JEE PHYSICS MCQ: COMMUNICATION SYSTEMS

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In an FM system a 7 kHz signal modulate 108 MHz carrier so that frequency deviation is 50 kHz. The carrier swing is

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Correct option: A

7.143

Option A (7.143) is incorrect. The carrier swing is twice the frequency deviation, so it should be 2*50kHz = 100kHz. The question asks for the carrier swing, not the ratio of frequency deviation to modulation frequency. The correct answer should be 100kHz.

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