[TowerTalk] High voltage transmission lines
terry at kk6t.com
Mon Oct 22 15:39:00 EDT 2007
How do you all find out what voltage the HV lines are near you? Are
there searches/maps available on the internet?
73 de Terry KK6T
Kelly Johnson wrote:
> 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 <n6ry at arrl.net> 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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