Tom, If all the other suggestions mentioned do not solve your problem, consider this. I had some noise show up here at home that I first noticed on the A M broadcast band. After some investigation I tracked it down to a P C's power supply. That computer had been here for years and suddenly started this problem. A trip to the computer parts store netted me a new power supply. Less then 10 minutes later and $40 poorer, the problem was solved. Power supplies are mounted with 4 screws and all the cabling are plug-in type connections so the swap-out is a piece of cake. Unless you have some super compact unusual computer, most power supplies are fairly standard. Is this a mini tower type computer? If so, it should be a standard type ATX style power supply. There will be a power connection to your hard drive, CD/DVD drive, and possibly 1 or 2 to the motherboard, that's all there is to it. I have built about 6 computers over the last 10 or so years. You can do it. Howard #3 ----- Original Message ----- From: "Tom Behler" <[log in to unmask]> To: <[log in to unmask]> Sent: Friday, November 15, 2013 7:30 AM Subject: Anoying Interference Issue > Hi, all. > > As I think many of you know, I am currently in the process of switching to > a > Windows 7 PC as my main home computer. I will be using the PC for both > professional and personal purposes here in my home office. > > My home office is also where I have my ham station set up, which does have > its advantages if I need to take a little break and check out the bands > every once in a while. (grin) > > Anyway, I have just noticed that when this new computer is running, it > places all sorts of little birdies across the HF bands, particularly the > higher HF bands like 10 and 15 meters. > > To me, this obviously means that the computer has a very poorly-designed > switching power supply. > > My question is what might I be able to do to minimize this interference? > > I have thought of switching the computer to another circuit in the house, > but that would involve running an extension cord into another room, which > could be a bit of a pain. > > If there is a fortunate side to this dilemma, it is that I am not going to > be using the PC for ham radio applications such as logging, rig control, > and > the like. Those functions are done via a separate Windows XP laptop that > I > have on my ham radio operating desk. > > Of course, the obvious low tech solution to this issue would simply be to > turn off the main PC whenever I am operating on the HF bands, and I may > have > to resort to that for now. > > If, though, there is something else I might want to try, please let me > know. > > Tom Behler: KB8TYJ