Multiband low-noise receivers for a very large array

Details Multiband low-noise receivers for a very large array Multiband low-noise receivers for a very large array

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977itmtt..25..243w&link_type=abstract

IEEE Transactions on Microwave Theory and Techniques, vol. MTT-25, Apr. 1977, p. 243-248.

Astronomy and Astrophysics

Astronomy

4

Antenna Arrays, Antenna Design, Antenna Feeds, Microwave Antennas, Radio Astronomy, Radio Receivers, Very Large Array (Vla), Cassegrain Antennas, Parametric Amplifiers, Parametric Frequency Converters

Scientific paper

The very large array (VLA), presently under construction by the National Radio Astronomy Observatory, is an array of 27 25-m-diam antennas. This paper describes the feed and low-noise front-end systems used on the antennas. The receiving system allows operation at any one of the four frequency bands: 1.35-1.73 GHz, 4.5-5.0 GHz, 14.4-15.4 GHz, 22-24 GHz. The feed system uses an offset Cassegrain geometry so that the feeds for all four frequency bands can be in position on the antenna simultaneously. The front end comprises a cryogenically cooled parametric amplifier for the 4.5-5.0-GHz range. This paramp is preceded by cooled upconverters or cooled mixers for the other frequency ranges. Measured system performance is presented and some construction details are given.

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