[RFI] Advice for LCD cmptr RFI

[Bob Turner]

>From the PC, try changing refresh rate and/or screen resolution.  You may 
find that interfering signal decreases.

Bob

-----Original Message----- 
From: Dirk Hacker
Sent: Sunday, December 26, 2010 4:49 PM
To: rfi at contesting.com
Subject: [RFI] Advice for LCD cmptr RFI

Hello all,

I have RFI from my LCD computer display that I can't seem to eliminate.

The LCD generates RFI noise at 60Khz-75-Khz intervals at higher freq's  (10m
band of 28-30KHz.)

I have put "clamp-on -type" ferrites on the LCD cable (one on each end), 
however
they don't supress the RFI

what other things should I try specifically to supress RFI in 28-30MHz ?
(might I just have the wrong type mat'l in the ferrites to supress higher 
freq's
?)
---------------------------------------------------------------

-  I have a CE compliant LCD  (display itself is quiet)
-  The noise goes away if I unplug the video cable
-  Using 12foot long cable to the LCD  (6ft on LCD & 6ft extension cable; 
LCD
cable has small ferrite molded on it)
-  computer has 512MB PCI video card that can drive 2 displays (PNY company)
-  Changing the refresh rate of the LCD (in display properties) does not
eliminate thew RFI)
-  noise is not generated by the P.S.  ;  I installed a AC-line fitler to 
keep
the PS quiet (corcom 6ef1f)

-----------------------------------------------------------------
Thanks for your thoughts and comments about this.

Dirk H
KE7WVZ - Phoenix, AZ



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