Yes! Replacing the MOSFETs fixed my sBitx v3.
So I have learned two lessons:
- Running continuously in FT8 mode requires either reducing DRIVE or using a fan to improve cooling MOSFETs (especially if running at 13,8V power supply voltage).
- MOSFETs failure due to overheat do not necessarily cause shorting drain to source.
Thanks a lot to all who helped me to isolate and fix the problem.
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73,
Wojtek
