[amsat-bb] SO-50 Frequency Drift

Tom Schuessler tjschuessler at verizon.net
Mon Jun 9 01:19:32 UTC 2014

I will say that the fact that the actuality of the 5KHz lower than published
frequency (Known for years) is the reason that often times you here a newby
on the bird, throwing out his call, getting responded to but never answering
back.  I had a good QSO on HF a bit back, mentioned "I do AMSAT" and he said
something to the effect, "I tried listening and calling but never heard
anything".  I told him about the "Actual vs. published"  frequencies.  He
says "Well that probably explains it then".  Even K6LCS's great pages at
http://www.work-sat.com/Sat_Skeds.html do not refer to the offset.  I am
convinced that this disparity is the cause for at least some of the QRM on
that bird, not all but some.

Tom Schuessler
n5hyp at arrl.net

Message: 2
Date: Sat, 7 Jun 2014 16:47:19 +0200
From: Ib Christoffersen <oz1my at privat.dk>
To: Koos van den Hout <koos at kzdoos.xs4all.nl>
Cc: amsat-bb at amsat.org
Subject: Re: [amsat-bb] SO-50 Frequency Drift
Message-ID: <70.98.04540.7F523935 at fep45>
Content-Type: text/plain; charset="iso-8859-1"

Hi Koss and Paul,
I do not think that the "normal" center frequency is 436.795 MHz.

I use two frequencies for the downlink in SatPC32:

436.791 and 436.788 MHz.

I have heard it suddenly jump about 5 kHz during a pass - but that is some
time ago.

The two frequencies above are not always spot on but close enough.

Have a nice weekend all.


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