Measuring QSB cycles of AO-10 beacon give us its spin period. The following graph and table show the current AO-10 spin period and spin rate. This observation is done with FFTDSP software.
You can see FFTDSP picture by clicking the date.
AO-10 spin rate is up and down. The spin rate is rapid slowing now. It is not clear why the spin rate is fast and slow. And it is also unknown the spin rate will be faster in the future.
There is no fluctuation on the beacon at 24th April. It seems AO-10 has woken up!
|Date||Spin Period [sec]||Spin Rate [rpm]||Comment|
|Sep 14, 98||84||0.714||by WL7BQM|
|Sep 26, 98||79||0.759||by WL7BQM|
|Oct 04, 98||75||0.800|
|Oct 07, 98||74||0.811||by WL7BQM|
|Oct 11, 98||73||0.822|
|Oct 13, 98||72||0.833||by WL7BQM|
|Nov 21, 98||63||0.952|
|Feb 08, 99||81||0.741||by WL7BQM|
|Feb 16, 99||82||0.732|
|Mar 07, 99||89||0.674|
|Mar 21, 99||95||0.632|
|Mar 27, 99||99||0.606|
|Apr 03, 99||104||0.577|
|Apr 10, 99||109||0.550|
|Apr 18, 99||115||0.522|
|Apr 24, 99||124||0.484|
|May 02, 99||135||0.444|
|May 07, 99||144||0.417|
|May 09, 99||149||0.403|
|May 15, 99||163||0.368|
|May 18, 99||172||0.349|
|May 22, 99||186||0.323|
In sleep mode, AO-10 beacon sometime became FMing. When the signal becomes FMing, the fluctuation of the beacon is getting very unstable.
Click the follwing date, then FMing beacon shows up.
AO-10 transponder and beacon is ceased during eclipse periods. The following pictures are AO-10 beacon status just before/after eclipse.