[amsat-bb] Re: AO-27 Question

George Henry ka3hsw at att.net
Sun Jun 28 21:10:26 PDT 2009

Thanks for plugging my son's program, Greg!   I've been amazed at how 
accurate it is....  mode changes typically occur within seconds of predicted 
times, and, as the AO-27 site notes, the onboard clock can be up to 10 
seconds off.


George, KA3HSW

----- Original Message ----- 
From: "Greg D." <ko6th_greg at hotmail.com>
To: <kq6ea at pacbell.net>; <amsat-bb at amsat.org>
Sent: Sunday, June 28, 2009 1:02 PM
Subject: [amsat-bb] Re: AO-27 Question

Hi Jim,

Interesting...  That was probably the pass I was trying to work AO-27 too, 
but I didn't have any success at all.  All I got back was hash, with others 
audible below it.  I think my uplink was interfering my downlink locally, 
though it went away after the pass.  Gotta work on that.

But, in answer to your question, the satellite has a scheduled sequence that 
it goes through.  There's a program to predict when the different phases are 
going to kick in, downloadable from 
http://sites.google.com/site/ao27satellitescheduler/ and it shows exactly 
what you and I experienced during the pass.  I suspect it appeared like the 
satellite turned on with conversations already in progress because they 
jumped the gun a bit on the uplink, or weren't aware of the timer and were 
transmitting without being able to hear anything.  The digital parts of the 
pass are telemetry, and you can decode and contribute what you hear to the 
archive.  The main page is http://www.ao27.org.


Greg  KO6TH

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