Question

What type of receivers converts all incoming frequency into a lower frequency for better selectivity and sensitivity?

(a) Analogous receivers

(b) Superheterodyne receivers

(c) Digital receiver

(d) Crystal receiver

This question was addressed to me in an interview for internship.

My question is based upon Communication Receivers topic in chapter Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics

Answer 1

Right option is (b) Superheterodyne receivers

The explanation is: Superheterodyne receivers convert all incoming signals to a lower frequency, known as the intermediate frequency (IF), at which a single set of amplifiers and filters is used to provide a fixed level of sensitivity and selectivity. Most of the gain and selectivity in a superheterodyne receiver are obtained in the IF amplifiers.