[RFI] ARRL to FCC...

[Jim Brown]

On 3/25/2014 11:49 AM, Dale J. wrote:
> Once when I had access to the TV, I tried one of those outlet strips with filtering and it made no difference

I would not expect it to. They only affect the differential mode signal. 
As Ed has noted, the signal can be radiated common mode on the power 
cable, on an antenna (or CATV) cable, and even on cables connected to an 
A/V rig. If it's common mode, you need serious mutli-turn ferrite 
chokes, not "filters." Below 7 MHz, Fair-Rite #31 is the weapon of 
choice. Above 10 MHz, #31 is still quite effective, but #43 is slightly 
better. See my choke cookbook for some winding guidelines. Luckily, I've 
yet to encounter a plasma set, but there was a report, I think on this 
reflector, from a ham who had pretty good suppression with a choke on 
the power cable.

It's also possible for RFI to be radiated from wiring internal to the 
set, and chokes won't help with that mechanism.

73, Jim K9YC