To demonstrate the implementation of the proposed system in developing countries, the authors have developed three classroom demonstrations for a communications system course. The objective is to provide the students a tangible, inclass experience with the theoretical concepts such as Quadrature Phase Shift Keying (QPSK) and Quadrature Amplitude Modulation (QAM). The eye diagram and constellation diagram of these modulation schemes are also demonstrated for the students to compare the theoretical concepts with the experimental and practical results.