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Which of the following are the two main characteristics of receivers?

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Which of the following are the two main characteristics of receivers?

(a) Selectivity and sensitivity

(b) Gain and attenuation

(c) Modulation and demodulation

(d) Multiplexing and demultiplexing

The question was asked in an interview.

Query is from Communication Receivers in chapter Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics

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Correct choice is (a) Selectivity and sensitivity

For explanation: A communication receiver must be able to identify and select the desired signal from thousands of others present in the frequency spectrum (selectivity) and to provide sufficient amplification to recover the modulating signal (sensitivity). A receiver with good selectivity will isolate the desired signal in the RF spectrum and eliminate or at least greatly attenuate all other signals.

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