secondary signal

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• Secondary surveillance radar — SSR antenna of Deutsche Flugsicherung at Neubrandenburg, in Mecklenburg/Western Pomerania Secondary surveillance radar (SSR)[1] is a radar system used in air traffic control (ATC), that not only detects an …   Wikipedia

• Signal Hill Elementary School — is the name for the following schools:*Signal Hill Elementary School (Signal Hill, California) Signal Hill, California *Signal Hill Elementary School (Belleville, Illinois) Belleville, Illinois *Signal Hill Elementary School (Dix Hills, New York) …   Wikipedia

• Signal lamp — training during World War II. A signal lamp (sometimes called an Aldis lamp, named after Arthur C. W. Aldis who invented a widely used design) is a visual signaling device for optical communication (typically using Morse code). Modern signal… …   Wikipedia

• Signal Hill, New Zealand — Signal Hill is a prominent landform in the city of Dunedin, New Zealand. It is located close to, and due north of, the head of the Otago Harbour and reaches an elevation of 393 m (1289 ft). The suburbs Ravensbourne, St. Leonards, and Opoho lie on …   Wikipedia

• Signal Corps in the American Civil War — U.S. Army Signal Corps station on Elk Mountain, Maryland, overlooking the Antietam battlefield. The Signal Corps in the American Civil War comprised two organizations: the U.S. Army Signal Corps, which began with the appointment of Major Albert J …   Wikipedia

• Signal transduction — In biology, signal transduction refers to any process by which a cell converts one kind of signal or stimulus into another. Most processes of signal transduction involve ordered sequences of biochemical reactions inside the cell, which are… …   Wikipedia

• Signal Hill, California — Infobox Settlement official name = City of Signal Hill, California settlement type = City nickname = motto = imagesize = image caption = image imagesize = image caption = image mapsize = 250x200px map caption = Location of Signal Hill in Los… …   Wikipedia

• secondary radar — A radar system wherein a radio signal transmitted from the radar station initiates the transmission of a radio signal from another station (ICAO). Examples of secondary radars are IFF (identification friend or foe) and secondary surveillance… …   Aviation dictionary

• Signal Mountain (Wyoming) — Infobox Mountain Name = Signal Mountain Photo = Caption = Elevation = convert|7720|ft|m|0|abbr=on Location = Wyoming, USA Range = n/a Prominence = convert|1040|ft|m|0|abbr=on Coordinates = coord|43|50|56|N|110|33|59|W|type:mountain… …   Wikipedia

• Secondary frequency standard — In telecommunications, a secondary frequency standard is a frequency standard that does not have inherent accuracy, and therefore must be calibrated against a primary frequency standard. Secondary standards include crystal oscillators and… …   Wikipedia

• secondary surveillance radar — A radar system that requires complementary aircraft equipment (transponder). The transponder generates a coded reply signal in response to transmissions from the ground station (interrogator). Since this system relies on transponder generated… …   Aviation dictionary