In article <
f7114461-6dac-4c2c...@googlegroups.com>,
Mitch-
The articles that mentioned an offset referred to the center of the mark
and space frequencies for a particular modem. The center for your sound
card would be 1000 Hz. In the PK-232 manual I see that on HF Packet it
uses 2110 and 2310 tones, for a center frequency of 2210 Hz.
Reading about the offset, I understood the objective was to add the
center audio frequency to the radio's dial frequency for Lower Sideband.
So a 14.105 center frequency would require the receiver to be tuned to
14.106 for your sound card modem, or 14.10721 for a PK-232.
Working backwards, the stations I heard when tuned to 14.10546 should
have been centered at 14.10325. I suspect they were actually centered
at 14.10300. The combined error in my receiver and the very old
PK-232's tones may account for the difference. Trying a different
receiver and calibrating the PK-232 may be good ideas. For now I will
follow your advice and tune for best reception.
I would like to learn more about PSK31, but that is not one of the modes
of my old PK-232 modem.
Fred
K4DII