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Propagation of EM signals in underground mines.

Authors
Cory-TS
Source
Washington, DC: U.S. Department of the Interior, Bureau of Mines, Contract H00366028, 1977 Sep; :1-158
NIOSHTIC No.
10001377
Abstract
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.
Keywords
propagation characteristics; conductors; overburden and underburden conductivities; communication range; MF frequencies
Publication Date
19770901
Document Type
CP; Final Contract Report
Funding Type
Contract
Fiscal Year
1977
NTIS Accession No.
PB-289757
NTIS Price
A09
Identifying No.
OFR-136-78; Contract-H00366028
NIOSH Division
PRC
Source Name
Washington, DC: U.S. Department of the Interior, Bureau of Mines, Contract H00366028
State
IA; PA
Performing Organization
Rockwell International
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