I have a 300KV distribution line about 0.5 miles from my QTH, and have not had any significant issues. About every month or two I walk along two miles of the power line with my KX3 checking for increased noise on various bands that I normally use. Only once in eight years did I hear anything and it was only about 3 to 4dB above my normal noise levels. A week later I checked and didn’t hear it. Could have been the power line or could have been something else.
73, Bob Nobis - N7RJN [email protected] > On Mar 16, 2016, at 16:51, Fred Jensen <[email protected]> wrote: > > Yes, and buried in there is the reason why it is so hard to get the power > company's attention for distribution line noise [12-14 KV] ... the loss to > them is minuscule compared to other costs. > > With no disparagement of power linemen intended, distribution is almost > universally on wood poles if it isn't underground. They're assembled on-site > to more or less standard configurations, and the hardware often reclines in > the back of their trucks exposed to the weather and oxidation for weeks [or > months]. The standard configurations usually require some [or a lot] of > on-site "special engineering" to satisfy the real-time need at a given pole. > > Above distribution voltages the lines are engineered. Towers are built to > fairly exacting standards and erected by professional riggers. If something > is wrong, they go back to the engineers. The power company *does* have an > interest in corona and leakage losses at 100 KV and above. I think that's > why most really high voltage lines are quiet. > > RFI from distribution circuits is really an FCC [or other national comm > regulator] responsibility ... they're incidental radiators under Part 15 in > the US. That said, the K3 NB took out almost all the distribution line noise > I had when we were in CA ... it failed on the CalTrans street lamp, but so > did everything else. :-) I rarely used NR, just couldn't find the sweet spot > to make it effective. > > 73, > > Fred K6DGW > - Northern California Contest Club > - CU in the Cal QSO Party 1-2 Oct 2016 > - www.cqp.org > > On 3/16/2016 4:16 PM, Jim Brown wrote: >> On Wed,3/16/2016 9:08 AM, Scott Ellington wrote: >>> The arcing that causes RFI is usually not from the power lines >>> themselves, but various pieces of poorly bonded hardware NEAR the >>> power lines. >> >> Right. But most engineers would view the lines and that hardware as a >> "power distribution system," and an attempt to separate the two a game >> of semantics. A chain is only as strong as its weakest link. :) > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
