Computer Science – Performance
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976s%26t....52..320.&link_type=abstract
Sky and Telescope, vol. 52, Nov. 1976, p. 320-322.
Computer Science
Performance
Antenna Arrays, Radio Telescopes, Assembling, Performance Tests, Very Large Array (Vla), Waveguides
Scientific paper
The present phase in assembling and testing the Very Large Array (VLA) aperture-synthesis radio telescope is reported. Six of the 28 VLA antennas, which will form a Y-shaped configuration with 13-, 13-, and 11.8-mile-long arms, were built and operationally tested by early September 1976. The last of the antennas is planned to be integrated in 1979. The tests on the installed portion of the buried wave guide showed an attenuation of the signal at 50 GHz of only 1.4 dB/km. By the end of 1976 a limited schedule of scientific observations should start, first with three antennas, then with six by mid-1977, and probably with 10 by that year's end. The full number of antennas will provide a total of 351 interferometer pairs whose outputs will be combined by the computer. The VLA will be able to generate a radio map of any portion of the sky with a resolving power like that of a conventional paraboloidal dish 17 miles in diameter. The telescope should provide resolution of about 0.6 sec of arc at 6-cm wavelength, or 2.1 sec of arc at 21-cm wavelength of neutral hydrogen. The sharpness of these radio maps will be comparable to that of photographs taken with the 200-inch Hale reflector at Palomar Observatory.
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