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Technical services for mine communications research - transmit antennas for portable VLF to MF wireless mine communications.

Authors
Lagace-RL; Curtis-DA; Foulkes-JD; Rothery-JL
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract No. H0346045, :1-158
NIOSHTIC No.
10001390
Abstract
An investigation was made of the feasibility of developing compact transmit antennas and/or other means to efficiently couple very low frequency (VLF) to medium frequency (MF) band radio energy between portable wireless communication units in coal mines. The completely wireless communication range between two portable radios equipped with practical size reference loop antennas in representative coal mine environments was estimated. Antenna technology was assessed with respect to transmit moment, range, intrinsic safety, battery, and wearability requirements to determine the most suitable antenna types for use by miners. It was concluded that aircore bandolier loop antennas, and perhaps ferrite-loaded loop antennas, having peak transmit moments of about 2.5 Ampere/m2 would be the most effective antennas for portable units.
Keywords
Mining-industry; Radio-waves; Underground-mining; Coal-mining
Publication Date
19770501
Document Type
CP; Final Contract Report
Funding Type
Contract
Fiscal Year
1977
NTIS Accession No.
PB-285004
NTIS Price
A09
Identifying No.
OFR-92-78; Contract-H0346045
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract No. H0346045
State
PA; MA; DC
Performing Organization
Arthur. D. Little, Inc.
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