| 摘要 |
PURPOSE:To reduce the number of fixed stations and to increase the maintenanceability, by commonly using the leakage coaxial cable in a plural number of frequency bands and installing the fixed stations outside of tunnel, in the mobile communication in tunnels and the like. CONSTITUTION:The output signal of 150MHz band fixed station 18 is fed to the leakage coaxial cable 21a via the common unit 20a and is absorbed with the resistive terminator 23 via the coupler 22, leakage coaxial cable 21b and common unit 20b. On the other hand, the output signal of the 400MHz fixed station 19b if fed to the cable 21a, is terminated with the coupler 22, and the leakage output of the minimum reception level can be obtained even at the common unit side of the cable 21a. As a result, the mobile communication in 150 and 400MHz band is enabled for the total length in tunnel. |
