The limit was raised to 15 W with firmware revision 2.38.

POWER OUT NOW 15 WATTS MAX, 80-20 M: On 80-20 meters, the PWR control can now 
be set as high as 15 W (max is still 12 W on other bands). Supply voltage must 
be over 12.8 V on key-down as indicated by the KX3’s voltage display (tap DISP, 
rotate VFO B). Note: The KX3 will automatically reduce power as required if 
current, SWR, or temperature is excessive, or if supply voltage is too low. If 
a band other than 80-20 m is selected, power output will be cut back to 12 W 
max. It must then be manually set above 12 W after switching to 80-20 m.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Dec 8, 2016, at 12:38 PM, Phil Hystad <[email protected]> wrote:
> 
> I am confused.  Is the new 15 watt limit on output power a feature of new KX3 
> only or is it a software upgrade so that all KX3 rigs can be updated to 15 
> watts?
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