LEVEL CONTROL FOR A BROADBAND DISTRIBUTION SYSTEM

摘要

This invention provides a level control system for achieving a consistent desired signal level at each of the outlets (27) of a broadband signal distribution system where the outlets (27) are each subject to signals experiencing varying amounts of attenuation. The level control system has two subsystems (10, 80). The cable system level control subsystem (10) consists of a closed loop feedback circuit having an RF pilot detector (60) for detecting a pilot signal generated at the distribution unit (38), a level control circuit (62), and a pair of cable simulating attenuators (16, 19) which are controlled by the level control circuit (62). The modulator level control subsystem (80) consists of a pair of flat response attenuators (86, 88) connected in series and a closed loop feedback circuit consisting of a broadband RF detector (96) and a level control circuit (98) connected to the output of the broadband RF detector for driving both flat response attenuators (86, 88) whereby a desired signal level output is achieved on the system output (21).