[TowerTalk] Computer RFI

[k6xyz]

Yep....I have exactly the same problem right now on this computer.
Mine has a rocker switch on the rear panel and with the computer shut off, I
still have noise until I shut off the rocker.
I have a UPS also that make a slight noise but nothing like the computer
does.
I noticed this problem earlier this year and have been ignoring it....it's
on the 2 do list..hehe

Regards

Dave Harmon
K6XYZ[at]sbcglobal[dot]net
Sperry, Ok.

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Clive Whelan
Sent: Wednesday, November 22, 2006 6:09 PM
To: Jim Miller WB5OXQ; TowerTalk at contesting.com
Subject: Re: [TowerTalk] Computer RFI

Jim

If you are saying that the noise does not quit when you
switch the computer off, but DOES so when you unplug from
the wall, then it's open and shut, and is due to the switch
mode power supply. Very poor engineering practice is used in
computers, and they are almost never dissed from the mains
until the plug is pulled.

The cure is pretty straightforward, viz replace the PSU,
which is a screwdriver job. You will of course need to get a
recommendation from someone who knows a clean third party
PSU. Sorry can't help from this side, but I did have to do
exactly as I state above on my own (generic) machine. e.g. a
Dell is unlikely to be a problem.

The problem would be worse if you are e.g using tuned line
to the antennas, as opposed to coax feed.


73


Clive
GW3NJW

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com]On Behalf Of Jim
Miller WB5OXQ
Sent: 22 November 2006 22:20
To: TowerTalk at contesting.com
Subject: [TowerTalk] Computer RFI


I am getting a lot of interference on the low bands from my
pc but from 20 meters and up there seems to be none.  The
noise is very wideband and does not stop unless I unplug the
computer from the ac outlet.
Ideas?  My dimmers cause me no problems at all..My garage
door opener has a birdie of a kind on 2 meters also..
      Jim & Ella Miller
WB5OXQ & KA5EPM
     Abby & Sparky
Dalmatian Furbabies
        Waco, TX
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