Automatic gain control is used

Question

Question

This question was previously asked in

VSSC ISRO Technical Assistant Electronics 8 Feb 2015 Official Paper

To maintain the tuning correct
To reduce the volume of loud passages of music
To increase the amplification at high frequencies
To maintain the same volume of the output when stations of different strength are received

Answer 1

AGC (Automatic Gain Control):

Automatic gain control (AGC) works in FM radio transmitter/receiver that maintains Automatic controlling of weak and strong signals which is received by the radio receiver.
The automatic frequency control voltage of the FM transmitter VCO is DC voltage.
AGC maintains a constant level of the output signal based on the received signal nature, i.e. it maintains the same volume of the output when stations of different strengths are received.
AGC adjusts the gain of RF and IF amplifiers according to need.
AGC can handle problems like overloading and fading in the receiver.

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