An AGC control monitors the fluctuations in DC voltages on the specific pilot channel, which relate to DBMV changes to the input level on the pilot channel. This in turn drives the Bode circuit which is basically a variable slope and gain control that makes adjustments to all channels across the band. From a simplistic view the AGC makes up for input changes to the amp that are caused by changes in temperature, as the input cable will in fact stretch (lengthen) or contract(shorten) with the effects of temperature. the rule of thumb is a 1% change in impedance for every 10 degrees F. change in temperature. So set it properly or you will find yourself outside the operating window of the control
> Does a typical AGC adjust levels by monitoring temperature around the module or input levels to the amplifier?