[RFI] Sudden Computer Racket

[Jim Brown]

On Fri, 25 Jun 2010 07:31:13 -0400, Pete Smith wrote:

>Looking with a spectrum analyzer program and a 
>broadband SDR, I can see that the noise consists of peaks at 48-KHz 
>intervals, 

That does sound like the sound card is misbehaving and creating that noise. 
48kHz is probably the sampling rate. Are there any cables connected to it 
(like audio ins and outs)?  Try removing them and see if the noise goes away. 
If it does, chokes could kill the noise. 

73, Jim Brown K9YC