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[aprssig] Field Day ISS APRS Contacts? Doppler

Dave kc6ete at gmail.com
Wed Jun 20 18:52:23 UTC 2012


How can they be in opposite directions? ?

Bob Bruninga <bruninga at usna.edu> wrote:

>> 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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