[ICOM] Display interference issues

[Larry Winslow]

Back in my CRT days, I too experienced noise from the CRT and/or Computer. 
I found that running a heavy copper wire from the chassis of the computer 
to the central grounding point I had for the rig completely eliminated all 
of the noise.

73 - Larry WØNFU
larry_w at comcast.net


At 09:14 AM 4/4/2005, you wrote:


>How interesting that this topic comes up now. For years I've been putting 
>up with birdies and buzzes on the higher frequency HF bands that I knew 
>was caused by the computers in my shack. I have two PCs very close to my 
>Icoms. I was working 20 meter CW Sunday and decided that enough was 
>enough. Thus began my search and destroy mission.
>
>When the smoke cleared, I had found that my primary PC was radiating QRM 
>via its video output and one of two displays were creating serious QRM. I 
>eliminated the PC-radiated buzzing by wrapping an entire 7 foot long VGA 
>extension cable around the ferrite core of an old TV yoke (trashed TVs are 
>useful for something!) The choke hangs off the back of the PC tower.
>
>The QRM caused by my 19" conventional CRT display could not be eliminated 
>using any typical external technique. I had no interest in opening the 
>display and modifying it. I decided to make my second PC display, an NEC 
>LCD1712 LCD display my primary display. With the LCD display and "choked" 
>VGA output all birdies and buzzes were GONE!
>
>The LCD display did not produce any QRM by itself.
>
>The second PC does not generate any QRM by itself. It's a bit newer and 
>has an integrated video adapter vs. the separate video adapter of the 
>primary PC. The second PC now has the noisy CRT display (for only a few 
>more days!)
>
>I placed an order with an online vendor for a new Samsung 19 inch LCD 
>which should be here in a few days. Until then I only use the second PC as 
>needed to keep the QRM manageable. The 19 inch LCD will become my primary 
>display and the 17 inch display will go back to its original machine.
>
>Meanwhile, the bands are quiet and the Icom receivers are happy.
>
>73,
>
>Frank N. Haas KB4T
>Florida
>
>
>----
>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>Icom Users Net: Sundays, 1700Z, 14.316 MHz
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>
>