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[aprssig] Field Day ISS APRS Contacts? Doppler

Ed Lizard Rosen n3gxh at speakeasy.net
Wed Jun 20 19:00:36 UTC 2012


On 06/20/2012 02:52 PM, Dave wrote:
> How can they be in opposite directions? ?

Physics. Do you speak it?   http://en.wikipedia.org/wiki/Doppler_effect
> 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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   Ed Lizard Rosen FF/EMTB N3GXH
    n3gxh at arrl.net
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