[OZAPRS] Homebrew HF APRS transmitter

[Peter Wicklein]

 Douh! ;-) Damn you metric system 
 
Regards
 
Pete

> Date: Thu, 7 Jul 2011 12:56:17 +1000
> From: kevind at esi.com.au
> To: ozaprs at aprs.net.au
> Subject: Re: [OZAPRS] Homebrew HF APRS transmitter
> 
> 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
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