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I am successfully running FT8 with WSJT-X on Windows 10 with my IC-7300. I am using IC-7300 as the rig.

On reading the official WSJT-X User Guide (and various YouTube videos, etc.) I see that many places strongly recommend running FT8 in split mode. Since the IC-7300 has two VFOs and supports split mode I chose the "Rig" setting in the WSJT-X settings. When I do so I see the radio shows "SPLIT" on its screen and does use separate receive and transmit frequencies. However, when it transmits it transmits at zero RF power regardless of what I set the RF power to with the Multi knob.

But when I change WSJT-X to "Fake It", which does not use SPLIT mode and instead just makes the radio change frequency to transmit and then makes the radio change it back to receive I see the radio transmitting at the power level I'd expect.

Any idea why I'm seeing my radio sit at zero transmit power in SPLIT mode? I've talked to a couple of friends with IC-7300 radios and they are not seeing that happen with them -- they see the radio transmit at expected power.

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    $\begingroup$ I don't have an IC7300, but see that on this page k0pir.us/wsjt-x-split-operation there is this note: Note: If you are using the Icom 7300 or 7610 and Ham Radio Deluxe for the Rig in WSJT-X, you will have to use “Fake It” for Split Operation. Sounds like a 7300 issue with WSJT? $\endgroup$
    – David Hoelzer
    Aug 31 at 15:43
  • $\begingroup$ Perhaps, but in my case I'm not using HRD as the rig but rather IC-7300 as the rig. $\endgroup$ Sep 1 at 13:23
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Short version of the answer:

VFO B was USB, not USB-D. After manually changing VFO B to USB-D it worked.

Longer version:

I went back to testing this again and finally noticed that the mode indicator was changing from USB-D to USB every time the WSJT-X keyed up the radio. Apparently telling WSJT-X to use data mode only ensures the radio is using data mode on VFO A. Thus you apparently have to manually make sure VFO-B is also set to USB-D.

Given that, I think I'll just keep using "Fake It" instead of "Rig". It accomplishes exactly the same thing and I don't have to worry about forgetting to put VFO B in a proper state.

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