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Question 492

What is considered an acceptable maximum IMD level for an idling PSK signal?

  1. +5 dB
  2. +10 dB
  3. +15 dB
  4. -30 dBCorrect answer

Explanation

IMD is quoted relative to the wanted signal, so a clean transmitter shows its distortion products well below it, and an idling PSK signal should measure −30 dB or better. Positive figures would mean the distortion products were stronger than the signal itself, which no working transmitter produces.

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Question 492: What is considered an acceptable maximum IMD level for an… · FCC Amateur Extra Class (Element 4) · Questena