AmateurRadio.com

RFI Friday night

My last post dealt with my PC monitors causing me some grief in the form of RFI to my K3. On Saturday I spent most of the day spinning my wheels trying to find a way to lesson or better yet cure the RFI problem. Below is what I had tried to in order to fix the problem.
1. I changed out the video cables and wrapped them with chokes as well.....did nothing.
2 Moved the monitors to other locations on the operating desk...that was loads of fun and it too did nothing.
3. Tried running the K3 just off battery power and.... nothing.
4. Ran the monitors from the 12 volt Astron power supply and again nothing.
5 Put snap on chokes on ALL cables coming out of PC and the ALL cables from each monitor.....NOTHING!
6. Even tried tin foil on the back of the monitor and grounding it...only made monitor look sci-fi.
7. Put 1:1 balun on the coax coming out of the K3 and still had problem.
8. Tried my Elecraft K2 (maybe just a K3 problem) found same issue with K2.

Sunday...not to bad

9. Plugged monitors into separate AC outlets on different circuits and did not fix issue.
10. Ran a ground up to each monitor and video card on the PC (PC is already grounded) and nothing.
11.Repositioned screen to see if that made any difference I thought it did but turned out not to.
 So that was how my Saturday was spent and from doing all the above I was able to find out a few things that I hope may ring a bell on how to solved the RFI isssue
1. As I move my hand closer to the monitor the RFI increases.
2. When the rig is on the dummy load the RFI is gone.....but so is everything else regarding signals.
Now it's Sunday and I have come to the understanding that I am going to just have to live with the problem. I know where it is coming from that sometimes that is half the battle! I am going to do some reading and thinking about the issue. I came into the shack to just roll the desk back up against the wall and tidy up the room. I then turned on the K3 along with the PC and for some reason the RFI is still there but not as much at all!!! Seems doing nothing is doing something!!
Mike Weir, VE9KK, is a regular contributor to AmateurRadio.com and writes from New Brunswick, Canada. Contact him at [email protected].