Development of a 22 GHz receiver for Yamaguchi 32-m radio telescope

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We have developed a cooled low-noise receiver at 22 GHz, which is an important observational frequency of the East-Asian VLBI Network. The 22 GHz receiver is composed of a cooled-polarizer, two Low Noise Amplifiers (LNA) for receiving dual polarization simultaneously, mixers and two amplifiers, and back-end. A unique calibration system using a small hole for noise injection is adopted. This hole is also used for drying the waveguide. The noise temperature of the LNA is about 25 K. Since the polarizer is also cooled with the LNAs, the receiver noise temperature of below 45 K was achieved.