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Receiver design

The heterodyne receiver consists of a superconducting tunnel diode mixer mounted with a first intermediate frequency amplifier at the 4 K stage of the liquid helium Infrared Laboratory cryostat, of an ambient temperature second IF amplifier, and of a local oscillator. Local oscillator power is injected in the waveguide mixer input port through a cooled waveguide coupler. The mixer operates in the whole receiver band without any tuning, the only tunable part of the receiver being the local oscillator.

Robert Lucas
Thu Mar 9 14:41:52 MET 1995