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Re: PSK-31 MFSK Hell via AO-10



20 Hz/sec. is OK for AO-10. The doppler shift for the LEO satellites can be
18 kHz during a 15 minute pass with most of it during the middle of the
pass. Rates of 100 Hz/sec. aren't uncommon on mode J and mode B.

73,

John
KD6OZH

> As a little experiment, I changed the AFC filter constants in
> WinPSK and was able to track 20Hz/Sec psk31 signals.  I'm not a satellite
> guy so don't know what the typical doppler shift rates are so don't know
if
> this is enough.  Much more than 20Hz/sec and the AFC loop gets more tricky
> and you also have the issue of running outside the audio bandwidth during
a
> QSO and having to retune the receiver.


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