"'Doc" wrote in message
om...
Ralph,
Works in SSB too...
'Doc

Doc, you must not have understood what I sent. When a ssb transmitter is
fed audio tones in to the mic input for digital modes such as rtty you are
not using AFSK but FSK. It is AM or FM modes that feeding into the mic
input that you generate AFSK.

YOu do not normally generate AFSK by feeding audio into the mic input of a
SSB transmitter, you generate FSK. If a single audio tone is fed into a ssb
transmitter you get a single frequency output. If it is changed in
frequency you get another single frequency output. This is FSK even though
you are using audio into the mic input.

If you feed a single tone into the mic of an AM transmitter , you get a
carrier on the frequency and two sidebands (upper and lower) of the
frequency of the tone. This is AFSK.