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Paper: An Ultra-Wideband Receiver and Spectrometer for 74100GHz
Volume: 375, From Z-Machines to ALMA: (Sub)Millimeter Spectroscopy of Galaxies
Page: 71
Authors: Erickson, N.; Narayanan, G.; Goeller, R.; Grosslein, R.
Abstract: A receiver system that covers the widest instantaneous bandwidth ever utilized by an astronomical heterodyne receiver is nearly complete. The entire 74110.5GHz band will be covered with a low noise frontend and a backend spectrometer having 31MHz resolution. The receiver is intended for astronomical use in searching for the highly redshifted spectral lines from galaxies of unknown redshift. The receiver uses InP MMIC based low noise amplifiers operated at 20 K, and operates with dual polarization feeds. The two receivers used with each feed are combined using a full band orthomode transition. Two such feeds are used in conjunction with a beam switch to maintain one dual polarized beam on the source at all times. The backend spectrometer is an analog autocorrelator built using very low cost microwave and analog/digital components.
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