The FreeDV project has been active for many years and has produced a suite of digital voice modes for HF radio. Now there is a new and exciting Radio Autoencoder mode RADE. The RADE mode is a real advance. It has a small peak to average power radio. And its digital constellation is not discrete dots but rather a continuous analog pattern.
I do not have enough documentation at this time to make RADE a built-in mode within Quisk. But the FreeDV group publishes a FreeDV-GUI program, and version 2 includes RADE. So you can run RADE with Quisk with the usual digital mode devices. To do this you start both programs and send the sound and microphone signals between them just as you would with WSJT-X.
The easiest way to build on Linux is to use the build script by Barry Jackson. You install git and clone the github site. Then follow the directions. This will build the current version 2 and add a desktop shortcut.
You can also search for official releases at https://github.com/drowe67/freedv-gui/releases/. Make sure you are getting version 2.0.0 and up. To get build instructions, clone the freedv-gui site and select the v2 branch. Branches prior to v2 will not build with RADE.
Go to the release site at https://github.com/drowe67/freedv-gui/releases/ and pick a release for Windows. These are installable FreeDVxxx.exe files.
Connecting FreeDV-GUI is similar to connecting WSJT-X and other digital programs.
See "Digital Modes" in the documentation.
To use FreeDV-GUI see the User Manual.
Quisk would normally send radio sound to the speakers. To use FreeDV-GUI, you need to send radio sound to FreeDV-GUI and let FreeDV-GUI send the decoded sound to the speakers. So first set the Quisk Radio Sound Output to "-blank-" to disconnect Quisk from the speakers. Then set the Quisk Digital Rx0 Output to the FreeDV-GUI sound input, and set the FreeDV-GUI sound output to the speakers. Now use the Quisk DGT-L or DGT-U buttons to send the radio sound. You do not use the FreeDV button.
Similarly, you set the Quisk Microphone Input to "-blank-" to disconnect Quisk from the mic. Then set the FreeDV-GUI mic input to the mic, and set the FreeDV-GUI sound output to the Quisk Digital Tx0 Input. You may want to create another "Radio" within Quisk to store these settings.
The Radio Autoencoder is a significant advance in digital voice. Thank you FreeDV group!
Jim Ahlstrom, N2ADR