[aprssig] Field Day ISS APRS Contacts? Doppler

[Ed Lizard Rosen]

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
>>
>>
>> _______________________________________________
>> aprssig mailing list
>> aprssig at tapr.org
>> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
> _______________________________________________
> aprssig mailing list
> aprssig at tapr.org
> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
>
>


-- 
-- --
--    "Saving peoples' lives
    so they may live long enough
      to become witty."

   Ed Lizard Rosen FF/EMTB N3GXH
    n3gxh at arrl.net
    n3gxh at winlink.org (on the road)
    Days   410 965-8498
    Eves   410 655-4956
    Nextel 443 677-1427
Where was I now? http://www.findu.com/cgi-bin/find.cgi?N3GXH*
(n3gxh-3 is the Jeep, -1 is home, -2 is work, -14 is the truck)