USB Cable for Yaesu ft- 710 891 FT 991 A FTDX 10 ftdx 101 D MP ftdx 3000 WSJT-X | eBay
Please use this setup by N1RWY to start with (I've modified them to fit the FT-991A This set up only concerns Winmor and not Pac
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Yaesu FT-991 Digital modes setup - morsetutor.com
FT-991
Yaesu FT-991 Firmware Ver Up Manual ENG 1612-D : Free Download, Borrow, and Streaming : Internet Archive
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Usb Pc Linker Adapter Radio Connector For Yaesu Ft-450d Ft-950d Dx1200 Ft- 991 Ic-2710/2720/2820 Ft7800\8800\8900\100d U5 Link - Earphone Accessories - AliExpress
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How to set up a Yaesu FT-991 for FT-8 using the WSJT-X software - YouTube