M.E.C.’s reflectometer test sets reduce set-up time while facilitating state-of-the-art resolution broadband return and insertion loss measurements on double-ridge waveguide and coaxial components. Coaxial input is provided via a broadband, low VSWR waveguide-to-coaxial adapter for connection to a sweep signal source. This is followed by a low loss broadband absorption filter which suppresses harmonic and spurious frequencies often found in sweep signal sources. Because of this high attenuation (typically 50 dB), fine grain is reduced over the full waveguide band, permitting insertion loss resolution in the order of 0.1 dB to be easily measured. A 20 dB leveling coupler is next included to supply a source of feedback for the sweep oscillator. The test set is completed by a 10 dB high directivity broadband reflectometer coupler with MEC-C1 flange (cover type with alternate tapped and clearance holes) to which the device under test is attached for return or insertion loss measurements. Assemblies are precision machined from aluminum with coaxial connectors of stainless steel. Finish is chromate conversion with gray epoxy enamel.