Title :
Low-Noise VLBI Receiver at 22 GHz for Radioastron Satellite: Progress Report
Author :
Räisänen, Antti ; Peltonen, Juhani ; Lahtinen, Ari ; Leino, Anne-Tuulia ; Mallat, Juha ; Piironen, Petri ; Ylinen, Juhana ; Jukkala, Petri ; Kangasmaa, Seppo ; Pöllänen, Ossi ; Somerma, Hans
Author_Institution :
Helsinki University of Technology, Radio Laboratory, Otakaari 5 A, SF-02150 Espoo, Finland
Abstract :
The progress made in the 22 GHz low-noise Radioastron receiver project is described in this report. In this project a receiver for satellite VLBI radio astronomy is being designed and constructed. The LNA utilizing HEMTs will be cooled to 80 K, the other parts of the receiver including a phase-locked LO at 21.72 GHz, down-conversion to 512 MHz IF, total power detector and noise injection calibration system stay at 300 K physical temperature. First measurements show a noise temperature of 100 K for the LNA at 80 K.
Keywords :
Calibration; Detectors; HEMTs; MODFETs; Phase detection; Phase noise; Radio astronomy; Receivers; Satellite broadcasting; Temperature;
Conference_Titel :
Microwave Conference, 1989. 19th European
Conference_Location :
London, UK
DOI :
10.1109/EUMA.1989.334104
