Hi Andrew,
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I may help here... My radio is FT-817ND and the plan is to use it as an IF rig for a 10 GHz station. Of course, I needed a sequencer and decided to design and make it myself. Using the inhibitor was part of this design. It allows to control the TX of the station by the PTT button of the radio mic. You press PTT, the sequencer can sense it, but no RF goes out of the rig until the sequencer makes the necessary switches. After it does and deems it to be safe, it lets the RF go. All this is possible due to controlling the inhibitor line.
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In my case, I use a 47K resistor to pull the Inhibitor line to the 13.8V point (also available on the same connector). This prevents generating any RF by default. When it is time to transmit, the inhibitor pin is connected to the ground.?
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I did testing using a power meter and it appears to be working pretty well.
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73, Nikolai VE3NKL
