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We have tested a heterodyne receiver for millimetre-wave radio astronomy, which uses a quasiparticle mixer with junctions of Pb/Bi/In-oxide-Pb/Bi. A receiver noise temperature of around 100 K double sideband has been measured with a number of different junctions. For one junction, the best receiver temperature obtained was 73 K, and the mixer conversion loss was less than 5.8 dB double sideband.
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Blundell et al. (1983) studied this question.
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