[amsat-bb] AO-92 1626UTC 7/12 PASS CAMERA TEST

[Andrew Glasbrenner]

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 <amsat-bb-bounces at amsat.org> On Behalf Of Alan
Sent: Thursday, July 12, 2018 2:49 PM
To: 'christy hunter' <cchunter3 at mindspring.com>; amsat-bb at amsat.org
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:amsat-bb-bounces at amsat.org] On Behalf Of christy
<hunter
<Sent: Thursday, July 12, 2018 12:36 PM
<To: amsat-bb at amsat.org
<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 AMSAT-BB at 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 at 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