Schaltung zum Einsetzen von Fernsprechkanaelen in Zwischenfrequenz-Knoten fuer Relais-Radiostationen

摘要

A circuit arrangement for the insertion of additional communication channels such as telephone channels and the like in the intermediate frequency junctions of the relaying stations, wherein the intermediate frequency signal, coming from the receiver of the station, is applied to a first frequency converter associated to a first conversion oscillator, said first converter being coupled through a band pass filer to a second frequency converter associated to a second conversion oscillator, wherein at least one of said conversion oscillators can be modulated by the signals of the channels to be added, and at least one of the two conversion oscillators is controlled by the error signal coming from a phase detector piloted by the signal coming from a first and a second frequency divider respectively connected to the input to, and the output from the system.