The noise at the crepe myrtle, now trimmed away from the pole, is still
gone. Only thing I can theorize is that it was a combination of perfect
conditions. Dry ground here lately thus poor ground for the ground wire
and crepe myrtle (a tree) with spring sap flowing and deep tap root was
providing a better ground and grew just close enough to set up a gap. A
couple of the limbs I saw had flattened out around the old wood pole and
probably the ground wire. It surprised me when i heard it down low on
the pole with ultrasonic. And of course my doublet antenna end is within
feet of this area. I was told all voltage in my county is 7.2kv.
Chuck
W4NBO
On 5/26/21 11:15 AM, K9MA wrote:
I have, back before they increased the voltage to 14 kV. The noise correlated
well with branches swaying in the wind. When I finally got the utility to trim
the trees, the noise level went way down.
At 14 kV, it seems that any contact with vegetation gets their attention
immediately.
73,
Scott K9MA
----------
Scott Ellington
--- via iPad
On May 25, 2021, at 6:52 AM, Mike Martin <mike@rfiservices.com> wrote:
Contrary to what many people say about finding their sources as trees touching
the line, I have never had a tree arching to the wire creating RF noise.
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