Surely this is not correct. There is no conventional way of
doing RTTY on AM or FM.

The distinction between FSK and AFSK is that the former
operates directly on the transmitter's frequency-determining
oscillator, while the latter works first through the audio
stages of an SSB rig to achieve the same on-the-air signals.

Chuck

Ralph Mowery wrote:
"'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.