Vehicular communications 2500 feet underground

An underground communications system has been installed in Bethlehem Mines Corporation's Grace Iron Mine. The system provides communications for trackless vehicles and roving personnel without the requirement for a dispatcher. UHF/VHF repeaters are combined with coaxial "leaky-feeder"...

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Bibliographic Details
Published in27th IEEE Vehicular Technology Conference Vol. 27; pp. 161 - 165
Main Author Chufo, R.L.
Format Conference Proceeding
LanguageEnglish
Published IEEE 1977
Subjects
Communication cables
Communication system control
Condition monitoring
Control systems
Hardware
Personnel
Production
Repeaters
Shafts
Wireless communication
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Summary:An underground communications system has been installed in Bethlehem Mines Corporation's Grace Iron Mine. The system provides communications for trackless vehicles and roving personnel without the requirement for a dispatcher. UHF/VHF repeaters are combined with coaxial "leaky-feeder" and twin-lead transmission line to form an operational and emergency communication network not previously found in mine communication systems. Key functions are evacuation alarming, personnel paging and communications with maintenance personnel and the underground ambulance.
DOI:10.1109/VTC.1977.1622436