SIGNAL TRANSMISSION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a means for confirming a present position by attaching and coupling a directional coupler, a loop antenna and the like for reception on a transmission line in a receiver which carries an electric field generated on the transmission line alone therewith.

SOLUTION: A high frequency signal interlocked to an output signal of a traffic signal is transmitted to a guide line, a directional coupler is attached and coupled to the guide line, and the high frequency signal is received by the directional coupler.

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