| abstract |
An integrated multiple-function communication system for highways, railroads and other applications, the system comprising a wideband coaxial trunk cable with associated amplifier/repeaters for long-distance point-to-point transmission of a plurality of carrier signals combined with inductivesignaling means including frequency converter/amplifiers each having an input physically coupled to the coaxial trunk cable and an output coupled to an inductive-signaling conductor, the latter disposed within the trunk-cable structure or electrically related thereto whereby a relatively uniform electromagnetic field of a desired strength is established along a highway or other service zone for inductive carrier communication with vehicles, roadside call boxes and other devices located in proximity to the cable which interconnects with a control or terminal point. |