At the request of Paul, M1PAF, I've measured the harmonic distortion
seen at the headphone output in a K3 operating with with 2.7 KHz
bandwidth USB mode with a single tone at 500 Hz offset. This allows up
to the fifth harmonic to be within the DSP passband.
The details are at
http://www.cliftonlaboratories.com/elecraft_k3_receive_audio.htm.
Audio level is set for a comfortable listening level with a Heil Pro
Set, corresponding to about 30 mV RMS.
The short story is 2nd harmonic is at least 80 dB down and the 3rd
harmonic is 76 dB down. Fourth and fifth harmonics are in the noise and
not visible. An artifact at 3.9 KHz is also visible, although quite far
down compared with the desired signal.
Jack K8ZOA
www.cliftonlaboratories.com
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