Does KPA1500 have these KPA500 characteristics?

Posted by ANDY DURBIN on May 25, 2018; 2:15pm
URL: http://elecraft.85.s1.nabble.com/Does-KPA1500-have-these-KPA500-characteristics-tp7641171p7641189.html

"The KPA500 actually runs cooler at just-below-fault power output than it does at either 500 or even 400 watts output."


I ran a quick test to see if I saw the similar results with my KPA500. The quality of the data is limited by the low resolution of power returned by the ^WS command but it shows that PA heating is 350 +/- 25 W for all output power levels between 150 W and 500 W. Below 150 W the PA heating falls off with power output. The cluster of points close to 500 W lies at about 330 W heating which does support the idea that PA heating will be less at max power output. I did not extend the test beyond 500 W output.


I may try the test again with a better controlled drive ramp rate but the quality will still be limited by the resolution of power returned by ^WS. To get better results I'll need to expand my logger capabilities to include sampling of my LP-100A power data.


73,

Andy, k3wyc



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