Little, L.T. and Davies, S.R. and Cunningham, C.T. (1992) A 210-280 GHz sis heterodyne receiver for the James clerk Maxwell telescope .2. Calibration. International Journal of Infrared and Millimeter Waves, 13 (5). pp. 659-667. ISSN 0195-9271.
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The comparison of a 240 GHz SIS heterodyne receiver with a Schottky diode receiver at the Maxwell telescope revealed difficulties with its calibration using continuum loads. The difficulties arise from the fact that the local oscillator power is not hugely greater than the total load power incident across the RF and IR band. This broadband power influences the receiver gain, principally by varying the slope of the I-V characteristic, and hence the output matching as a result of the ac Josephson effect. Suppressing the Josephson effect with a magnetic field permits the standard calibration procedure, using hot/cold continuum loads, to be employed.
|Uncontrolled keywords:||Calibrating, Heterodyning, Noise Temperature, Radio Receivers, Sis (Superconductors), Volt-Ampere Characteristics, Broadband, Mixing Circuits, Radio Telescopes, Schottky Diodes, Very High Frequencies|
|Subjects:||T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunications
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics (see also: telecommunications)
|Divisions:||Faculties > Science Technology and Medical Studies > School of Engineering and Digital Arts|
|Depositing User:||M. Nasiriavanaki|
|Date Deposited:||29 Aug 2009 16:08|
|Last Modified:||29 Aug 2009 16:08|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/22349 (The current URI for this page, for reference purposes)|
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