George,
Your understanding is correct. Elecraft recently improved the heatsink
with additional area. The new heatsink is an "L" shaped metal that
wraps around the bottom on the KX3 as well as covering the rear area.
The stock heatsink is quite adequate for CW and SSB modes, and you
should be able to run at full power.
If you are doing digital modes with long transmit times *and* you want
to operate at power levels above 3 (maybe 5) watts, then you may want to
consider one of the 'aftermarket' heatsinks.
The KX3 will reduce power to protect itself if the PA transistors get
too hot.
So you will find your answer by considering what modes you wish to
operate, the transmission times involved, and of course will you be
operating portable when the ambient temperature is HOT and the sun is
shining directly onto the KX3. Those are abnormal conditions, but if
you expect to encounter those extremes, one of the aftermarket heatsinks
may be a good idea - for normal operation the stock heatsink will do
quite well.
73,
Don W3FPR
On 3/19/2016 9:37 AM, george allen wrote:
> It is my understanding that an additional heatsink for the KX3 is not required. Is this correct? I searched the list atchives and coulld not find clear info on this.
>
> I am sure that this has been covered before, please forgive me.....I just didnt find my answer.
>
>
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