Abstract: Apparatus for generating a coherent multichannel signal. The signal for each channel can be independently phase, frequency and amplitude modulated. The coherent multichannel signal is locked to a reference signal. A frequency generator establishes, at each output sample time, the phase information for each channel. A waveshape section converts the phase information into amplitude information to generate the desired waveforms. A multiplier amplitude modulates the generated waveforms which are converted into an analog voltage and fed to a low pass filter for smoothing the output and eliminating undesired high frequencies.