[RFI] computer screen rfi

Jim Brown jim at audiosystemsgroup.com
Fri Dec 23 03:30:59 EST 2016

Hi Kostas,

Two possibilities. 1) Direct radiation from the computer or the display. 
2) Radiation from the cables connected to the computer or the display or 

Easy fix for #2 -- see k9yc.com/RFI-Ham.pdf and the applications note on 
k9yc.com about killing receive noise.  Multi-turn ferrite chokes on the 
cables. No easy fix for #1 -- it's a design defect of the 
noise-generating product. You've got to junk one or the other, depending 
on which is the culprit.

73, Jim K9YC

On Thu,12/22/2016 11:39 PM, Kostas SV1DPI wrote:
> Hello to all and Merry Christmas
> We have a problem in my club's station. When I turn on the computer's 
> screen everything is ok in our Kenwood 950. When I run VE7CC's cluster 
> program I can see 3 s-units noise. I thought that it was because of 
> the white colour but this does not happen if I open painting which has 
> also a white colour as background. Any ideas where is the problem?
> ...73 de Kostas SV1DPI
>   (One of SZ1A-EP6T)
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