[Elecraft] KPA500 cooling and efficiency

[Charlie T]

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: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of K9MA
Sent: Tuesday, May 22, 2018 1:07 AM
To: elecraft at mailman.qth.net
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

k9ma at sdellington.us

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