Antenna apparatus for vehicle track rail signals

Details Antenna apparatus for vehicle track rail signals Antenna apparatus for vehicle track rail signals

1974-10-17

1976-04-13

Blix, Trygve M.

Railway switches and signals

Block-signal systems

Automatic

246 34R, B61L 2108

Patent

active

039499596

ABSTRACT:
An antenna apparatus is disclosed for coupling audio frequency signals in relation to one or more vehicle track rails of a transit system for the purpose of determining vehicle occupancy of a given signal block and providing speed coded control signals to a vehicle moving along the track rail in that given signal block. It is desired that each signal block in the transit system track circuit operate with the signal level above a predetermined minimum signal level for reasons of vehicle occupational detection. The antenna apparatus is operative to enable desired adjustment of the signal level in a given signal block and in adjacent signal blocks relative to that given signal block.

REFERENCES:
patent: 3582644 (1971-06-01), Schatzel
patent: 3794833 (1974-02-01), Blazek
patent: 3821544 (1974-06-01), Matty

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