KX2 + PA temp woes

[WU7H]

Here is another thread with some data on heatsink/fan effectiveness:

KX2: testing two different cooling techniques

NOTES ON THERMAL TESTING of KX2: Two configurations tested: (a) aluminum heat sink, thermally coupled with heat sink paste, held in place with bungee cords; (b) pair of small 12 vdc fans (blowing onto rig), current draw 170 mA. Details: 10m cw; 10w; calling “cq sota cq sota cq sota de k7zoo k7zoo k” 20 wpm with 10 sec repeat time; ambient air temp 38-40 C; freshly charged stock batteries used for each test; no wind; no sun. RESULTS: The heatsink cooled about 1.5 deg C, while the fans cooled just…