[Elecraft] K3 Audio our artifacts

[Jim Brown]

On Mon, 02 Mar 2009 18:58:58 +0000, Brian Alsop wrote:

>I'm wondering about a UPS supply that's attached to the computer.   Do 
>they only kick in when power goes out 

That is nearly always how they work. BUT -- if the transformer is 
energized, there will be a field. So it depends on how that particular 
device works. 

>Have the opposite problem with earphones clean but line out polluted by 
>third and other odd harmonics.

That's produced in the line out transformer because there's 600 ohms in 
series with it and the output driver. The mod fixes that by reducing the 
resistors to a much smaller value (50 ohms, I think). 

73,

Jim Brown K9YC