[amsat-bb] Re: DelfiC3 Spin Rate: another period as well

Henk, PA3GUO hamoen at iae.nl
Tue Apr 29 13:49:09 PDT 2008

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:
> http://www.pe1itr.com/satellite/delfic3_pe1itr_29apr2008.jpg
> 73 Rob PE1ITR
> http://www.pe1itr.com

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