[amsat-bb] Re: DelfiC3 Spin Rate: another period as well
Rob Hardenberg PE1ITR
rob at itr-datanet.com
Tue Apr 29 16:55:06 PDT 2008
Tracked the delfiC3 pass of 21:30UTC found also intervals between 33 and 44 seconds. It looks like
a complex movement with a spinrate of ~1,5 rpm.
This confirms your measurement:
Henk, PA3GUO schreef:
> Hi Rob,
> There is another effect as well.
>>From the ~22:00utc pass I made an mp3 recording.
> Looking at the signal variations there is also a period of around 36 seconds,
> which slowly increases to 50 seconds.
> I used LHCP polarization and 2x6 elements DK7ZB, TS2000X, no pre-amp.
> Have a look at this picture:
> Henk, PA3GUO
>> Hi All,
>> Good DelfiC3 pass here on 2008-04-29 18:20~18:30UTC. Decoded 223 packets with the Rascal
>> software. This time I used
>> automatic doppler correction and tracked object D. I have the impression that DelfiC3 is earlier
>> than object B.
>> As experiment I tried to determine the spinrate of delfic3 and counted the dips in the signal
>> level. Its 12 dips in
>> 1 minute period so the spinrate at the moment must be 12 rpm or some related number (24,6,3..
>> rpm). See screenshot:
>> 73 Rob PE1ITR
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