On 2/21/2020 6:12 PM, Lyn Norstad wrote:
In Chicagoland, all wiring must be in conduits, and both the
kitchen and the shack are on their own circuits. In fact, the only 'home
grown' RFI I am aware of is 1 out of 4 identical HP 24" LED monitors that
puts out a steady carrier on 30 meters.
Having lived in Chicago for 42 years and maintained an engineering
consulting practice there for 30 years, and as a former member of IBEW
134, I'm well aware of the conduit requirement. :) Indeed, I had a lot
of conduit installed in the 2-flat I bought on the North Side in 1986.
Which is also why I added the phrase "the nature of electrical wiring in
your home also matters." The large sound systems I designed and
specified used miles of conduit for both power and signal wiring. When I
moved to W6 in 2006, I had the outbuilding that would become my shack
and consulting office wired with EMT before I moved in.
Several other points here. First, RFI is generally NOT conducted on
wiring from one piece of equipment to another, it is radiated by wiring
from one piece of equipment to another. And it is often present on, and
radiated by, the equipment ground conductor (the green wire). Properly
installed conduit (continuous and bonded at every junction and at both
ends) provides shielding, and prevents radiation.
Second, when I operated in Chicago, my noise level was fairly high, with
contributions from my own home, my tenant who lived below me, the homes
that surrounded mine, Newark's corporate office building at the end of
my block, whatever was on power lines, and trains on the Northwestern
track across the street. With that noise level, usually in the range of
S6 to S8, it would be pretty hard to notice yet another noise source 50
ft from my antennas.
73, Jim K9YC
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