Mining Publication: A Whole-Mine Medium-Frequency Radio Communication System
A medium-frequency (MF) communication system has been built and has been tested in underground mines. It provides radio coverage to vehicles and personnel anywhere in the mine via parasitic coupling into existing mine conductors. The system consists of base stations, repeaters, and vehicular and personnel transceivers. Air-core antennas for vehicles and clamp-on antennas for base stations and repeaters were designed for maximum coupling efficiency using existing mine wiring. Personnel transceivers are of a unique vest design that features a low physical profile, good user comfort, and efficient antenna design. In-mine tests show impressive results. Range between rubber-tired vehicles and base stations is often measured in miles. With repeaters, greater range is possible.
Conference PaperJuly - 1982
NIOSHTIC2 Number: 20033464
The Sixth WVU Conference on Coal Mine Electrotechnology, Cooley-WL, ed., Morgantown West Virginia, Jul 28-30, 1982, 1982 Nov; :1-13