Control arrangement for preventing improper regulation of an intermediate amplifier station

Claim 1

A CONTROL ARRANGEMENT FOR CARRIER-FREQUENCY OPERATED TRANSMISSION SYSTEMS INCLUDING A TRANSMITTER STATION AND AT LEAST ONE PILOT FREQUENCY CONTROLLED AND REGULATED INTERMEDIATE AMPLIFIER STATION, FOR PREVENTING IMPROPER REGULATION OF SAID INTERMEDIATE AMPLIFIER STATION, COMPRISING, IN COMBINATION, INPUT MEANS FOR INTRODUCING A CARRIER-FREQUENCY MODULATED BY A SIGNAL FREQUENCY BAND WITH AT LEAST ONE PREDETERMINED NARROW FREQUENCY RANGE WITHIN SAID BAND LEFT UNUSED FOR MODULATION; A TRANSMISSION LINE EMANATING FROM SAID INPUT MEANS; MEANS FOR FURNISHING A PILOT SIGNAL OF A FREQUENCY LOCATED WITHIN SAID PREDETERMINED NARROW FREQUENCY RANGE; COUPLING MEANS ARRANGED AT THE STARTING END OF SAID TRANSMISSION LINE FOR APPLYING SAID PILOT SIGNAL TO SAID CARRIERFREQUENCY; CONTROL MEANS ACTUATABLE FOR PREVENTING, WHEN ACTUATED, THE TRANSMISSION OF A SIGNAL AT A FREQUENCY LOCATED WITHIN SAID PREDETERMINED NARROW FREQUENCY RANGE; MONITORING MEANS CONNECTED TO A JUNCTION POINT BETWEEN SAID INPUT MEANS AND SAID COUPLING MEANS FOR MONITORING SAID SIGNAL MODULATED CARRIER-FREQUENCY AND FOR ACTUATING SAID CONTROL MEANS AS LONG AS AT SAID JUNCTION POINT A SIGNAL COMPONENT APPEARS WHICH HAS A FREQUENCY LOCATED WITHIN SAID PREDETERMINED NARROW FREQUENCY RANGE; AND AT LEAST ONE INTERMEDIATE AMPLIFIER STATION ARRANGED WITHIN SAID TRANSMISSION LINE FOR RECEIVING AND RELAYING SAID SIGNAL MODULATED CARRIER-FREQUENCY AND INCLUDING PILOT SIGNAL RECEIVER MEANS RESPONDING ONLY TO FREQUENCIES LOCATED WITHIN SAID PREDETERMINED NARROW FREQUENCY RANGE AND REGULATOR MEANS CONTROLLED BY SAID PILOT SIGNAL AS RECEIVED BY SAID RECEIVER MEANS, FOR REGULATING THE OPERATION OF SAID INTERMEDIATE AMPLIFIER STATION.