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Improved Grounding System for Mountain Top Radio Sites,
FEDERAL EMERGENCY MANAGEMENT AGENCY DENVER CO
In 1980, Warren R. Jones, IEEE, published a paper on the use of Bentonite well drillers mud when installing vertical ground rods. This concept has now been developed to use copper tubing in a lateral trench radial type ground that has been backfilled with layers of Bentonite. In the case of mountain top sites, it is usually possible, with machinery, to obtain a trench that is 200 mm 8 in. to 600 mm 24 in. deep. In fact, 32 sites in the Utah state radio system are now using this grounding method. Several of these sites are over 3460 M 11, 350 ft. and are difficult to ground by any method, but during the past two summers, they have been successful in getting a backhoe and dry Bentonite to these locations. In addition to the radial ground, Metal Oxide Varistors MOV, bipolar zeners and coax tees with protectors are used to complete the protective scheme.
This article is from 'International Aerospace and Ground Conference on Lightning and Static Electricity (8th): 'Lightning Technology Roundup,' held at Fort Worth, Texas on 21-23 June 1983,' AD-A135 100, p29-1 thru 29-4.