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17–27 GHz Dual Horn Receiver on the NASA 70 m Canberra Antenna

Kuiper, T. B. H. and Franco, M. and Smith, S. and Baines, G. and Greenhill, L. J. and Horiuchi, S. and Olin, T. and Price, D. C. and Shaff, D. and Teitelbaum, L. P. and Weinreb, S. and White, L. and Zaw, I. (2019) 17–27 GHz Dual Horn Receiver on the NASA 70 m Canberra Antenna. Journal of Astronomical Instrumentation, 8 (4). Art. No. 1950014. ISSN 2251-1717. https://resolver.caltech.edu/CaltechAUTHORS:20200130-161748520

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Abstract

A dual beam, dual polarization, low noise receiver has been installed at a Cassegrain focus of the NASA 70m antenna near Canberra, Australia. It operates in five pairs of 1GHz bands from 17 to 27GHz simultaneously. The receiver temperature measured at the feed is 21–22K at 22GHz and, during dry winter night-time conditions, zenith system temperatures as low as 35K have been observed in the 21–22GHz band. The native polarization is linear but can be converted to circular prior to down-conversion. The downconverters have complex mixers, followed by quadrature hybrids which can be bypassed or used to convert the quadrature phase channels into an upper and lower sideband, each 1000MHz wide. For spectroscopy, four ROACH1 signal processors each currently providing 32K channel spectra across four 1000MHz bands, for 0.4km/s velocity resolution at 22GHz. Using both beam- and position-switching, the receiver achieved a noise level of 5mK r.m.s. in an hour of integration and 31kHz resolution. The NASA 70m antennas have a 45 arcsec beamwidth at 22GHz and an aperture efficiency of 35.5% giving a sensitivity of 0.49K/Jy.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1142/s2251171719500144DOIArticle
ORCID:
AuthorORCID
Kuiper, T. B. H.0000-0003-1798-4918
Franco, M.0000-0002-3560-8599
Greenhill, L. J.0000-0003-4912-5974
Price, D. C.0000-0003-2783-1608
Additional Information:© 2020 World Scientific Publishing Co Pte Ltd. Received 29 July 2019; Revised 23 September 2019; Accepted 13 October 2019; Published: 13 November 2019.
Subject Keywords:NASA 70m; CDSCC; radio astronomy; spectral lines; K-band
Issue or Number:4
Record Number:CaltechAUTHORS:20200130-161748520
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200130-161748520
Official Citation:The 17–27 GHz Dual Horn Receiver on the NASA 70 m Canberra Antenna. Journal of Astronomical Instrumentation 2019 08:04; doi: 10.1142/s2251171719500144
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101021
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:31 Jan 2020 00:27
Last Modified:31 Jan 2020 00:27

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