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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