[Elecraft] KPA500 PA current

[Andy Durbin]

"Note that I don’t discount that the 20m LPF is noticeably less efficient than those on the other bands. Each KPA is unique in this sense - we tune the LPFs for best efficiency for each band. I suspect your KPA is just fine, but the more info we get from you, the more we can tell what is going on."

In the time I have owned and used my KPA500 I have noticed that 20 m band requires a higher drive level than other bands.  This thread prompted me to do some more analysis of data I had recorded last year.   

Data here - https://tinyurl.com/y5oygtlp

The data show that my KPA500 is significantly less efficient on 20 m than on the other bands tested.  Is this a characteristic of all KPA500 and, if so, why would that be the case?  Note that my dummy load shows variation of characteristics with frequency and heating.  I have the load complex values for every data point but I used a test run average R and X to name each test plot.  

73,
Andy, k3wyc