If you can run your radio on battery then kill the entire house at the main. If it is still there then you are in trouble. If it stops do a binary search for the circuit. Turn on Half and if not then turn that off and turn on half of the other half, etc.. When you find the circuit you are on you r way. I think it is outside the house. Does it stop if you remove the antenna? That can also give some hints.
Gil, W0MN http://webpages.charter.net/gbaron N 44.082147 W 92.513085 1050' Hierro Candente, Batir de repente _____ From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Rodney Sent: Saturday, March 22, 2008 10:26 AM To: digitalradio@yahoogroups.com Subject: Re: [digitalradio] RFI-Free PCs? Bill, I haven't been following this thread, but THANKS! You've answered several questions that "I" had! Now I have a question: I have an 11-meter rig in my shack (Sorry guys, but I started in CB LONG before I became a Ham and that was in 1981) that has HALF SCALE noise! I also have the same problem with my 10-meter rig! So basically, they are both useless! I've turned off all my cordless phones, computers and anything else I can think of that would cause this, but it still exists. I live in a residential area so there are houses all around me. I'm HOPING that the problem is in MY house and not in someone else's house, that way I can locate and fix the problem! Any ideas on WHAT could be generating this noise? Rod KC7CJO Bill Turner <[EMAIL PROTECTED]> wrote: ORIGINAL MESSAGE: On Fri, 21 Mar 2008 23:17:22 -0400, Tony <[EMAIL PROTECTED] <mailto:DXDX%40optonline.net> net> wrote: > >Need to replace the PC in the shack and would like to find something >that's RFI-free out of the box. ------------ REPLY FOLLOWS ------------ What kind of RFI? RFI caused by the computer and picked up by your receiver or RFI caused by your transmitter and picked up by your computer? A couple of general observations: The first kind is caused mostly by the monitor, not the computer. Going to an LCD monitor, as you are, will cure most of that kind. The second is more difficult, but try to have the computer and transmitter physically close together with the two chassis bonded together with a short ground wire. Without that bonding wire, your interconnecting wiring creates a sort of small loop antenna. The bonding wire shorts it out. And best of all, if you can, is keep your antenna as far away from your equipment as possible, and use coax feedline instead of open wire. Use a balun at the junction of antenna and feedline to prevent current from flowing on the outside of the coax. Such current flows as a result of unbalance in the antenna system and is a major cause of RF-in-the-shack syndrome, which in turn is a major cause of computer RFI. 73, Bill W6WRT _____ Never miss a thing. Make Yahoo <http://us.rd.yahoo.com/evt=51438/*http://www.yahoo.com/r/hs> your homepage.
