Note 1: Usually, the instantaneous frequency is shifted between two discrete values termed the "mark frequency[?]" and "space frequency[?]". This is a noncoherent form of FSK.
Note 2: Coherent forms of FSK exist in which there is no phase discontinuity in the output signal. Synonyms frequency-shift modulation, frequency-shift signaling.
Source: from Federal Standard 1037C and from MIL-STD-188
... in Maryland and Colorado
August 19, 1925 -- attends the Command and General Staff School[?], Ft. Leavenworth, Kansas[?]
June 18, 1926, graduates first in a class ...
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