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Communication SystemsAngle Modulation

In frequency modulation, which parameter of the carrier is varied according to the message?

  • AAmplitude
  • BInstantaneous frequency
  • CAverage power only
  • DAntenna resistance
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Correct Answer: B. Instantaneous frequency
Explanation: FM varies the instantaneous carrier frequency according to the message while ideally keeping amplitude constant.
Reference: Standard communication systems: angle modulation
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