Antenna apparatus for vehicle track rail signals
First Claim
1. In an antenna apparatus for providing a signal current in a track circuit including a plurality of signal blocks for the control of a vehicle operative with said track circuit, the combination offirst means operative with each of adjacent signal blocks for providing a first portion of said signal current in each of said adjacent signal blocks, andsecond means operative with each of said adjacent signal blocks for providing a second portion of said signal current in each of said adjacent signal blocks,with said first means being more efficient in relation to the provision of signal current in said adjacent signal blocks and said second means being operative to balance the respective signal current levels in said adjacent signal blocks.
1 Assignment
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Accused Products
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.
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Citations
6 Claims
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1. In an antenna apparatus for providing a signal current in a track circuit including a plurality of signal blocks for the control of a vehicle operative with said track circuit, the combination of
first means operative with each of adjacent signal blocks for providing a first portion of said signal current in each of said adjacent signal blocks, and second means operative with each of said adjacent signal blocks for providing a second portion of said signal current in each of said adjacent signal blocks, with said first means being more efficient in relation to the provision of signal current in said adjacent signal blocks and said second means being operative to balance the respective signal current levels in said adjacent signal blocks.
Specification