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 periodicals archive ?
Rebecca, who co-presents Dishing The Dirt with This Morning chef Phil Vickery, says: "It's true I could have done something different - either something totally different with my life or at least somepresented thing different within television - but I am naturally drawn to programmes such as Dishing The Dirt.
I'll be dishing the dirt on what went on behind the smiles and posed photographs during my training programmes with various Merseyside sporting clubs and also publishing plenty of pictures that never quite made it into my weekly sports column.
IT made a change from dishing the dirt on each other as housemates performed a big clean-up yesterday.
Spears got together with her former manager early this year for a few months to try and reignite her career and it's thought he's keen to avoid dishing the dirt on a former client.
Anyhow, the best she can do on dishing the dirt on poor Micky 'The Nose' is that they did have sex, and then things started to turn ugly.
He suggested he would be dishing the dirt on his fourdecade-long career.
TWENTY five years after his death, and 37 years after the break-up of their marriage, Cynthia Lennon is dishing the dirt on her ex-Beatle husband.
when Parliament hacks hold their annual dinner and invite their favourite politicians - ie, the accommodating ones who spend the rest of the year dishing the dirt.