dish

(redirected from dishwater)
Also found in: Dictionary, Thesaurus, Medical, Idioms.

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 ?
It got particularly bad when oven heat hit Moreno's eyes or steam built up from the dishwater, said Kanokwan Maliwan, a waitress at the restaurant and sister of the owner.
The pan can be washed gently in dishwater without destroying the finish.
But now it is dull as dishwater, so uber cool resident Nick Grimshaw is planning to pack up his vintage bags and move East.
The world No 14's girlfriend, Kim Sears, posted pictures on his personal website showing him emptying his dishwater in a pair of Marigolds.
Stand director Tommy Sheppard said: "Politics today is as dull as dishwater, with most parties trying to occupy the centre ground.
But according to younger resident Nick Grimshaw, it's dull as dishwater in NW1 these days.
Paddy Casey Saints And Sinners ##### THE astonishingly burgeoning market for middle-of-the-road Irish troubadours should stand Paddy Casey in good stead as he makes inroads on the likes of Damien Rice and David Gray, but this is dull as dishwater.
Tim McMahon Pembroke Dock, Pembs I CAN'T contain my utter disappointment at the dull as dishwater line-up on C5's Celebrity Big Brother, especially considering how much fun the last series was.
It's as dull as dishwater and is not even worthy of background music status.
Unlike the rest of the dull as dishwater cast she's mischievous, cheeky and a complete stunner.
His latest move to sub-David Gray sensitivity features tunes ranging from undistinguished to dishwater dull.
These two leads are, to be honest, dull as dishwater, but Hitchcock was by this time picking up a nice line in elegant, enigmatic villains.