Electromagnetic propagation in low coal mines of medium frequencies.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract H0377053, 1978 Jun; :1-94
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.
MF wireless radio propagatlon; maximum communication range; conductor-free areas; conductor-proximity areas; set limited noise; median mine noise
CP; Final Contract Report
NTIS Accession No.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract H0377053