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The Tenerife Microwave Spectrometer (TMS) is a ground-basedradio-spectrometer that will take absolute measurements of the sky between10-20 GHz. To ensure the sensitivity and immunity to systematic errors of thesemeasurements, TMS includes an internal calibration system optimised for the TMSband, and cooled down to 4 K. It consists of an Aluminium core, composed of abaseplate and a bed of pyramidal elements coated with an absorber material anda metallic shield. The absorber coating is made of a commercial resin ECCOSORBCR/MF 117. To achieve the high stability (+/- 1 mK/h), temperature homogeneity(thermal gradients {AT <= 25 mK), and emissivity (e>= 0.999) requirements ofthe reference unit, careful consideration has been given to the RF and thermalproperties of the materials, as well as their geometry. In summary, this paperpresents a comprehensive account of the design, characterisation, and testresults of the TMS reference system.

A Microwave Blackbody Target for Cosmic Microwave Background Spectral Measurements in the 10-20GHz range