I hear KFI all day on our telco plant, especially on an ungrounded NID at a house or at an ungrounded crossbox on a wood pole. 50,000 watts from an antenna about 10 miles away in La Mirada, CA. I swore I heard AM radio in my head sometimes when I wore braces....maybe I was nuts...maybe not?
My last job was maybe 2 miles from TWO 50kw stations, and on a mud-flat swamp area the antennas also are.
They were a mile from each other, and one was on 720, other 780, that's a 60 khz difference.
We had quite a few systems with weird quirks, especially when their wires went all over the plant.
One production reporting and load counting system had lights that told operators when a pallet was "full", and to replace it with a new one. When one particular line, (with really good grounding), turned on this light,
EVERY machines' production speed (as monitored) went up by about 50%, as long as that light was on. I found lots of 60khz in the wiring.
Tried 20 different ways to filter, block, etc.
Only thing that worked was remote relays, and only when powered by the machine in question. When I began looking, 60khz was in almost everything!
God bless 'em, it's all their headache now.
So happy to leave these enginnering issues behind and let em see if their "technicians"
can deal with it.
Haw, haw, haw.
