[amsat-bb] AO-92 in Camera Mode

[Scott]

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

=======================

On Wed, Jul 10, 2019 at 11:28 PM Hans BX2ABT via AMSAT-BB <
amsat-bb at 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
> >
>