I soldered several joints on my 472kHz ATU but still nothing in DIG mode from the FT817ND. On AM, it works. So, either I have some "finger trouble" with the FT817ND in digital mode or there is fault. I tried both front and rear connections and both seem the same (works on AM but not on DIG). I also tried "split" mode, making sure both RX and TX were on DIG. Still it insisted on 474.2kHz TX whereas TX should be on 80m. At the moment I still hope this is me rather than the rig. My brain is so fuzzy. For now I have left it.
UPDATE 1552z: Well I think one fault has been found. When I moved the lead from my SignaLink USB to different rig the plug would not go in. After bending the lead, it inserted fine. I suspect this is why the DIG was not working. I shall try on 472kHz WSPR TX tonight. It is quite hard when you have brain fog.
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