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Frequency shift

In telecommunication, the term frequency shift has the following meanings:

Any change in frequency
Any change in the frequency of a radio transmitter or oscillator. (Note: In the radio regime, frequency shift is also called rf shift.)
Frequency-shift telegraphy[?]
In facsimile, a frequency modulation system where one frequency represents picture black and another frequency represents picture white[?]. Frequencies between these two limits may represent shades of gray
An intentional frequency change used for modulation purposes

Source: from Federal Standard 1037C and from MIL-STD-188

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