Many of the pc power supplies used in the clones
have minimal or no filtering inside them,
once they get the contracts, they strip them down,
eliminate filters and add jumpers to them.


Win wrote:

I worked for weeks to get the RFI out of my computer. It was coming
from within a commerical RFI protected case. I had S-9 plus readings
on 40 and 80 meters. When I finally turned my attention to AC power
cord and filtered it, levels dropped into the normal band noise.

win w0lz