Functions of radio receiver & frequency mixer in super heterodyne receiver

The functions of radio receiver are

Options:

a) Receive the Incoming modulated carrier by antenna
b) Select the wanted signal and reject the unwanted signals and noise
c) Detection and amplification of the information signal from the carrier
d) All of the above

Correct Answer: d.) All of the above

Explanation:

The radio receivers receive the incoming modulated carrier by the receiving antennas. Then they select the wanted signal from the carrier and reject the unwanted signals and noise. The received signal is then amplified by the RF amplifiers. Detection of the information signal is done from the received carrier and the information or the modulating signal is then filtered and amplified.

Function of frequency mixer in super heterodyne receiver is

Options:

a) Amplification
b) Filtering
c) Multiplication of incoming signal and the locally generated carrier
d) None of the above

Correct Answer: c.) Multiplication of incoming signal and the locally generated carrier

Explanation:

The function of a frequency mixer in a super heterodyne receiver is that it mixes or multiplies the incoming modulated carrier with the locally generated carrier. It then produces a number of frequencies. The produced frequencies are either the sum or the differences of the frequencies of the received signals. The output of the mixer is used to detect the modulating or information signal from the received modulated carrier.