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What is the time separation for P1 and P3 for mode A secondary radar?

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What is the time separation for P1 and P3 for mode A secondary radar?

(a) 8 μs

(b) 21 μs

(c) 6 μs

(d) 4 μs

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The above asked question is from Primary and Secondary Radar topic in portion Surveillance Systems, Mapping and Multimode Radars of Avionics

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Right choice is (a) 8 μs

Easy explanation: The time delay between P1 and P3 determines the type of interrogation. When the Time lag is 8μs, it corresponds to mode A whereas a separation of 21 μs corresponds to mode C.

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