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AO-10 spin rate

I measured AO-10 spin rate by receiving its beacon with FFTDSP. The
results is followings.

   DATE       Spin Rate                Picture
Oct  4, 1998     75s      http://www.din.or.jp/~m-arai/data/a981004.gif
Feb 16, 1999     82s      http://www.din.or.jp/~m-arai/data/a990216.gif
Mar  7, 1999     89s      http://www.din.or.jp/~m-arai/data/a990307.gif

It seems the spin rate is getting slow. Is that true? Did anyone
measured the spin rate?

JN1GKZ Masa   Tokyo Japan
   jn1gkz@jamsat.or.jp     http://www.din.or.jp/~m-arai/

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