The 17–27 GHz Dual Horn Receiver on the NASA 70 m Canberra Antenna
| Autor: | D. Shaff, T. B. H. Kuiper, T. Olin, Shinji Horiuchi, L. P. Teitelbaum, Danny C. Price, L. White, Graham Baines, I. Zaw, Sander Weinreb, Lincoln J. Greenhill, Manuel Franco, Stephen D Smith |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Journal of Astronomical Instrumentation. |
| ISSN: | 2251-1725 2251-1717 |
| DOI: | 10.1142/s2251171719500144 |
| Popis: | A dual beam, dual polarization, low noise receiver has been installed at a Cassegrain focus of the NASA 70[Formula: see text]m antenna near Canberra, Australia. It operates in five pairs of 1[Formula: see text]GHz bands from 17 to 27[Formula: see text]GHz simultaneously. The receiver temperature measured at the feed is 21–22[Formula: see text]K at 22[Formula: see text]GHz and, during dry winter night-time conditions, zenith system temperatures as low as 35[Formula: see text]K have been observed in the 21–22[Formula: see text]GHz 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 1000[Formula: see text]MHz wide. For spectroscopy, four ROACH1 signal processors each currently providing 32[Formula: see text]K channel spectra across four 1000[Formula: see text]MHz bands, for 0.4[Formula: see text]km/s velocity resolution at 22[Formula: see text]GHz. Using both beam- and position-switching, the receiver achieved a noise level of 5[Formula: see text]mK r.m.s. in an hour of integration and 31[Formula: see text]kHz resolution. The NASA 70[Formula: see text]m antennas have a 45 arcsec beamwidth at 22[Formula: see text]GHz and an aperture efficiency of 35.5% giving a sensitivity of 0.49[Formula: see text]K/Jy. |
| Databáze: | OpenAIRE |
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