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Hi all,
I do not have 12V voltage measured at the output of the 144 Mhz socket behind the ft-847.
Menu # 29 is activated on "Ant".
The same measurement on 430 Mhz with menu # 30 on "Ant" gives 12V. 
It seems that a transistor does not work anymore.
An idea to look for?
Jerome f8aof

Looking at the circuit diagram available here? ? ?

?

Check voltage at J4003 pin 5. This feeds in to Q4011, that then turns on Q4010, which goes via L4030 to antenna socket. I would guess L4030 would act like a fuse, suggest you try volts each side of that as first step.

?

Andy