[OZAPRS] Homebrew HF APRS transmitter

[Kevin Dawson]

G'day.

On 07/07/11 12:39, Peter Wicklein wrote:

> Since you are obviuosly a risk taker and like to stir the pot a bit ;-)
> and have brought the subject of netting back up again... I thought I
> thought I would joint you and say I'm surprised that nobody has
> discussed the issue of the effects of doppler on mobile stations and how
> it affects the the signal at 10MHZ. and what it will do to all the hours
> of alignment that people are currently perfoming. See my calcs below.

A small misteak in your calcs - you've specified the speed as 110 km/s, 
not km/h.  About 3600 times the effect :-)

Doppler shift at 10MHz at 110 km/h is roughly 1 Hz.

Kevin