5.7DATV

[radiogareth]

Can anyone with rx capability on 5.76GHz check that DATV Easy driving a PLUTO produces working video on that frequency (ie decoded a picture)?
I get very fast lock with all the Data info coming up, but NO PICTURE.
I'm down-converting to 3.4GHz then using an Ionica front end to downconvert to 920MHz (Modified Ionica) then into a Picotuner.
Direct 3.4GHz (ie 9cms) gives almost instant lock and picture (for 9cms) but the TX source there is PD4 driving a Pluto at 3.4Ghz.
Wondering what's going on as the signal 'look' fine on the analyser.
Gareth

[ON1AVO]

Gareth,

I can confirm DATV Easy v3.08 works on 5760 MHz. See screenshot.
Used 6CM convertor: FPV Rx module with IF 480MHz => Minitioune, MER not great.

5760MHz RX (small).png (367.12 KiB) Viewed 2238 times

73 de ON1AVO
Freddy

[G4NZV]

Hi Gareth,
My guess is the IQ is swapped due to an extra mix in your downconverter process. To prove try sending a DVBS DATV signal and see if video can be seen properly. Remember DVBS2 does not work with a frequency inversion or IQ the wrong way round. Think of it as trying to listen to Upper Sideband signal using Lower Sideband setting on your receiver.
Another test of your system:
SDRAngel has the ability to swap IQ over when receiving DVBS2 and other signals. In Device Type press the Delta Frequency X then press the IQ button then OK.
73 Steve G4NZV

[radiogareth]

Thanks Freddy and Steve, firstly that the TX stream is probably OK and secondly that might well be the issue. I never really gave it any thought as I have previously lashed up a similar system but used a Titanium C band LNB as the second IF/down-converter. Maybe that inverts anyway as the LO is high side.....out of my depth here...you can tell
I'll do some tests....DVBS will be fine for the weekend after all, its only contest numbers
Gareth

[radiogareth]

Hmmm, same behaviour, quick lock on the header info, no video forthcoming.....but DATVEasy 3.08 on my laptop gives two green 'leds' but no kb/s, despite a full uninstall and reinstall.Sending something but maybe no picture info.....yet to try SDRAngel...tomorrow, I'm done-for today....
Gareth