Question

Selectivity measures ________

(a) the range of frequencies that receiver can select

(b) with two signals close in frequency, the ability to select one and reject other

(c) how well adjacent frequencies are separated by the demodulator

(d) how well adjacent frequencies are separated in the mixer

This question was posed to me in an international level competition.

Question is from Multitone Wideband FM in portion Angle Modulation of Analog Communications

Answer 1

Right answer is (a) the range of frequencies that receiver can select

Easy explanation: Sensitivity and Selectivity are two key components of any circuit. Selectivity is used to measure the range of frequencies that the receiver can select. Sensitivity is the ability of the receiver to amplify weak signals.