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.

Collins Dictionary of Astronomy © Market House Books Ltd, 2006

dish

[dish]
(electromagnetism)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

dish

A parabolic reflector type of radio or radar antenna.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved

dish

A bowl-shaped antenna that receives signals from a satellite. See DBS and parabolic antenna.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
There were also issues about control procedures, including the dishwater operating temperature, the temperature of the storage rooms and areas such as a raw meat preparation area not being used.
There was a strict hose pipe ban, people shared bath water and slopped dirty dishwater on flower beds in a bid to save their plants.
And what about Vardy's Leicester team-mate Danny Drinkwater, or should I say dishwater? His name tells one he has a thirst for success but, I'm afraid, little else.
Tory MSP Gavin Brown, who also leaves Parliament in May, said other opportunities to quiz ministers are "dull as dishwater".
Kathy Etchingham, who dated the iconic guitarist for 3 years before he found fame, told the New York Post that the Andre Benjamin starrer film is ridiculous, sexist and "dull as dishwater".
So, for flushing the toilet, "if it's yellow leave it mellow, if it's brown flush it down." If possible use the bathwater to flush the toilet, fill the washing machine, or water plants (use the dishwater for this, too).
Apart from one or two, their Christmas Day programmes were as dull as dishwater.
TO call him dull as dishwater is unfair to dishwater.
The calf's foot jelly, which is the colour of dirty dishwater, was also a culinary delicacy.
Her appalling mother - who clearly thinks she could have done better and Her Dull As Dishwater Dad.
If the first half was entertaining, the start of the second was as dull as dishwater and the game limped along at a pedestrian pace until the start of the final quarter when Cull kicked his second penalty.
This dull as dishwater, so-called horror is another remake - but this time it's one that should have been left alone.