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I believe that applying 5 volts to pin 8 of the tuner socket will inhibit TX.

I am at a loss though to understand why you? would want to use the 847 for RX, when the 3000 is arguably better at RX on HF.

Also, if the FT3000 is being used for TX, you will be overloading front of FT847, surely?

Why? not just swap antenna feeds in to 847, and use that, with 3000 turned off? Seems much easier.

?

Andy