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Mining Publication: Magnetic Field Strength Mapping of the Helvetia Coal Co. Lucerne No. 8 Mine at Medium Frequency
Keywords: Medium frequency communications systems Nonionizing radiation Radiometry Wireless node communications systems
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: September 1977
Authors: TS Cory
Contract/MOA Report - September 1977
Download PDF Document (0.55 MB)
NIOSHTIC2 Number: 20030898
U.S. Bureau of Mines contract No. P0372716, 1977 Sep; :1-28
This report describes magnetic field measurements in the Helvetia Coal Co. Lucene No. 8 Mine for purposes of deriving a mapping of the magnetic field strength covering the major haulageways which contain conductors. The results of the testing at medium frequency show that coverage of the entire mine area containing conductors can be achieved employing wireless radio techniques whereby radio signals are coupled into and are carried by these conductors. These results confirm earlier qualitative testing of the Collins Mine Wireless Radios in this mine. These results, performed over the frequency range 71-2890 kHz, illustrate the effect of frequency on the radio propagation with the conclusion that the best overall coverage is obtained at frequencies approximating 1000 kHz. This report presents all the raw data and the reduced data in the form of magnetic field strength contour maps. Sufficient information is provided to enable independent reduction of the data. A summary of observations which can be made directly from the contour maps is given.
Image of publication Magnetic Field Strength Mapping of the Helvetia Coal Co. Lucerne No. 8 Mine at Medium FrequencyContract/MOA Report - September 1977
Download PDF Document (0.55 MB)
NIOSHTIC2 Number: 20030898
U.S. Bureau of Mines contract No. P0372716, 1977 Sep; :1-28
See Also
Advanced Tutorial on Wireless Communication and Electronic Tracking: Appendix B
Antenna Design & Coupling Studies at Medium Frequency for lmproved Coal Mine Communications
A Comparison Between SSB and FM Modulation Processes in a Near Field Medium Frequency Wireless Communication System
Develop a Means to Model Network Performance Using Network Simulation Tools
Interaction of Radio Transmissions on Mine Monitoring and Control Systems
Medium-Frequency Propagation in Coal Mines
Propagation of EM Signals in Underground Mines
Subterranean Wireless Electronic Communication System
Transmit Antennas for Portable VLF to MF Wireless Mine Communications
Wireless Communications for Trackless Haulage Vehicles
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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