Radio observatories are preferentially located far from major centers of population to avoid electromagnetic interference (EMI) from radio, television, radar, motor vehicles, and other man-made electronic devices. They may be used individually or linked together electronically in an array. Radio telescopes are typically large parabolic ("dish") antennas similar to those employed in tracking and communicating with satellites and space probes. Since astronomical radio sources such as planets, stars, nebulas and galaxies are very far away, the radio waves coming from them are extremely weak, so radio telescopes require very large antennas to collect enough radio energy to study them, and extremely sensitive receiving equipment. Unlike optical telescopes, radio telescopes can be used in the daytime as well as at night. Radio telescopes are the main observing instrument used in radio astronomy, which studies the radio frequency portion of the electromagnetic spectrum emitted by astronomical objects, just as optical telescopes are the main observing instrument used in traditional optical astronomy which studies the light wave portion of the spectrum coming from astronomical objects. Consists of an array of 2040 cage dipole elements.Ī radio telescope is a specialized antenna and radio receiver used to detect radio waves from astronomical radio sources in the sky. Antenna of UTR-2 low frequency radio telescope, Kharkiv region, Ukraine.
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