On 1/28/2013 2:12 PM, Aaron Kreider wrote:
How crazy of an idea is it to put toroids on the incoming service AC
lines?
Having done considerable research on the use of ferrite chokes to
suppress RFI noise, it's one of the LAST things I would bother to do,
except under very unusual circumstances. When I lived in Chicago, the AC
line was an twisted triplet (120-0-120) with bare neutral, about 80 ft
long, that ran about 20 ft below my wire dipoles, and more or less in
parallel. I put about six 2-inch long, 1-inch i.d. #31 clamp-ons on
that feeder, hoping that it might minimize the common mode trash coming
radiating from that section of the power system.It have helped by a dB
or two on some bands, but I was never convinced that it did anything
useful.
73, Jim K9YC
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