[Elecraft] KPA-1500 ATU not working well

[ANDY DURBIN]

"If 1.5:1 does  this, then that's good enough in my book.  Furthermore, a better match might  entail higher tuner losses.  So why worry about it?

My test data for my KPA500 show there is a very significant difference in PA dissipation and also in harmonic output for loads giving indicated 1.4:1 SWR and loads giving 1.0:1 SWR.    When I have a more complete data set I'll make it available for peer review.  My tentative conclusion is that even a moderate mismatch of KPA500 load is quite detrimental.

73,
Andy k3wyc