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]
