[amsat-bb] Re: Has the ARISSat-1 CW-2 frequency shifted?

Colin Hurst cjhurst at bigpond.net.au
Wed Aug 31 17:46:23 PDT 2011


Alan,
For the last week or so we have been observing it come out of eclipse.
I have noted at worst, a very slow 40Hz shift as ARISSAT1 warms up.
I update the TLE's every day for ARISSAT1 (possibly an overkill) but it is
always within +/-20 Hz at AOS that you quoted.
73
Colin VK5HI.

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Alan P. Biddle
Sent: Thursday, 1 September 2011 07:01
To: 'Ronald G. Parsons'; 'AMSAT-BB'
Subject: [amsat-bb] Re: Has the ARISSat-1 CW-2 frequency shifted?

Ron,

I have been catching a couple of passes a day for TLM since deployment.
After the initial tweaks, is has been consistently within +/ 20 Hz of the
predicted value.  I haven't seen a large jump, though I did tweak it down 20
Hz yesterday to refine my initial values.

73s,

Alan
WA4SCA



-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Ronald G. Parsons
Sent: Wednesday, August 31, 2011 4:15 PM
To: AMSAT-BB
Subject: [amsat-bb] Has the ARISSat-1 CW-2 frequency shifted?

A couple days ago, I noticed that to get a 500 Hz signal for CW-2 (nominally
145.9190 MHz) to decode the BPSK-1000 signal, I had to change the
unDoppler-shifted frequency on my USB receiver from 145.918500 MHz to
145.918280 MHz, a change of 220 Hz.

This new value have been consistent over a couple days of careful watching.
I don't believe it to be an error in the keps or clock as it has been true
both at the beginning and end of the pass. My receiver has been on for over
a month, so unless a component changed value suddenly, ....

Has ARISSat-1 changed, has my radio changed, or does only my hairdresser
know for sure?

Ron W5RKN
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