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Topic: Radio telescope


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In the News (Mon 19 Aug 19)

  
  Radio telescope - Wikipedia, the free encyclopedia
The largest radio telescope in Europe is the 100 meter diameter antenna in Effelsberg, Germany, which also was the largest fully steerable telecope for 30 years until the Green Bank Telescope was opened in 2000.
The largest radio telescope in the United States until 1998 was Ohio State University's The Big Ear.
Grote Reber (December 22, 1911 – December 20, 2002) was one of the pioneers of radio astronomy.
en.wikipedia.org /wiki/Radio_telescope   (729 words)

  
 Ooty - Radio Telescope   (Site not responding. Last check: 2007-10-23)
The Radio Astronoimy centre (RAC) is part of the National centre of Radio Astrophysics (NCAR) of the well known Tata Institute of Fundamental Research (TIFR) which is funded by the Government of India through the Deprtment of atomic Energy.
Radio astronomy is the study of the universe through radio waves reaching us from its many constituents such as the sun, planets, stars, galaxies, etc. This new branch of science was born 1932 when Karl Jansky discovered radio noise coming from our milky Way Galaxy.
The Ooty radio telescope (ORT), as it is known is cylindrical paraboloid reflecting surface, 530m long and 30m wide, placed on a hill whose slope of about 11degree in the north-south direction is the same as the latitude of the RAC.
www.ooty.com /travel/radiotelescope.htm   (779 words)

  
 Arecibo Observatory - Wikipedia, the free encyclopedia
The telescope is visually distinctive and has been used in the filming of two notable motion pictures: as the villain's antenna in the James Bond movie GoldenEye and as itself in the film Contact.
The Arecibo telescope is distinguished by its enormous size: the main collecting dish is 305 m in diameter, constructed inside the depression left by a karst sinkhole.
The Arecibo telescope's dish surface is made of 38,778 perforated aluminium panels, each measuring about 1 m by 2 m (3 ft by 6 ft), supported by a mesh of steel cables.
en.wikipedia.org /wiki/Arecibo_Observatory   (1463 words)

  
 radio telescope
Radio telescopes usually consist of a metal bowl that collects and focuses radio waves the way a concave mirror collects and focuses light waves.
Radio telescopes are much larger than optical telescopes, because the wavelengths they are detecting are much longer than the wavelength of light.
This technique was pioneered by English radio astronomer Martin Ryle at the Mullard Radio Astronomy Observatory, Cambridge, England, site of a radio telescope consisting of eight dishes in a 5-km/3-mi line.
bbs.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0005747.html   (409 words)

  
 The 305 meter telescope
Those who see the Arecibo radio telescope for the first time are astounded by the enormousness of the reflecting surface, or radio mirror.
By aiming a feed antenna at a certain point on the reflector, radio emissions originating from a very small area of the sky in line with the feed antenna will be focused on the feed antenna.
Other radio telescopes may require several hours observing a given radio source to collect enough energy for analysis whereas at Arecibo this may require just a few minutes of observation.
www.naic.edu /public/the_telescope.htm   (669 words)

  
 National Park Service: Astronomy and Astrophysics (Reber Radio Telescope)
The Reber Radio Telescope was designed and built by Grote Reber in 1937 for his personal use in conducting research in the newly emerging field of radio astronomy.
The telescope was originally a 31 foot 5-inch transit-mounted parabolic radio telescope reflector made from 72 wooden radial rafters, covered with skin of 26 gauge point iron (focal length: 20 feet), and 2 elevated arches positioned on railroad wheels to permit changes in elevation angles.
The telescope now stands on its 1948 turntable to the left of the entrance road of the National Radio Astronomy Observatory, in Green Bank, West Virginia, in proximity to the Karl Guthe Jansky Replica Antenna and the Ewen-Purcell Antenna.
www.cr.nps.gov /history/online_books/butowsky5/astro4o.htm   (1669 words)

  
 Radio Waves   (Site not responding. Last check: 2007-10-23)
Radio telescopes are dishes made out of conducting metal that reflect radio waves to a focus point.
Because the wavelengths of radio light are so large, a radio telescope must be physically larger than an optical telescope to be able to make images of comparable clarity.
Radio telescopes look toward the heavens at planets and comets, giant clouds of gas and dust, and stars and galaxies.
imagers.gsfc.nasa.gov /ems/radio.html   (566 words)

  
 Ooty Radio Telescope
The large radio telescope near Ootacamund (Ooty) was set up by TIFR radio astronomers, in the picturesque Nilgiri Hills of South India in 1970.
Designed and built in India, the Ooty Radio Telescope (ORT) is an off-axis parabolic cylinder 530 m long and 30 m wide operating at a nominal frequency of 326.5 MHz with a maximum bandwidth of 15 MHz at the front-end.
The telescope is currently being used mainly for the study of pulsars, radio recombination lines and interplanetary scintillations.
www.ncra.tifr.res.in /ncra_hpage/ort/ort.html   (966 words)

  
 Radio Astronomy and SETI - Big Ear Radio Observatory Home Page
This website is meant to serve as a memorial to that unique radio telescope, to its designer and builder (the late Dr. John D. Kraus) and the many persons involved with the telescope, and to the discoveries made with that instrument.
The Observatory was named after the Big Ear Radio Telescope (demolished in 1998) -- a Kraus-type radio telescope (named for Dr. John D. Kraus, the founder and director of the observatory, who was also the designer and builder of the telescope).
The telescope was famous for discovering some of the most distant known objects in the universe, as well as for the "Wow!" Signal and the longest-running SETI (Search for ExtraTerrestrial Intelligence) project entered into the Guinness Book of Records.
www.bigear.org   (613 words)

  
 Frequently Asked Questions About Radio Astronomy
Radio observations as part of a Search for Extraterrestrial Intelligence (SETI) have been done by different groups of researchers for a number of years, but this type of work is not a part of NRAO observational programs.
In fact, the world's second radio telescope was built by an amateur radio operator, Grote Reber, in 1937.
Amateur radio operators pursue a number of activities that are somewhat related to radio astronomy, including communicating by bouncing radio signals off the Moon and the ionized trails of meteors in the Earth's atmosphere.
www.aoc.nrao.edu /intro/faq.html   (1395 words)

  
 MPIfR: Public
Since its earliest beginnings in 1932 radio astronomy has developed into one of the most important means of investigating the Universe.
large aperture of the dish of about 7850m² is important for the detection of the extremely weak radio signals, while the large diameter of 100m is the reason for a comparatively high angular resolution, i.e.
At 1.3cm radio wavelength this resolution is 35 arc seconds, about 80stwice as good as that of the human eye at optical wavelengths.
www.mpifr-bonn.mpg.de /public/eff_e.html   (489 words)

  
 Radio Telescopes   (Site not responding. Last check: 2007-10-23)
Although they do not look like optical telescopes, radio telescopes are built to accomplish the same gathering and focussing tasks on radio frequency radiation that reflecting telescopes perform on visual frequency light.
Radio telescopes are used for many purposes, but let us describe two here explicitly: the mapping of neutral hydrogen concentrations using the 21 centimeter spin-flip transition in hydrogen, and the use of multiple radio telescopes operated as if they were a single telescope of very high resolution.
Thus, radio telescopes tuned to this frequency can be used to map the great clouds of neutral hydrogen found in interstellar space.
csep10.phys.utk.edu /astr162/lect/light/radio.html   (394 words)

  
 SPACE.com -- Arecibo: Celestial Eavesdropper
For 37 years radio astronomers at the Arecibo Observatory have used this, the world's largest radio telescope, to fathom the radio signals of the cosmos.
Their resulting emissions of strong, pulsed radio waves are due to the spinning of the remaining star.
Radio astronomy was born early in the 20th century when scientists tried to understand why hiss-like static was constantly plaguing their first transatlantic radio transmissions.
www.space.com /scienceastronomy/astronomy/arecibo_profile_000508.html   (2150 words)

  
 Electromagnetic Spectrum
Radio waves have photons with low energies, microwaves have a little more energy than radio waves, infrared has still more, then visible, ultraviolet, X-rays, and gamma-rays.
Radio waves CAN make it through the Earth's atmosphere without significant obstacles (In fact radio telescopes can observe even on cloudy days!).
Radio astronomers can combine data from two telescopes that are very far apart and create images which have the same resolution as if they had a single telescope as big as the distance between the two telescopes!
imagine.gsfc.nasa.gov /docs/science/know_l2/emspectrum.html   (2319 words)

  
 It takes more than one kind of telescope to see the light   (Site not responding. Last check: 2007-10-23)
Although the first telescope was created 400 years ago, we didn't have a complete picture of the electromagnetic spectrum until the early part of this century.
Radio telescopes also need to be large in order to overcome the radio noise, or "snow," that naturally occurs in radio receivers.
An example of a modern radio telescope is The Very Large Array in New Mexico (right), composed of 27 antennas electronically combined to give the resolution of an antenna 36 kilometers (22 miles) across.
science.nasa.gov /newhome/headlines/features/ast20apr99_1.htm   (2687 words)

  
 Radio Telescope Resources   (Site not responding. Last check: 2007-10-23)
The original low frequency telescope was superseded in 1976 by a 14-m diameter radome-enclosed antenna for use at high radio frequencies (mm wavelengths), built primarily to study the physics and chemistry of interstellar clouds, circumstellar envelopes, planetary atmospheres, and comets.
The Nançay Radio Observatory is a scientific department (the Unité Scientifique de Nançay) of the Observatoire de Paris, and it is also associated to the CNRS (the French National Scientific Research Centre).
The radio telescope at Radio Astronomy at the University of Indianapolis is a 5 meter educational radio telescope.
cdsweb.u-strasbg.fr /astroweb/cat-radio.html   (7160 words)

  
 radio-telescope for radio astronomy
The article was not particularly strong on the electronics (which we are) but reasonably comprehensive on basic radio astronomy for radio telescopes (which we are not).
At the threshold of VHF a low noise preamplifier is obligatory to establish as low a noise figure as is possible for a radio telescope to overcome the limitations of inherent receiver noise.
In this case we present our radio telescope antenna input after the balun to a 30 Mhz (nominal) two stage low pass filter.
my.integritynet.com.au /purdic/radio-telescope.htm   (4980 words)

  
 radio telescope
Its principle of operation is broadly similar to that of an optical telescope, the major practical differences being forced by the fact that radio waves are much longer than waves of visible light.
Since resolving power decreases as wavelength increases, very large instruments are needed to provide useful information about the structure of radio sources.
Indeed, to distinguish the same level of detail in a source emitting 21-centimeter radio waves as can be achieved by a large optical telescope, a radio dish would need a diameter of about 100 km (60 miles).
www.daviddarling.info /encyclopedia/R/radiotel.html   (224 words)

  
 Big Ear Radio Observatory - Frequently Asked Questions
At the time Big Ear recorded the radio signal that later became known as the "Wow!" signal (based on the notation that Dr. Jerry Ehman wrote in the margin of the computer printout), there was no audio recording equipment attached to the output of that radio telescope.
We began to pursue the concept of an "Argus" type radio telescope originally conceived by Dr. Robert S. Dixon (who was the Assistant Director of the Big Ear Radio Observatory under Dr. John D. Kraus, the Director).
This is in contrast to the situation with big radio telescopes that have just one (or possibly a very small number) of very small (i.e., narrow in each dimension) beams in the sky at once.
www.bigear.org /faq.htm   (1840 words)

  
 Radio Astronomy Telescope Project
This is a description of my 1420 MHz radio telescope project for observing the natural radio emissions of neutral hydrogen atoms found throughout space.
Specifically, the study of the radio spectra of these emissions is used to determine the distribution and dynamics of hydrogen throughout our galaxy.
I have been interested in radio astronomy for years but have only recently been able to find the time to assemble my own radio telescope.
www.signalone.com /radioastronomy/telescope   (1465 words)

  
 Visit Parkes CSIRO Radio Telescope
Built virtually in the shadow of the 64 metre dish, the visitors centre primarily caters for public curiosity about the radio telescope and astronomy, through contact with over 100,000 visitors per year and the handling of telephoned and written enquiries from students, members of the public and media from all parts of Australia.
The Parkes Radio Telescope is 20 km north of Parkes on the Newell Highway, the main highway between Brisbane and Melbourne.
A 21 minute presentation about the telescope, radio astronomy, the history of radio astronomy and some of the achievements of the astronomers who use the Parkes telescope.
www.outreach.atnf.csiro.au /visiting/parkes   (451 words)

  
 National Radio Astronomy Observatory
The National Radio Astronomy Observatory (NRAO) is one of the world's premier research facilities for radio astronomy.
Associated Universities, Inc., and the National Radio Astronomy Observatory are pleased to announce that the 41st annual Karl G. Jansky Lectureship has been awarded to Professor Frank J. Low, a pioneer in the development of millimeter and infrared astronomy.
Prospective proposers are reminded that the next Large Proposal deadline for the NRAO telescopes is October 2, 2006.
www.nrao.edu   (380 words)

  
 Astronomy/Astrophysics - MOST
The telescope is located near Canberra, and was constructed by modification of the East-West arm of the former One-Mile Mills Cross telescope.
Although the telescope uses the well-known principle of rotational synthesis by an East-West array, the method by which this is realised is a novel one.
The telescope was recently awarded funding by the Australian Government under the MNRF scheme to prototype technologies relevant to the next generation radio telescope, the Square Kilometre Array (SKA).
www.physics.usyd.edu.au /astrop/most   (580 words)

  
 JBO - Lovell Telescope   (Site not responding. Last check: 2007-10-23)
For over 40 years the giant Lovell Telescope at Jodrell Bank has been a familiar feature of the Cheshire landscape and an internationally renowned landmark in the world of astronomy.
Even now, it remains one of the biggest and most powerful radio telescopes in the world, spending most of its time investigating cosmic phenomena which were undreamed of when it was conceived.
These pages describe how the telescope was built, how it works, and some of the exciting projects in which it has been engaged.
www.jb.man.ac.uk /tech/lovell   (137 words)

  
 BBC News | Sci/Tech | Plans hatched for giant telescope
Astronomers are planning to build the world's largest radio telescope sometime in the next decade and one team of astronomers hope that it will be built in Australia.
Their proposal for the new telescope would look like an army of "eggs on legs" according to the director of Australia Telescope National Facility, Professor Ron Ekers.
The telescope will have an area of at least a square kilometre and be far more powerful than existing radio telescopes but Professor Ekers said that neither the telescope's site nor its exact design would be decided for a few years yet.
news.bbc.co.uk /1/hi/sci/tech/473559.stm   (448 words)

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