[amsat-bb] Re: [Advisors] AO-51 end of mission

Robin Haighton ve3frh at cogeco.ca
Thu Dec 1 16:52:53 PST 2011

I was very sorry to hear of the final Loss of AO-51 (Echo) as it was the
Last satellite developed by Amsat-NA and launched in 2005. As I recall much
of the work was carried out by Mark Kanawati, Jim White, chuck Green (who
accompanied the satellite to the Launch site) and Rick Hambly. My thanks to
73 Robin Haighton

-----Original Message-----
From: advisors-bounces at amsat.org [mailto:advisors-bounces at amsat.org] On
Behalf Of Andrew Glasbrenner
Sent: Tuesday, November 29, 2011 2:56 PM
To: amsat-bb; ans-editor at amsat.org; bod at amsat.org;
senior-officers at amsat.org; advisors at amsat.org
Subject: [Advisors] AO-51 end of mission

It is with a heavy heart I report that AO-51 has ceased transmission and is
not responding to commands. The last telemetry data indicated that the third
of six batteries was approaching failure to short, and observations indicate
the voltage from three cells is insufficient to power the UHF transmitters.
The IHU may continue to be operative.  Initial tests with the S band
transmitter were also not positive, although more attempts are in order. We
have tried leaving the satellite in an expected state where i
f voltages climb high enough, the 435.150 transmitter may possibly be heard.

The command team will regularly attempt communications with the satellite
over the coming months (and years). There is always the possibility that a
cell will open and we could once again talk to our friend while illuminated.
Thanks to all who helped fund, design, build, launch, command, and operate
AO-51.  It's 7 year mission has been extraordinary. Please support AMSAT's
Fox-1 project, and other AMSAT projects worldwide with your time and money.

For the AO-51 Command Team,

73, Drew KO4MA
AMSAT-NA VP Operations

Via the Advisors mailing list at AMSAT.ORG courtesy of AMSAT-NA

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