On 4/9/2021 1:06 PM, Dennis W0JX via TowerTalk wrote:
I have a similar question. I have pulled copper 1/2" and 3/4" water pipe out of
the ground after several years and have found that the surface of the pipe is a dark
brown color, most likely oxidized copper. I have measured the surface resistance and note
that it can be high.
That means that we must consider the chemistry both the rod and of the
soil, and choose a rod least likely to react. An optimistic view of
things (voiced by N0AX in his ARRL book on the topic) is that stores in
a given location will stock rods whose chemistry is suitable.
73, Jim K9YC
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