Unfortunately, the Z817 does use proper CAT commands to set the FT81x to low power transmit when tuning. It's fixed at 38400 baud, so the pass through won't work for the OP.
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You can use the Z817 as a tuner without the CAT cable, i.e. connect the display directly to the radio.?
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Full detail in the Z817 instructions...
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Regards
John G0GCD
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