Re: [amsat-bb] AO-40 spin

["Richard D. Burgan" <wc8j@xxxxxxxx>]

Hi,

I wonder if the satellite could be spinning off center in such a way that it
would increase the spin radius of the S-Band antenna and thus increase the
doppler "wobulation" ?
73's de Rich @ WC8J

f6agr wrote:

> On 1/4/01 7:58 PM, Richard D. Burgan at wc8j@raex.com wrote:
>  I saw an AMSAT-BB post yesterday where Phil, KA9Q calculated the
> > doppler at +/- 14 Hz.  All the indications I had were that it is more than
> > that.  So there is something going on.  I roughly measured the rotation
> rate
> > at
> > 17.4 rpm.
>
> I carefully analysed the S2 beacon Doppler sine curve  induced by the
> satellite rotation  yesterday 04jan2001 around 09:51 UTC (MA/phase 25).
> Using the powerful zoom functions of CoolEdit 2000 spectral analysis
> software , I got the following values:
> - peak to peak freq shift: 19.0 Hz
> - rotation: 17.86 rpm
>
> It should be very interesting to perform such measurements from time to
> time, just to detect any rotation speed variations.
>
> Cheers
>
> Jean-Louis F6AGR
>
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