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[aprssig] Field Day ISS APRS Contacts? Doppler

Bob Bruninga bruninga at usna.edu
Wed Jun 20 16:13:40 UTC 2012


> I have made a few attempts and managed to copy one 
> weak beacon packet. I was at 437.550 +- doppler. 
> It is not easy like the vhf packet was.

And remember TX Doppler is in the opposite direction of RX Doppler.  So you
need 5 memories:

RX 437.560  TX 437.540  Approaching
RX 437.555  TX 437.545
RX 437.550  TX 437.550  Closest point
RX 437.545  TX 437.555
RX 437.540  TX 437.560  Receeding

Bob




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