It doesn’t have to be something that serious: two pieces of poorly bonded
hardware anywhere near a high voltage line will do it, especially if it’s
within a few hundred meters of your antenna. They don’t have to be directly
connected to the line.
73,
Scott K9MA
----------
Scott Ellington
--- via iPad
> On May 24, 2020, at 12:04 PM, Gary Johnson <gwj@wb9jps.com> wrote:
>
>
>>
>> From: K9MA <k9ma@sdellington.us <mailto:k9ma@sdellington.us>>
>> To: rfi@contesting.com <mailto:rfi@contesting.com>
>>
>> The clincher, in this case, is that the source goes silent when it is
>> wet, returns when it dries out.
>
>
> We had persistent power line noise at N6RO for two years, and indeed it went
> silent whenever it rained. Eventually the PG&E guy came out and precisely
> located it (he was a ham, as it turned out). Root cause: A cracked insulator
> on a 13 kV line. Rain would apparently suppress the corona discharge. No
> issues after the equipment was replaced.
>
> The character of the noise was a broad-banded and erratic sizzle, on all the
> low bands. Mostly looked like white noise on the waterfall. In contrast, the
> noise caused by my neighbor’s infamous LED lights, which have no filtering on
> the AC line side of their switchmode converters, was a powerful 120 Hz
> harmonic buzz from dc to daylight.
>
> Gary NA6O
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