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Electromagnetic Propagation In Low Coal Mines At Medium Frequencies
  • Published Date:
    6/1/1978
Filetype[PDF-2.47 MB]


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  • Description:
    This report covers magnetic field strength measurements vs range and frequency in low-medium coal mines. Both quasi-conductor-free and conductor-proximity areas were investigated. The program covered 5 mines, 4 seams, 6 measurement sets, and 3 geographic areas. The results have been 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.

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