RF Loop Intruder Detection System.
DEPARTMENT OF THE AIR FORCE WASHINGTON D C
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An RF intruder system utilizes two concentric loops of wire spaced apart for a predetermined magnitude, either of which can transmit andor receive electromagnetic energy. This area within the loops are to be protected against intrusion. Without intrusion, the received signal is steady. Upon intrusion, there are signal changes which are instantly noted by signal detection and processing. Author
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