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What is used to indicate that a baseline is not usable?(a) Blank(b) Blink(c) Pulse(d) Continuous waveI got this question in an online interview.This intriguing question comes from Hyperbolic Radio Systems in portion Terrestrial Radio Navigation System of Avionics

Answer»

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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