Many RTTY demodulators such as MMTTY can be configured to change the audio
pitch, or tones, to zero-beat a signal within the IF passband of the radio.
In MMTTY the function is called AFC (Automatic Frequency Control). This
works fine if your transmit frequency is locked, e.g., if you are CQing on
one frequency and responding to callers. But, if you are tuning the band
with AFC enabled you will likely be transmitting off-frequency unless you
disable AFC or enable NET which is a second function in MMTTY that also
moves your transmit audio tones to match your received tones. This, of
course, only works with AFSK transmission which is one of the advantages of
using AFSK instead of FSK.
Ed W0YK
Lee N0SQ wrote:
> Is there software available that can auto-tune a transceiver
> to match a contact that's slightly off freq?
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