1.

What is the frequency of interrogation pulse in secondary radar?(a) 1020 MHz(b) 1300 MHz(c) 1030 MHz(d) 1500 MHz

Answer» Right option is (c) 1030 MHz

Explanation: The interrogation pulse is transmitted at 1030 MHz and the reply pulse by the aircraft transponder is given at 1090 MHz. Since the reply is coded information, it does not interfere with other transponders that are using the same frequency.


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