In my several decades' experience, the major cause of power line RFI
have been:
1. Poorly bonded hardware, including incidental contact.
2. Failed lightning arrestors
3. Failed insulators
Number 1 is by far the most common. This has included loose tie wires,
neutral wires contacting guy wires, and a ground wire contacting a cable
TV cable. I've not experienced the dreaded staple to ground wire. It's
possible these are lost in the background, as I'm surrounded by overhead
distribution lines, with thousands of potential of the three above.
73,
Scott K9MA
On 12/31/2024 8:32 PM, Jim Brown wrote:
On 12/31/2024 2:49 PM, thoyer1--- via RFI wrote:
Turns out it was a bad lightning arrestor (as several suggested)
In a fine ARRL book by an experienced power line noise engineer that I
bought about 20 years ago, the author observed that almost all noise
generated by power systems is the result of something failing,
resulting in arcing, insulators being a common one.
Several years ago, Jeff, AC0C, alerted us to the use of MOVs in
distribution lines, and noise resulting when they fail. He sent
photos, which I added to my applications note on chasing noise.
73, Jim K9YC
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Scott K9MA
k9ma@sdellington.us
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