FT-991 USB Configuration : Ham Radio Deluxe Customer Support
Yaesu FT-991A HF/6 2/70 Transceiver Review
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How-To setup your Yaesu FT-991A for the FT8 data mode and WSJT-X - YouTube
FT-991 setup for digital modes (with only a USB cable) – N1AV (x-N1RWY) on the air
USB Cable for Yaesu ft- 710 891 FT 991 A FTDX 10 ftdx 101 D MP ftdx 3000 WSJT-X | eBay
FT-991A Setup for Digital Modes (for Windows 10 and a USB cable) - by VK3BT - Net Magellan
Yaesu USB Driver Update - morsetutor.com
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Data mode communication on the Yaesu FT-991 - Amateur radio tips and how-to guides