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The jammer which monitors a communicator’s signal is known as

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The jammer which monitors a communicator’s signal is known as

(a) Frequency follower jammers

(b) Repeat back jammers

(c) Frequency follower & Repeat back jammers

(d) None of the mentioned

I had been asked this question in an interview for internship.

This intriguing question originated from Pseudo-Noise Sequence and Jamming in portion Spread Spectrum Techniques of Digital Communications

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Right option is (c) Frequency follower & Repeat back jammers

The best I can explain: The smart jammers which monitor a communicator’s signals is known as frequency follower or repeat back jammers.

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