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Communication SystemsAngle Modulation

For a sinusoidal message in phase modulation, increasing the message frequency while keeping message amplitude and phase sensitivity fixed causes the peak frequency deviation to?

  • ADecrease
  • BRemain zero
  • CIncrease
  • DRemain independent of frequency
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Correct Answer: C. Increase
Explanation: In PM, instantaneous frequency deviation is proportional to the time derivative of the message, so for a sinusoid its peak value increases with message frequency.
Reference: Standard communication systems: angle modulation
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