FIELD: railway transport; traffic control systems. SUBSTANCE: device has harmonic signal source coupled through matching element with track circuit input and through communication line with one of inputs of phase angle meter. Other input of this unit is connected through other matching element to output of track circuit. Device has also threshold element whose input is coupled with output of track circuit, signal level metering unit, dynamic range narrowing unit and signal level regulator. EFFECT: improved reliability of control. 1 dwg
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