I see the same extra stripe using mixw and an RF generator. I had to turn
down the line out of the K3 to 001 and crank up the sound card to max
inorder to eliminate it. The level is a bit weak now and needs more gain.
There is something not quiet right here.
Steve Ellington
[EMAIL PROTECTED]
----- Original Message -----
From: "Jim Brown" <[EMAIL PROTECTED]>
To: <elecraft@mailman.qth.net>
Sent: Friday, August 08, 2008 1:19 PM
Subject: Re: [Elecraft] Re: K3 Audio
On Fri, 08 Aug 2008 09:30:55 +0100, Andrew Forrest wrote:
It appears that this effect is nothing to do with clipping or
transformer saturation but some kind of mixing.
I'm also not convinced that this particular screen shot is non-
linear distortion. It could be aliasing in the FFT software that's
part of the decoder.
On the other hand, the pdf below DOES show both harmonic distortion
and IM distortion on the Line Output when the Line Out level is set
too high (driving the transformer being driven beyond it's ratings).
http://audiosystemsgroup.com/K3FilterStudy.pdf
73,
Jim Brown K9YC
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