PURPOSE: To constitute a transmission line with less transmission loss without requiring the increase in the converting element and also to attain bi-directional communication by connecting a transmitter in series and in a loop at the interval of one transmitter.
CONSTITUTION: The transmitter 3 of a steel tower 1 is connected in series via converting elements 5, 6 at the interval of one transmitter in the 1st transmission line reaching a central device 4 of a substation 2, and each transmitter 3 other than the transmitter 3 connected to the 1st transmission line 7 is connected at the interval of one transmitter in the 2nd transmission line 8 from the central device 4 to the transmitter 3 and the 1st and 2nd transmission lines are connected at the transmitter 3 at the remotest end.
HIBAYASHI KOUICHI