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Revision as of 16:29, 12 February 2012
Frequency modulation was a method of radio communications, which involved slightly varying the frequency of the transmission being sent. This was different from amplitude modulation, which varied the strength of the signal.
FM radio transmissions were detected coming from the planet 892-IV in 2268 by Uhura on board the USS Enterprise. (TOS: "Bread and Circuses")