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A 345 GHZ heterodyne receiver for the James Clerk Maxwell Telescope |
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| Authors: | C T Cunningham R H Hayward J D Wade S R Davies and D N Matheson |
| Institution: | (1) Herzberg Institute of Astrophysics, National Research Council of Canada, 100 Sussex Drive, K1A 0R6 Ottawa, Ontario;(2) Electronic Enginnering Laboratories, University of Kent at Canterbury, CT2 7NT Kent, Canterbury, UK;(3) Rutherford Appleton Laboratory, Chilton, OX11 OQX Didcot, Oxfordshire, UK |
| Abstract: | 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. |
| Keywords: | SIS-mixer quasiparticle mixer millimetre waves |
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