Re: [amsat-bb] Doppler correction?

[k0vty@xxxxxxxx]

On that note , should one consider the speed required for mode S on the
ECHO bird ?

Joe  K0VTY
=============================
On Mon, 10 Nov 2003 22:40:18 -0800 Paul Williamson <kb5mu@AMSAT.Org>
writes:
> At 10:06 PM -0500 11/10/03, Anthony Monteiro wrote:
> >InstantTune updates the frequency every second.
> >There is no simple way to change this since it
> >is driven by InstantTrack/OrbitDRV which updates
> >the satellite velocity every second.
> 
> Nominally every 1.7576 seconds (32 ticks of the PC's 18.2 Hz 
> clock).
> 
> It should not be difficult (for me) to provide a patch to OrbitDRV 
> that makes this happen more frequently, if that's useful. It might 
> be 
> better architecturally if the tuning program just interpolated, 
> though.
> 
> The original value was chosen to be slow enough that OrbitDRV's 
> calculations didn't use up too much of the CPU even on the slowest 
> 8088-class PC. On anything approaching a modern computer, that is no 
> 
> longer a problem. Now the limitation would be how fast InstantTune 
> can command the radio.
> 
> 73  -Paul
> kb5mu@amsat.org
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