FREQUENCY SHIFT

1. Any change in frequency . 2. Any change in the frequency of a radio transmitter or oscillator . ( 188 ) Note: In the radio regime, frequency shift is also called rf shift. 3. See frequency-shift telegraphy . 4. 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. ( 188 ) 5. An intentional frequency change used for modulation purposes. ( 188 )