The Equalizer Remote-Control System

TL;DRAbstract

The equalizer remote-control system performs the role of a master control for the adjustable equalizers in the lines of an L-4 system. A control center located at an attended main station repeater may have jurisdiction over several hundred equalizers, some of which may be as distant as 300 miles. The required equalizer adjustments are determined from the relative powers of signals received from remotely controlled test oscillators at the equalizing locations. When necessary, the equalizers are remotely adjusted in discrete steps by means of commands sent out by the control center. Memory circuits associated with the equalizer networks maintain the network gain settings between adjustments. At each distant main station in a control system, a loop-back unit provides decoding and switching that control equalizers at the location and complete far-end looping paths to the lines to be equalized or checked. The looping paths pass the commands used to address the equalizing repeaters, which ar

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