Greg AB7R wrote:
> Other than that
> there's no difference between AFSK and DataA.
Actually that turns out not to be the case if you care about the frequency
you are tuned to, e.g. for spotting purposes. Data A is Upper sideband and
the dial displays the suppressed carrier frequency (as it does in SSB).
AFSK A, on the other hand, is Lower sideband, and the dial displays the
actual Mark frequency of an RTTY signal tuned in at the selected PITCH
(e.g. if PITCH is set to 2125, the display shows the carrier frequency
minus 2125 Hz).
So to receive a PSK31 station on 14071.5 kHz using narrow DSP filtering,
in DATA A you would tune to 14070.00 kHz and set your audio tone to 1500
Hz, but in AFSK A you would tune to 14071.5 kHz and set your audio tone to
2125 Hz (assuming a PITCH setting of 2125-170) - or, to really center the
signal exactly, tune to 14071.585 kHz and set the audio tone to 2210 Hz.
73,
Rich VE3KI
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