Hi Hans.
While not GQRX, if you'd like to use the screen shot of HDSDR in an old tweet I posted some time ago, you can see the RF and Audio-Out bandwidth settings required to successfully forward AO-92's high-speed data stream to FoxTelem:
https://twitter.com/scott23192/status/953288770555645952
... in short, around 20k worked well for both RF and Audio-Out. 15k is usually perfect for most 9600 baud data, but to err on the side of caution I had found that 20k produced good results with AO-92's camera data stream. The real deal-breaker for the higher data rates is filtering the audio output at too narrow of a bandwidth. That'll get you every time.
GQRX has a little "..." menu that's easy to overlook right beside the demod MODE selection. For a data stream like AO-92's you'll want either the 17k or 25k setting. Experiment and see what works best!
-Scott, K4KDR
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On Wed, Jul 10, 2019 at 11:28 PM Hans BX2ABT via AMSAT-BB < amsat-bb@amsat.org> wrote:
I just received my first HS data from AO-92. Nothing was decoded using FoxTelem, but I got the IQ file to play around with. It was a low pass for me, so signals were only 20 db over noise using my AirSpy mini. That might be too little, although I can receive Falconsat-3 at those levels without any problems.
What are the settings to watch out for decoding HS data (deviation, soundcard, Foxtelem)? Or should it "just work"? The only difference I can see between FS-3 and AO-92 is that audio from GQRX is going out to PacSat Ground Station via UDP and Foxtelem gets it from GQRX via a virtual audio loop (set in Pavucontrol).
Still exited to receive AO-92 with HS data for the first time. I saw on Twitter that JA0CAW did get part of an image, so for him it did work.
73 de Hans
BX2ABT
On 07/11/2019 10:27 AM, Chris Thompson via AMSAT-BB wrote:
For anyone decoding images and using FoxTelem with Doppler Tracking
enabled
I would appreciate any feedback on how high speed data is being decoded. Especially if you decoded camera frames in previous runs, like last October, and can compare.
This was a new feature and previously tracking of the high speed signal
was
not great. Let me know if it is better (or worse!)
73 Chris