[amsat-bb] ARISSat daylightpower recovery time

Richard Ferryman g4bbh at btinternet.com
Sat Sep 24 02:35:13 PDT 2011

Although I have severely limited satellite visibility I have been copying telemetry from ARISSat1 for some weeks.  I live in a valley surrounded by chalk hills and cliffs over 100 metres higher than me so my visible horizon is +12 degrees to +18 degrees at best.  Also my 3+3 element short crossed yagi and rotator are in the attic!  This worked beautifully when the satellite batteries held up and now when ARISSat is powered up.  However I notice it can take 10 minutes or more from the time the satellite enters sunlight until the system bursts into life.  At present this means loss of telemetry at this location when ARISSat is over the Atlantic, and even on overhead passes if it has been in sunlight for less than 10 minutes.
Question is why it takes ARISSat so long after entering sunlight before it starts transmitting?  Surely if the batteries have failed high resistance the voltage should be up within seconds of entering sunlight.
Dick G4BBH

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