Circuit arrangement for pilot level control for data transmission systems, in particular carrier-frequency long-distance traffic systems

摘要

The invention eliminates interfering beat frequency in the vicinity of the clock frequency and improves the control dynamic range for pilot controllers. The control parameter is provided by the remote feed current for a thermistor in each intermediate amplifier. The invention provides for a wobble of the previously fixed clock frequency, a separate evaluation of the pilot voltage and an evaluation of the difference between or the sum of the pilot voltage and the amplitude change caused by the beat. In the case of an appropriate statement in the form of signals on an AND circuit, the control device executes corresponding control steps.