QUOTE: 1. On the pan adapter, looks like power line noise. Random dots
across the screen.
Powerline noise would appear on an o'scope as a double exponential every
120 Hz or 8.3 ms.
Dave - WØLEV
On Sun, Nov 23, 2025 at 7:20 PM Jeff (W4DD) <w4dd09@gmail.com> wrote:
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> I am working on a RFI case that we believe is coming from a nearby home.
> The owner is a little cooperative, but is not interested in doing a ckt
> breaker test. The noise exhibits some interesting characteristics that may
> help us in suggesting he unplug a device. Perhaps someone has seen this
> before.
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> 1. On the pan adapter, looks like power line noise. Random dots
> across
> the screen.
> 2. No repeating clusters of noise vs frequency that might suggest a
> SMPS.
> 3. No correlation to sunlight or darkness. No correlation to time of
> day.
> 4. Has distinct levels of interference; we have noted -85dBm, -78dBm,
> -72dBm (S-9), -66dBm. Interesting the levels are about 6dB apart. -78 and
> -72 are most common.
> 5. The neighbor has a solar system installed roughly 2 years ago, but
> as mentioned, no correlation to sunlight/darkness or time of day.
> 6. Affects mostly 80M but can be heard on other bands
>
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> Has anyone seen 4 levels of noise from a device before?
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> Thanks for any ideas.
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> Jeff, W4DD
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>
--
*Dave - WØLEV*
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