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What is the time gap between each pulse in an interrogation pulse pair for a DME?

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What is the time gap between each pulse in an interrogation pulse pair for a DME?

(a) 12μsec

(b) 5μsec

(c) 15μsec

(d) 10μsec

I got this question in unit test.

Origin of the question is Point Source Radio Systems in division Terrestrial Radio Navigation System of Avionics

1 Answer

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Right answer is (a) 12μsec

Easy explanation: The interrogation pulses are in pairs. Each pulse is placed 12μsec apart with each pulse lasting 3.5μsec. The pulse pair repetition rate ranges between 5 pulse pairs per sec to a maximum of 150 pulse pairs per sec.

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