Innolinks,
There basically 3 ways to control the output of an RF amplifier. This due to the changes in loss in the coaxial cable due to the change in temperature. The colder it gets the less coaxial cable loosses about 1% per 10 degres F. of cahnges.
TLC; Thermal Level Control; This take care of the amp. output by checking the housing temperature. The housing get cold, basically the input level raised, then this unit by the output level to where it was set at. This system is basically right to about +/- 15%
AGC/ASC; Automatic Gain Control / Automatic Slope Control; This requires 2 pilots (usually TV signal) one in the low band section (works on the slope also call TILT) and one in the upper section (works on the gain) If the level at the input goes up, this AGC/ASC will bring the output level where it was set up. This system is about +/- 0.5 dB correct.
BODE CONTROL; This new system, only work on one pilot (usually a TV channel) usually work on 1 to 4 on a 750 MHz system, meaning if the BODE channel goes up by 1 dB, the highest channel on the system, around 750 MHz will be ajusted by 4 dB and the lowest channel around channel 2 or 3 will be adjusted by 1.0 dB
Hope this help....
