VEHICLE ANTITHEFT DEVICE Russian patent published in 1995 - IPC

FIELD: transport electronics. SUBSTANCE: device has series-connected switch and decoupling unit, series-connected mode of operations unit, transmitter with antenna, receiver and alarm unit; mode of operations unit has series-connected flip-flop, clock-pulse generator and counter and initial setting unit, as well as demultiplexer, resistor matrix, single-shot multivibrator, check mode on button and AND circuit; alarm unit has inverters, flip-flop, clock-pulse generator, initial setting unit, acoustic converter and audio signal generator, pulse stretcher, delay circuit, sets of inverters and switching elements and shift register. Antenna of transmitter is made of wire (copper foil) and is located between glass and rubber weather strip of windshield and backlight glasses of vehicle. Device employs for its operation modulating coded sequence of N-pulses characteristic only of this device. EFFECT: enhanced antitheft protection. 2 cl, 4 dwg