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  • The transmission and reception of communi cation signals that consist of electromagnetic waves that travel through the air. Radio waves may travel either in a straight line or by reflection off the ionosphere or a communications satellite. Radio waves may be classified according to their physical length or by the number of cycles that they complete in a given time period. For radio transmission, audio data are imparted to a carrier wave by varying its amplitude, frequency, or duration by a process called modulation. AM (amplitude modulation) radio involves “side-band” frequencies at the upper and lower ends of a carrier wave, which register variations in the strength of the wave. FM (frequency modulation) radio involves the variation of the number of cycles through which ...

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