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I cooled the finals

 

Hi
I noticed on my sbitx that at 5w to a dummy load with a couple calls on CW, the finals mosfets became incredibly hot. Poor heat transfer to the heatsink. Couldn¡¯t touch them. I removed the board and replaced the insulation micas with some thicker ones, put some heatsink compound on the mosfets and micas and reassembled the radio. Have tested with more power and for a longer period of time. My finals are much much more cold and believe much more reliable.
73?
Jo?o, ct1dgh
 

Hello.

?My first post ... Diaper rash cream is essentially the same thing as heat sink compound. ,zinc oxide paste with added scents.

David
KI7HDV


On Sun, Sep 18, 2022 at 3:16 PM Jo?o Marques <ct1dgh@...> wrote:
Hi
I noticed on my sbitx that at 5w to a dummy load with a couple calls on CW, the finals mosfets became incredibly hot. Poor heat transfer to the heatsink. Couldn¡¯t touch them. I removed the board and replaced the insulation micas with some thicker ones, put some heatsink compound on the mosfets and micas and reassembled the radio. Have tested with more power and for a longer period of time. My finals are much much more cold and believe much more reliable.
73?
Jo?o, ct1dgh

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