back azimuth 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

• 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

• Rhombic antenna — signal gathering action compared to other end fire, backfire and traveling wave types. A rhombic antenna is a broadband directional antenna co invented by Edmond Bruce and Harald Friis,[1] mostly commonly used in HF (high frequency, also called… …   Wikipedia

• Front-to-back ratio — In telecommunication, the term front to back ratio has two meanings. The first refers to when an antenna, the gain in a specified direction, i.e. , azimuth, usually that of maximum gain, compared to the gain in a direction 180° from the specified …   Wikipedia

• Microwave landing system — The NASA 737 research aircraft on the Wallops runway in 1987 with the Microwave Landing System equipment in the foreground. A microwave landing system (MLS) is an all weather, precision landing system originally intended to replace or supplement… …   Wikipedia

• Type 381 Radar — Infobox Radar name = Type 381 caption = Type 381 radar deployed on Luhai class DDG. Photo taken at IMDEX 2003. country = People s Republic of China introdate = unknown number = unknown type = 3D Air Search frequency = C band range = 100 km (60… …   Wikipedia

• опорная точка — 3.7 опорная точка (reference position): Точка, в которой измеряют уровень звука (эквивалентный уровень звука) или уровень звукового давления для контроля идентичности характеристик источника шума при проведении испытаний с экраном и без экрана (5 …   Словарь-справочник терминов нормативно-технической документации

• 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

• 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

• 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

• VHF omnidirectional range — This article is about the radio navigation aid. For other uses, see Vor. D VOR (Doppler VOR) ground station, co located with DME …   Wikipedia