How could I share rar/zip file ? Link : https://www.mediafire.com/file/1jt3pvfxgqjux5b/WaterfallDemo.rar/file How use ? There is 2 server, IQ and Sample. They are in Resources/server folder. Run only 1 file in same time. (you have to install pip packages) What will happend ? If you run spectrum_iq.py you will not see any thing. [image: 27ffd176-2b9e-46a8-8940-f8ccbebf2e87.png] If you run spectrum_sample.py you will see sweeped waterfall. [image: ee0bf5d2-9715-4e09-95c9-4d2fcb4266a1.png] I have 2 problem. Sweeped and visible. This is for windows, If you use ubuntu, you should change CmakeList.txt for qwt include