For many years my wife's treadmill caused strong interference on 160 meters when it was in use, and yesterday I was able to completely eliminate the RFI using a combination of two different filters (a commercial line filter that provides both common mode and differential mode filtering, and 14 turns of the power cord on a 2.4" OD Fair-Rite #31 mix toroid core based on the K9YC hams guide to RFI document).
I created a simple website that documents my tests and the filters used, and for those interested the website URL is http://sites.google.com/site/treadmillrfi/ The website contains a link to a video on youtube where you can actually see the effectiveness of the filters. 73, Don (wd8dsb) _________________ Topband Reflector Archives - http://www.contesting.com/_topband