[Elecraft] Prototype KPA500 monitor

[Andy Durbin]

No interest shown here but I have been asked for more information off list.   Since the work is done I'll share it here.

The attached will give you some idea of how PA dissipation and PA efficiency change with output power and loading.   These plots are from a test I ran last year, long before the KPA500 Monitor page was added to my Arduino interface.  The introductory para of the incomplete report is quoted below:


"Summary

A semi-automated test was run for various frequencies and PA load conditions.  Spectrum lab was used to generate a 1,000 Hz tone with a sawtooth amplitude profile.  This tone was used to modulate the TS-590S exciter. An Arduino based data logger recorded serial data from the KPA500 and an LP-100A.  These data were processed in Excel by using a pre-defined template.  The LP-100A provides SWR, Z, and phase angle.  X and R were computed from Z and phase angle."


73,

Andy k3wyc


https://www.dropbox.com/s/r0jq4vdgdndgj53/KPA500%20PA%20diss%20and%20effic%20k3wyc.pdf?dl=0