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An Application of the Dedicated Wire Technique to Improve Coal Mine Trolley Carrier Phone Communications.
NTIS: PB/83-149070 :78 pages
A whole-mine experiment to assess the practical feasibility and utility of the dedicated-wire technique to overcome poor trolley carrier phone system performance at a large underground coal mine was designed, performed, and evaluated. The technique involves the use of a single, low-loss, properly terminated, and branched auxiliary wire placed in the rail haulageway. This auxiliary dedicated wire allows signals to electromagnetically couple to the trolley wire-rail transmission line and thereby significantly decreases the overall signal attenuation rate on the trolley wire- rail line. The in-mine dedicated-wire demonstration program and its results, conclusions, and recommendations are described.
CP; Final Contract Report;
NTIS Accession No.
Arthur D. Little, Inc.
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division