I've completed a few K3 receiver audio output measurements today, and
added a new page with the data.
http://www.cliftonlaboratories.com/elecraft_k3_receive_audio.htm
I found some curious artifacts in the audio output, including some
signal related artifacts around 12 KHz, and at 3.9 and 7.8 KHz. I don't
know if these are unique to my K3, or to my test setup, so I welcome
other observations.
If these artifacts are not unique to my K3 and/or test setup, it might
explain some oddities heard in the audio, if your high frequency hearing
is good and if you use headphones capable of 20 KHz reproduction.
Although my headphones are good up to that range, too many years of
listening to loud CW mean that my hearing has a cutoff sufficiently low
so that none of these oddities make it into my wetware audio processor.
I've also made an automated GIF image of spectrum analysis images for
LIN OUT settings from 2 to 100, as well as a few other points that may
be of interest.
Jack K8ZOA
www.cliftonlaboratories.com
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