A 345 GHz heterodyne receiver for the James Clerk Maxwell Telescope

Details A 345 GHz heterodyne receiver for the James Clerk Maxwell Telescope A 345 GHz heterodyne receiver for the James Clerk Maxwell Telescope

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ijimw..13.1827c&link_type=abstract

International Journal of Infrared and Millimeter Waves (ISSN 0195-9271), vol. 13, no. 12, p. 1827-1843.

Computer Science

Performance

12

Mixing Circuits, Network Synthesis, Superheterodyne Receivers, Telescopes, Design Analysis, Heterodyning, Low Noise

Scientific paper

In this paper we describe the design and performance of a low-noise 345 GHz heterodyne receiver. The mixer uses a lead alloy SIS tunnel junction mounted in reduced height rectangular waveguide and is tuned with a single backshort. Local oscillator power is provided by a broad-band Gunn oscillator which drives a frequency quadrupler. The heterodyne performance has been verified in the laboratory using a gas absorption cell. In November 1991 this receiver was successfully commissioned and by direct comparison with a Schottky diode receiver we confirm a best receiver noise temperature of 150K (DSB) at 355 GHz and a tuning range of 300 to 380 GHz. The receiver is now available as a JCMT facility instrument.

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