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 ?
She answered "All right, Ethan," and he heard her singing over the dishes as he went.
For, sure enough, when she looked at the dishes they had a moment before left upon the table, she found them all washed and dried and piled up into neat stacks.
Anne washed the dishes deftly enough, as Marilla who kept a sharp eye on the process, discerned.
These- yes, these must go among the carpets," she said, referring to the Saxony china dishes.
The table was comfortably laid - no silver in the service, of course - and at the side of his chair was a capacious dumb-waiter, with a variety of bottles and decanters on it, and four dishes of fruit for dessert.
The table-linen was of the most beautiful damask, and the plates and dishes of real china, an article of great luxury at this early period of American commerce.
Dirk Stroeve flattered himself on his skill in cooking Italian dishes, and I confess that his
The dishes were of precious metals set with brilliant jewels and the good things to eat which were placed upon them were countless in number and of exquisite flavor.