[amsat-bb] Doppler shift question

Burns Fisher burns at fisher.cc
Thu Jun 6 17:49:23 UTC 2019

...and of course there is no reason NOT to adjust the lower frequency
especially if it is computer controlled.  It's just that lower frequencies
do not change as much for a given satellite speed (see JoAnne's Doppler
equation to determine why :-).  And as someone said, the FM capture effect
makes it even less important.

On Thu, Jun 6, 2019 at 12:01 PM JoAnne K9JKM via AMSAT-BB <
amsat-bb at amsat.org> wrote:

> > If 70cm is the UPlink, you'll adjust your transmit frequency UPward
> through
> > the pass.
> > If 70cm is the DOWNlink, you'll adjust your receive frequency DOWNward
> > through the pass.
> I showed a quick slide with the Doppler equation on it ... that
> delta-lambda
> stuff. Then I told them pretty much what you said ... and I could hear a
> "Phew!" from the audience.
> --
> 73 de JoAnne K9JKM
> k9jkm at amsat.org
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb

More information about the AMSAT-BB mailing list