listed Wheeler's AVC among twelve "classic circuits" fundamental to the commercialization of radio and television.

Properly implemented automatic gain control (AGC) preserves the linearity of an AM receiver. In normal operation the RF and IF stages operate in their linear regions, so the detected audio waveform remains proportional to the modulation envelope of the carrier. AGC adjusts overall gain in response to changes in average carrier strength; it does not intentionally modify the instantaneous modulation waveform.

To prevent

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