[amsat-bb] Re: Delfi-C3 and SEEDS over West Malaysia

Wouter Jan Ubbels wjubbels at gmail.com
Sat May 3 01:12:09 PDT 2008

Hi Sion,

I listened to the file, and it sounds fine. The only thing is that you were
probably tuned slightly to high, giving a too low audio pitch (on USB mode
that is) so that the carrier frequency is outside the capture range of
RASCAL (1400-1800Hz). If you have a program that can make a waterfall
display like spectran or MixW, you can try running that parallel to RASCAL
and try centering the signal on 1600Hz, best is to do this during the
transmission of AX.25 flags between the frames since these give discrete
spectral lines spaced 150Hz and the strongest one is the carrier which
should be around 1600Hz. RASCAL may sometimes gives false sync indications
with strong signals since it then tries to lock onto one of the sidebands.

hope that helps!


Wouter Jan Ubbels PE4WJ

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