What is the term for the suppression in an FM receiver of one signal by another stronger signal on the same frequency?
The correct answer is C: Capture effect. What is the term for the suppression in an FM receiver of one signal by another stronger signal on the same frequency is capture effect. FM receivers capture the stronger signal and suppress the weaker one. For amateur radio operators, this is important for FM operation. Understanding this helps when operating FM.
Exam Tip
FM suppression of weaker signal = capture effect. Think 'C'apture 'E'ffect = 'C'aptures 'E'stronger signal. FM receivers capture the stronger signal and suppress the weaker one. Not desensitization, not cross-modulation, not frequency discrimination - just capture effect.
Memory Aid
"FM suppression of weaker signal = capture effect. Think 'C'apture 'E'ffect = 'S'tronger 'S'ignal wins. FM receivers capture the stronger signal and suppress the weaker one. Important for FM operation."
Real-World Application
In an FM receiver: When two signals are on the same frequency, the stronger signal suppresses (captures) the weaker one. This is called the capture effect. The receiver locks onto the stronger signal and ignores the weaker one. This is the term - capture effect.
Key Concepts
Why Other Options Are Wrong
Option A (Desensitization): Incorrect. Desensitization is reduction in receiver sensitivity, not suppression of weaker signal - capture effect is suppression. Desensitization isn't the term.
Option B (Cross-modulation interference): Incorrect. Cross-modulation is modulation transfer, not suppression of weaker signal - capture effect is suppression. Cross-modulation isn't the term.
Option D (Frequency discrimination): Incorrect. Frequency discrimination isn't the term - capture effect is suppression of weaker signal. Frequency discrimination isn't the term.
题目解析
The correct answer is C: Capture effect. What is the term for the suppression in an FM receiver of one signal by another stronger signal on the same frequency is capture effect. FM receivers capture the stronger signal and suppress the weaker one. For amateur radio operators, this is important for FM operation. Understanding this helps when operating FM.
考试技巧
FM suppression of weaker signal = capture effect. Think 'C'apture 'E'ffect = 'C'aptures 'E'stronger signal. FM receivers capture the stronger signal and suppress the weaker one. Not desensitization, not cross-modulation, not frequency discrimination - just capture effect.
记忆口诀
FM suppression of weaker signal = capture effect. Think 'C'apture 'E'ffect = 'S'tronger 'S'ignal wins. FM receivers capture the stronger signal and suppress the weaker one. Important for FM operation.
实际应用示例
In an FM receiver: When two signals are on the same frequency, the stronger signal suppresses (captures) the weaker one. This is called the capture effect. The receiver locks onto the stronger signal and ignores the weaker one. This is the term - capture effect.
错误选项分析
Option A (Desensitization): Incorrect. Desensitization is reduction in receiver sensitivity, not suppression of weaker signal - capture effect is suppression. Desensitization isn't the term. Option B (Cross-modulation interference): Incorrect. Cross-modulation is modulation transfer, not suppression of weaker signal - capture effect is suppression. Cross-modulation isn't the term. Option D (Frequency discrimination): Incorrect. Frequency discrimination isn't the term - capture effect is suppression of weaker signal. Frequency discrimination isn't the term.
知识点
FM receiver, Suppression of one signal, Stronger signal on same frequency, Capture effect
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.