[amsat-bb] Re: Delfi C3 first orbit

Rick Mann rmann at latencyzero.com
Sun Apr 27 17:54:32 PDT 2008


On Apr 27, 2008, at 17:49:32, Andrew Glasbrenner wrote:

> Let me suggest that for the first couple of orbits you forego the  
> automatic Doppler tuning and just tune the +/- 3 kHz by hand. You'll  
> have a much greater possibility of success. Frequencies may not be  
> stable or exactly as published, and keplerian elements are an  
> educated guess at this stage. Predictive Doppler tuning is a recipe  
> for failure until those parameters stabilize. On the other hand, if  
> you have a TNC or program with Costas loop tuning for the 1200 baud  
> BPSK, you are a step ahead.
>
> Just a bit of advice, take it or leave it.


That sounds good; I'll use the R1500 and tune manually. I hope the  
pitch changes in the recorded audio don't prevent it from being decoded.

-- 
Rick



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