Selective electronic signal receiving and actuating device

Claim 1

WITH RESPECT TO RAW NOISE, AN ELECTRONIC SELECTIVE SIGNAL RECEIVING DEVICE HAVING IN COMBINATION, A PICKUP COIL TUNED TO PICK UP AT A MAXIMUM SIGNAL STRENGTH A LOCKOUT SIGNAL FREQUENCY AND TO PICK UP AT A REDUCED SIGNAL STRENGTH AN OPERATING SIGNAL FREQUENCY, SIGNAL AMPLIFYING MEANS FORMING PARALLEL CIRCUITS, SAID CIRCUITS RESPECTIVELY COMPRISING, A FIRST AMPLIFYING STAGE COMPRISING A TRANSISTOR IN CONNECTION WITH A POTENTIOMETER FORMING A GROUNDED EMITTER TYPE OF AMPLIFIER BIASED FOR D.C. STABILITY AND BYPASSED FOR A.C. GAIN, A SECOND AMPLIFYING STAGE CONSISTING OF A TRANSISTOR HAVING A COLLECTOR LOAD COMPRISING A CAPACITOR AND AN INDUCTION COIL FORMING A LOW Q BROAD BAND CIRCUIT ADAPTED TO HAVE THE SIGNAL CHARACTERISTICS OF SAID PICKUP COIL, A THIRD AMPLIFYING STAGE CONSISTING OF A TRANSISTOR HAVING A COLLECTOR LOAD COMPRISING A PAIR OF SIMILAR LC CIRCUITS IN SERIES, SAID LC CIRCUITS EACH COMPRISING A CAPACITOR AND A PRIMARY COIL IN CONNECTION WITH A SECONDARY COIL, A CAPACITOR COUPLING SAID PICKUP COIL AND SAID FIRST AMPLIFIER STAGE AND CAPACITORS RESPECTIVELY COUPLING SAID AMPLIFIER STAGES, ONE OF SAID LC CIRCUITS BEING SHARPLY TUNED TO PASS SAID LOCKOUT SIGNAL FREQUENCY, THE OTHER OF SAID LC CIRCUITS BEING SHARPLY TUNED TO PASS SAID OPERATING SIGNAL FREQUENCY, SAID ONE OF SAID LC CIRCUITS BEING ADAPTED TO PASS SAID LOCKOUT SIGNAL FREQUENCY AT A VOLTAGE GREATER THAN THE VOLTAGE APPLIED TO SAID OPERATING SIGNAL FREQUENCY BY SAID OTHER OF SAID LC CIRCUITS, A TRANSISTOR HAVING A BASE ADAPTED TO BE BIASED TO BE NON-CONDUCTIVE BY A POSITIVE VOLTAGE, MEANS RECTIFYING SAID VOLTAGES ACROSS SAID SECONDARY COILS, THE VOLTAGE FROM SAID SECONDARY COIL OF SAID ONE OF SAID LC CIRCUITS BEING ADAPTED TO FLOW IN A POSITIVE DIRECTION THROUGH A CIRCUIT PATH INCLUDING SAID LAST MENTIONED TRANSISTOR AND APPLYING A POSITIVE VOLTAGE TO THE BASE THEREOF, THE VOLTAGE FROM SAID SECONDARY COIL IN CONNECTION WITH SAID OTHER LC CIRCUIT BEING ADAPTED TO FLOW IN A NEGATIVE DIRECTION THROUGH A CIRCUIT PATH INCLUDING SAID LAST MENTIONED TRANSISTOR APPLYING A NEGATIVE VOLTAGE TO THE BASE THEREOF, AND SAID CIRCUIT PATHS RESPECTIVELY COMPRISING CAPACITORS AND RESISTORS IN CONNECTION WITH SAID LAST MENTIONED TRANSISTOR.