dish


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dish

A type of antenna used in radio telescopes and consisting of a large spherical or parabolic metal reflector, usually circular in outline, by means of which radio waves are brought to a focus above the dish center. The waves are collected at the focus by a secondary antenna, called a feed, or are reflected from a curved secondary to be brought to a focus elsewhere (see Cassegrain configuration). At low radio frequencies the feed may be a dipole mounted in front of a small reflector; at high frequencies it is usually a horn antenna (see waveguide). The signals picked up by the feed are transferred by means of the feeder to the receiver for amplification and analysis. Both the angular resolution and the sensitivity of the telescope to a point source increase with the area of the dish.

The dish is usually mounted so that it can be steered to point in different directions and can be made to track a moving object. Some dishes, however, can move in only one coordinate and rely on the Earth's rotation to provide coverage in the other coordinate. The 305-meter dish mounted in a natural hollow in the ground at the Arecibo radio telescope, Puerto Rico, achieves partial beam steering by moving the feed.

dish

[dish]
(electromagnetism)

dish

A parabolic reflector type of radio or radar antenna.

dish

A bowl-shaped antenna that receives signals from a satellite. See DBS and parabolic antenna.
References in classic literature ?
In the porkers he saw carved out the future sleek side of bacon, and juicy relishing ham; not a turkey but he beheld daintily trussed up, with its gizzard under its wing, and, peradventure, a necklace of savory sausages; and even bright chanticleer himself lay sprawling on his back, in a side dish, with uplifted claws, as if craving that quarter which his chivalrous spirit disdained to ask while living.
They were called on to share in the awkwardness of a rather long interval between the courses, and obliged to be as formal and as orderly as the others; but when the table was again safely covered, when every corner dish was placed exactly right, and occupation and ease were generally restored, Emma said,
Should any little accidental disappointment of the appetite occur, such as the spoiling of a meal, the under or the over dressing of a dish, the incident ought not to be neutralised by replacing with something more delicate the comfort lost, thus pampering the body and obviating the aim of this institution; it ought to be improved to the spiritual edification of the pupils, by encouraging them to evince fortitude under temporary privation.
One state resembles setting a hungry man down to a single dish, on which he may concentrate his entire appetite and do it justice; the other, introducing him to a table laid out by French cooks: he can perhaps extract as much enjoyment from the whole; but each part is a mere atom in his regard and remembrance.
On this occasion she refused one dish after another with a resolution which implied the rarest of all modern martyrdoms -- gastric martyrdom.
I was nearly going away without the pie, but I was tempted to mount upon a shelf, to look what it was that was put away so carefully in a covered earthen ware dish in a corner, and I found it was the pie, and I took it, in the hope that it was not intended for early use, and would not be missed for some time.
No food was brought, but the Barmecide pretended to help himself from a dish, and carry a morsel to his mouth, saying as he did so, "Eat, my friend, eat, I entreat.
The witch suspected no evil, and her mouth watered to taste the new dish, so that she went into the kitchen to prepare it herself.
I WILL get some worms and go fishing and catch a dish of minnows for my dinner," said Mr.
They then lifted up a fine white cloth covering fruit and a great variety of dishes of different sorts; one who looked like a student said grace, and a page put a laced bib on Sancho, while another who played the part of head carver placed a dish of fruit before him.
Coquenard drew the dish toward her, skillfully detached the two great black feet, which she placed upon her husband's plate, cut off the neck, which with the head she put on one side for herself, raised the wing for Porthos, and then returned the bird otherwise intact to the servant who had brought it in, who disappeared with it before the Musketeer had time to examine the variations which disappointment produces upon faces, according to the characters and temperaments of those who experience it.
His voice yet echoed in the archway when a handsome, graceful, and half-naked young man appeared, bearing a fowl in a silver dish on his head, without the assistance of his hands.