Avrtx R1-2020 Echolink Controller Voice Interface Board USB Sound Card User Manual
The R1-2020 User Manual ver 1.8 provides detailed instructions for using the Avrtx Echolink Controller Voice Interface Board USB Sound Card. Its built-in USB sound card chip and serial chip make it compatible with AllstarLink, Zello EchoLink, SSTV, psk31, and more. Its full metal case shields all interference, ensuring high-quality audio input and output.