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Re: Doppler correction?



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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