Thanks, Harold, I appreciate the info and will try to find the article.

Phase noise is but one of the problems Wes mentions, and on the
transmitter side he makes it clear the IMD particularly in the
transmitter final stage needs work and is perhaps the largest of the
problems on the transmitter side. Wes implies that he can actually
hear such distortion simply by listening to the band (I don't know what
to listen for beyond a particularly wide-frequency signal). Chris
Trask has done excellent work on this, but haven't seen actual IMD
numbers from his techniques.

I'm currently thinking a poor IMD transmitter would only be a problem
in a wideband mode such as SSB or SSTV. Though in theory a poor IMD
transmitter might cause keyclicks in CW (I really haven't thought this
out), I doubt this is much of a problem.

Regards,
Glenn Dixon, AC7ZN