University of California,Davis 69.1 Modulation and Demodulation Jefferson F. Lindsey III Modulation. Superheterodyne Technique. Pulse-Code Southern Illinois University at Modulation. Frequency-Shift Keying. M-ary Phase-Shift Carbondale Keying. Quadrature Amplitude Modulation Dennis F. Doelitzsch 69.2 Radio 3-D Communications Standard Broadcasting (Amplitude Modulation).Frequency