Digitized frequency synthesizer
Digitized phase modulating means
Digitized phase modulating means
Diode ring mixer
Direct digital amplitude modulator
Direct FM crystal-controlled oscillator
Direct modulation 4 phase PSK modulator
Directional PSK modulation and demodulation system
Double balanced modulator-demodulator
Double sideband generation with serrodyne modulators
Double sideband modulator
Double sideband suppressed carrier modulator using surface wave
Double sideband transmission system
Double-balanced modulating and demodulating apparatus