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سؤال 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 effectپاسخ درست
  4. Frequency discrimination

توضیح

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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