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What is the reflected pulse in primary radar called?

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What is the reflected pulse in primary radar called?

(a) Reply

(b) Return

(c) Echo

(d) Radio reply

This question was addressed to me in an online quiz.

The query is from Primary and Secondary Radar in portion Surveillance Systems, Mapping and Multimode Radars of Avionics

1 Answer

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Right answer is (c) Echo

Explanation: The reflected or backscattered radio energy that reaches the radar antenna is called an echo. In secondary radar it is called a reply since the transponder replies for the interrogation signal.

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