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Automatic gain control for recirculating loop spectrum analyzer

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1. AN AUTOMATIC GAIN CONTROL CIRCUIT FOR A SPECTRUM ANALYZER COMPRISING: GENERATING MEANS FOR GENERATING A CONTROL SIGNAL HAVING AN AMPLITUDE GREATER THAN THE AMPLITUDES OF FREQUENCY COMPONENTS IN A SIGNAL TO BE ANALYZED; A SIGNAL CIRCULATING LOOP INCLUDING IN SERIES RELATIONSHIP A RELAY LINE ELEMENT, A HETERODYNING CIRCUIT, A VARIABLE GAIN AMPLIFIER, AND SUMMING CIRCUIT MEANS FOR COMBINING THE SIGNAL TO BE ANALYZED AND SAID CONTROL SIGNAL WITH SIGNALS CIRCULATING IN SAID LOOP, SAID GENERATING MEANS CONNECTED TO SAID SUMMING CIRCUIT MEANS FOR INJECTING SAID CONTROL SIGNAL INTO SAID CIRCULATING LOOP; GATING MEANS CONNECTED TO SAID LOOP FOR PASSING SIGNALS CIRCULATING IN SAID LOOP EXCEEDING A PREDETERMINED THRESHOLD; AND AMPLIFIER CONTROL MEANS RESPONSIVE TO CHANGES IN THE SIGNALS PASSING THROUGH SAID GATING MEANS FOR CORRECTING THE GAIN OF AMPLIFIER IN A MANNER INVERSE TO THE CHANGE OF SAID SIGNALS PASSING THROUGH SAID GATE.
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