[digitalradio] I've got some computer interference!! :(

[darylyng]

I have a 1:1 audio isolation transformer between my radio and the 
computer, which does a fine job until I get to around 11Mhz or the 20 
meter band. In experiments, the radio interference dissapears when I 
disconnect the radio from the computer. Could I perhaps use a .01mF 
capacitor in series on both the center and shield of the output line to 
further isolate the radio and computer? Or is there a better way?