They use DC to prevent skin effect loss at AC.
73
Gary K4FMX
> -----Original Message-----
> From: towertalk-bounces@contesting.com [mailto:towertalk-
> bounces@contesting.com] On Behalf Of ve4xt@mts.net
> Sent: Tuesday, August 15, 2006 2:21 PM
> To: Alan NV8A; towertalk@contesting.com
> Cc: Craig Clark
> Subject: Re: [TowerTalk] High tension lines
>
> An interesting tidbit of info: in Manitoba, transmission lines from
> generating stations to major centres are so long, they run them at DC,
> because at 60 Hz they'd be... resonant.
>
> 73, kelly
> ve4xt
>
>
> > From: Alan NV8A <nv8a@att.net>
> > Date: 2006/08/15 Tue PM 12:39:34 CDT
> > To: towertalk@contesting.com
> > CC: Craig Clark <jcclark@wildblue.net>
> > Subject: Re: [TowerTalk] High tension lines
> >
> > Perhaps somewhere in my collection of clippings I still have the article
> > I found many years ago in the reputable UK _Wireless World_
> publication
> > (which has since changed its name, I think). I don't recall the author's
> > name, but he argued that the confusing findings in studies of possible
> > correlation between proximity to HV lines and the incidence of cancer
> > was due to the failure to distinguish between 50Hz transmission
> systems
> > and those using 60Hz. Somewhere between those frequencies, he
> argued,
> > was some crucial turning point in the effect on the human body.
> >
> > Alan NV8A
> >
> >
> > On 08/15/06 06:30 am Craig Clark wrote:
> >
> > > With all due respect, there has not been a correlation of cancer to
> > > high tension lines. In 1979, Brodeur wrote "The Zapping of America"
> > > where he tried to correlate cancers to proximity to high tension
> > > lines and electrical substations. He followed up with several other
> > > long screeds in the New Yorker Magazine on the same subject. All
> were
> > > long on emotion but short on science.
> > >
> > > At Ham Radio Magazine, we supported quite a bit of research on RF
> > > radiation and cancers working with some of the best in the field of
> > > radio and epidemiology. As I remember, this was the area Overbeck
> > > was most concerned about due to his activity on the VHF/UHF
> > > bands. What we found was that non-ionizing radiation was unlikely to
> > > cause any form of cancer. This is what you have around power lines
> > > and HF amateur radio stations.
> > >
> > > I know nothing about the medical reasons of susceptibility to
> > > cancer. I do know that Brodeur was manipulating facts to prove his
> point.
> > >
> > > Finally, I personally would not locate my ham station anywhere near a
> > > high tension line.
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