Originally Posted by KE7XD
I have some very bad noise in my shack. The worst is light dimmers in the house.. The shack is fed by four wires to a building about 140 feet away from the house. I put in a sub panel to feed the circuits. The panel box is grounded to the main box in the house, and the neutral is also tied to ground at the house. The new panel box also has ground rods at its site. For noise where should I put some bypass caps, from the legs to neutral or to ground? Should there also be a cap from neutral to ground? For lighting protection it sounds like everything should be grounded to a common point, but can I tie the ground and neutral together? I have read a lot of articles, however I have not come up with suggestions when using the four wires.
Buy some better switches. Most of the newer switches have RFI filters built in.
Shop Lutron Maestro 5-Amp White/Gloss Digital Dimmer at Lowes.com
Also, you might want to invest in some Corcom filters. Depending on how much amperage you use there are several relatively low-cost solutions to help cut down on noise getting into the shack from house mains.
General Purpose RFI Filters
(Used models can be found on EBay and/or you can buy them from electronic supply places like mouser, etc.)
The Corcom filters work great.
Unfortunately, filters won't help you if you have this: http://www.youtube.com/watch?v=8SgW9JjIUac