Yes, if you want to run QRP/battery, you are fooling yourself if you crank ANY * 100 watt radio down to 10 watts out.
Same with, for example, the TS-480, 200 watt version. It's efficiency, even at 100 watts out is barely 25% The signal is probably cleaner, but the efficiency is shot. 73, Charlie k3ICH *the K3 is the exception since it bypasses the 100W amp when you go LOW (smart radio eh?). -----Original Message----- From: [email protected] <[email protected]> On Behalf Of K9MA Sent: Tuesday, May 22, 2018 1:07 AM To: [email protected] Subject: Re: [Elecraft] KPA500 cooling and efficiency On 5/21/2018 23:18, ANDY DURBIN wrote: > My KPA500 seems horribly inefficient when compared to my TS-590S running a > similar power output. The data for the heating test showed a PA efficiency > of 23%, far short of the "approximately 50%" stated in the specification. That's perfectly normal at that low power output. The 50% spec is at full output. If you ran your TS-590S at 20 W output, you would probably see about the same low efficiency. 73, Scott K9MA -- Scott K9MA [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
