An Ultra-Wideband Receiver and Spectrometer for 74--110 GHz

Details An Ultra-Wideband Receiver and Spectrometer for 74--110 GHz An Ultra-Wideband Receiver and Spectrometer for 74--110 GHz

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..375...71e&link_type=abstract

From Z-Machines to ALMA: (Sub)Millimeter Spectroscopy of Galaxies ASP Conference Series, Vol. 375, proceedings of the conference

Astronomy and Astrophysics

Astronomy

8

Scientific paper

A receiver system that covers the widest instantaneous bandwidth ever utilized by an astronomical heterodyne receiver is nearly complete. The entire 74--110.5 GHz band will be covered with a low noise frontend and a backend spectrometer having 31 MHz 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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