpress]]

*[[Use With a DTX-1]] How to use your Portsdown transmitter to transmit RB-TV with a DTX-1

*[[Hardware-only Transmit Switching]] How to use the Portsdown without a Touchscreen or computer.

*[[Portsdown Signal Generator]]

*[[FreqShow]] Displaying the received frequency spectrum

*[[C920 Webcam|How to Use the C920 Webcam with the Portsdown]]

*[[Lean DVB receiver]]

*[[Webcam Information]]

*[[RX Up-converter LO Capability]]

*[[Streaming Display]]

===More Information===
*[[Display Resolutions|PAL/NTSC and Display Resolutions]]

*[[Video Cameras and Capture Devices]]

*[[Marketing materials| Brochure and presentations]]

For interactive discussion with other constructors see the [https://forum.batc.org.uk/ BATC Members' Forum Pages]
--------------------

MiniTiouner hardware Version 1

2018-07-20T00:21:17Z

GI7UGV: Update forum link to new site/subforum.

The original MiniTiouner hardware launched in 2015 used a PCB designed by Brian G4 EWJ to enable easy home construction of the MiniTiouner hardware and components for over 200 units have been sold around the world.

[[File:IMAG0218.jpg|400px]]

All the project documentation is available for download in the zip file:

[[:File:MTK1 Instructions v1-9, Parts v5, Overlay, Schematic v1.zip]]

Colin G4KLB has done an excellent video on constructing the MiniTiouner: https://www.youtube.com/watch?v=vXUIQPeslwM

The version 1 PCB was designed for use with the Sharp and Edeartek tuner NIMs available from the BATC shop in 2015 and 2016.

===Serit NIM Adapter card===

Due to the Sharp NIM going obsolete, from Jan 2017 the BATC only sells a NIM from Serit. However, as the pinout is different from the Sharp NIM, a simple adapter board is required to enable the Serit NIM to be plugged in to the original MiniTiouner PCB.

[[File:Serit.JPG|400px]]

Brian G4EWJ has designed a PCB and the blank board and the Serit NIM is available [https://batc.org.uk/shop/minituner in the BATC shop].

You only require the adaptor PCB if you are upgrading a MiniTiouner version 1 hardware to use the Serit tuner. Any new constructors should use the version 2 board which will not need the adapter PCB.

The adapter card build instructions, Parts List, Schematic and silkscreen print are in this zip file. NOTE - the kit referred to in the documentation is no longer available:

[[media:Serit_FTS4335V_Converter_Kit_MTK2_Instructions_v1-07_Parts_Build_A1_v1_Schematic_A1_v2_Silkscreen.zip]]

===Compatible NIM types===

Only NIMs ( Network Interface Module) or tuners that have the following STMicroelectronics chips can be used:

*Zero tuner chip can be STB6100, STV6110, STV6111, STV6120
*Demodulator chip STV0903, STV0913, STV0910

The following NIMs can be used:
* Eardatek EDS-4B47FF1B+ (sold by BATC shop during 2015 / 16)
* Sharp F7VZ0169 (sold by BATC shop during 2016)
* Samsung DNBU10711IST
* Samsung DNBU10512IST
* LG TDQX-S001F
* Serit SP2246
* Serit FTS-4335 - Sold by BATC shop in 2017 but with different pin out so needs the adapter card.

Please use the BATC forum for any feedback on this project https://forum.batc.org.uk/viewforum.php?f=105

When you have built your MiniTiouner, you can check it using the software "TestMyMiniTiouner" included in the [[MiniTioune software|Minitioune software package]].

5.6 GHz

2018-07-20T00:18:53Z

GI7UGV:

[[File:5.6 GHz Orientation Small.jpg|300px|center]]
It is very easy (and low cost) to get on the air on 5.6GHz (the 6 cm amateur band), using the cheap modules intended to transmit “First Person Video” (FPV) back from drones to their operators. These units can be used without any modifications to get on air, and with simple WiFi plate or dish antennas (and a clear line of sight path) can be used to send pictures to stations using the same equipment over paths in excess of 50km.

M0KPW has an excellent website describing his 5.6GHz system http://www.5-6ghz-atv.co.uk/

==Frequency choice==

The UK amateur band plan is shown on the RSGB website here: https://thersgb.org/services/bandplans/html/rsgb_band_plan_2017.htm

[[File:bandplan.JPG|800px]]

GB3KM has a licenced input on 5665 MHz and this has been chosen as the primary ATV operating frequency. Audio WB-FM operators have been using 5825 and 5840 MHz. 5825 MHz is too close to the band edge for ATV, and 5840 MHz is marginal.

The FPV equipment receive and transmit frequencies are set using DIP switches, and most tune to 5665 MHz – but care needs to be taken when selecting equipment to make sure it does cover this frequency. Example channel tables are shown at the bottom of this page.

==Equipment==

The FPV units are widely advertised on eBay and other sites with titles similar to “Tarot 5.8G 600MW Telemetry TX/RX Combo for FPV Image Transmission TL300N” and are available at reasonable prices. The typical units are very small but have reasonable FM-TV performance with a quoted transmitter spec of 600mW output and receiver sensitivity of -80dBm. Amplifiers are available to raise the output power to 2 watts or more.

[[File:Tairot 1.jpg|400px]]

Be aware – we have found that on some receiver units, the video output is on the Red phono lead and not the expected Yellow lead!

Some other users' stations are described here [[5.6 GHz Equipment Examples]].

===Improvements to Commercial Units===

In CQ-TV 260, Achille I2GLI described improvements and additions to the Mateksys VTX-HV drone transmitter to make a high quality 18 watt output 5.6 GHz FM transmitter. One of the improvements was to replace the video and sound baseband circuitry. The published circuit diagram in online CQ-TV was a little unclear (although the printed version is good). The circuit diagram is reproduced below.
[[File:BandaBase.jpg|672px]]

===Mounting the equipment===
Due to the very high losses in co-ax cable at 5.6GHz it is recommended that you mount the units very close to the antennas and run long 12V dc, audio and video cables back down to the shack or operating position.

Be aware also, that whilst these units are very small they do run very hot in operation, and it is suggested that you provide a good heatsink for both Tx and Rx – mounting them in a diecast box on the back of their respective antennas is ideal.

[[File:GKQ 5.6v2.JPG|600px]]

Details of G8GKQ's transceiver setup is shown here (receiver unit on left & transmitter with fan on the right)

===Transmit amplifiers===

Whilst the basic units work very well and have been used to transmit over paths of 60km, power amplifiers to boost the 600mW transmitter signal to 2—4 Watts are available from several suppliers on eBay and other sites, and will significantly increase the path length that the units will work over. These amplifiers should be connected after the transmit unit, but before any antenna change over relay(s) – and remember that his will increase the volt drop on any long 12V cable feeding the transmitter at the masthead.

Be warned!! Several users have found these PAs to be "fragile", so you should always make sure that the antenna is connected – and all connectors done up tight – before applying dc or RF power. We are investigating whether they can be made more reliable by reducing the volts / input drive.

[[File:56PA.jpg|200px]]

==Antenna changeover relays==

The FPV equipment comes as separate Tx and Rx units. In order to operate on a single antenna, you will need an antenna changeover relay. Note, however, that the losses at 5.6GHz can be significant and care must be taken when wiring up the units to ensure RF cables are of good quality, and kept to a minimum length – semi-rigid cables fitted with SMA connectors are ideal.

PL259 and even BNC connectors are very lossy at 5.6GHz and should not be used, but the surplus SMA relays often available at rallys are ideal for 5.6 GHz.

See [[Antennae changeover relays|this wiki page]] for more details on suitable relays, 24 volt operation, and 4 port (or transfer) relays.

If no suitable relay is available, it may be cheaper to use separate antennas for receive and transmit as shown in the picture below – note the Tx and Rx units are mounted directly on the back of the flat panel antennas.

[[File:562.jpg|200px]]

===Reverse SMA===

Be aware that all the 5.6GHz FPV units use "reverse SMA" connectors (as used on WiFi equipment) and that all low-loss cables (unless bought specifically for the purpose) and surplus SMA relays will almost certainly have standard SMA connectors – which will not fit. Adapters from reverse to standard SMA are available on eBay or other suppliers – search for "RP-SMA to SMA adaptor" or similar wording.

==Antennas==

As 5.8GHz is used by broadband wireless networks, there is a wide choice of antennas available for use on 5.6GHz ATV. These can range from flat plates/panels to wire mesh (grid) dishes, as seen in the above pictures.

Horizontal polarisation has been chosen as the standard (waveguide feeds needs to have the long dimension of the aperture – and/or horn – vertically oriented when feeding dishes)

=== Satellite dishes ===

It is also possible to use a satellite mini dish with a suitable feed, such as a waveguide/horn to the design by G4NNS – see here for construction details: http://myweb.tiscali.co.uk/g4nns/FeedHorn.html

The picture shows a Sky mini dish fed with a WA5VJB log-periodic PCB feed http://www.wa5vjb.com/products1.html – these are available in the UK from G4DDK. http://www.g4ddk.com/Prices.html

Dishes of this size typically have a beam width of 4—8 degrees.

[[File:56 dish feed.JPG|400px]]

M1BKF found a very interesting 5.6GHz feed for standard f/d ratio satellite dishes; it contains what looks like a PCB yagi, and is available from:

<s>http://www.antennas-amplifiers.com/5.1-5.5-5.8GHz-WLAN-WiFi-Antenna/Feed-Illuminator-satellite-offset-dish-fd-0.5-0.8</s>

https://www.antennas-amplifiers.com/feed-Illuminator-satellite-offset-dish-fd-0.5-0.8

[[File:PCB dish feed.JPG|200px]] [[File:PCB dish feed2.JPG|300px]]

=== DIY BiQuad antennae ===

This web page http://buildyourownantenna.blogspot.co.uk/2014/07/double-biquad-sector-antenna-for-5-ghz-wifi.html has a well engineered double BiQuad antenna with a quoted 13dBi gain.

Note in the picture G8JAN has directly connected the Tx module to the antenna to avoid co-ax losses.

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

==Video equipment - Rx==
The receiver output will need to be directly connected to a monitor with a composite video input to view the received the signal – normally on a yellow phono or RCA connector.

===Video squelch defeat===

Beware of using modern flat-screen monitors which have a video squelch – these will not display noisy signals, and just give a blue screen until they get a strong video signal.

There are a number of circuits around to defeat the squelch and also improve the readability of the signal.

===Syncsmurf by PE1RQM=== – kits are available; details on the [https://translate.google.com/translate?hl=auto&sl=auto&tl=en-US&u=https%3A%2F%2Fwww.pe1rqm.nl%2Fsyncsmurf2%2F webpage here].

[[File:syncsmurf1.jpg|200px]]

Results are very impressive:

[[File:syncsmurf2.jpg|400px]]

===eachine FPV recorder===

Several people have reported that they are using these devices, available from various sites, and as well as defeating the monitor blue screen by inserting syncs on noise they have a single push button record facility. They record to an SD card which can be removed and the files viewed on a PC; users report that you need to use a good quality SD card, and that they have had problems with Kingston branded cards – Sandisk are preferred.

[[File:emachine dvr.JPG|300px]]

===Video sync processor===

[[File:cqtv 129.jpg|300px]]

Or any video sync processor may be usable such as the Advanced Converter Enhancer used by many stations on 23cms FM TV transmissions.

[[File:ACE.jpg|300px]]

==Video equipment - Tx==
An old camcorder with a yellow phono "video out" socket is an ideal video and audio source for the transmitter.

Don't forget that you will need to display your call sign to remain legal. This can be a video generator, a .jpg card reader with video out, or a piece of card with your call sign scribbled on it!

===Media card reader===

A simple way to generate test patterns is to use a media card reader loaded with .jpg files – these are available on several sites, just search for "SD card media AV player" – but make sure you get one which outputs PAL video.

[[File:av player.JPG|200px]]

===PicDream===
The PicDream project uses a single PIC chip and a 4MHz crystal to generate a black and white test pattern – simple but effective – the original project was described in CQ-TV 180 and re-printed in CQ-TV 247.

[[File:Picdream 247.JPG|400px]]

The PIC code is available for download here: batc.org.uk/cq-tv/software/picdream.zip

===Raspberry Pi - PA3CHM image generator===

CQ-TV 247 published details of a simple RPi-based test card generator by Ernest PA3CHM.

[[File:PA3chm.JPG|400px]]

Full details are on his website: http://www.pa3hcm.nl/?p=248

===Raspberry Pi - Portsdown patterns===
The BATC Portsdown project can be configured to deliver composite video and audio out from the RPi multi-jack plug.

[[File:GKQ July 2017 (Small).JPG|400px]]

This can be test patterns, RPi desktop, or the Portsdown camera and microphone – [[Analog Video Output|see this wiki page for more details]] making the RPi the only piece of video/audio equipment you need to drive the 5.6GHz transmitter.

===Stand alone Raspberry Pi animated test card generator===
This is the stand alone version of the animated test card generator that is part of the Portsdown software
[[RPi Test Card| - see this wiki page for more details]]

==On the air==

Using dish aerials of 30—60cm, line of sight ranges of 80km can easily be achieved.

P5 (noise free) FM ATV pictures have been exchanged over a 138km path using the equipment described on this page – the picture below shows G4CPE/P on Dunstable Downs being received at the Ridgeway, near Didcot, over a slightly obstructed 66km path.

[[File:CPE 5.6GHz.JPG|400px]]

Dunkery Beacon near Minehead, to Cleeve Common near Cheltenham.
The picture shows G8GTZ/P received by G8GKQ/P over the 138km path.

[[File:snap5 small.jpg|400px]]

2018-04-21: The UK "record" for a contact using standard FPV units was increased to 153km between GW3NWR/P at Bylchau, North Wales to M0KPW/P and G0HIK/P at the Kirkstone Pass Inn, Cumbria.

This has since been surpassed.

==FM voice only==

Several stations in the Gloucester and Bolton area are using these units for wideband FM voice only. This is achieved by simply putting high level (1V peak-peak) audio on the yellow video TX phono input – this modulates the main high level carrier with audio rather than video (the two audio phono connectors – red and white – can be ignored). On RX, the yellow phono connector of the receiver is simply connected to a line level input of an audio amplifier.

It is done this way because the two audio subcarriers transmitted by the unit are at a level 20dB lower than that of the main (video)carrier. However, as it is using the same bandwidth Rx and Tx system, performance will be no better than FM video – ideally the 480MHz RX IF would be tapped off in to an SDR or narrow band receiver to give significantly enhanced (+20db?) narrow band performance.

==Activity hot spots==

There is a Google map showing approximate locations of stations thought to be active on 5.6GHz FM – if you are on 5.6GHz, you can add or edit your station: https://www.google.com/maps/d/u/0/edit?mid=1e4keFSFWy6wLUQNF3IT3n6h90eU&ll=52.39133141509076%2C-1.8917942000000494&z=7

Known users include:

*Southern England = G8GKQ, G8GTZ, G0UHY, G8XZD, G4UVZ, G3VPF
*Dunstable area = M0SKM, G4CPE, G0WFT
*North-East = GB3KM, G1LPS, M0DTS
*Cheltenham = G0LGS, M0RKX and G4NZV (using WB audio only)
*Bolton Wireless Club = G4JLG, G6GVI, G8PEF, M0UFC, MW1FGQ (PW “Siren” Article)
*Ludlow, Shropshire = G8XYJ
*Yorkshire = G8BYN
*Norfolk = G4NJJ, G8JAN, G4WVU and M1BKF
*Cumbria - Barrow-in-Furness Radio Club project
*Merseyside - G3NWR

[[File:cpe2.jpg|400px]]

==More information==

Dave G8GKQ did a presentation at the BATC annual convention CAT17 in September 2017 on getting started on 5.6GHz ATV.
*The presentation is available here https://wiki.batc.tv/images/4/42/CAT17_5.6_GHzv2.pdf
*The video of the session is available on the BATC YouTube channel here https://www.youtube.com/watch?v=XJzGNsGmE9Y

==On line support / social media==

There is a thread running on the BATC forum where the ATV community are exchanging ideas and also posting results of the latest on air tests. https://forum.batc.org.uk/viewtopic.php?f=2&t=5026

Note that the BATC core team do not regularly visit Facebook pages - time is just too short to monitor everything and it's not easy to follow threads on Facebook.

==Technical information==

===SM201R===
The large RX chip in most units has had the part number removed, however it appears that a lot of receivers use the SM201R module. The spec and pinout are shown below but notice the frequency range of this particular unit does not seem to cover 5665MHz, so make sure the one you buy does!

[[File:sm201r 2.jpg|500px]] [[File:sm201r 3.JPG|200px]]

[[File:sm201r 1.JPG|500px]]

===S meter output===

Looking at the above table, it appears that the RSSI is available on pin 17 of the SM201R and could potentially be used for a signal strength meter to help align the antennas when setting up a QSO.

It also appears that the SM201R uses a 480MHz IF (same as the Comtech) and potentially could be modified with narrower filters to improve RF performance.

====Tx and Rx perfomance====

Initial measurements suggest the TX bandwidth is 25—30MHz.

[[File:5.6GHz spectrum.jpg|500px]]

This accounts for the quoted RX sensitivity at -80dBm which may be improved by an LNA but will ultimately be limited by the RX IF bandwidth.

===Channel Listings===

As mentioned above, the channel settings vary from manufacturer to manufacturer. This table is taken from the Tarot data sheet which uses the SM201R module but does include 5665MHz:

[[File:Tarot_Channels.jpg|603px]]

And this is the table for the Eachine TS835 transmitter:

[[File:Channels_2.jpg|619px]]

This table is from a "Fat Shark" transmitter that does not cover 5665 MHz:

[[File:Fat_Shark.PNG|300px]]

5.6 GHz

2018-07-20T00:18:30Z

GI7UGV: Update forum link to new site.

[[File:5.6 GHz Orientation Small.jpg|300px|center]]
It is very easy (and low cost) to get on the air on 5.6GHz (the 6 cm amateur band), using the cheap modules intended to transmit “First Person Video” (FPV) back from drones to their operators. These units can be used without any modifications to get on air, and with simple WiFi plate or dish antennas (and a clear line of sight path) can be used to send pictures to stations using the same equipment over paths in excess of 50km.

M0KPW has an excellent website describing his 5.6GHz system http://www.5-6ghz-atv.co.uk/

==Frequency choice==

The UK amateur band plan is shown on the RSGB website here: https://thersgb.org/services/bandplans/html/rsgb_band_plan_2017.htm

[[File:bandplan.JPG|800px]]

GB3KM has a licenced input on 5665 MHz and this has been chosen as the primary ATV operating frequency. Audio WB-FM operators have been using 5825 and 5840 MHz. 5825 MHz is too close to the band edge for ATV, and 5840 MHz is marginal.

The FPV equipment receive and transmit frequencies are set using DIP switches, and most tune to 5665 MHz – but care needs to be taken when selecting equipment to make sure it does cover this frequency. Example channel tables are shown at the bottom of this page.

==Equipment==

The FPV units are widely advertised on eBay and other sites with titles similar to “Tarot 5.8G 600MW Telemetry TX/RX Combo for FPV Image Transmission TL300N” and are available at reasonable prices. The typical units are very small but have reasonable FM-TV performance with a quoted transmitter spec of 600mW output and receiver sensitivity of -80dBm. Amplifiers are available to raise the output power to 2 watts or more.

[[File:Tairot 1.jpg|400px]]

Be aware – we have found that on some receiver units, the video output is on the Red phono lead and not the expected Yellow lead!

Some other users' stations are described here [[5.6 GHz Equipment Examples]].

===Improvements to Commercial Units===

In CQ-TV 260, Achille I2GLI described improvements and additions to the Mateksys VTX-HV drone transmitter to make a high quality 18 watt output 5.6 GHz FM transmitter. One of the improvements was to replace the video and sound baseband circuitry. The published circuit diagram in online CQ-TV was a little unclear (although the printed version is good). The circuit diagram is reproduced below.
[[File:BandaBase.jpg|672px]]

===Mounting the equipment===
Due to the very high losses in co-ax cable at 5.6GHz it is recommended that you mount the units very close to the antennas and run long 12V dc, audio and video cables back down to the shack or operating position.

Be aware also, that whilst these units are very small they do run very hot in operation, and it is suggested that you provide a good heatsink for both Tx and Rx – mounting them in a diecast box on the back of their respective antennas is ideal.

[[File:GKQ 5.6v2.JPG|600px]]

Details of G8GKQ's transceiver setup is shown here (receiver unit on left & transmitter with fan on the right)

===Transmit amplifiers===

Whilst the basic units work very well and have been used to transmit over paths of 60km, power amplifiers to boost the 600mW transmitter signal to 2—4 Watts are available from several suppliers on eBay and other sites, and will significantly increase the path length that the units will work over. These amplifiers should be connected after the transmit unit, but before any antenna change over relay(s) – and remember that his will increase the volt drop on any long 12V cable feeding the transmitter at the masthead.

Be warned!! Several users have found these PAs to be "fragile", so you should always make sure that the antenna is connected – and all connectors done up tight – before applying dc or RF power. We are investigating whether they can be made more reliable by reducing the volts / input drive.

[[File:56PA.jpg|200px]]

==Antenna changeover relays==

The FPV equipment comes as separate Tx and Rx units. In order to operate on a single antenna, you will need an antenna changeover relay. Note, however, that the losses at 5.6GHz can be significant and care must be taken when wiring up the units to ensure RF cables are of good quality, and kept to a minimum length – semi-rigid cables fitted with SMA connectors are ideal.

PL259 and even BNC connectors are very lossy at 5.6GHz and should not be used, but the surplus SMA relays often available at rallys are ideal for 5.6 GHz.

See [[Antennae changeover relays|this wiki page]] for more details on suitable relays, 24 volt operation, and 4 port (or transfer) relays.

If no suitable relay is available, it may be cheaper to use separate antennas for receive and transmit as shown in the picture below – note the Tx and Rx units are mounted directly on the back of the flat panel antennas.

[[File:562.jpg|200px]]

===Reverse SMA===

Be aware that all the 5.6GHz FPV units use "reverse SMA" connectors (as used on WiFi equipment) and that all low-loss cables (unless bought specifically for the purpose) and surplus SMA relays will almost certainly have standard SMA connectors – which will not fit. Adapters from reverse to standard SMA are available on eBay or other suppliers – search for "RP-SMA to SMA adaptor" or similar wording.

==Antennas==

As 5.8GHz is used by broadband wireless networks, there is a wide choice of antennas available for use on 5.6GHz ATV. These can range from flat plates/panels to wire mesh (grid) dishes, as seen in the above pictures.

Horizontal polarisation has been chosen as the standard (waveguide feeds needs to have the long dimension of the aperture – and/or horn – vertically oriented when feeding dishes)

=== Satellite dishes ===

It is also possible to use a satellite mini dish with a suitable feed, such as a waveguide/horn to the design by G4NNS – see here for construction details: http://myweb.tiscali.co.uk/g4nns/FeedHorn.html

The picture shows a Sky mini dish fed with a WA5VJB log-periodic PCB feed http://www.wa5vjb.com/products1.html – these are available in the UK from G4DDK. http://www.g4ddk.com/Prices.html

Dishes of this size typically have a beam width of 4—8 degrees.

[[File:56 dish feed.JPG|400px]]

M1BKF found a very interesting 5.6GHz feed for standard f/d ratio satellite dishes; it contains what looks like a PCB yagi, and is available from:

<s>http://www.antennas-amplifiers.com/5.1-5.5-5.8GHz-WLAN-WiFi-Antenna/Feed-Illuminator-satellite-offset-dish-fd-0.5-0.8</s>

https://www.antennas-amplifiers.com/feed-Illuminator-satellite-offset-dish-fd-0.5-0.8

[[File:PCB dish feed.JPG|200px]] [[File:PCB dish feed2.JPG|300px]]

=== DIY BiQuad antennae ===

This web page http://buildyourownantenna.blogspot.co.uk/2014/07/double-biquad-sector-antenna-for-5-ghz-wifi.html has a well engineered double BiQuad antenna with a quoted 13dBi gain.

Note in the picture G8JAN has directly connected the Tx module to the antenna to avoid co-ax losses.

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

==Video equipment - Rx==
The receiver output will need to be directly connected to a monitor with a composite video input to view the received the signal – normally on a yellow phono or RCA connector.

===Video squelch defeat===

Beware of using modern flat-screen monitors which have a video squelch – these will not display noisy signals, and just give a blue screen until they get a strong video signal.

There are a number of circuits around to defeat the squelch and also improve the readability of the signal.

===Syncsmurf by PE1RQM=== – kits are available; details on the [https://translate.google.com/translate?hl=auto&sl=auto&tl=en-US&u=https%3A%2F%2Fwww.pe1rqm.nl%2Fsyncsmurf2%2F webpage here].

[[File:syncsmurf1.jpg|200px]]

Results are very impressive:

[[File:syncsmurf2.jpg|400px]]

===eachine FPV recorder===

Several people have reported that they are using these devices, available from various sites, and as well as defeating the monitor blue screen by inserting syncs on noise they have a single push button record facility. They record to an SD card which can be removed and the files viewed on a PC; users report that you need to use a good quality SD card, and that they have had problems with Kingston branded cards – Sandisk are preferred.

[[File:emachine dvr.JPG|300px]]

===Video sync processor===

[[File:cqtv 129.jpg|300px]]

Or any video sync processor may be usable such as the Advanced Converter Enhancer used by many stations on 23cms FM TV transmissions.

[[File:ACE.jpg|300px]]

==Video equipment - Tx==
An old camcorder with a yellow phono "video out" socket is an ideal video and audio source for the transmitter.

Don't forget that you will need to display your call sign to remain legal. This can be a video generator, a .jpg card reader with video out, or a piece of card with your call sign scribbled on it!

===Media card reader===

A simple way to generate test patterns is to use a media card reader loaded with .jpg files – these are available on several sites, just search for "SD card media AV player" – but make sure you get one which outputs PAL video.

[[File:av player.JPG|200px]]

===PicDream===
The PicDream project uses a single PIC chip and a 4MHz crystal to generate a black and white test pattern – simple but effective – the original project was described in CQ-TV 180 and re-printed in CQ-TV 247.

[[File:Picdream 247.JPG|400px]]

The PIC code is available for download here: batc.org.uk/cq-tv/software/picdream.zip

===Raspberry Pi - PA3CHM image generator===

CQ-TV 247 published details of a simple RPi-based test card generator by Ernest PA3CHM.

[[File:PA3chm.JPG|400px]]

Full details are on his website: http://www.pa3hcm.nl/?p=248

===Raspberry Pi - Portsdown patterns===
The BATC Portsdown project can be configured to deliver composite video and audio out from the RPi multi-jack plug.

[[File:GKQ July 2017 (Small).JPG|400px]]

This can be test patterns, RPi desktop, or the Portsdown camera and microphone – [[Analog Video Output|see this wiki page for more details]] making the RPi the only piece of video/audio equipment you need to drive the 5.6GHz transmitter.

===Stand alone Raspberry Pi animated test card generator===
This is the stand alone version of the animated test card generator that is part of the Portsdown software
[[RPi Test Card| - see this wiki page for more details]]

==On the air==

Using dish aerials of 30—60cm, line of sight ranges of 80km can easily be achieved.

P5 (noise free) FM ATV pictures have been exchanged over a 138km path using the equipment described on this page – the picture below shows G4CPE/P on Dunstable Downs being received at the Ridgeway, near Didcot, over a slightly obstructed 66km path.

[[File:CPE 5.6GHz.JPG|400px]]

Dunkery Beacon near Minehead, to Cleeve Common near Cheltenham.
The picture shows G8GTZ/P received by G8GKQ/P over the 138km path.

[[File:snap5 small.jpg|400px]]

2018-04-21: The UK "record" for a contact using standard FPV units was increased to 153km between GW3NWR/P at Bylchau, North Wales to M0KPW/P and G0HIK/P at the Kirkstone Pass Inn, Cumbria.

This has since been surpassed.

==FM voice only==

Several stations in the Gloucester and Bolton area are using these units for wideband FM voice only. This is achieved by simply putting high level (1V peak-peak) audio on the yellow video TX phono input – this modulates the main high level carrier with audio rather than video (the two audio phono connectors – red and white – can be ignored). On RX, the yellow phono connector of the receiver is simply connected to a line level input of an audio amplifier.

It is done this way because the two audio subcarriers transmitted by the unit are at a level 20dB lower than that of the main (video)carrier. However, as it is using the same bandwidth Rx and Tx system, performance will be no better than FM video – ideally the 480MHz RX IF would be tapped off in to an SDR or narrow band receiver to give significantly enhanced (+20db?) narrow band performance.

==Activity hot spots==

There is a Google map showing approximate locations of stations thought to be active on 5.6GHz FM – if you are on 5.6GHz, you can add or edit your station: https://www.google.com/maps/d/u/0/edit?mid=1e4keFSFWy6wLUQNF3IT3n6h90eU&ll=52.39133141509076%2C-1.8917942000000494&z=7

Known users include:

*Southern England = G8GKQ, G8GTZ, G0UHY, G8XZD, G4UVZ, G3VPF
*Dunstable area = M0SKM, G4CPE, G0WFT
*North-East = GB3KM, G1LPS, M0DTS
*Cheltenham = G0LGS, M0RKX and G4NZV (using WB audio only)
*Bolton Wireless Club = G4JLG, G6GVI, G8PEF, M0UFC, MW1FGQ (PW “Siren” Article)
*Ludlow, Shropshire = G8XYJ
*Yorkshire = G8BYN
*Norfolk = G4NJJ, G8JAN, G4WVU and M1BKF
*Cumbria - Barrow-in-Furness Radio Club project
*Merseyside - G3NWR

[[File:cpe2.jpg|400px]]

==More information==

Dave G8GKQ did a presentation at the BATC annual convention CAT17 in September 2017 on getting started on 5.6GHz ATV.
*The presentation is available here https://wiki.batc.tv/images/4/42/CAT17_5.6_GHzv2.pdf
*The video of the session is available on the BATC YouTube channel here https://www.youtube.com/watch?v=XJzGNsGmE9Y

==On line support / social media==

There is a thread running on the BATC forum where the ATV community are exchanging ideas and also posting results of the latest on air tests. http://forum.batc.org.uk/viewtopic.php?f=2&t=5026

Note that the BATC core team do not regularly visit Facebook pages - time is just too short to monitor everything and it's not easy to follow threads on Facebook.

==Technical information==

===SM201R===
The large RX chip in most units has had the part number removed, however it appears that a lot of receivers use the SM201R module. The spec and pinout are shown below but notice the frequency range of this particular unit does not seem to cover 5665MHz, so make sure the one you buy does!

[[File:sm201r 2.jpg|500px]] [[File:sm201r 3.JPG|200px]]

[[File:sm201r 1.JPG|500px]]

===S meter output===

Looking at the above table, it appears that the RSSI is available on pin 17 of the SM201R and could potentially be used for a signal strength meter to help align the antennas when setting up a QSO.

It also appears that the SM201R uses a 480MHz IF (same as the Comtech) and potentially could be modified with narrower filters to improve RF performance.

====Tx and Rx perfomance====

Initial measurements suggest the TX bandwidth is 25—30MHz.

[[File:5.6GHz spectrum.jpg|500px]]

This accounts for the quoted RX sensitivity at -80dBm which may be improved by an LNA but will ultimately be limited by the RX IF bandwidth.

===Channel Listings===

As mentioned above, the channel settings vary from manufacturer to manufacturer. This table is taken from the Tarot data sheet which uses the SM201R module but does include 5665MHz:

[[File:Tarot_Channels.jpg|603px]]

And this is the table for the Eachine TS835 transmitter:

[[File:Channels_2.jpg|619px]]

This table is from a "Fat Shark" transmitter that does not cover 5665 MHz:

[[File:Fat_Shark.PNG|300px]]

DigiTwist

2018-07-20T00:17:34Z

GI7UGV: Update forum link to new site.

DigiTwist is an experimental 2 axis satellite tracker, primarily for the HamTV transmitter on the ISS. 2 broadcast satellite dish positioners are connected together and are controlled by a dual Diseqc pcb. The estimated cost of the 2 positioners, the joiner bar and the controller is £130.

It is experimental in the sense that the satellite positioners were never meant to be used in this way and may fail. Development is continuing, particularly as to the size of the dish that can be carried. The 40cm dish shown is just for demonstration purposes. It has not yet received the ISS, mainly due to lack of opportunity.

More construction details and software, for early adopters of the test version of the Diseqc control pcb, will appear here shortly. The most difficult part is the drilling of the complex shape of the positioner rotor arm in the joiner bar. Quotations are currently being sought for production of a batch. To gauge demand, it would be helpful to register an interest by PMing or emailing me. g4ewj at yahoo dot com

If anyone can think of any improvements, particularly ways of joining the positioners together, please comment on the DigiTwist thread on the BATC forum. ''' https://forum.batc.org.uk/viewtopic.php?f=2&t=5181 '''

A presentation was given at CAT17: ''' https://www.youtube.com/watch?v=qC8CSi8kZTs '''

[[File:DigiTwist-hardware2.jpg|500px]] [[File:DigiTwist-controller2.jpg|500px]]

146 MHz RB-TV

2018-06-20T15:49:10Z

GI7UGV: /* 146MHz pre-amps */

UK radio amateurs with full licenses have been given access to an extension of the 2mts band between 146 and 147 MHz but only for experimental modes. This is done on a temporary basis and you will need to do an on-line application for a NoV to your current license using this link:

http://rsgb.org/main/operating/licensing-novs-visitors/online-nov-application/146mhz-147mhz-nov/

The RSGB band plan now includes (and encouraged) the use of Reduced Bandwith Digital ATV (RB-TV) using 500 KHz centered on 146.5 MHz. For more info on Reduced Bandwidth Digital television (RBTV) take a look at this [[:media:cqtvrbtv.pdf|RB-TV special edition of CQ-TV]].

===RB-TV equipment for 146 MHz===

RB-TV on 146 MHz is not possible using "normal" DATV equipment and requires the use of equipment developed specially for the mode. For more technical details take a look at our getting started guide to RB-TV. [[Media:Getting Started with RB-TV.pdf|Getting Started with RB-TV]]

====Transmit Equipment====

*The BATC Portsdown is great project involving some simple construction to get on air on 146 MHz - [[The Portsdown Transmitter|see this introduction page.]]

* The DATVExpress project offers a versatile and flexible transmit system for 146 MHz.

====Receive equipment====

Due to the very low symbol rate, normal Set top boxes and satellite receivers will not receive RB-TV. The MiniTioune project was developed specifically to receive RB-TV - [[MiniTioune|more details can be found on this wiki page.]]

Unless you use the new [[Serit tuner|Serit tuner with your MiniTioune]], standard satellite tuners will not cover 146 MHz and you will need an upconverter from 146 MHz to L band - you can either home brew the upconverter or use one of the following:

* Roberto Zech Elektronik DG0VE, upconverter, power amplifier, mixer/oscillator module, LNA etc. http://www.dg0ve.de/en/index.htm

===146MHz pre-amps===

You will need a filtered pre-amp before any up converter or tuner.

* The DG8 144 - 147 MHz pre-amp with filtering has proven to work very well on 146 Mhz RB-TV: - http://www.ifwtech.co.uk/g3sek/vhfdx/dg8-preamp-v7.pdf . Note kits were available from G4HUP who suddenly became SK in Feb 2017. Short kits are currently available from SDR-Kits. https://www.sdr-kits.net/DG8-Pre-Amp-2M-Short-Kit

* Minikits in Australia do a pre-amplifier but it may need more filtering. http://www.minikits.com.au/electronic-kits/rf-amplifiers/rf-preamplifiers/2m-RX-Preamplifier

====Filters====
As the VHF spectrum is very crowded and we are operating close to the FM transmitter band and the 2mt amateur band, filters are essential on both transmit on recieve - not only to project other users against spurious from DATV transmissions but to avaoid blocking of the DATV reciever.

Details of suittable filters are listed [[146 MHz filters|on this wiki page.]]

====Power amplifiers====

See this [[Power amplifiers|wiki page]] listing considerations and designs for 146 MHz power amplifiers.

5.6 GHz

2018-01-12T17:24:03Z

GI7UGV: /* More information */

[[File:5.6 GHz Orientation Small.jpg|300px|center]]
It is very easy (and low cost) to get on the air on 5.6GHz (the 6 cm amateur band), using the cheap modules intended to transmit “First Person Video” (FPV) back from drones to their operators. These units can be used without any modifications to get on air, and with simple WiFi plate or dish antennas (and a clear line of sight path) can be used to send pictures to stations using the same equipment over paths in excess of 50km.

==Frequency choice==

The UK amateur band plan is shown on the RSGB website here: https://thersgb.org/services/bandplans/html/rsgb_band_plan_2017.htm

[[File:bandplan.JPG|800px]]

GB3KM has a licenced input on 5665 MHz and this has been chosen as the primary ATV operating frequency. Audio WB-FM operators have been using 5825 and 5840 MHz. 5825 MHz is too close to the band edge for ATV, and 5840 MHz is marginal.

The FPV equipment receive and transmit frequencies are set using DIP switches, and most tune to 5665 MHz – but care needs to be taken when selecting equipment to make sure it does cover this frequency. Example channel tables are shown at the bottom of this page.

==Equipment==

The FPV units are widely advertised on eBay and other sites with titles similar to “Tarot 5.8G 600MW Telemetry TX/RX Combo for FPV Image Transmission TL300N” and are available at reasonable prices. The typical units are very small but have reasonable FM-TV performance with a quoted transmitter spec of 600mW output and receiver sensitivity of -80dBm. Amplifiers are available to raise the output power to 2 watts or more.

[[File:Tairot 1.jpg|400px]]

Be aware – we have found that on some receiver units, the video output is on the Red phono lead and not the expected Yellow lead!

===Mounting the equipment===
Due to the very high losses in co-ax cable at 5.6GHz it is recommended that you mount the units very close to the antennas and run long 12V dc, audio and video cables back down to the shack or operating position.

Be aware also, that whilst these units are very small they do run very hot in operation, and it is suggested that you provide a good heatsink for both Tx and Rx – mounting them in a diecast box on the back of their respective antennas is ideal.

[[File:GKQ 5.6v2.JPG|600px]]

Details of G8GKQ's transceiver setup is shown here (receiver unit on left & transmitter with fan on the right)

===Transmit amplifiers===

Whilst the basic units work very well and have been used to transmit over paths of 60km, power amplifiers to boost the 600mW transmitter signal to 2—4 Watts are available from several suppliers on eBay and other sites, and will significantly increase the path length that the units will work over. These amplifiers should be connected after the transmit unit, but before any antenna change over relay(s) – and remember that his will increase the volt drop on any long 12V cable feeding the transmitter at the masthead.

Be warned!! Several users have found these PAs to be "fragile", so you should always make sure that the antenna is connected – and all connectors done up tight – before applying dc or RF power. We are investigating whether they can be made more reliable by reducing the volts / input drive.

[[File:56PA.jpg|200px]]

==Antenna changeover relays==

The FPV equipment comes as separate Tx and Rx units. In order to operate on a single antenna, you will need an antenna changeover relay. Note, however, that the losses at 5.6GHz can be significant and care must be taken when wiring up the units to ensure RF cables are of good quality, and kept to a minimum length – semi-rigid cables fitted with SMA connectors are ideal.

PL259 and even BNC connectors are very lossy at 5.6GHz and should not be used, but the surplus SMA relays often available at rallys are ideal for 5.6 GHz.

See [[Antennae changeover relays|this wiki page]] for more details on suitable relays, 24 volt operation, and 4 port (or transfer) relays.

If no suitable relay is available, it may be cheaper to use separate antennas for receive and transmit as shown in the picture below – note the Tx and Rx units are mounted directly on the back of the flat panel antennas.

[[File:562.jpg|200px]]

===Reverse SMA===

Be aware that all the 5.6GHz FPV units use "reverse SMA" connectors (as used on WiFi equipment) and that all low-loss cables (unless bought specifically for the purpose) and surplus SMA relays will almost certainly have standard SMA connectors – which will not fit. Adapters from reverse to standard SMA are available on eBay or other suppliers – search for "RP-SMA to SMA adaptor" or similar wording.

==Antennas==

As 5.8GHz is used by broadband wireless networks, there is a wide choice of antennas available for use on 5.6GHz ATV. These can range from flat plates/panels to wire mesh (grid) dishes, as seen in the above pictures.

Horizontal polarisation has been chosen as the standard (waveguide feeds needs to have the long dimension of the aperture – and/or horn – vertically oriented when feeding dishes)

=== Satellite dishes ===

It is also possible to use a satellite mini dish with a suitable feed, such as a waveguide/horn to the design by G4NNS – see here for construction details: http://myweb.tiscali.co.uk/g4nns/FeedHorn.html

The picture shows a Sky mini dish fed with a WA5VJB log-periodic PCB feed http://www.wa5vjb.com/products1.html – these are available in the UK from G4DDK. http://www.g4ddk.com/Prices.html

Dishes of this size typically have a beam width of 4—8 degrees.

[[File:56 dish feed.JPG|400px]]

M1BKF found a very interesting 5.6GHz feed for standard f/d ratio satellite dishes; it contains what looks like a PCB yagi, and is available from http://www.antennas-amplifiers.com/5.1-5.5-5.8GHz-WLAN-WiFi-Antenna/Feed-Illuminator-satellite-offset-dish-fd-0.5-0.8

[[File:PCB dish feed.JPG|200px]] [[File:PCB dish feed2.JPG|300px]]

=== DIY BiQuad antennae ===

This web page http://buildyourownantenna.blogspot.co.uk/2014/07/double-biquad-sector-antenna-for-5-ghz-wifi.html has a well engineered double BiQuad antenna with a quoted 13dBi gain.

Note in the picture G8JAN has directly connected the Tx module to the antenna to avoid co-ax losses.

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

==Video equipment - Rx==
The receiver output will need to be directly connected to a monitor with a composite video input to view the received the signal – normally on a yellow phono or RCA connector.

===Video squelch defeat===

Beware of using modern flat-screen monitors which have a video squelch – these will not display noisy signals, and just give a blue screen until they get a strong video signal.

There are a number of circuits around to defeat the squelch and also improve the readability of the signal.

===Syncsmurf by PE1RQM=== – kits are available; details on the [https://translate.google.com/translate?hl=auto&sl=auto&tl=en-US&u=https%3A%2F%2Fwww.pe1rqm.nl%2Fsyncsmurf2%2F webpage here].

[[File:syncsmurf1.jpg|200px]]

Results are very impressive:

[[File:syncsmurf2.jpg|400px]]

===eachines FPV recorder===

Several people have reported that they are using these devices, available from various sites, and as well as defeating the monitor blue screen by inserting syncs on noise they have a single push button record facility. They record to an SD card which can be removed and the files viewed on a PC; users report that you need to use a good quality SD card, and that they have had problems with Kingston branded cards – Sandisk are preferred.

[[File:emachine dvr.JPG|300px]]

===Video sync processor===

[[File:cqtv 129.jpg|300px]]

Or any video sync processor may be usable such as the Advanced Converter Enhancer used by many stations on 23cms FM TV transmissions.

[[File:ACE.jpg|300px]]

==Video equipment - Tx==
An old camcorder with a yellow phono "video out" socket is an ideal video and audio source for the transmitter.

Don't forget that you will need to display your call sign to remain legal. This can be a video generator, a .jpg card reader with video out, or a piece of card with your call sign scribbled on it!

===Media card reader===

A simple way to generate test patterns is to use a media card reader loaded with .jpg files – these are available on several sites, just search for "SD card media AV player" – but make sure you get one which outputs PAL video.

[[File:av player.JPG|200px]]

===PicDream===
The PicDream project uses a single PIC chip and a 4MHz crystal to generate a black and white test pattern – simple but effective – the original project was described in CQ-TV 180 and re-printed in CQ-TV 247.

[[File:Picdream 247.JPG|400px]]

The PIC code is available for download here: batc.org.uk/cq-tv/software/picdream.zip

===Raspberry Pi - PA3CHM image generator===

CQ-TV 247 published details of a simple RPi-based test card generator by Ernest PA3CHM.

[[File:PA3chm.JPG|400px]]

Full details are on his website: http://www.pa3hcm.nl/?p=248

===Raspberry Pi - Portsdown patterns===
The BATC Portsdown project can be configured to deliver composite video and audio out from the RPi multi-jack plug.

[[File:GKQ July 2017 (Small).JPG|400px]]

This can be test patterns, RPi desktop, or the Portsdown camera and microphone – [[Analog Video Output|see this wiki page for more details]] making the RPi the only piece of video/audio equipment you need to drive the 5.6GHz transmitter.

==On the air==

Using dish aerials of 30—60cm, line of sight ranges of 80km can easily be achieved.

P5 (noise free) FM ATV pictures have been exchanged over a 138km path using the equipment described on this page – the picture below shows G4CPE/P on Dunstable Downs being received at the Ridgeway, near Didcot, over a slightly obstructed 66km path.

[[File:CPE 5.6GHz.JPG|400px]]

The current UK "record" for a contact using standard FPV units stands at 138km from Dunkery Beacon near Minehead, to Cleeve Common near Cheltenham.

[[File:snap5 small.jpg|400px]]

The picture shows G8GTZ/P received by G8GKQ/P over the 138km path.

==FM voice only==

Several stations in the Gloucester and Bolton area are using these units for wideband FM voice only. This is achieved by simply putting high level (1V peak-peak) audio on the yellow video TX phono input – this modulates the main high level carrier with audio rather than video (the two audio phono connectors – red and white – can be ignored). On RX, the yellow phono connector of the receiver is simply connected to a line level input of an audio amplifier.

It is done this way because the two audio subcarriers transmitted by the unit are at a level 20dB lower than that of the main (video)carrier. However, as it is using the same bandwidth Rx and Tx system, performance will be no better than FM video – ideally the 480MHz RX IF would be tapped off in to an SDR or narrow band receiver to give significantly enhanced (+20db?) narrow band performance.

==Activity hot spots==

There is a Google map showing approximate locations of stations thought to be active on 5.6GHz FM – if you are on 5.6GHz, you can add or edit your station: https://www.google.com/maps/d/u/0/edit?mid=1e4keFSFWy6wLUQNF3IT3n6h90eU&ll=52.39133141509076%2C-1.8917942000000494&z=7

Known users include:

*Southern England = G8GKQ, G8GTZ, G0UHY, G8XZD, G4UVZ, G3VPF
*Dunstable area = M0SKM, G4CPE, G0WFT
*North-East = GB3KM, G1LPS, M0DTS
*Cheltenham = G0LGS, M0RKX and G4NZV (using WB audio only)
*Bolton Wireless Club = G4JLG, G6GVI, G8PEF, M0UFC, MW1FGQ (PW “Siren” Article)
*Ludlow, Shropshire = G8XYJ
*Yorkshire = G8BYN
*Norfolk = G4NJJ, G8JAN, G4WVU and M1BKF
*Cumbria - Barrow-in-Furness Radio Club project

[[File:cpe2.jpg|400px]]

==More information==

Dave G8GKQ did a presentation at the BATC annual convention CAT17 in September 2017 on getting started on 5.6GHz ATV.
*The presentation is available here https://wiki.batc.tv/images/4/42/CAT17_5.6_GHzv2.pdf
*The video of the session is available on the BATC YouTube channel here https://www.youtube.com/watch?v=XJzGNsGmE9Y

==On line support / social media==

There is a thread running on the BATC forum where the ATV community are exchanging ideas and also posting results of the latest on air tests. http://www.batc.org.uk/forum/viewtopic.php?f=2&t=5026

Note that the BATC core team do not regularly visit Facebook pages - time is just too short to monitor everything and it's not easy to follow threads on Facebook.

==Technical information==

===SM201R===
The large RX chip in most units has had the part number removed, however it appears that a lot of receivers use the SM201R module. The spec and pinout are shown below but notice the frequency range of this particular unit does not seem to cover 5665MHz, so make sure the one you buy does!

[[File:sm201r 2.jpg|500px]] [[File:sm201r 3.JPG|200px]]

[[File:sm201r 1.JPG|500px]]

===S meter output===

Looking at the above table, it appears that the RSSI is available on pin 17 of the SM201R and could potentially be used for a signal strength meter to help align the antennas when setting up a QSO.

It also appears that the SM201R uses a 480MHz IF (same as the Comtech) and potentially could be modified with narrower filters to improve RF performance.

====Tx and Rx perfomance====

Initial measurements suggest the TX bandwidth is 25—30MHz.

[[File:5.6GHz spectrum.jpg|500px]]

This accounts for the quoted RX sensitivity at -80dBm which may be improved by an LNA but will ultimately be limited by the RX IF bandwidth.

===Channel Listings===

As mentioned above, the channel settings vary from manufacturer to manufacturer. This table is taken from the Tarot data sheet which uses the SM201R module but does include 5665MHz:

[[File:Tarot_Channels.jpg|603px]]

And this is the table for the Eachine TS835 transmitter:

[[File:Channels_2.jpg|619px]]

This table is from a "Fat Shark" transmitter that does not cover 5665 MHz:

[[File:Fat_Shark.PNG|300px]]