Thanks for that info.  Yes, we can temporarily disconnect the cables from
the network.  What would be the best way to determin if it is the power
supply?
The interesting thing about this, my brothers old computer didn't create all
of this noise!
----- Original Message -----
From: "Louis Kim Kline" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, April 20, 2002 5:48 PM
Subject: Re: Removing computer interference from radio


> 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
>