[amsat-bb] AO-51 magnet reversal tonight
glasbrenner at mindspring.com
Wed Dec 2 08:36:29 PST 2009
On the 2242UTC pass of AO-51 tonight, we will try for the first time to
reverse the magnet and "flip" the orientation of the satellite. While we
do this, the 435.300 transmitter will be shut off for about 10 minutes.
If the reversal is successful, we should see some changes in signal
levels and patterns. This particular maneuver has not attempted since
I'd appreciate any signal reports or observations from this evening and
the next few days be emailed to ao51-modes at amsat.org or ko4ma at amsat.org.
In related news, as the spacecraft spin inexplicably continues to slow,
we are seeing increasingly larger dips in the spacecraft voltage when
the panels are poorly aligned to the sun. The immediate result of this
is that we have had to decrease the power on both transmitters to
prevent discharging the batteries too deeply. We'll be working on
mitigating strategies this coming month. This may include using existing
software routines to automatically lower the downlink power during these
dips in power production, or resolving to run one transmitter at a time
instead of simultaneous digital and repeater downlinks.
73, Drew KO4MA
AMSAT-NA VP Operations
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