The APUASYN20-X is a very compact, very agile signal source series with frequency range of up to 20 GHz. It combines fast switching speed with low phase noise and good signal purity. The unit is available in 1, 2, 3 or 4 channel configurations in a standard 1 HU 19’’ rack-mountable enclosure. For high phase coherence, RF channels are locked to a common frequency reference.