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Radio propagation measurements in coal mines at UHF and VLF
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1973
Source: Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 54-61 -
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Description:Radio propagation measurements were conducted in a coal mine at UHF (200 to 1000 MHz) and VLF (1 to 50 kHz) to characterize the transmission loss of intra-mine paths. The basic experimental parameters included frequency, polarization, path orientation and distance. Further tests evaluated the performance of roof-bolt vs. loop antennas at VLF and parasitic reflectors at UHF. Measurement results are summarized in a series of transmission loss curves. Examples are presented to show the use of these curves in predicting the performance of radio communication systems in mines.
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Main Document Checksum:urn:sha256:4d405488f2f1ac9d7235938a354b2752a430c91e8f00d9f154dc02b20dd3233d
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Personal Author:
Lagace, Robert L.
1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
Description:
The attention of this group was focussed on four through-the-earth communication systems that are presently of high interest to the U.S. Bureau of Min...
Personal Author:
Jones, F. W.
1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
Description:
The perturbation of alternating electromagnetic fields by three-dimensional structures is considered. The general model is that of a semi-infinite con...
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