[RFI] powerline noise that seems to peak in frequency

[Kelly Johnson]

I noticed the same thing today for the first time.  It was very
strange.  I have a powerline pole 2 doors down that I've been trying
to get PG&E to fix since May.  Some days are worse than others.  It's
been quiet all week since the rains early in the week, but today (a
nice, sunny California "winter" day) the noise was loud and clear
again.  Strangely enough, though, the noise was S7 in the SSB part of
the band (around 28.450), but was S0 in the CW part of the band.  At
first I thought it was due to my narrow CW filter, but the noise was
still S0 in the CW part of the band even after I changed to my 2.4KHz
SSB filter and USB.  I had never seen this before.


On 12/8/07, Richard (Rick) Karlquist <richard at karlquist.com> wrote:
> This is not usual at all, due to resonances in the power
> wires.  It is surprising how sharp they are.
>
> Rick N6RK
>
> Pete Smith wrote:
> > Today, listening on 10m, I noticed that whenever I tuned into the 28400-475
> > range, there would be a marked increase in what sounded very much like
> > ordinary powerline noise.  Trouble is, I'm not aware of any mechanism that
> > could account for this "peaking" in a certain frequency range.  I have
> > checked the rx, and it has the same apparent sensitivity in that range as
> > elsewhere in 10m.
> >
> > 73, Pete N4ZR
> > The World HF Contest Station Database
> > Full details on 3435 contest stations - hundreds of new and updated listings
> > Just updated 11/27/07 http://www.pvrc.org/WCSD/WCSDsearch.htm
> >
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