K3 picking up "noise" from monitor

[Elecraft mailing list]

This maybe a bit off topic but I recently discover, by accident, that my K3 been picking up noise from my computer monitor which can be seen on the P3-VGA as a 1-2 S unit uptick in background noise on 40 - 80 meters. Turn the monitor off and it drops. The monitor is a Samsung unit and is the only one of the three I have that cause the "inference." Has anyone else experienced this problem? I have tried all the 'usual' fixes, chokes, re-locating coax & cords, etc, and nothing seems to help. Even if the monitor is not connected in anyway to the radio, ie; used with a different computer in the shack, it still causes interference. On thing to note is that this monitor uses a laptop type power supply while my other two monitors run off regular 120v. Not sure if that makes an difference as I use a laptop  and it works with causing no such interference problems. I would appreciate any additional ideas to try and solve the problem.   To save bandwidth here, please respond off line. ([hidden email]) Thanks all in advance,Bill - W0BBI 
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[Jim Brown-10]

On Wed,10/15/2014 9:40 AM, Bill Wiehe via Elecraft wrote:
> This maybe a bit off topic but I recently discover, by accident, that my K3 been picking up noise from my computer monitor which can be seen on the P3-VGA as a 1-2 S unit uptick in background noise

Study k9yc.com/RFI-Ham.pdf  and put common mode chokes on both cables
connected to the monitor.  I would start with 10 turns through a 2.4-in
o.d. #31 toroid. It may or may not fix it.

73, Jim K9YC
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[tomb18]

It worked in my case.

On Oct 15, 2014 1:25 PM, Jim Brown <[hidden email]> wrote:

>
> On Wed,10/15/2014 9:40 AM, Bill Wiehe via Elecraft wrote:
> > This maybe a bit off topic but I recently discover, by accident, that my K3 been picking up noise from my computer monitor which can be seen on the P3-VGA as a 1-2 S unit uptick in background noise
>
> Study k9yc.com/RFI-Ham.pdf  and put common mode chokes on both cables
> connected to the monitor.  I would start with 10 turns through a 2.4-in
> o.d. #31 toroid. It may or may not fix it.
>
> 73, Jim K9YC
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft 
> Help: http://mailman.qth.net/mmfaq.htm 
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net 
> Please help support this email list: http://www.qsl.net/donate.html 
> Message delivered to [hidden email]

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