Here is a YouTube video about Stefan Scholl DC9ST on the Panoradio SDR wideband direct sampling 250 MSPS SDR, and is part of a growing collection of videos I have found to be useful. The reason is showing a real build of direct sampling sdr hardware and understanding science related to software defined radio.
This tutorial, "Stefan Scholl DC9ST on the Panoradio SDR wideband direct sampling 250 MSPS SDR" is free education you can watch, which will help you deepen your knowledge and be better prepared for licence exams, schoolwork, or operating radio equipment.