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Improved hardware for trolley wire phone systems.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, H0166144, 1979 Mar; :1-55
This report presents the investigation and engineering of state-of- the-art trolley wire phone hardware. The various problem areas of trolley wire communication systems are discussed with the objective of improving circuit performance to compensate for the poor transmission characteristics of the line. Relatively inexpensive hardware designed for this purpose is detailed and documented.
Communication equipment; Design; Loop antennas; Mines(Excavations); Transmitter receivers; Wired wireless
CP; Final Contract Report
NTIS Accession No.
OFR 49-81; Contract-H0166144
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, H0166144
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division