Aaron,
You might double check ur fets after install. again i dont own the SBITX but make sure ur fets are properly insulated from the heat sink and the mounting screws are properly installed. might be.if the sbitx has insulating wafers instead of direct mounting, that you might have a small hole in one of them and shorting one of the fets to the heatsink.
probably could ohm the fet to the heatsink and see if you have a direct short before you apply power.
I had a problem once where the insulating bushing for the screw had broken because i cranked it too much.It cracked and the screw was shorting out the fet when powered. I was using a new screwdriver.HI HI. if the radio has this, double? check the wafer, the insulating body for the screw, etc. Just for good measures.wafer can have a hole or crack develop in it and break down due to installation. ive had insulation pads (wafers as i call them)go bad too.
73
David
ac9xh
