My Signalink USB Sound Cards are used with radios that do not have an internal sound card such as the IC-7700 and the Kenwood TH-F6. I use a Signalink USB Sound Card to allow me to operate digital modes such as FT4 and FT8 on my IC-7700 on HF and 6 meters. I also sometimes use a Signalink USB Sound Card with my TH-F6 and the Soundmodem software to connect to 1200 baud packet nodes or 1200 baud VARA FM nodes. Signalink USB Sound Cards produced since 2018 have wider bandwidth than the original versions and may be used at 9600 baud.