[Elecraft] RFI With KPA500 Full Output on 40m

[Mike Cox]

I had similar issues over the years with my GFI receptacles. I put 
ferrites on the power leads both at the receptacles and in the main 
distribution panel but was only able to reduce the problem and/or move 
it to other bands. I then tried different brands of receptacles and, 
after trying everything from Lowe's and Menard's, finally found that the 
Leviton brand GFI receptacles (I found them at Home Depot) completely 
eliminated my problems.

Mike - AB9V

On 3/18/2012 10:05 AM, Jim Sheldon wrote:
> For some reason, probably resonant length of coax or something, plus the 40 meter dipole runs directly over the house and parallel to the incoming power service, Every time I key a rig with more than about 50 watts, I trip every GFI outlet in the house.  I haven't found enough big snap-on ferrites to hit all the romex coming out of the panel, but when I do, I'll certainly put 'em on.  A really big one that would snap around the incoming line at the panel would be nice, but so far I haven't found a source of snap on's that I can afford.  Not sure either on what material would be best for that.
>
> Jim - W0EB
>
>>> When I crank my KPA500 up to full output on 40 meters, I get RFI
>>> on my
>>> home security system. Lights up all the remote panel lights and
>>> beeps.
>>> Luckily it does NOT set off the alarm. If I back off output to
>>> 350 watts
>>> or so, no RFI problem. Both ends of my RG-8 coax have ferrite
>>> chokes. This
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