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Which parameter does the message amplitude control in FM?

  • A.Message frequency
  • B.Carrier amplitude
  • C.Occupied channel spacing
  • D.Deviation

Answer: D

Message amplitude sets the deviation, and hence the index and the bandwidth. It does not touch the message frequency, which is a property of the sound itself, nor the carrier amplitude, which stays constant throughout. Channel spacing is a regulatory allocation the transmitter must fit inside. This single mapping - amplitude to deviation, frequency to rate - is the first thing to fix in mind about angle modulation.

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