Rtlizer is a simple spectrum analyzer application written using rtlsdr, kiss_fft and Gtk+. It was originally created as a Beaglebone+rtlsdr demo, but it will probably run on anything with rtlsdr and Gtk+ installed.

You can see a short video demo on YouTube: https://www.youtube.com/watch?v=jzmFXreuFR4

• rtlsdr
• Gtk+ v2
• kiss_fft (included)

There are no makefiles, just two simple scripts containing a gcc command line:

• build - for building on i386-like computers
• build-target - for building rtlizer directly on the Beaglebone or compatible boards

You can basically run rtlizer as is in an X11 environment. The default window size is set to 320x240 but can be overridden using X Window System geometry string, e.g.

rtlizer 640x360+0+0

On the Beaglebone I am running my own built linux with X but no display or window manager. In this case I start rtlizer using the xinit command. Recipes for creating such linux images are available under the nanosdr project.

The file rtlizer.service is used to autostart the application on the Beaglebone using systemd.

Rtlizer was written by Alexandru Csete. Uses code from rtl_test by Steve Markgraf. Includes kiss_fft by Mark Borgerding.