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