FWIW and don't know how this would work on a KX3 but ...
When I still had my KPA100 on my K2, and was using the K2/100 in RTTY contests, I stuck a brushless 12 VDC computer muffin fan to the top of the heat sink, blowing down, with a little tab of velcro over the PA's. I have a digital thermometer with a remote sensor on a very small wire, and I tacked it to one of the PA transistors. I was able to run in a contest at 100 W and the PA temp stayed well within limits. The heat sink stayed cool to the touch.
As I said, FWIW. I finally sold the KPA100 and use my K2 as my field rig with the Alex Loop and no digital now.
73, Fred K6DGW - Northern California Contest Club - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015 - www.cqp.org On 7/23/2015 1:40 PM, KM4VX wrote:
I have found that the use of an inexpensive computer type fan on even low power running behind the KX3 works well in allowing the full use of the digital modes, to include WSPR at 5 watts full cycle of 112 seconds. Thank you for all the thoughtful inputs. Running WSPR at 3 watts does not require the fan, but at 5 watts the fan is adequate. The radio gets warms, but does not overheat. My KX3 came with the latest heat sink from ElecraftI, have not performed the temperature compensation mod, and will not be buying any after-market heat sink. 73 Ron KM4VX
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