FM Broadcast Radio Frequency Deviation

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The FM broadcasting range, which in the United States is between 87.5 and 108 MHz, uses a typical channel which spans from 100 kHz to 200 kHz, with a maximum frequency deviation of 75 kHz. This deviation of 75kHz can be both negative as well as positive.

  • +/- 75kHz (Maximum Deviation)

The most basic FM broadcast transmission has the carrier present at 30 Hz, and the modulating frequency is 5 Hz. With a modulation index of 3 the peak frequency deviation about 15 Hz suggesting that the frequency will vary between 15 and 45 Hz.

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