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9-6: Typical Receiver Circuits
Automatic Gain Control Circuits
Receiver gain is typically far greater than required for adequate reception. Excessive gain usually causes the received signal to be distorted and the transmitted information to be less intelligible.
Manual gain control can be achieved by using a potentiometer in RF and IF stages.
Receivers include volume controls in audio circuits.
AGC circuits are more effective in handling large signals and give the receiver a very wide dynamic range.