Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979itap...27..720v&link_type=abstract
IEEE Transactions on Antennas and Propagation, vol. AP-27, Sept. 1979, p. 720-723.
Astronomy and Astrophysics
Astronomy
1
Gravitational Effects, Radio Telescopes, Subreflectors, Astigmatism, Efficiency, Radio Astronomy, Radio Sources (Astronomy), Systems Engineering
Scientific paper
The paper deals with gravitational deformations in the 140-ft National Radio Observatory radio telescope, whose main part is of an astigmatic shape with elevation-dependent amplitude. The surface degradation can be corrected if a subreflector was deformed in a similar shape by the same amount. An experimental Cassegrain subreflector was built which can be deformed in an astigmatic mode by two stiff diagonals and four-points in-between where a motor pushes or pulls normal to the surface. Seven unresolved radio sources were observed at the water vapor line, at telescope pointings, and with different amounts of subreflector deformation. The astigmatic deformation of the subreflector provided improvements, especially far south and east. Strong secondary beams disappeared, the beamshape became more symmetrical, narrow, and round, and at 20 deg elevation the aperture efficiency increased by factors of 2 and 3.
von Hoerner Sebastian
Wong Wan Yan
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