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Frequency modulation

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Frequency modulation, or FM, 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")

FM Spectrum communications was one of a number of acceptable means of communications between the Federation and the Sheliak Corporate set down in the treaty of Armens in case something came up regarding the treaty. (TNG: "The Ensigns of Command", okudagram)

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