[amsat-bb] SO-50 & frequency stability as of late

Bob- W7LRD w7lrd at comcast.net
Mon Sep 8 16:05:53 UTC 2014

I noticed that and RIT "fixes" it. 

73 Bob W7LRD 

----- Original Message -----

From: "Clayton Coleman" <kayakfishtx at gmail.com> 
To: "AMSAT-BB" <amsat-bb at amsat.org> 
Sent: Monday, September 8, 2014 8:54:25 AM 
Subject: [amsat-bb] SO-50 & frequency stability as of late 

I have been noticing some irregular shifts in SO-50's downlink 
frequency the past several days.  I noticed it in the past but it's 
been a while since this occurred.  Several others are reporting it as 

At my AOS today (15:12 UTC, orbit # 62976), SatPC32 had predicted the 
downlink to be near 436.801 MHz, when in fact I was receiving the bird 
at 436.793.  It proceeded to jump up to 436.795 at my TCA before 
making it's way down to 436.780 near my LOS. 

This seems to be posing some issues for people using full computer 
control and also those who stick to pre-programmed memory channels to 
make frequency adjustments during a pass. 

Considering this recent frequency instability, I would recommend you 
manually tune for the strongest downlink frequency.  This would help 
eliminate some issues with stepping on stations engaged in existing 
QSO's.  An alternative would be to try using RIT if you insist on 
computer control. 

The old rule applies -- if you can't hear, don't transmit. 

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://amsat.org/mailman/listinfo/amsat-bb 

More information about the AMSAT-BB mailing list