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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 10:39:43 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>

From the dictionary: There is no need to go any farther. Forget your calculations, this is the definition.

Electrical resistivity quantifies how strongly a given material opposes the flow of electric current. A low resistivity indicates a material that readily allows the movement of electric charge. Resistivity is commonly represented by the Greek letter ρ. The SI unit of electrical resistivity is the ohm⋅metre although other units like ohm⋅centimetre are also in use. *As an example, if a 1 m × 1 m × 1 m solid cube of material has sheet contacts on two opposite faces, and the resistance between these contacts is 1 Ω, then the resistivity of the material is 1 Ω⋅m.* (that is misleading as the formula actually gives ohms per cubic meter, not ohms per meter.

Please note Resistivity is in ohms per cubic Centimeter or ohms per cubic meter not ohms per meter, or centimeter as is often stated which is incorrect. When calculating you must use ohms cc^3 or M^3 for the units to properly cancel.

Too many texts use the simplified versions which are misleading.

73

Roger (K8RI)

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