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Re: [RFI] Computer monitor RFI

To: rfi@contesting.com
Subject: Re: [RFI] Computer monitor RFI
From: "N6KJ" <kelly@thejohnsons.ws>
Date: Fri, 07 May 2004 13:27:57 -0700 (PDT)
List-post: <mailto:rfi@contesting.com>
Good luck.  So much for the FCC's Part 15 radiation limits!  As all of us
around here know...they're nowhere near sufficient to prevent interference
to HF users. 

Your first mistake was buying Sony.  It's pretty much well known around here
that Sony (televisions esp.) is one of the worst vendors in terms of

Your best bet is to junk it and get a new monitor.  Find one that doesn't
cause this type of problem.

BTW, I have the same problem with a ViewSonic 21" monitor.  Fortunately,
the noise "birdies" are about 30 or 40 Khz apart so I usually just turn
the monitor off if I'm trying to hear a station at the "birdie" frequency.
Nothing I've tried seems to eliminate the noise.  It's about S7 or S8
for me.  Ferrites on the video line AND AC line didn't cure it.

Good luck.

On Fri, 07 May 2004 14:06:46 -0400, Alan Beagley wrote:

> The Sony 15" monitor connected to the computer I am using with my rig 
> generates an enormous amount of RFI: S9 signals at intervals on 20m and 
> up, the intervals depending on the screen resolution I set. The 
> interference stops if I turn off the monitor or when it blanks after the 
> set timeout interval.
> The video cable has its own integral RFI filter, and I have tried adding 
> a choke to the power cord and an additional one to the video cable, but 
> to no avail.
> Any ideas?
> Alan AB2OS
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