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Communication SystemsAmplitude Modulation

In conventional AM with a single-tone message, the maximum transmission efficiency at 100% modulation is approximately?

  • A25%
  • B33.3%
  • C50%
  • D66.7%
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Correct Answer: B. 33.3%
Explanation: At m=1, total sideband power is Pc/2 and total transmitted power is 1.5Pc, so efficiency=(0.5Pc)/(1.5Pc)=1/3≈33.3%.
Reference: Standard communication systems: AM efficiency
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