> that is a good tool for coronal and arc discharges.
> Dave - W�LEV
Yes, good tool, but keep in mind that it will not hear an arc on the
"other side" of
a structure. It has to be line of sight from the arc to the receiver or
at least close
to that.
RE the QST article ultrasonic pin-pointer...has anyone built it? If so,
how
sensitive was it....could you hear a very small arc at 50ft? Was the
circuit quiet...i.e. was there
any "hiss" when it wasn't detecting any signal?
73,
Charlie, N0TT
>
> On Fri, Apr 16, 2021 at 9:31 PM Christopher Wawak <kc2ieb@wawak.org>
> wrote:
>
> > Hi all! I ended up splurging on this doohickey -
> > https://mfjenterprises.com/products/mfj-5008 . It's an ultra-sonic
> > receiver
> > that purports "to pick up the noise generated by the corona
> discharge and
> > arcing connections". For those who may not be following my saga, I
> > determined using a portable SDR radio that the same noise that
> obliterates
> > 40m up through 10m comes strongest from one of two electric poles
> near my
> > house. No other poles exhibit the noise. Using the MFJ-5008, I
> immediately
> > heard a very strong ringing from one of the two poles, which
> doesn't show
> > up when I point it at other poles, houses, etc. There's a little
> sight hole
> > you can use to pinpoint the noise, which I did - it seems near the
> top of
> > the pole is where the sound is loudest. Very easy to use, and
> seemed to
> > work as advertised. Totally understand why this is expensive, it's
> a very
> > niche item. I'll need to find a lot of RFI to make up the price
> tag, but
> > additional evidence helps!
> >
> > I called the power company, who initially said they'd have a crew
> out in 4
> > hours. After days with no visit, and numerous calls to PSEG, they
> have no
> > information to provide. I filed a complaint with the NJ Board of
> Public
> > Utilities asking that they follow up with PSEG and compel them to
> consider
> > my complaint. If anyone has a contact with PSEG, I'd really
> appreciate a
> > connection off list.
> >
> > If folks are interested, I'll try to make a little video of using
> the
> > device. Also, if you're in the Southern NJ area and need to borrow
> it, I
> > accept beer! :)
> >
> > Thanks again for the help and moral support!
> >
> > 73 Chris KC2IEB
> >
> > On Sun, Apr 11, 2021 at 3:05 PM Christopher Wawak
> <kc2ieb@wawak.org>
> > wrote:
> >
> > > Hi All!
> > >
> > > I wanted to share where I was currently with my noise issue.
> > >
> > > Surprise surprise, I don�t think it�s solar panel noise!
> After doing some
> > > more direction finding, I seem to have nailed the source down to
> either
> > my
> > > electric meter, or one of two telephone poles. Initially I used
> an IC-705
> > > with the Flag antenna that was in QST recently and a DXE
> > > preamp/attenuators. Once I verified the signature of the same
> noise that
> > > I�m getting in my antennas, I went back with a cheap AM
> antenna, since it
> > > was easier to record a video.
> > >
> > > I do have an RFI log I can share on request.
> > >
> > > I�m curious what you all think of my radio direction finding
> based on a
> > > short video I created.
> > >
> > > https://youtu.be/v3oJLtUBrlc
> > >
> > > 73
> > > KC2IEB Chris
> > >
> > > On Sun, Mar 14, 2021 at 3:00 PM Christopher Wawak
> <chris@wawak.org>
> > wrote:
> > >
> > >> Hi RFI List,
> > >>
> > >>
> > >> I'm faced with S7-S9 noise across 40m-15m at 200khz intervals.
> I'm
> > >> looking for assistance resolving this RFI I suspect is coming
> from a
> > >> neighbor's solar installation. The owners are elderly, and I'm
> not sure
> > >> they'll understand and be able to remedy the situation. HF is
> next to
> > >> unusable.
> > >>
> > >>
> > >> Some questions:
> > >>
> > >> 0. So far, do I seem on the right path?
> > >>
> > >> 1. What tactics have worked in the past with getting owners to
> respond?
> > >>
> > >> 2. Right now I have an AH-4 with a wire antenna. If I switched
> to, say,
> > a
> > >> fan dipole or a beam antenna would i be able to reject the
> solar panel
> > >> noise? If my antenna were higher up, would that help?
> > >>
> > >> 3. Am I doomed to not have workable HF at home?
> > >>
> > >>
> > >> 73 Chris KC2IEB
> > >>
> > >>
> > >> (if the pictures are filtered, click here
> > >> <
> >
>
https://docs.google.com/document/d/e/2PACX-1vSKoiPx-5huAG5M1gLmYFyMPRZ_WY
0PxxoC-CH7c-dpXMQZzHuvLzNX2AB8_nb8RIsN7Ri0rmXJp6Ju/pub
> > >
> > >> )
> > >>
> > >> RFI Location
> > >>
> > >> Appears to be coming from solar panels on a house behind my
> own, about
> > >> 275� away. I traced this with a loop antenna and a cheap AM
> radio
> > >> following to where the noise seemed loudest.
> > >>
> > >> Characteristics
> > >>
> > >> Heavy S7+ �hash� noise every ~200 khz, starting around 40m
> and going all
> > >> the way up through 15m.
> > >>
> > >>
> > >> Generally starts an hour or two after sunrise, and shuts down
> before
> > >> sunset.
> > >>
> > >> Noise Log
> > >>
> > >> 3/13/2021
> > >>
> > >> 4:00 PM Local - https://www.youtube.com/watch?v=QQZr1xXIf0Y
> whole house
> > >> power off test @ 3:14 in the video - no improvement
> > >>
> > >>
> > >> Gone by 7:53 PM
> > >>
> > >> 3/14/2021
> > >>
> > >> 8:38 am
> > >>
> > >> Some squiggles
> > >>
> > >> Showed up almost on the dot at 9am
> > >>
> > >> It�s moving down the band some
> > >>
> > >> Most noticeable from 20m on up
> > >>
> > >> .
> > >>
> > >>
> > >>
> > >> --
> > >> -- Chris
> > >>
> > >
> > _______________________________________________
> > RFI mailing list
> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
> >
>
>
> --
> *Dave - W�LEV*
> *Just Let Darwin Work*
> _______________________________________________
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