This instructable provides some additional theory, and practical
application:
https://www.instructables.com/Ultrasound-Listener-Electronics-that-expand-your-a/
Cool stuff!
On 4/16/21 9:09 PM, qrv@kd4e.com wrote: The original design is here: > >
http://www.arrl.org/files/file/Technology/PLN/Ultrasonic_Pinpointer.pdf
> > 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
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