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Re: [TowerTalk] Fwd: Tower base/Ufer ground

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Fwd: Tower base/Ufer ground
From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Sun, 18 May 2014 00:13:33 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 5/17/2014 11:27 PM, Jim Lux wrote:
On 5/17/14, 6:11 PM, Drax Felton wrote:
What is the conductance per inch of concrete in mho's ?


http://www.k1ttt.net/technote/concrete.html
10-50 mS/m

Shouldn't the medium be in cubic units?

With concrete it varies widely, but when you get that large, it's the surface area that dominates.

Resistivity, the inverse of conductivity is in cubic units. Unfortunately the "new" Si units are no longer meaningful and require conversions. Typically Resistivity is measured in CC as would Siemens(mho's), but much depends on the size of the samples. Measuring CC is a whale of a lot easier than cubic meters (the probes are a whole lot easier to make and use

73

Roger (K8RI)

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