Results 221 to 230 of about 1,099,186 (283)

Prism beamswitch for radio telescopes

Review of Scientific Instruments, 1978
A dielectric prism and switching mechanism have been constructed for beamswitching a Cassegrain radio telescope. Spatially extended radio sources may be mapped without significant confusion utilizing the sensitivity and stability inherent in the conventional Dicke radiometer.
J M, Payne, B L, Ulich
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Radio Telescope

Physics Today, 1963
The new 150-foot radio telescope of the Air Force Cambridge Research Laboratories Sagamore Hill Radio Astronomy Observatory at Hamilton, Mass., is reported in partial operation. The reflector, which was placed on its supporting towers last September, is capable of motion in the horizontal plane and is now being used to view radio sources as they rise ...
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Radio telescope for millimeter wavelengths.

Journal of Spacecraft and Rockets, 1964
A 16-ft-diam radio telescope has been built to operate at frequencies up to 140 Gc (2.15-mm wavelength). The expected gain at 140 Gc is 72.5 db. Measured gain at 70 Gc is greater than 67.8 db with a beamwidth of 3.7 min of arc. The parabolic reflector comprises Invar honeycomb panels supported by a welded Invar truss; its surface is precision-swept ...
R. FISHER, H. HOARD, F. ONIANS
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Radio Telescope

Physics Today, 1961
Plans to construct a new radio telescope, perhaps as large as 250 feet in diameter, were disclosed recently by the National Aeronautics and Space Administration to the Senate Aeronautical and Space Science Committee. A request for funds to start construction of the facility, to be located at Goldstone, Calif., was included in a tentative NASA budget ...
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Radio Astronomy and Radio Telescopes

2010
An astronomical object somewhere in the Planetary System, the Galaxy, a Cluster of Galaxies, or far out in the Universe may generate radio waves by one or the other physical process (a topic of Astrophysics). If the radio emission is generated inside the object, some of the radio waves propagate through the object until they may leave the radio source ...
Albert Greve, Michael Bremer
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Introduction to Radio Astronomy and Radio Telescopes

2020
Radio astronomy studies the physics and chemistry of cosmic sources and cosmic phenomena at the radio wave spectrum. Radio telescopes are built to detect radiation within this spectrum. This chapter provides a historical walkthrough on the development of radio astronomy and radio telescopes.
Kim Ho Yeap, Kazuhiro Hirasawa, Humaira Nisar   +2 more
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Radio-Telescope Antenna Parameters

IEEE Transactions on Military Electronics, 1964
Principal antenna parameters which are useful in characterizing the electrical performance of radio-telescope antennas are defined and the relations between them are established. The application of these parameters to radio astronomical measurements is discussed.
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Diversions of a radio telescope

Notes and Records of the Royal Society, 2008
The first use of the 250-foot radio telescope at Jodrell Bank, an instrument designed for academic research, was as a radar, when it obtained echoes from the rocket launcher of Sputnik 1 in October 1957. It was soon realized that this was the only radar system capable of detecting intercontinental missiles soon after their launch from within the USSR ...
Sir Francis Graham-Smith, Sir Bernard Lovell   +1 more
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A refracting radio telescope

Radio Science, 1977
Observations of extraterrestrial radio sources at the lower end of the radio frequency spectrum are limited by reflection of waves from the topside ionosphere and by the large size of antenna apertures necessary for the realization of narrow beamwidths. The use of the ionosphere as a lens is considered.
Paul Bernhardt, A. V. da Rosa
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Radio Telescopes: The Future

2007
The Square Kilometer Array (SKA) may yet become the world’s largest radio telescope, consisting of thousands of antennas (both dishes and dipoles) spread over isolated, semi-desert regions of South Africa and Australia.
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