The FMWNS2000 is a Ka Band waveguide Noise Source module with output Isolator that operates over the full frequency range of 26.5 GHz to 40 GHz. The benefit of the output Isolator results in improved output port matching for more accurate measurements as well as protection of the noise diode from incident RF power. The microstrip assembly incorporates a millimeter wave noise diode screened for superior noise characteristics that results in highly stable and reliable performance. This module can be used in built-in test and laboratory applications, and can replace outdated gas tube noise sources. Addtional applications include noise figure measurements, millimeter wave radiometers, automotive radar, and reserach and development in mm-wave broadband wireless communication systems. The design operates at +28 Vdc with an output ENR level of 15 dB min and a noise output variation of < 0.01 dB/°C, < 0.1 dB/%V. Maximum Flatness across the frequency band is +/- 0.75 dB and output VSWR is 1.3:1 with the Isolator. Operating temperature range is 0°C to +85°C. The rugged package supports a WR-28 waveguide interface and a BNC connector for the DC voltage supply.