[TowerTalk] Re; Ground Rod Plating

[Lux, Jim]

On 4/9/21 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.
> Does that mean that after a certain number of years, the effectiveness of my beverage and other antenna ground rods decreases significantly? Does that mean they should be replaced on a periodic basis?
> I've tried chemical removal of this oxidized coating but the most effective way is scouring with abrasive pads and sanding with sand paper.
> 73 Dennis W0JX
> ________



It might have higher DC resistance, but it's a thin layer, and at RF, it 
might just be a big capacitor. What's the C of a 8 ft long, 1/2" 
diameter cylinder with a few mils of oxide dielectric?

For lightning, I wouldn't worry - the voltage will puncture the oxide 
with no problem.