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Mining Publication: Medium-Frequency Propagation in Coal Mines
Keywords: Coal mining Communications Medium frequency communications systems Nonionizing radiation
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: August 1978
Authors: HK Sacks, RL Chufo
Conference Paper - August 1978
Download PDF Document (0.39 MB)
NIOSHTIC2 Number: 20032395
Proceedings of the Fourth WVU Conference on Coal Mine Electrotechnology, Aldridge-MD, ed. Morgantown, WV, Aug 2-4, 1978, 1978 Aug; :27-1-27-12
Medium-frequency (MF) waves can propagate in a coal seam, bounded above and below by conducting rock, in an approximate transverse electro-magnetic (TEM) transmission-line mode with the electric field vertical and the magnetic field horizontal. The theory of this coal seam mode is applied to recent MF data for a number of mines in order to classify the propagation characteristic of the mines in a simple way. When conductors such as rails, trolleylines, or power cables are present in the vicinity of the measurement path, it is found that the magnetic field versus range plots have two distinct regions with very different slopes. This effect is attributed to coupling of the cylindrically spreading coal seam mode to a low-attenuation conductor guided mode. As a result, voice communications range between mobile transmitters can extend several thousand meters. The use of MF for mine communications is discussed.
Image of publication Medium-Frequency Propagation in Coal MinesConference Paper - August 1978
Download PDF Document (0.39 MB)
NIOSHTIC2 Number: 20032395
Proceedings of the Fourth WVU Conference on Coal Mine Electrotechnology, Aldridge-MD, ed. Morgantown, WV, Aug 2-4, 1978, 1978 Aug; :27-1-27-12
See Also
Interaction of Radio Transmissions on Mine Monitoring and Control Systems
Medium Frequency Radio System Modifications for Refuge Chamber Situational Awareness
Modeling and Data Analysis of 50 to 5000 kHz Radio Wave Propagation in Coal Mines
Propagation of EM Signals in Underground Mines
Research and Development Contract for Coal Mine Communication System: Volume 1 - Summary and Results of System Study
Research and Development Contract for Coal Mine Communication System: Volume 2 - Mine Visits
A Spatial/Spectral Domain Microwave Coal Seam Imaging Sensor-Progress in Signal Processing
Theory on the Propagation of UHF Radio Waves in Coal Mine Tunnels
Transmit Antennas for Portable VLF to MF Wireless Mine Communications
Ultra-Low Frequency Through-the-Earth Communication Technology
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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