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Re: [IRCA] Ground Resistance (A further question)
Hello Tom
I did not appreciate copper pipe of different lengths gives lower resistance. 10 footers are a none starter here. Would 3 x 3 foot copper ground rods be around 10 Ohms or are the mathematics not as simple as that? I use a EWE antenna where grounding is all important by all accounts.
Barry
--- On Wed, 11/3/09, Tom Jasinski <amdxer@xxxxxxxx> wrote:
From: Tom Jasinski <amdxer@xxxxxxxx>
Subject: [IRCA] Ground Resistance
To: irca@xxxxxxxxxxxxxxxx, am@xxxxxxxxxxx
Date: Wednesday, 11 March, 2009, 3:34 PM
There has been some recent discussion about outdoor antennas and grounds.
No one has mentioned what a good ground RESISTANCE is. Here is my two cents
worth.
Since last fall I have been measuring ground resistance from four TEST
ground rods in my back yard. The rod specs are as follows; one 3/4" dia
X
10 foot copper clad steel, one 5/8" dia X 8 foot copper clad steel, one
1/2"
dia X 30 inch copper tubing (some people call it pipe) and one 5/8" X
24"
copper clad steel.
This is what I read today for each of these rods using a 3 point method with
a B&K Model 309 ground resistance meter.
10 footer has around 10 ohms
8 footer has around 23 ohms
30 incher has 166* ohms
24 incher has 175* ohms
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