[amsat-bb] Re: Predict 2.1.5

[Claudio Martins <ctpm@xxxxxxxxxxxxxxx>]

On Saturday 20 April 2002 18:20, Jonathan Naylor wrote:
>
> 2. Doppler shift on other than 2m and 70cms. AO-40 uses 2401 MHz for
> the downlink and uplinks are on 435 MHz and 1269 MHz. Also there is a
> downlink on 24 GHz where the doppler is not inconsequential and signals
> are weak.
>

  Predict 2.1.5 displays doppler on 2m and 70cm, but it can also supply the 
doppler shift value normalized to 100MHz if used as a tracking server. Start 
predict with -s switch (predict -s). It will go into multi-sat mode and 
listen on udp port 1210. Doppler queries to the predict server will be 
answered with 100MHz normalized doppler.  There are sourcecode examples of 
how to do this in the tarball.

  Converting doppler shift to other frequencies is trivial:

   Doppler Shift(frequency) = frequency / 100MHz x Doppler_at_100MHz

cheers

Claudio
CT3KD

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