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Re: [TowerTalk] High voltage transmission lines

Subject: Re: [TowerTalk] High voltage transmission lines
From: "Kelly Johnson" <>
Date: Mon, 22 Oct 2007 09:49:42 -0700
List-post: <>
My experience is similar.  I live only about 200 ft. from some HV
lines and about 100 feet from the MV lines.  The MV lines are by far a
bigger problem for me.  The ONLY time I hear noise from the HV lines
is when it rains.  Fortunately for me, it doesn't rain that much here
in California.  The noise from the HV lines is definitely loud when it
rains, but the rest of the time they are MUCH quieter than the MV

On 10/22/07, Terry Conboy <> wrote:
> At 11:32 AM 2007-10-21, Steve K8JQ wrote:
> >A possible home site I'm looking at is situated between two high voltage
> >transmission lines. The two transmission lines run roughly east-west and
> >are approximately parallel to each other.
> >
> >The transmission line to the north is either 345KV or 765KV (I received
> >conflicting information) and was constructed in the 1990's. It is about
> >800ft distant from the home site.
> This echoes the comments from Roger, VE3ZI.
> I worked for an electric utility in Oregon in the 1980's and if I
> were you, I'd stay far away from lines with anything close to 500
> kV.  All these lines exhibit corona, which is especially pronounced
> during precipitation or heavy fog.  The corona generates incredibly
> loud noise, both audibly and in the RF spectrum.  The noise is worst
> in the low bands and declines at higher frequencies.
> The original designs for 500 kV lines used a single conductor per
> phase, but they made so much noise that even VHF TV reception was
> affected for nearby homes.  Newer lines use two or three spaced
> conductors per phase to lower the voltage gradient and reduce the
> corona, but they are still bad.
> We had a 500 kV line with two-conductors per phase from a generating
> plant in eastern Oregon.  It passed about 1/4 mile from a ham who
> liked to ragchew on 80m SSB.  Fortunately, that's a pretty dry area,
> but anytime it did rain, he had to shut off his radio in disgust.  He
> filed complaints (with the PUC, I think), but there really wasn't
> anything to be "fixed", unless you think that shutting down a 550
> megawatt plant or relocation assistance (for the ham) would qualify as a fix.
> 73, Terry N6RY
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