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Re: FT-980 does not transmit in HAM mode. Lack of bias. ?Tantalum capacitors in PA?


 

After I commented with a friend about the tantalum problem in PA predriver, he look at a FT-107 bought in a lot (interested in the tuner FC-107) he look in the PA and found predriver tantalum blasted too.

PA in these radios are very very similar.

In the FT-107 it is 16V (blue), and in the FT-980 they changed it for 25V (red), the only 25V tantalum on the PA the remainder are 16V (brown)

Curious that Yaesu changed voltage rate in the FT-980 to 25V. Maybe had some feedback from other radios. I guess FT-707 is similar. And there are the first transistor finals radios.

73 EA1FC

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