A network analyzer for characterizing a radiofrequency device requires a radiofrequency receiver for collecting the signal that was generated to probe the response of a Device Under Test, and a matching signal source. We consider the RTL-SDR dongle as the receiver, while the Raspberry Pi processor Phase Locked Loop (PLL) has been shown to generate a radiofrequency signal in the FM band. In this demonstration, PiFM is used as a signal source. As students were not allowed to visit university during lockdown, a cost-effective solution had to be found to provide hardware to all students to complete the course at home: the solution of a Raspberry Pi4 and DVB-T dongle was selected to provide the framework of embedded radiofrequency system development. GNU Radio is cross-compiled using Buildroot to the Raspberry Pi 4, iterative tests allow for checking the functionality of each step, until a complete measurement is achieved.