IGNITION INTERFERENCE AUTOALARM SYSTEM.
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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A device called the Ignition Interference Autoalarm System is described. The system, intended for installation at the entrances of sensitive areas, is designed to detect electromagnetic interference above a predetermined level within a given radius, and to automatically give an optional visible or audible signal. Essentially, the system consists of a control unit, broadband antennas, and assocaited multicouplers. The control unit consists of a series of high-gain, fixed-frequency, broadband, transistorized amplifiers, all operating in parallel and feeding one trigger circuit. There are 12 channels, each possessing an antenna input, a variable gain control, and a conventional diode detector circuit. The detector outputs are connected in parallel, and each may trigger the alarm unit independently of the others. The alarm indication is a light signal or bell, whichever the operator chooses. Author