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An AM radio station operating at 630 kHz is permitted to broadcast audio frequencies up to 6 kHz. The band pass filter in its modulation circuit can retain the frequenciesA. 636 kHz , 630 kHzB. 12 kHz, 6kHzC. 1260 kHz, 6kHzD. 1260 kHz, 630 kHz |
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Answer» Correct Answer - A The band pass filter retains the frequencies `v_(c),v_(c)-v_(m)` and `v_(c) + v_(m)` and rejects the frequencies `v_(m),2V_(m)` and `2v_(c)` Here `v_(c) = 630 kHz, v_(m) = 6 kHz` `therefore ` The frequencies retained by the band pass filter are `v_(c) = 630 kHz` `v_(c) - v_(m) = (630-6) kHz = 624kHz` `v_(c)+ v_(m) = (630 + 6) kHz = 636 kHz` |
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