My dear old SK friend Al Caplan, who used to manage the Hy-Gain
amateur division when it was part of Telex, was emphatic about proper
grounding when I bought my HG-52 crankup. He said that lightning
could split the concrete around the re-bar if the tower took a direct
strike. It was a long time ago, but my recollection was that this
nasty event actually occurred to some unfortunate ham who had to
abandon the old foundation and install a new one in a different location.
73 Mike N6MZ
At 17:17 30-12-12, Patrick Greenlee wrote:
I have a friend who is a ham and is EE with 30+ years of antenna
design experience. He tells me emphatically, "concrete is not a
good conductor." Given this, I'd be trying to not depend on concrete
as part of a grounding system. Rebar installed correctly in steel
reinforced concrete is probably at least 2 inches under the surface
of the concrete on any side, top, or bottom. Weld plates installed
when the concrete was wet (to give you something to anchor to) or
bolts or other components set into the concrete are typically NOT in
contact with the rebar cage inside the concrete (which is not a good
conductor anyway.) So again, it is better to not rely on the
concrete to conduct.
73 Patrick AF5CK
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|