[amsat-bb] Question about doppler correction software
s.wilson at yahoo.com
Fri Aug 31 07:54:41 PDT 2007
I have a question regarding software doppler correction - in particular
when using linear satellites.
I am working on some control software that is a little more flexible than
what I've used. I really like SatPC32 on Windows and Predict/gsat on
Linux. I haven't yet fallen in love with any available software, but
that's really a different story.
I can imagine that doppler correction for an FM sat is rather easy in that
you simply tune the transmitter/receiver to the published frequencies
depending on the operating mode.
I'm a little less sure how that would work for a linear satellite. As
mentioned before, I do have a chart from AMSAT that lists channelized
frequencies for them. If I can tune the transmitter such that the
frequency at the satellite is one of the listed frequencies, how sure can
I be that the receive is as published?
Can I extend that to the point where I would be able to automatically
determine frequencies (at the satellite) of the downlink for a given
uplink and then compute doppler from there? It would then be fairly
convenient to tune within the satellite's passband and let the computer do
Thanks for any feedback.
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