TY  - JOUR
AU  - Archer, J. W.
PY  - 1983
DA  - 1983//
TI  - Multiple mixer, cryogenic receiver for 200-350 GHz
T2  - Rev. Sci. Instrum.
JO  - Rev. Sci. Instrum.
SP  - 1371
EP  - 1376
VL  - 54
IS  - 10
KW  - Schottky
KW  - mixer
KW  - noise temperature
AB  - This paper describes a new 200–350-GHz dual polarization heterodyne radiometer receiver for radio astronomy applications. The receiver incorporates four pairs of cryogenically cooled Schottky-barrier diode single-ended mixers, each pair covering a 30–40-GHz subband of the full operating band. Each mixer, with its IF amplifier, is mounted in an individual cryogenic subdewar comprising a separate vcuum chamber and a cold stage, which may be readily thermally connected to or disconnected from the main refrigerator by a novel mechanical heat switch. A dual polarization LO diplexer is mounted on a rotary table above the subdewars. For band selection, the two diplexer rf output ports may be positioned over any of the four pairs of subdewars. The SSB receiver noise temperatues achieved are less than 500 K between 200 and 240 GHz, less than 800 K between 245 and 275 GHz and 1500 K at 345 GHz.
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=589), last updated on Wed, 02 Dec 2009 16:48:30 -0600
ID  - Archer1983
ER  -