2.0 GHz to 4.0 GHz automated radiometer operation and service manual

The 2.0 to 4.0 GHz subsystem of the automated radiometer is described. This section of the multiband automated radiometer is a coaxial total power radiometer which implements a six port reflectometer for impedance characterization and correction and utilizes a newly developed broadband cryogenic noise standard. NBS noise measurement capability in this frequency band was expanded by the addition of this system which adds continuous frequency coverage to existing services along with the capability to measure cryogenic noise sources.