The Model 875 vector signal generator is available in five frequency-range models covering 10 MHz to 40 GHz, with an internal I/Q modulator and 400 MHz of RF modulation bandwidth. Option PDW plays back Pulse Descriptor Words that set frequency, power, phase and pulse width on an 8 ns grid. Up to four phase-coherent channels fit in one 2U chassis. Applications include radar threat simulation, EW receiver testing, avionics signal emulation and arbitrary I/Q playback.