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 ?
Taking down the bottle of "Cleverness" she added some of the powder to the heap on the dish.
Margolotte now carried the dish of brains to the bench.
Sometimes the taste is so good, even an unattractive-looking dish is deemed outstanding.
amp; NEW YORK -- EchoStar Communications Corporation (Nasdaq: DISH) and its DISH Network(TM) satellite TV service today announced the launch of A&E HD, a high definition simulcast of the network's blockbuster lineup.
Dish of the year: Unexpected, nonstewlike beef bourguignon arrangement of tender cubed beef, mushrooms and celery on a bed of horseradish-flavored mashed potatoes.
These new offerings are a great example of DISH Network's ability to enhance customers' set top boxes with the latest interactive technology," stated Michael Kelly, executive vice president of Commercial & Business Services for EchoStar.
Dish of the year: Entree-size order of black mussels poulette (plump mussels en shell) in a white wine and shallot broth served with pommes frites.
amp; NEW YORK -- EchoStar Communications Corporation (NASDAQ: DISH) and its DISH Network(TM) satellite TV service today announced an agreement with New Line Cinema to carry the studio's current and catalog titles on its Video On Demand platform, DISH On Demand, as well as Pay-Per-View services.
It can be a simple or complex dish, one that's familiar or not, innovative or traditional, even a grouping from which choices are made.
With DISH Network High-Speed Internet powered by WildBlue, they now have access to affordable broadband Internet via satellite with speeds comparable to DSL or cable modem - without the need for an additional phone line.
Dish of the year: Bargain-priced, flavorful, tender, expensive Kobe beef on baby arugula with crumbled bleu cheese, sweet Maui onion, and orange muscat grape aged balsamic vinaigrette.
This show of solidarity inspired DISH Network to award all seven contestants a trip to the 2007 Pro Bowl.