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What is used to indicate that a baseline is not usable?

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What is used to indicate that a baseline is not usable?

(a) Blank

(b) Blink

(c) Pulse

(d) Continuous wave

I got this question in an online interview.

This intriguing question comes from Hyperbolic Radio Systems in portion Terrestrial Radio Navigation System of Avionics

1 Answer

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The correct answer is (b) Blink

The explanation is: The secondary stations blink to notify the user that a master secondary pair is unusable. Blink is repetitive on/off pattern of the first two pulses of the secondary signal.

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