Bert Hyman wrote:
I've picked up a handful of programs for various digital modes and
driving my PC's soundcard with the line-out audio from my TenTec Omni 7
have no problem copying signals once I figure out what mode they are.

However, all these programs have either AFC or some other way of
decoding a signal pretty much independent of what frequencies the tones
are on, so long as they're inside the passband, so it doesn't matter a
whole lot what frequency my receiver's tuned to.

On the other hand, I'm sure that if I ever get around to lashing things
up so that I could transmit, things wouldn't be so forgiving.

I haven't yet done any real research into digital modes; is there a good
(preferably online) resource, particularly something that would tell me
what the correct audio offset from the carrier is for the various modes?

The only "correct" audio offset is to keep it inside the band.

Most programs have a panoramic window, which if set up properly, will show
your actual receive frequency with audio offset and your transmit frequency.

See this one, for example:

http://www.dxlabsuite.com/winwarbler/

--
Jim Pennino

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