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 ?
The rest of the family was still so surprised by the flying dish-washing capsule that nobody could say anything.
But truthfully, I can't stand it" Actor Matthew Fox, below "Kid has sexual magnetism of a half-thawed rissole" Writer Kathy Lette twitters about teenage singer Justin Bieber "Haven't they heard of dish-washing machines?
But even if you don't care for such facts, it's effective with a really rich and creamy formula, leaving even dish-washing hands refreshed and moisturised.
I noticed a strange, triumphant glint in his eyes and realised that I had been out-witted by the man, and last week's dish-washing fiasco had been anything but an accident.
THESE cotton cloths seem better suited to cleaning and dusting than dish-washing.
The company s boss added, Fairy Platinum will become the product of choice for consumers who need a dish-washing liquid that will cut through and shift the most stubborn grease in the shortest time possible.
The line includes laundry and dish-washing detergent ($3.
Today's lawsuit, in addition to seeking compensation for past medical bills, and general damages for pain and suffering, seeks punitive damages, alleging Chili's "acted in a grossly negligent manner" and "wanton and willful acts were committed with a conscious and reckless indifference to existing circumstances and conditions, and to the rights and safety of others, with such acts including, but not limited to, preparing and serving food to the public despite having a broken dish-washing machine without sanitizer in it, having no hot water available for employees to wash their hands on one day, and no water at all for part of a second day.