Reset (this is held high by the radio when on).Sense (this is connected to GND in the tuner, most likely for detection).+13V OUT (not fused I’ve heard, so be careful).Cable is straight through (meaning TX D/RX D are swapped in the tuner).The TX INH line is used to supress RF while switching the tuning circuit in/out. Then the command to start tuning is sent and a lower power carrier is sent.If the SWR is too high the tuner won’t start tuning. First a command is sent to disengage the tuner, then a a high(er) power carrier is sent to detect SWR.The ultimate goal of this project is to connect an Icom AH-4 tuner to Yaesu radios.ĭata shown is hex. I have not been able to find any information online at all about the propriatry protocol used, so I’m compiling this from my observations. Notes about the Yaesu FC-30 tuner connected to the FT-891 radio.
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