We also experienced a good bit of QRM on the the AO-92 downlink towards the end of the pass previous to the one mentioned in the subject line (~1450 UTC) during our demo yesterday. We had the same problem (though less of an effect) the day prior during testing of our setup, but slightly offset in time (the QRM showed up just before the 7/11 ~1515 UTC AO-92 pass). Definitely had the doppler shift features indicating it was another satellite in the 2m band and close to the AO-92 downlink. On the 7/12 1450UTC pass, the interferer was strong enough that it 'edged out' the AO-92 downlink and was captured by our doppler correction loop (ending the demo, but that was OK because we already got a few images direct, and then I jumped to the website to show them more images recovered by the community).
We used GNU Radio married to FoxTelem for the passes. I have the recorded IQ files for both passes where the , but haven't had a chance to go back and investigate what exactly was going on or hunt for which bird was the 'culprit' though now it seems CAS-4B is a good suspect......If I get a chance I'll play around with the flowgraph and see if I can manually tune in the AO-92 signal and filter out the interferer to see if I can recover any more telemetry/camera pieces.
Just offering another data point and similar experiences...
-Zach, KJ4QLP
Research Associate Aerospace Systems Lab Ted & Karyn Hume Center for National Security & Technology Virginia Polytechnic Institute & State University Work Phone: 540-231-4174 Cell Phone: 540-808-6305
On 7/13/2018 4:29 AM, John wrote:
Hi Hal,
I too have an FT-847, however instead of programming satellites into the memories, I let SatPC32 'get it right' for me, along with tuning for doppler and handling tones etc. It's a far easier solution.
Otherwise, you could go through the AMSAT OSCAR Status page, and grab all the birds you're likely to want to work from that list.
73, John (XLX)
-----Original Message----- From: AMSAT-BB amsat-bb-bounces@amsat.org On Behalf Of Hal Dale Sent: 12 July 2018 19:09 Cc: amsat-bb@amsat.org Subject: Re: [amsat-bb] AO-92 1626UTC 7/12 PASS CAMERA TEST
I have a FT847. Anyone have a suggested list of Sats to input in the memory?? Hal/WB4AEG _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb