AUDIO FREQUENCY ELECTRICAL JOINT APPARATUS WITH FUNCTION OF A LARGE SENSING AREA AND TUNER BOX

摘要

A railroad track circuit apparatus having a rail section magnifying detection function and a tuner box of the same are provided to grasp correctly an occupied position of a train by preventing presence of a dead section on a rail circuit. A branch line track rail is installed at a diverging point of a straight track circuit. An electrical connection part using a jump line is formed between both rails of the branch line track rail. A physical insulating material is formed between both ends of the electrical connection part. A plurality of reception tuning units(tu1,tu2') are connected to both rails at a position apart from the electrical connection part. A first and second receivers(rx1,rx2') are connected to the reception tuning units. A plurality of track relays(R/L,R/L2') are connected to the first and second receivers. A detection unit is connected to a power supply unit(PSU). The detection unit detects an AF frequency through the jump line from a transmitter and transmits detection information to the track rail. The reception tuning units, the first and second receivers, the track relays, and the power supply unit are mounted in a waterproof tuner box(102).