PHASE-SENSITIVE TRACK RECEIVER Russian patent published in 1997 - IPC

FIELD: railway transport; railway signalling; traffic control systems to receive information on occupancy of station track circuits. SUBSTANCE: phase sensitive track receiver has local and track transformers 1 and 2, resistor 3, filter 4, switch 5 connected in parallel both to secondary winding of track transformer 1 through resistor 3 and to filter 4 through first secondary winding of local transformer. Third secondary winding 2.4 is connected to inputs of second and third ac switches 7 and 8, their second leads being connected with two series-connected integrators 9, 10 and 11, 12 all outputs of which are connected, respectively, with one of four inputs of coincidence unit 13. Coincidence unit 13 can be made in form of ac generator and multistage amplifier with separate supply. EFFECT: improved reliability of operation. 2 cl, 1 dwg