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View Code? Open in Web Editor NEWA software defined radio differs from a traditional radio in several ways. The biggest difference is in how RF is detected and demodulated. An SDR uses a quadrature sampling detector (QSD) that divides the incoming waveform into an in-phase and quadrature signal. The in-phase signal is the first 90º of the RF sine wave and the quadrature signal is the second 90º segment of the RF sine wave. SDR has several advantages over traditional radios.