ABSTRACT: This is the user guide of the Maury Microwave TNCA Coaxial Calibration Kit (DC to 20 GHz) for Models 8670CK10/11 and 8670CK20/21. This series of TNCA the DC to 20.0 GHz coaxial calibration kits is designed to provide accurate calibrations of network analyzers in range. Each of these kits includes all the necessary calibration standards and associated hardware needed for the accurate calibration of most network analyzers.