Install fldigi by entering the following commands in the terminal:
sudo apt update sudo apt install fldigi
Description:
digital modem program for hamradio operators
Fldigi is a modem program which supports most of the digital modes used by hamradio operators today. You can also use the program for calibrating your sound card to WWV or doing a frequency measurement test. The program also comes with a CW decoder. Fldigi is written with the help of the Fast Light Toolkit X GUI.
Homepage: http://www.w1hkj.com/
Version: 4.0.1-1
Section: universe/hamradio