If you’re moving from a Yaesu FT-991A to the new Icom IC-7300MKII, getting it working with WSJT-X is surprisingly straightforward — especially if you already had an original 7300 configured. In my case, I initially kept my old WSJT-X settings and simply changed the radio’s CI-V address to `94h`, which allowed everything to continue working without rebuilding my configuration from scratch.
That said, I eventually found the better long-term setup was to leave the radio at its factory-default CI-V address of `b6h` and use the latest Hamlib preset specifically for the 7300MKII inside WSJT-X. This seems to be the cleanest and most compatible configuration overall, especially if you also use SDR-Control for remote operation. SDR-Control expects the radio to remain at the default CI-V address in order to properly handle transmit functions.
One quirk I ran into involved the radio’s DATA MOD and DATA OFF MOD settings. SDR-Control likes to change both of these to `LAN`, which caused WSJT-X to key the radio without actually transmitting audio. If WSJT-X suddenly stops producing RF even though PTT still works, check those settings immediately. Setting both back to `USB` restored normal operation for me.
Aside from those small setup quirks, the 7300MKII has been a major upgrade from my FT-991A. The transmitted signal looks noticeably cleaner, and I’m able to hold a very clean 104 watts with essentially perfect ALC behavior. My FT-991A typically topped out around 98 watts under similar conditions. Having a true SDR transceiver with solid remote-control capabilities has also been incredibly exciting, especially for digital modes and remote FT8 operation from my Mac.
Icom IC-7300mk2 and WSJT-X
> May 11, 2026
