ABSTRACT: This is the user guide of the Maury Microwave TNC Coaxial Calibration Kit for models 2950CK40/41 2950CK20/21. This series of TNC coaxial calibration kits is designed to provide accurate calibrations of network analyzers in the DC to 18.0 GHz range. Each of these kits includes all the necessary calibration standards and associated hardware needed for the accurate calibration of most network analyzers.