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How much is the difference between interrogation and reply frequencies?

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How much is the difference between interrogation and reply frequencies?

(a) 63 MHz

(b) 63 Hz

(c) 60 MHz

(d) 63 Hz

This question was posed to me during an online exam.

My question is based upon Aviation Communication Systems topic in chapter Aviation Communication Systems of Aircraft Maintenance

1 Answer

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Correct option is (a) 63 MHz

To explain I would say: The difference between a pair of interrogation and reply frequencies is of the magnitude of 63 MHz. Also the band comprises of 126 channels solely for interrogation purpose and another 126 channels for reply purposes.

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