QUOTE: These carriers were -95 dBm (S-9 + 22) with my loop 280 feet away.
S-9 is -73 dBm. -95 dBm would not be S-9 + 22 dB. Assuming 6 dB per
S-Unit (the old proposed Collins standard in a 50-ohm system), that would
make -95 dBm at roughly an S-5. Still a reasonably strong signal with
the "antenna" 280-feet distant.
There have been a number of reports of the Tesla chargers being quite a
source of RFI on other sites as well as this one.
Dave - WØLEV
On Mon, Apr 27, 2026 at 6:36 PM Tom Thompson <w0ivj@tomthompson.com> wrote:
> Recently I measured the RFI emitting from a Tesla Power Wall 3 connected
> to a solar array all of which was connected to the grid. I used a tuned
> loop into a receiver. The loop receives signals 26 dB down from a 40m
> inverted Vee up 40 feet.Expecting a broad band signal from an inverter,
> I was surprised to here a relative pure carrier every 250 kHz.These
> carriers were -95 dBm (S-9 + 22) with my loop 280 feet away. Here are
> two spectra for 20m and 40m, along with a time domain capture. The
> enhanced noise is where the loop tuned.
>
> Has anyone else observed this?
>
> Tom W0IVJ
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>
--
*Dave - WØLEV*
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