What Alan said for sure. The previous pass they crossed paths very near to TCA. 91 was a bit stronger, but there was QRM. If it makes you feel better, no one got any images or pieces even on that last pass.
73, Drew KO4MA
-----Original Message----- From: AMSAT-BB [email protected] On Behalf Of Alan Sent: Thursday, July 12, 2018 2:49 PM To: 'christy hunter' [email protected]; [email protected] Subject: Re: [amsat-bb] AO-92 1626UTC 7/12 PASS CAMERA TEST
Christy,
Nice problem, usually, to have a crowded sky. ;) That is a tough geometry. I had a similar problem with my earlier pass due to a thick stand of trees which attenuated the AO-92 signal.
You didn't mention your equipment. The typical Elk/Arrow has a wide beamwidth, which is normally ideal, but makes it hard to reject a second signal in the same general area. If you have an antenna with a narrower beamwidth, you can sometimes reduce the interfering signal while still getting a usable signal for the target by careful pointing. FoxTelem with a FCD does a great job, but as you know it can be "spoofed" by a much stronger but similar signal. You can manually "steer" it a bit.
I have a system where the dongle feeds SDR#, and then audio to FoxTelem. This does allow you to narrow the RX passband, and tune precisely to the desired signal. You can ignore CAS-4B so long as it is near but not overlapping AO-92, which sometimes happens due to Doppler. You do need to keep AO-92 carefully centered, either manually or with computer control. This general approach is discussed in the FoxTelem manual.
While not hard, this approach is a bit more complicated, and may not be justified for very occasional work. Fortunately CAS-4B seldom causes a problem with the normal transponder downlink.
73,
Alan WA4SCA
<-----Original Message----- <From: AMSAT-BB [mailto:[email protected]] On Behalf Of christy <hunter <Sent: Thursday, July 12, 2018 12:36 PM <To: [email protected] <Subject: [amsat-bb] AO-92 1626UTC 7/12 PASS CAMERA TEST < <I was hoping to get a partial decode on the camera test this am, but <because it was a low pass (6deg) for me, the stronger signal from CAS-4B <(also overhead at the time) high speed telemetry signal captured the <telem decoder. Is there a way to prevent these stronger signals from <over-powering the telem decoder AO-92 target frequency? (Don't read this <as a complaint as having too many satellites) < <thanks, 73 Christy KB6LTY DM14 < < <--- <This email has been checked for viruses by AVG. <https://www.avg.com < <_______________________________________________ <Sent via [email protected]. 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 [email protected]. 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