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Which quantity must exceed a threshold for FM's advantage to appear?

  • A.Carrier-to-noise ratio at the detector
  • B.Modulation index at the transmitter
  • C.Audio level at the modulator input
  • D.Deviation ratio of the system as designed

Answer: A

The carrier-to-noise ratio at the detector must be high enough, typically some ten decibels, before the improvement materialises. The index sets how large the improvement is once the threshold is passed, but it cannot substitute for signal. Audio level and deviation ratio are transmitter parameters. Separating the condition for a gain from the magnitude of that gain is the key to reading any statement about FM performance. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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