[amsat-bb] Re: AO-51 magnet reversal tonight

Alan Cresswell alancresswell at xtra.co.nz
Thu Dec 3 11:04:58 PST 2009

With two usable passes over ZL last night the most notable feature was the
frequent polarity shifts.  Certainly good strong signals but difficult to
tell how it compares to previous signal levels.


-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Andrew Glasbrenner
Sent: Thursday, 3 December 2009 16:43
To: David Wing
Cc: 'amsat-bb'
Subject: [amsat-bb] Re: AO-51 magnet reversal tonight

David Wing wrote:
> I have to agree with John...significant increase in the polarity switching
> noticed both on the US west coast pass last night (02-Dec-09 0158) and
> morning (03-Dec-09 1417).  This morning's pass required a lot of
> switching...some of it back-to-back (10 seconds between switching).  Also,
> it took a long time to acquire the bird and I lost it early as well.
We are still sifting through the telemetry, but as Tom suggested in his 
email, the satellite is precessing (wobbling) quite severely. This will 
calm down as the hysteresis rods do their job. Initial reports from 
Australia and New Zealand indicate stronger signals, and about the same 
from South Africa. There are some peculiar things about the magnetic 
field near South Africa, so that doesn't surprise me too much, but is 
worth digging into once we get the telemetry down.

73, Drew KO4MA
AMSAT-NA VP Operations
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