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Communication SystemsFrequency Modulation

For an FM wave, if frequency deviation is doubled while modulating frequency remains unchanged, the FM modulation index becomes?

  • AHalf
  • BUnchanged
  • CDouble
  • DFour times
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Correct Answer: C. Double
Explanation: FM modulation index beta=Delta f/fm. Doubling Delta f with fm fixed doubles beta.
Reference: Standard communication systems: FM modulation index
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