Search receiver which corrects for motor overshoot by interchange of two offset bandpass filters

Claim 1

A SIGNAL SEEKING RECEIVER COMPRISING TUNABLE INPUT CIRCUIT MEANS FOR RECEIVING INCOMING SIGNALS, VARIABLE TUNING MEANS FOR TUNING SAID INPUT CIRCUIT MEANS, ELECTROMECHANICAL MEANS FOR EFFECTING VARIATION OF SAID TUNING MEANS, SAID ELECTROMECHANICAL MEANS BEING SUBJECT TO OVERSHOOT OWING TO INERTIA WHEREBY SAID TUNING MEANS CONTINUES TO BE VARIED FOR A PREDETERMINED PERIOD FOLLOWING DEENERGIZATION OF SAID ELECTROMECHANICAL MEANS, DETECTING MEANS FOR DETECTING SAID INCOMING SIGNALS AND FOR DERIVING AN OUTPUT CONTROL VOLTAGE WHEN SAID INCOMING SIGNAL HAS A PREDETERMINED DESIRED CHARACTER, FREQUENCY SENSITIVE TRANSMISSION MEANS FOR PASSING A RELATIVELY NARROW BAND OF FREQUENCIES OVER A FIRST REGION OF THE FREQUENCY SPECTRUM, A SIGNAL CHANNEL INCLUDING SAID INPUT CIRCUIT MEANS, SAID TRANSMISSION MEANS AND SAID DETECTING MEANS IN THE ORDER NAMED, CONTROL MEANS ACTUATED BY SAID DETECTOR OUTPUT CONTROL VOLTAGE ONLY DURING RECEPTION AND DETECTION OF SAID DESIRED SIGNAL FOR SHIFTING THE PASSBAND OF SAID TRANSMISSION MEANS TO A DIFFERENT REGION OF THE FREQUENCY SPECTRUM DURING AND AFTER SAID PREDETERMINED PERIOD.