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What is the two basic specifications of a receiver?

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What is the two basic specifications of a receiver?

(a) sensitivity and selectivity

(b) superious response and tracking

(c) signal and noise

(d) number of convertors and number of IFs

I had been asked this question in semester exam.

My question comes from Bandwidth of FM Signal with Arbitrary m(t) in chapter Angle Modulation of Analog Communications

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The correct answer is (a) sensitivity and selectivity

To elaborate: Sensitivity and selectivity are the two key specifications for any receiver, which is used for the purpose in communication. Sensitivity is the ability of the receiver to amplify weak signals, whereas Selectivity is the ability of the receiver to reject unwanted signals.

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