"Tian_Li" wrote

(good references for quiet equipment, thanks), and:

Use a dedicated ground power outlet for your computer.

Unless you have a 1-radio "station" and no lightning protection of any kind,
this is a very bad choice.

It is also an expensive undertaking, requiring both a dedicated power
circuit *and* independent grounding. It's a favorite gimmick of audiophiles
but with limited results unless you have noise problems that can't be
corrected by repair or replacement of the offending emitters. While the
audiophile can experiment like that to his heart's content, communication
systems should *never* use independent grounds. That means everything in the
shack. All of our grounding *must* be bonded, and that means either fixing
or avoiding the use of noise emitters in the first place. For the computer,
keep interconnecting data cables away from the coax feedlines, and place RF
chokes on all power and data cables at both ends. That handles signal noise.
The computer's casing provides all the shielding that device should ever
need.

Jack