I might be especially inclined to suspect the network cables.  They are
long, and not always shielded as well as they should be.  If the shield
isn't great, they could represent a better radiator than most of the other
cables.  Can you temporarily disconnect the machine from the network and
see if that makes any difference?  Perhaps some combination of better
shielding, grounding and ferrite can be helpful here.  Unfortunately, when
I've tried to use ferrite in the past, I've had trouble getting enough
inductance to really block signals in the MW and HF spectrum.  If
disconnecting things doesn't identify the problem, then I'm betting on the
power supply.

Like I said before, I wish you luck.  That sounds like it will be a sticky
problem to arrest.

73, de Lou K2LKK

At 09:02 AM 4/20/02 -0700, you wrote:
>Hi Lou,
>
>We tried turning off the monitor and the result was the same.  The next
>thing to try is ferrite cores on the cables.  The only things hooked up to
>the computer are: a montor, keyboard, mouse and network cables.
>
>Russ
>----- Original Message -----
>From: "Louis Kim Kline" <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Saturday, April 20, 2002 7:48 AM
>Subject: Re: Removing computer interference from radio
>
>
> > Hi Russ.
> >
> > There are numerous sources of interference that can be generated from a
> > computer.  A good place to start is to turn the monitor off and see if the
> > noise goes away.  Some monitors generate a lot of noise.  Sometimes
> > changing the video signal cable can make a big difference.  I experienced
> > that with a NEC monitor that I used to have.  You can try using ferrite
> > cores on the cables coming out of the computer, although I've had rather
> > dubious results.
> >
> > I also had a computer that had a rather noisy SCSI controller, and a leaky
> > SCSI cable.  Changing the SCSI cable went a long way towards reducing the
> > noise output.
> >
> > I have found that sometimes the switching supply in the computer can
> > generate a lot of crud also.  If this is happening, there isn't much you
> > can do about it short of replacing the supply with a better one.  The
> > bottom line is, this probably won't be easy to knock out.
> >
> >
> > Quiet computers are hard to find.  I usually hang on to them with a death
> > grip when I find one.  I cannot get this one that I am typing on anywhere
> > near a radio or television because it has one of those noisy switching
> > supplies.
> > 73 and good luck, de Lou K2LKK
> >
> >
> >
> > At 08:30 AM 4/19/02 -0700, you wrote:
> > >Does anyone have any ideas on how to remove computer interference from
>the
> > >radio?
> > >
> > >Russ
> >
> > Louis (Kim) Kline, A.R.S.  K2LKK
> > e-mail:  [log in to unmask]
> > Work e-mail:  [log in to unmask]
> > Work Tel.  (585) 697-5753
> >

Louis (Kim) Kline, A.R.S.  K2LKK
e-mail:  [log in to unmask]
Work e-mail:  [log in to unmask]
Work Tel.  (585) 697-5753