Re: KPA500 PA current
Posted by
ANDY DURBIN on
Aug 04, 2019; 5:34pm
URL: http://elecraft.85.s1.nabble.com/KPA500-PA-current-tp7654248p7654257.html
"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/y5oygtlpThe 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
______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.htmlMessage delivered to
[hidden email]