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Electromagnetic propagation in low coal mines of medium frequencies.

Authors
Cory-TS
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract H0377053, 1978 Jun; :1-94
NIOSHTIC No.
10002377
Abstract
This report covers magnetic field strength measurements versus range and frequency in low to medium coal mines. Both quasi-conductor- free and conductor-proximity areas were investigated. The program covered five mines, four seams, six measurement sets, and three geographic areas. The results are summarized in terms of maximum communication range expected per seam and noise condition. Scatter gain is further explored as a simple measure of energy coupled to conductors.
Keywords
MF wireless radio propagatlon; maximum communication range; conductor-free areas; conductor-proximity areas; set limited noise; median mine noise
Publication Date
19780612
Document Type
CP; Final Contract Report
Funding Type
Contract
Fiscal Year
1978
NTIS Accession No.
PB82-202656
NTIS Price
A06
Identifying No.
OFR-63-82; Contract-H0377053
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract H0377053
State
IA; PA
Performing Organization
Rockwell International
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