Computer Science
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ijimw..13..659l&link_type=abstract
International Journal of Infrared and Millimeter Waves (ISSN 0195-9271), vol. 13, no. 5, May 1992, p. 659-667.
Computer Science
2
Calibrating, Heterodyning, Noise Temperature, Radio Receivers, Sis (Superconductors), Volt-Ampere Characteristics, Broadband, Mixing Circuits, Radio Telescopes, Schottky Diodes, Very High Frequencies
Scientific paper
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.
Cunningham Charles T.
Davies Steven R.
Little Leslie T.
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