6 Jun
2019
6 Jun
'19
9:42 a.m.
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 effect.
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.
KC9SGV
Sent from my iPad