[Elecraft] K3S QST Article

Wes Stewart wes_n7ws at triconet.org
Sat Oct 15 11:44:16 EDT 2016


Wayne,

Ok, I'll defer to your numbers.  Offhand I don't have mine handy, but I was 
pretty amazed at how quickly the IMD rose above 10W. I'm not saying anything new 
here, back in December in this thread 
http://elecraft.365791.n2.nabble.com/Powering-a-K3s-from-a-battery-tt7611959.html#a7611980, 
I said among other things:

"All I'm saying is that if you run the LPA at 10-12 watts, according to my
measurements*, the IMD is pretty bad.  If you have an HPA, then after it's
kicked in, (13W in my K3S) the LPA is running at greatly reduced power.  I don't
believe Elecraft has to change anything.  Guys with a KPA3(A) just need to avoid
the grey area of 10-15W.


*Remarkably, IMD measurements I made on my K3S using modest equipment correlated
within 1dB or less to measurements made by Elecraft, on the same radio. "

Wes



On 10/15/2016 8:07 AM, Wayne Burdick wrote:
> Wes,
>
> This would be a simple firmware change, and it might be worth considering. But typically we see -30 dBc or better at 12 W in production with the latest revisions.
>
> 73,
> Wayne
> N6KR
>
>
> On Oct 15, 2016, at 7:59 AM, Wes Stewart <wes_n7ws at triconet.org> wrote:
>
>> ….I would recommend that Elecraft change firmware to set the max power out at 10W (LP) and switch in the KPA100 above 10W, not 12.
>
>
>
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