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This report is a comprehensive summary of the results of the propagation measurements program conducted for the Bureau of Mines. Data were gathered in the medium frequency (MF) range from a cross sample of six mines representative of the industry having typical wireless requirements. From the data that were gathered, a logical method of data reduction is presented that culminates in a set of average attenuation characteristics for all mines visited. These characteristics define a typical MF wireless system when the communication range requirements are known. Direct through-the-earth propagation and the range enhancement mechanism due to coupling on-and-off conductors are evaluated and related to the planning of a typical wireless MF communications system.
| Author(s): | Cory-TS |
| Reference: | Rockwell International. U.S. Bureau of Mines Contract No. H00366028. NTIS No. PB/289-757, 1977; :1-158 |
h0366028 (PDF, 3157 KB) (image based PDF - searchable with Adobe Reader 7)
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