The N5191A UXG X-Series agile signal generator, modified version, provides fast frequency, amplitude, and phase coherent switching from 10 MHz to 40 GHz

Get closer to reality: simulate increasingly complex signal environments for radar, EW, and antenna-test
Test sooner and increase confidence in EW systems by generating signal simulations when you need them: the UXG is a scalable threat simulator
Use pulse descriptor words (PDWs) to generate long pulse trains and individually control pulse characteristics
Quickly characterize antennas over a wide frequency range with fast frequency tuning
Performance without requiring an export license
What's included:

10 kHz frequency resolution
100 μs switching speed up to 31.6 GHz; 500 µs up to 40 GHz
Amplitude range of +10 to -10 dBm
Standard phase noise of -117 dBc/Hz (typ) at 20 kHz offset for a 10 GHz carrier frequency
3.5 mm (f) to 3.5 mm (f) connector adapter (20 GHz model only)
2.4 mm (f) to 2.4 mm (f) and 2.4 mm (f) to 2.9 mm (f) connector adapters (40 GHz model only)
Country-specific power cord
Documentation set (CD-ROM)
One day of on-site startup assistance