[RFI] Putting Toroids on the Service Lines

[Cortland Richmond]

I got hold of a couple of Corcom 3 phase 200A filters and have been 
thinking about running one single phase.  IIRC that would require 
derating to 100A, plenty for my service, and as long as the meter 
doesn't read reactive current...


Cortland
KA5S

On 1/28/2013 1729, Jim Brown wrote:
> 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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