开云体育

With rigs like the NC-40A which have "single-signal" CW reception due to a
reasonably sharp IF filter, you can more or less tune for the strongest
signal and you'll be close. If you know the amount of shift it uses and can
tune for that value of pitch, that's a way to go. Exact zero beat might be
a little hard to achieve but you should be able to get within 100 Hz or so.

Come to think of it, I think the NC-40A's sidetone comes from monitoring
its own signal. So you should be able to press your key (clear frequency)
and sort of internalize in your mind the pitch you hear, then tune in the
station you plan to call until the pitch matches what you heard.

73-

Nick, WA5BDU