[Elecraft] Computer-noise

[Matt Osborn]

As, Bob suggested, the PC power supply is active. Most newer mother
boards require a 5VDC line that is used to turn on the main power
supply.

Often, there is a rocker switch on the back of the power supply that
will turn off the computer entirely.

On Sun, 20 Nov 2005 16:51:28 +0100, Martin <dm4im at gdxf.de> wrote:

>Hello elecrafters,
>today i wandered through the house carrying the battery-powered K2
>with a vhf antenna connected to ŽsniffŽ for the noise i have on 80 &
>160m. On 160m, snap-on ferrites on 2 network-cables completely
>removed the carriers. On 80m the problem seems to be more
>difficult: The noise is produced by one of 3 Computers in my buro,
>even when it is switched off. The other computers are quiet, also the
>one in the shack.
>The noise becomes a lot stronger when the computer is on, but only
>completely disappears when it is disconnected from the mains.
>Its a raspy carrier slowly sweeping up and down the band.
>
>Any ideas where to start? A snap-on ferrite on the power-cord
>helps a little, but not much.
>
>