On Wed, 03 Jan 2007 16:02:14 -0800, Mike Chambers
wrote:

I have an Eton E5 which I connect to my laptop via the Line Out on the
Eton to the Line In on the laptop.

This works great for recording shortwave broadcasts, but if the laptop
is plugged in, it generates some interference on the radio (only when
they are connected via lineout / in). If I unplug the laptop, there is
no interference.

Does anyone know if there is anything I can do to get rid of the
inteference? I want to set up my machine to record programs overnight,
so I can't leave the laptop unplugged.

mike

http://mesh.typepad.com

Is your laptop battery weak where it is always charging? This would
overheat the supply and generate more rfi.

We had a Dell with this problem at work. We used to plug the power
supply into a 110 volt isolation transformer and then we connected a
ground lead to the ground side of the speaker jack on the computer.

Another alternative is to replace the laptop power supply with another
brand which hopefully will not be as noisy.

Jim