A horn is a stationary
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Horn — may refer to: * Horn (anatomy), the pointed projection of the skin of various animals, as an organ or its material * Horn (surname)In music and sound * Horn (instrument), sometimes called a French horn, a brass musical instrument constructed of… … Wikipedia
Horn antenna — Pyramidal microwave horn antenna, with a bandwidth of 0.8 to 18 GHz. A coaxial cable feedline attaches to the connector visible at top. This type is called a ridged horn; the curving fins visible inside the mouth of the horn increase the antenna… … Wikipedia
Horn (telecommunications) — In telecommunications, the term horn has the following meanings:* In radio transmission, an open ended waveguide, of increasing cross sectional area, which radiates directly in a desired direction or feeds a reflector that forms a desired beam.… … Wikipedia
Horn Antenna — Infobox nrhp name =Horn Antenna nrhp type = nhl caption = location= Holmdel, New Jersey USA lat degrees = 40 lat minutes = 23 lat seconds = 29.43 lat direction = N long degrees = 74 long minutes = 11 long seconds = 6.91 long direction = W… … Wikipedia
telescope — /tel euh skohp /, n., adj., v., telescoped, telescoping. n. 1. an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens… … Universalium
Feed horn — In satellite dish and antenna design parlance, a feedhorn (or feed horn) is a horn antenna used to convey radio waves between the transceiver (transmitter and/or receiver) and the reflector. The feedhorn also selects the polarity of the waves to… … Wikipedia
Green Bank Telescope — Infobox Telescope name = Green Bank Telescope organization = NRAO location = Green Bank, West Virginia, USA coords = coord|38|25|58.23|N|79|50|21.88|W|display=inline,title wavelength = radio built = 1991 2002 first light = August 22, 2000 style … Wikipedia
Parabolic antenna — A parabolic satellite communications antenna at Erdfunkstelle Raisting, the biggest facility for satellite communication in the world, in Raisting, Bavaria, Germany. It has a Cassegrain type feed. A parabolic antenna is an antenna that uses a… … Wikipedia
List of Dutch inventions and discoveries — History of the Netherlands This article is part of a series Early History … Wikipedia
Phénomène lunaire transitoire — Un phénomène lunaire transitoire (PLT)[1] consiste dans l apparition d une lumière ou d une modification d aspect de la surface lunaire pendant une courte durée. Des signalements de tels phénomènes remontent à plus de mille ans, certains d entre… … Wikipédia en Français
