AO-51

AO-51 end of mission

Subject: [amsat-bb] AO-51 end of mission
From: Andrew Glasbrenner
Date: Tue, 29 Nov 2011 14:56:10 -0500 (EST)

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 if
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



http://www.amsat.org/amsat-new/echo/