This is my modification to psk31lx. It was originally written by Hansi, DL9RDZ, and was the first psk program for Linux. It's psk code has been used by most of the other Linux PSK programs.

Psk31lx uses ncurses instead of a graphical interface. That means you can run it in a terminal window. In fact, you don't even need to have the X window system running. It will run fine on a dumb terminal or a Linux system booted into single user mode.

The original program only had a phase scope. This made tuning a PSK signal difficult. In this version, I've added a spectrum display that makes tuning much easier.