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Question 192

What is the term for the suppression in an FM receiver of one signal by another stronger signal on the same frequency?

  1. Desensitization
  2. Cross-modulation interference
  3. Capture effectBonne réponse
  4. Frequency discrimination

Explication

An FM demodulator responds to instantaneous frequency rather than amplitude, so the stronger of two signals on the same frequency dominates the limiter and detector and the weaker one is suppressed almost entirely. This is the capture effect, distinct from receiver gain compression caused by a strong signal on a different frequency.

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Question 192: What is the term for the suppression in an FM receiver of… · FCC Amateur Extra Class (Element 4) · Questena