INTRUDER ALARM DEVICE Russian patent published in 2007 - IPC G08B13/24 

FIELD: guarding equipment, possible use for outfitting perimeters of various objects.

SUBSTANCE: device contains high frequency generator, controllable attenuator, modulator, synchronous detector, power amplifier, transmitting block, receiving block, high frequency amplifier, video impulse amplifier, first and second comparators, first and second memory blocks, reverse counter, first, second, third and fourth time relays, AND element, digital-analog converter, video impulse generator, and additionally contains comparison block, two keys, integrator, fifth time relay, spike detector and NOT element.

EFFECT: increased functional reliability of device.

1 dwg