This code controls a GUI window, which provides monitoring of the internal status of a modem. It shows, graphically:
- the constellation, for PSK, QAM and other similar modulations.
- the equalizer status, for modems with adaptive equalizers.
- the carrier frequency.
- the symbol timing correction.
This code uses the FLTK cross platform GUI toolkit. It works on X11 and Windows platforms. In addition to the basic FLTK toolkit, fltk_cartesian is also required.