[amsat-bb] Re: Doppler Discussion

Tim - N3TL n3tl at bellsouth.net
Tue Jun 1 11:58:28 PDT 2010

```Clint,

Thank you for this. Please note that I got a "broken link" window when I tried to go to that page.

73,

Tim - N3TL

________________________________
To: amsat-bb at amsat.org
Sent: Tue, June 1, 2010 12:49:35 PM
Subject: [amsat-bb]  Doppler Discussion

>> ... Doppler always will have a more pronounced effect (in relative terms, of course, based on the frequencies being used) on the higher of the two ...

Here's the actual equation for determining Doppler shift ...

http://tinyurl.com/calc-dopp

Your generalization is correct. On a 45 degree pass of a sat that's in a circular orbit at 497 miles up, approximate Doppler shifts calculate to ...

At 15m, +/- 477 Hz
At 10m, +/- 659 Hz
At 2m, +/- 3.27 kHz
At 70cm, +/- 9.76 kHz
At 23cm, +/- 28.5 kHz
at 13cm, +/- 53.8 kHz

Clint, K6LCS
http://www.work-sat.com
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