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Communication SystemsFrequency Modulation

Using Carson’s rule, the approximate bandwidth of an FM signal with peak deviation 75 kHz and maximum modulating frequency 15 kHz is?

  • A90 kHz
  • B150 kHz
  • C180 kHz
  • D300 kHz
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Correct Answer: C. 180 kHz
Explanation: Carson's rule gives B≈2(Delta f+fm)=2(75+15)=180 kHz.
Reference: Standard communication systems: frequency modulation
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