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

[Rob Hardenberg PE1ITR]

Hi Henk,

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:
http://www.pe1itr.com/satellite/delfic3_pe1itr_29apr2008_2130_spin.png

73 Rob

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:
> http://home.vianetworks.nl/users/hamoen/pa3guo/dc3_29apr2008_pa3guo_rotation.jpg
>
> 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
>
>
>