[Elecraft] KPA500 and VSWR

[Andy Durbin]

"With the lower VSWR, I never saw the PA temperature exceed 50°.  I suppose this shouldn't come as a surprise, but it does show the PA heating effects of even moderate load mismatches on a solid state amplifier designed for a 50 Ohm load. Just an anecdote that some may find interesting."

I have published actual test data that shows the very strong influence of PA load on PA dissipation for my KPA500.  SWR is not a good indicator of the load mismatch.  You must consider the complex load impedance to see the real picture.

For those who missed it the first time, one set of my test data is documented here - https://tinyurl.com/y93m99sw

The KPA500 monitor that I created is shown here - https://tinyurl.com/yalv5o6f


Andy, k3wyc