SDR Television

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G8KOE
Posts: 221
Joined: Fri Aug 09, 2019 8:14 am

SDR Television

Post by G8KOE » Tue Apr 22, 2025 8:03 am

Hi,.
Downloaded an installed SDR Television already had SDR Console 3.4 installed
All looked ok but program wouldn’t start.
Instructions said you must install both kits.
I did this from links provided SDR Television now started.
Install HEVC Video Extensions
Now receive the Beacon
Time to read the manual!

Thanks Simonn G4ELI for all your work!

Martin
G8KOE

PS This is on Win 11 i7 PC
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radiogareth
Posts: 1370
Joined: Wed Jan 06, 2016 9:46 am

Re: SDR Television

Post by radiogareth » Tue Apr 22, 2025 11:50 am

Ditto, got it installed on both my desktop and my decent laptops. Beacon and my own 437 too. About 1dB less MER than my MT on the same splitter for the beacon. Quick to lock too :-)
Gareth
(2x0.79p poorer)

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g6hfs
Posts: 319
Joined: Thu May 26, 2022 3:13 pm

Re: SDR Television

Post by g6hfs » Tue Apr 22, 2025 7:58 pm

All good here with SDR Television.

Brian
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G8KOE
Posts: 221
Joined: Fri Aug 09, 2019 8:14 am

Re: SDR Television

Post by G8KOE » Wed Apr 23, 2025 5:48 am

TX now working!

Should have read the Manual.

“OBS-VirtualCam
obs-virtualcam is a plugin for OBS Studio , transforming the output video to a virtual DirectShow device. Note: This is not the same as OBS Virtual Camera, a different plugin!

Download from miaulightouch/obs-virtual-cam . Recommended version is 2.1.2.”

I have what looks like a crown on my signal (three humps).

CPU load is so low excellent work from Simon.

Martin
G8KOE

g0mjw
Posts: 2567
Joined: Sat Sep 20, 2014 9:15 am

Re: SDR Television

Post by g0mjw » Wed Apr 23, 2025 8:42 am

Martin

The crown is not specific to your status, it is because I think you are using a 2.304 MHz sample rate with a 333ks/s signal. If you go to 960kHz bandwith, it will go away. There seems to be something not quite right in the TX code.

Mike

G8KOE
Posts: 221
Joined: Fri Aug 09, 2019 8:14 am

Re: SDR Television

Post by G8KOE » Wed Apr 23, 2025 10:28 am

Thanks Mike that fix it.

I am getting there slowly.

Blown away with results so far.

Martin
The King without a crowm.

G8KOE
Posts: 221
Joined: Fri Aug 09, 2019 8:14 am

Re: SDR Television

Post by G8KOE » Thu Apr 24, 2025 6:29 am

Stuttering On Picture

I had some stuttering on picture that wasn't there when I first started testing.
Looking at my OBS settings I have many profiles setup for different applications.
Selected the profile with correct settings for SDR Televisionall now OK.

Martin
G8KOE

radiogareth
Posts: 1370
Joined: Wed Jan 06, 2016 9:46 am

Re: SDR Television

Post by radiogareth » Fri Apr 25, 2025 6:18 am

Please share them if possible Martin, I wasn't aware of the concept let alone having more than one profile myself.....
Gareth

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G3GJA
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Joined: Sun Nov 20, 2011 3:44 pm

Re: SDR Television

Post by G3GJA » Fri Apr 25, 2025 9:28 am

A warning: when using the Pluto SDR, do not transmit with the drive level higher than -33.75dB!!

There's something odd in the level control because increasing the drive from -33.75dB to -30dB causes the output shoulders to jump by 10.8dB. The excessive regrowth might be because the Pluto has hit the threshold of non-linearity or there's something weird going on with the drive level steps. See the SA screenshots below, noting the Delta Marker levels.


-33.75dB Drive Level
-33.75dB Drive Level
-33.75dB.jpg (56.17 KiB) Viewed 1399 times

-30dB Drive Level
-30dB Drive Level
-30dB.jpg (56.1 KiB) Viewed 1399 times

The performance is likely to be different with other SDRs, but as the Pluto is the cheapest Tx option it is likely to be the most popular.

This is a beta software, so be careful and when using it on air and be patient. A huge amount of work has gone into this, so fixes might take a while.

Clive G3GJA

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g6hfs
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Re: SDR Television

Post by g6hfs » Fri Apr 25, 2025 10:18 am

Hi Clive,

Agree regrowth is normally caused by over driving, if you use a pluto or libresdr to transmit they both do it, think you are seeing that sdr television give a higher level output than obs for a fixed drive level, that is why I have a fixed attenuated output I have never seen it directly from my pluto it maybe a firmware issue on your pluto.

Brian

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