Radio communication systems for underground mines
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United States of America Patent
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-
Oct 11, 1988
Grant Date -
N/A
app pub date -
Jul 27, 1982
filing date -
Jul 27, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A radio communications system operational within the medium frequency range for underground mine communications, coupling MF carrier signals into existing conductive channels extending to within the mine and devices within the mine and coupled to the conductive channel for receiving the MF carrier signals and communicating with portable and mobile transceivers operational within the MF frequency range and in the common seam mode.
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