I believe this open-source shortwave transceiver is worth introducing to domestic HAMs, so I've created two small booklets: one summarizing the information on the official website and another translating a Japanese version of the assembly and debugging guide. These were prepared quickly and may contain errors; please point out any mistakes you find.
Further revisions and improvements will continue to be made. You are free to republish (but please indicate the source so that you can download the updated version), but do not use it for resale or profit-making purposes.
Download link: https://github.com/stgapr/trUSDX-manual/tree/master