[amsat-bb] Re: HF satellite?

Simon (HB9DRV) simon at hb9drv.ch
Fri Jun 5 10:23:16 PDT 2009

Some rough and ready calculations *assuming a LEO* are that PSK needs the TX 
frequency adjusting every second or so, certainly over the duration of a 
short PSK transmission no Doppler correction on TX at 29MHz will result in 
no QSO.

But there's plenty of software which can adjust an HF transmitter so it'll 
just be a question of user education. Myself I would probably TX with my 
TS-480 and RX with a TS-2000.

PSK-125 may be a better option as it is on 6m when there's an opening (such 
as today).

Simon Brown, HB9DRV

----- Original Message ----- 
From: <n3tl at bellsouth.net>

>I think it's a great idea. I suspect there will, indeed, be some Doppler 
> Although, I wonder.... How would Doppler's impact on PSK-31 be different 
> from, say, SSTV? I ask because the SSTV schedules on AO-51 have been 
> pleasantly surprising to me, in terms of the quality of image I was 
> getting.

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