Shielding NTSC monitor from computer monitor at DVinfo.net

Brian Tori · February 3rd, 2005, 07:21 PM

In my current setup, I have a 13" NTSC monitor set above my CRT computer monitor. The NTSC monitor sits on a shelf about 3" above the computer monitor. When powered up, the NTSC monitor creates electromagnetic interference with my comp. monitor. The interference creates horizontal lines and makes it very hard to read screen clearly. Any ideas to isolate the monitors to reduce this problem? I am considering a piece of sheet metal to slide under my NTSC.

Glenn Chan · February 3rd, 2005, 07:37 PM

You can set your computer monitor's refresh rate to 60hz, although that doesn't really solve the problem and your eyes will hurt when you look at the computer monitor too much.

You can try sliding a sheet of metal in between, but I don't find it helps.

The best thing to do is to move the monitors away from each other, like:
Put them side by side, with a few inches in between
Put a phone book under the NTSC monitor (this may create ergonomics problems when you're looking up too much?).

Or, have a LCD screen between the CRT computer monitor and the NTSC monitor.

Ed Liew · February 3rd, 2005, 07:38 PM

try changing the hz of the pc monitor. sometime it might help.

ed

Jacob Walker · February 4th, 2005, 11:50 PM

I've found that going up high like 100 hert (if video card allows) helps. Usally its workable although if you look close at the monitor it still kinda shakes.

Carlos E. Martinez · February 5th, 2005, 10:22 AM

<<<-- Originally posted by Brian Tori : In my current setup, I have a 13" NTSC monitor set above my CRT computer monitor. The NTSC monitor sits on a shelf about 3" above the computer monitor. When powered up, the NTSC monitor creates electromagnetic interference with my comp. monitor. The interference creates horizontal lines and makes it very hard to read screen clearly. Any ideas to isolate the monitors to reduce this problem? I am considering a piece of sheet metal to slide under my NTSC. -->>>

Do you know if your NTSC monitor has a speaker inside? That is indeed likely to produce eletromagnetic interference.

If not it might be the transformers inside.

A steel or iron sheet metal may improve things a bit, as long as it covers the magnetizing area.

Changing the CRT monitor frequency would also improve things. On my monitor I get better results at 75Hz, but you should try others.

You may also get a mu-metal supplier through Google and get yourself a mu-metal sheet. They might not be large though.

But my stronger guess is an speaker might be causing the problem. If that is the case it might not be easy to solve, only putting the NTSC monitor away until distortion is gone.

Carlos

February 3rd, 2005, 07:21 PM	#1
Brian Tori Major Player Join Date: Nov 2004 Location: Detroit, MI Posts: 408	Shielding NTSC monitor from computer monitor In my current setup, I have a 13" NTSC monitor set above my CRT computer monitor. The NTSC monitor sits on a shelf about 3" above the computer monitor. When powered up, the NTSC monitor creates electromagnetic interference with my comp. monitor. The interference creates horizontal lines and makes it very hard to read screen clearly. Any ideas to isolate the monitors to reduce this problem? I am considering a piece of sheet metal to slide under my NTSC.

February 5th, 2005, 10:22 AM	#5
Carlos E. Martinez Trustee Join Date: Oct 2003 Location: Rio de Janeiro, Brasil Posts: 1,138	Re: Shielding NTSC monitor from computer monitor <<<-- Originally posted by Brian Tori : In my current setup, I have a 13" NTSC monitor set above my CRT computer monitor. The NTSC monitor sits on a shelf about 3" above the computer monitor. When powered up, the NTSC monitor creates electromagnetic interference with my comp. monitor. The interference creates horizontal lines and makes it very hard to read screen clearly. Any ideas to isolate the monitors to reduce this problem? I am considering a piece of sheet metal to slide under my NTSC. -->>> Do you know if your NTSC monitor has a speaker inside? That is indeed likely to produce eletromagnetic interference. If not it might be the transformers inside. A steel or iron sheet metal may improve things a bit, as long as it covers the magnetizing area. Changing the CRT monitor frequency would also improve things. On my monitor I get better results at 75Hz, but you should try others. You may also get a mu-metal supplier through Google and get yourself a mu-metal sheet. They might not be large though. But my stronger guess is an speaker might be causing the problem. If that is the case it might not be easy to solve, only putting the NTSC monitor away until distortion is gone. Carlos

February 3rd, 2005, 07:37 PM	#2
Glenn Chan Inner Circle Join Date: Jun 2003 Location: Toronto, Canada Posts: 4,750	You can set your computer monitor's refresh rate to 60hz, although that doesn't really solve the problem and your eyes will hurt when you look at the computer monitor too much. You can try sliding a sheet of metal in between, but I don't find it helps. The best thing to do is to move the monitors away from each other, like: Put them side by side, with a few inches in between Put a phone book under the NTSC monitor (this may create ergonomics problems when you're looking up too much?). Or, have a LCD screen between the CRT computer monitor and the NTSC monitor.

February 3rd, 2005, 07:38 PM	#3
Ed Liew Major Player Join Date: Oct 2003 Location: Malaysia Posts: 226	try changing the hz of the pc monitor. sometime it might help. ed

February 4th, 2005, 11:50 PM	#4
Jacob Walker Regular Crew Join Date: Mar 2003 Location: Enumclaw, WA Posts: 69	I've found that going up high like 100 hert (if video card allows) helps. Usally its workable although if you look close at the monitor it still kinda shakes.