This is certainly 120 Hz power line noise. Walk the lines with an
ultrasonic microphone coupled to a small parabolic or spherical reflector.
MFJ makes one for about $100.
Dave - WØLEV
On Fri, Dec 6, 2019 at 11:54 PM Don Kirk <wd8dsb@gmail.com> wrote:
> Hi Eric,
>
> Using a simple PC based sound scope, the bursts of noise are indeed at a
> frequency of 120 Hz, and looks just most of the power line arcing I have
> tracked down over the years.
>
> I will e-mail you a screen shot of scope capture.
>
> 73,
> Don (wd8dsb)
>
> On Fri, Dec 6, 2019 at 4:31 PM Eric Rosenberg <ericrosenberg.dc@gmail.com>
> wrote:
>
> > This may not have made it through the first time.
> >
> > --------------------------------------------
> >
> > My good friend Tm Shoppa, N3QE has run into a vexing RFI issue.
> >
> > He posed the following on the PVRC reflector, but is not on the RFI
> > reflector.
> >
> > Please feel free to respond directly to Tim.
> >
> > Thanks & 73,
> > Eric W3DQ
> >
> > ------ Forwarded Message ------
> > From: "Tim Shoppa via PVRC"
> > Sent: 12/6/2019 3:18:35 PM
> > Subject: [PVRC] Help me identify my new RFI
> >
> > In the past week a brand new 24x7 noise source came out of nowhere.
> > Clearly audible all over my neighborhood under every power line 540kHz -
> > 1710kHz.
> >
> > Recording made on 1.8MHz with receiver in 2400Hz bandwidth AM:
> > http://n3qe.org/n3qe-rfi.wav
> >
> > Heard in AM, this not simple 120Hz impulse noise but shows strong
> > 800Hz-1200Hz audio component interrupted at 120Hz. Waveform picture of
> > the above audio sample shown below (not attached).
> >
> > Any ideas?
> >
> > Tim N3QE
> > _______________________________________________
> > RFI mailing list
> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
> >
> _______________________________________________
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> RFI@contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
>
--
*Dave - WØLEV*
*Just Let Darwin Work*
*Just Think*
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