frequency-shift keying (FSK): A modulating scheme in which the modulating
signal shifts the output frequency between predetermined values. Usually,
the instantaneous frequency is shifted between two discrete values termed
the "mark" and "space" frequencies.

Used to transmit digital data, i.e. two different carrier frequencies are
used to represent zero and one.
FSK was originally used to transmit teleprinter messages by radio (RTTY) but
can be used for most other types of radio and land-line digital telegraphy

Although this a form of frequency modulation (FM),
FM is usually thought of as a voice signal that modulates the carrier.

--
CL -- I doubt, therefore I might be !






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is it cw i guess new to radio