FIELD: railway transport; warning of team operating on tracks. SUBSTANCE: device has transmitter installed on vehicle. Transmitter has modulator made of series-connected multivibrator and switch stage, and class B resonance-tuned amplifier; decoupling unit and carrier frequency crystal controlled generator. Receiver has two series-connected resonance-tuned amplifiers, mixer, intermediate frequency amplifier, amplitude detector, complementing and noncomplementing low-frequency amplifiers, voltage level control unit and signalling unit made in form of sound signalling device with piezoelectric converter. EFFECT: enhanced reliability of operation. 5 dwg
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