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The conventional 30 Hz reference signal is frequency modulated on a __________ sub carrier.

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The conventional 30 Hz reference signal is frequency modulated on a __________ sub carrier.

(a) 96 Hz

(b) 99,960 Hz

(c) 960 Hz

(d) 9,960 Hz

This question was posed to me in a job interview.

The origin of the question is Aviation Communication Systems topic in chapter Aviation Communication Systems of Aircraft Maintenance

1 Answer

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Correct choice is (d) 9,960 Hz

Easiest explanation: The conventional 30 Hz reference signal is frequency modulated on a 9,960 Hz sub carrier.  The omnidirectional signal usually contains an amplitude modulated voice channel.

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