Paul/N1BUG, I found that replacing the AC connector of the computer p/s with a CorCom 6EF1 line filter works getting rid of the RFI/hash from the switching p/s which is most likely the problem. They are the solder type I believe and fit right into the AC socket hole of the computer p/s. Took out all the RFI in the HF/6m bands ! Tom/k1tl...