[Don Pearce[_3_]]

On Sat, 14 Jul 2012 09:45:27 +0000, John L Stewart
wrote:


Coincidentally, I discovered that one of my RF noise problems, in
addition to this location being an RF nightmare, was one of my PCs.
The dern thing splatters RF all over the place even when turned off, I
have to pull the plug to get it off the air, so I guess the power
supply is going out. Fortunately it's not the server.

It is the switch mode PS that generates lots of RFI, wether the PC is on
of off. Not unusual at all. I found similar problems while testing some of
my experimental AF amps in the past.

Cheers, John


I frequently have to carry out RF approvals work on products, and this
is the situation I have found. PC power supplies get designed, for the
most part, quite well, following the chip manufacturer's application
note. The power supply is then given its EMC approval.

After that, knowing that the thing will never be looked at again, half
the suppression components are removed from the PCB. Take the lid off
yours and see how many bits are not fitted. The best thing you can do
is go into the after-market and find a decent replacement.

d