Moving object detection system

Claim 1

IN AN ELECTROMAGNETIC MOVING OBJECT DETECTION SYSTEM INCLUDING A SIGNAL GENERATOR, AN ANTENNA FOR SIMULTANEOUS TRANSMISSION AND RECEPTION OF RADIO FREQUENCY ENERGY, AND A DETECTOR WHOSE OUTPUT IS AMPLIFIED BY AN AMPLIFIER TO ACTIVATE AN ALARM DEVICE IN RESPONSE TO THE PRESENCE OF A MOVING OBJECT; A RADIO FREQUENCY SIGNAL GENERATOR COMPRISING: AN ELECTRICALLY SHIELDING BASE; A FIRST ELECTRICALLY INSULATING RIGID MOUNTING BOARD SECURED NORMAL TO SAID BASE; A SECOND ELECTRICALLY INSULATING RIGID MOUNTING BOARD SECURED NORMAL TO SAID BASE AND PARALLEL TO SAID FIRST MOUNTING BOARD; A U-SHAPED LINK COUPLING INDUCTOR HAVING PARALLEL END PORTIONS AND A CURVED INTERMEDIATE PORTION, SAID END PORTIONS BEING SECURED TO SAID FIRST MOUNTING BOARD SO THAT THE PLANE OF SAID COUPLING INDUCTOR IS NORMAL TO THE PLANE OF SAID MOUNTING BOARD; A U-SHAPED PLATE INDUCTOR HAVING PARALLEL END PORTIONS AND A CURVED INTERMEDIATE PORTION, SAID CURVED AND PARALLEL PORTIONS BEING SECURED TO SAID FIRST AND SECOND MOUNTING BOARDS, RESPECTIVELY, SO THAT THE PLANE OF SAID INDUCTOR IS NORMAL TO THE PLANES OF SAID MOUNTING BOARDS AND PARALLEL TO AND SUPERPOSED ON THE PLANE OF SAID COUPLING INDUCTOR; AN ELECTRON TUBE MOUNTED ON SAID SECOND RIGID BOARD INTERMEDIATE OF SAID FIRST AND SECOND BOARDS WITH THE LONGITUDINAL AXIS OF SAID TUBE PARALLEL TO THE END PORTIONS OF SAID PLATE AND COUPLING INDUCTORS; ELECTRICAL MEANS FOR PRODUCING OSCILLTIONS IN SAID ELECTRON TUBE; AND AN ELECTRICALLY INSULATING RIGID MEMBER DISPOSED PARALLEL TO AND INTERMEDIATE OF SAID FIRST AND SECOND MOUNTING BOARDS HAVING MEANS FOR MAINTAINING COUPLING INDUCTOR, PLATE INDUCTOR AND ELECTRON TUBE IN PARALLEL SUPERPOSED RELATION WHEREBY THE FREQUENCY STABILITY OF THE ELECTRON TUBE OSCILLATOR IS MADE RELATIVELY INSENSITIVE TO MECHANICAL DISTURBANCES.