[amsat-bb] Doppler shift question

skristof at etczone.com skristof at etczone.com
Thu Jun 6 13:42:10 UTC 2019

But AM is just amplitude modulation imposed on an electromagnetic wave.
If you've got waves, I'm pretty sure you're going to have a Doppler

Maybe aviation doesn't show much Doppler because they are going
relatively slowly (compared to spacecraft) and they operate in the VHF
realm, where Doppler is less obvious (like 2m on the satellites). 

Steve AI9IN

On 2019-06-06 8:42 am, KC9SGV via AMSAT-BB wrote:

> More train Doppler effect.
> These are sound waves, but the RF FM principle is the same.
> Not sure why they don't use AM in space, like in aviation...I.e. NO Doppler effect.
> https://youtu.be/fWX38qjECyE
> Sent from my iPad

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