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What are the maximum number of channels in an instrument landing system?

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What are the maximum number of channels in an instrument landing system?

(a) 900

(b) 90

(c) 40

(d) 400

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Question is taken from Aviation Communication Systems topic in chapter Aviation Communication Systems of Aircraft Maintenance

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Right option is (c) 40

The best explanation: There can be a maximum of 40 channels in an Instrument Landing System. The channels are alternatively modulated at 90 Hz and 150 Hz. Signals from these channels are transmitted by means of co-located antennas.

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