VEHICLE ANTITHEFT DEVICE Russian patent published in 1995 - IPC

FIELD: transport; antitheft facilities. SUBSTANCE: device has current-limiting resistor 2, remote controlled selector switch 3 with two opposite-phase windings 4 and 5, light-emitting diode 6, hermetically sealed reed relay 7, intermittent signal generator 9, electromagnetic relay 10, driving generator 11, phase manipulator 12, transmitter 13 with antenna 14, three receiving antennas, search unit, heterodyne oscillators mixers, first and second intermediate frequency amplifiers, detector, spectrum width meters, frequency doubler, comparator unit, threshold unit, delay line, switches, frequency meter, recording units, frequency detector, flip-flop, multipliers, narrow-band filters and phase detectors. Device enhances reliability and enlarges operating capabilities by transmitting alarm signals by radio to receiving station and accurate and well-defined direction finding of hi-jacked vehicle. EFFECT: enhanced reliability and enlarged operating capabilities. 4 dwg