[amsat-bb] Re: ARISSat TLM decoding using FCD

g0mrf@aol.com g0mrf at aol.com
Mon Aug 8 05:23:32 PDT 2011

Hi Henk.

I've had some issues with decoding BPSK too.  Worked fine on the first day, then unable to decode anything.
Eventually I reloaded the software and played a wav file through the system. Finally it began decoding again. I don't really know what the problem was. It still will not send tlm via the internet and I can't get sound out...Hence the wav files.

Problem is the wav file I have is large so I cant send it to you to try. Perhaps some one has 30 seconds worth that does decode, then we can use that as a standard to check our systems.

I've been tracking doppler by hand. Seems to work OK but it's very important to keep the CW in the 'blue' window.
I would think jumps would not be good. Perhaps frequent doppler updates.  - So very small jumps.

I also heard HB9 last night on the transponder, but in low power mode (45 sec)that is difficult. - I'll wait for some daylight passes.

Good luck

David G0MRF





-----Original Message-----
From: PA3GUO <pa3guo at amsat.org>
To: amsat-bb <amsat-bb at amsat.org>
Sent: Mon, 8 Aug 2011 10:41
Subject: [amsat-bb]  ARISSat TLM decoding using FCD

Just sharing the results of my recordings of last night:
(using the FCD + HDSDR)


-          FM voice works fine

-          Xponder works fine (HB9AOB was very clear)

-          CW decoding works fine (the Tuning indicator locks on the CW

-          BPSK decoding did not work (I hear & see the signal, but no


Is the BPSK decoding very sensitive to doppler / freq hops ?


Henk, PA3GUO


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