[Elecraft] K3 Audio line output linearity problem

[AD6XY - Mike]

I was using the K3 with a CW decoding program to try and copy some of the
people transmitting at 40 WPM at the lower end of 80m tonight. I had the
spectrum view active and I noticed with the CW filter tuned to 600Hz with
150Hz bandwidth I could also see a spurious signal at 1800Hz and a weaker
one at 1200Hz. I.e.  the harmonics. Further investigation with spectrum lab
showed the 1800Hz harmonic was only 50 dB down.

This was using the line out. The speaker out and phones out did not show
this effect, with the harmonics being only just visible at least 80 dB down.
I have line out set to a low setting, only 10. 

What am I doing wrong?


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