A 45-m telescope with a surface accuracy of 65 μm.

Details A 45-m telescope with a surface accuracy of 65 μm. A 45-m telescope with a surface accuracy of 65 μm.

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ieeep..82..725u&link_type=abstract

Proc. IEEE, Vol. 82, No. 5, p. 725 - 733

Physics

7

Radio Telescopes: Antennas, Radio Telescopes: Accuracies

Scientific paper

The Nobeyama 45-m telescope has been upgraded for higher frequency and higher sensitivity observations. The surface accuracy of the antenna was improved from 0.2 mm rms to 65 μm rms using a radio holography method at the prime focus. Pointing accuracy was also improved by replacing a large Gregorian subreflector cabin with a smaller cassegrain subreflector in 1985 to reduce wind loading effects, and by installation of a new master collimator with multi-pole resolvers which were calibrated to an accuracy of 0.4 arcsec rms in 1988. Four SIS receivers using Nb/AlOx/Nb array junctions are now available on the telescope for 40, 80, 100, and 150-GHz bands. These receivers achieved quite low noise and wide-band tunability. The 2×2 multi-beam receiver for 115 GHz is very powerful for mapping observations.

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