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directed-sector antenna

См. также в других словарях:

  • HRS antenna — HRS type antennas are more or less the standard antenna used for long distance high power shortwave broadcasting (> 1000 km). Contents 1 History of HRS design 2 Nomenclature 3 A versatile antenna type …   Wikipedia

  • Media and Publishing — ▪ 2007 Introduction The Frankfurt Book Fair enjoyed a record number of exhibitors, and the distribution of free newspapers surged. TV broadcasters experimented with ways of engaging their audience via the Internet; mobile TV grew; magazine… …   Universalium

  • History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… …   Wikipedia

  • Defence Research and Development Organisation — Sanskrit: बलस्य मूलं विज्ञानम् Strength s Origin is in Science [1] Agency overvi …   Wikipedia

  • broadcasting — /brawd kas ting, kah sting/, n. 1. the act of transmitting speech, music, visual images, etc., as by radio or television. 2. radio or television as a business or profession: She s training for a career in broadcasting. [1920 25; BROADCAST + ING1] …   Universalium

  • space exploration — Investigation of the universe beyond Earth s atmosphere by means of manned and unmanned spacecraft. Study of the use of rockets for spaceflight began early in the 20th century. Germany s research on rocket propulsion in the 1930s led to… …   Universalium

  • MIM-104 Patriot — Patriot system of the German Luftwaffe Type Mobile Surface to air missile system Place of …   Wikipedia

  • Mill Valley Air Force Station — Part of Air Defense Command (ADC) Mount Tamalpais West Peak, Marin County, near …   Wikipedia

  • Psychological Operations (United States) — Infobox Military Unit unit name=United States Psychological Operations caption= dates= country=United States allegiance=Federal branch= type= role= |size=|command structure=Active Army U.S. Army Special Operations Command (USASOC) Reserve Army… …   Wikipedia

  • radar — /ray dahr/, n. 1. Electronics. a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns. 2. a means or sense of awareness or… …   Universalium

  • Distant Early Warning Line — DEW redirects here. For energy emitting weapons, see Directed Energy Weapons. USAF Distant Early Warning Line and Distant Early Warning System Office Emblem …   Wikipedia

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