Deviation
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The word deviation means an act of deviating, or the amount by which something has deviated, or the (real or metaphorical) route followed by a deviation.
- In radio, frequency deviation is the result of frequency modulation. In the FM band for broadcasting, deviation is normally 150kHz total, which is ±75kHz of the carrier frequency. Excessive deviation is the result of overmodulation, and causes interference to adjacent channels.
- Phase modulation has the same net effect as FM, but phase deviation is measured in degrees or radians, compared to the unmodulated carrier wave. The modulation index is equal to the phase deviation in radians.
- In Communism, a deviation or deviationism is an expressed belief which is not in accordance with official party doctrine for the time and area.
- See also Ffestiniog Railway.