RE: [amsat-bb] AO-10 tumbling ??

[Jean-Louis.RAULT@xxxxxxxxxxxxxxxxxxx]

Hardy

I made a similar observation 2 days ago during the evening.
I used SPECTROGRAM, a sofware FFT analyser, to watch carefully amplitude and accurate frequency shifts of the  beacon carrier  during more than 1 hour (and recorded the audio at 5.5 kHz sampling on an IOMEGA ZIP cartridge for further analysis).
There was no random FMing coming from ham activity.
I noticed that:
 - the former 30 s deep QSB  was replaced by slight QSB (less than 1 minute long) with a much longer period (some minutes),
 - regularly, each xyz minutes, the carrier frequency was shifting down a few Hz for a few seconds.
I dont give the exact durations because I'm not at home now and I don't have the records with me.
Nice challenge to imagine the 3D movements of AO-10 with such fading and FMing data !!

Tchuss

73 de Jean-Louis F6AGR


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De: dc8ts@t-online.de
A: amsat-bb@AMSAT.Org


This morning when AO-10 came over my horizon there was no signal to
be heard for minutes ( not the usual half minute QSB ) then the signal
popped up and after some time vanished again for minutes.
At that time the satellite was completely in sunlight
I checked the beacon - nothing - then after several minutes the beacon
emerged from the noise fming a bit. I could hear also FMing on the other
signals.
It looks like the satellite started tumbling very slowly moving the
solar cells out of the sunlight for periods of minutes.

Anybody made similiar observation ??


Hardy DC8TS/KC2DMA ex S92RS


best regards
Reinhard Schulze
dc8ts@amsat.org
dc8ts@t-online.de

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