Monitor Noise

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Monitor Noise

Mark - W5EZY
After the discussion on computer noise, I was reminded
that I have a problem with noise generated by my
Viewsonic crt monitor.  I use my computer for logging,
so it has to be on when I'm on the air.  Does anyone
have any ideas on how to reduce/eliminate this type of
noise?  I thought about making some kind of ground
sheild inside the case of my monitor, but that might
create a cooling problem.  Ideas?

73,
Mark Baugh
W5EZY
Grenada MS


               
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RE: Monitor Noise

Don Wilhelm-3
Mark,

The best solution that I can offer is to replace it with a TFT (LCD)
monitor.  Takes up a lot less space on the operating desk and does not
generate so much trash in the RF spectrum.  I suffered from the same thing
for a long time and finally just bit the bullet and bought one - I have been
very pleased.

73,
Don W3FPR

> -----Original Message-----
>
> After the discussion on computer noise, I was reminded
> that I have a problem with noise generated by my
> Viewsonic crt monitor.  I use my computer for logging,
> so it has to be on when I'm on the air.  Does anyone
> have any ideas on how to reduce/eliminate this type of
> noise?  I thought about making some kind of ground
> sheild inside the case of my monitor, but that might
> create a cooling problem.  Ideas?
>
>

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RE: Monitor Noise

Jim Sheldon
Hi Mark,
I have to echo W3FPR's advice.  I had a Viewsonic monitor myself, and I DID
shield the inside, put ferrites on the VGA input cable, put chokes, ferrites
& capacitors on the AC input as well, and didn't even manage to reduce the
radiated noise.  I suspect it's coming from the CRT itself.  You will most
likely spend more money trying to fix that monitor than you would buying an
already shielded one or a TFT LCD one.  Personaly I like the LCD monitors
(don't get a plasma screen monitor as some of them radiate worse than the
viewsonic), but haven't been able to afford one yet.  I'm using the Dell
monitor that came with my computer, and whoever manufactures them for Dell
did an excellent job of shielding this one as I don't have any noticeable
radiation that I can find in any of the ham bands.  There is a little
garbage appearing around 12 MHz that I can attribute to the monitor, but
even there it's attenuated enough that you wouldn't notice it unless the
atmospheric noise was very low.

Jim - W0EB


> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Don Wilhelm
> Sent: Monday, November 21, 2005 9:21 AM
> To: Mark Baugh; Elecraft Reflector
> Subject: RE: [Elecraft] Monitor Noise
>
>
> Mark,
>
> The best solution that I can offer is to replace it with a
> TFT (LCD) monitor.  Takes up a lot less space on the
> operating desk and does not generate so much trash in the RF
> spectrum.  I suffered from the same thing for a long time and
> finally just bit the bullet and bought one - I have been very pleased.
>
> 73,
> Don W3FPR
>
> > -----Original Message-----
> >
> > After the discussion on computer noise, I was reminded
> > that I have a problem with noise generated by my
> > Viewsonic crt monitor.  I use my computer for logging,
> > so it has to be on when I'm on the air.  Does anyone
> > have any ideas on how to reduce/eliminate this type of
> > noise?  I thought about making some kind of ground
> > sheild inside the case of my monitor, but that might
> > create a cooling problem.  Ideas?
> >
> >
>
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Re: Monitor Noise

K3yt
In reply to this post by Mark - W5EZY


I have to second that.
 
I was using a gateway monitor, but went to the Dell 17".
 
Virtually no noise.
 
They are made by Phillips.
 
73, Bob K3YT
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Re: Monitor Noise

Nick Waterman
In reply to this post by Jim Sheldon
> (don't get a plasma screen monitor as some of them radiate worse than
> the viewsonic)

If you think about how they work... They're pretty much a giant, flat,
modulated spark gap transmitter, aren't they?   :-)

http://electronics.howstuffworks.com/plasma-display3.htm
(and the next page)

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"Nosey" Nick Waterman, Senior Sysadmin.
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The world's coming to an end. Log off and leave in an orderly fashion.
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Re: Monitor Noise

Vic K2VCO
In reply to this post by Don Wilhelm-3
Don Wilhelm wrote:

> The best solution that I can offer is to replace it with a TFT (LCD)
> monitor.  Takes up a lot less space on the operating desk and does not
> generate so much trash in the RF spectrum.  I suffered from the same thing
> for a long time and finally just bit the bullet and bought one - I have been
> very pleased.

I agree.  Recently I had to buy a new computer for my XYL, who already
had a flat-panel monitor.  Dell offered a nice one for $100 with the
computer, so the old one ended up in my shack.  It definitely is more
RF-quiet, as well as being easier on the eyes.

Having said that, most of the noise from CRTs is radiated by the cables.
  I would wrap as much of the power cord and video cable as possible
around big ferrite cores.  If your problem is mainly on 160 or 80 meters
you might best use the 43 mix, which is more effective at low
frequencies.  Simple snap-on beads are ineffective at HF.  My attempts
to shield the whole monitor with aluminum foil, etc., also did not
produce good results.

--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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RE: Monitor Noise

Jason Marten
In reply to this post by Mark - W5EZY
Try changing your CRT monitor's refresh rate first.

If you're using Windows, right click on your desktop to bring up the Display
Properties dialog.  Choose the Settings tab, and click on the Advanced
button in the lower right.  Under the Monitor tab, try choosing different
settings under Screen refresh rate.

You may have to lower your screen resolution to get more refresh rate
options.  There's a little slider on the same dialog with the Advanced
button.

This may or may not work, but it's worth a try before buying a new LCD
monitor.  But the LCD monitor should probably do the trick if that doesn't
work.


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