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| name = Radio-frequency engineering | official_names = Radio-frequency engineer ...

{{for|the New Zealand organization|Amateur Radio Emergency Communications}} [[File:Camporee.JPG|thumb|right|300px|Solar-powered Amateur Radio Station in tents. Note the portable [[VHF]]/[[UHF]] [[satellite]] and [[Hig ...

...ertains to the study and design of [[microwave]] circuits, components, and systems. Fundamental principles are applied to analysis, design and measurement tec ...antenna (radio)|antennas]], [[radar]], [[transmission line]]s, space based systems ([[remote sensing]]), measurements, microwave radiation hazards and safety ...

...r protrusions. The discharge creates a broad-band radio frequency [[Noise (radio)|noise]] from [[direct current|DC]] to 1000 MHz, which can affect airc ...as to allow the continuous operation of navigation and radio communication systems, static wicks are installed on the trailing edges of aircraft. These includ ...

...tte (radio)|Superette]] [[Superheterodyne receiver|superheterodyne]] table radio]] ...(product)|models]] and [[brand]]s of [[Transmitter|radio transmitters]], [[radio receiver|receivers]] and [[transceiver]]s, both actively manufactured and d ...

...of the [[electromagnetic spectrum]] at the same time. While traditional [[military camouflage]] attempts to hide an object in the [[visible spectrum]], multi- ...project concluded in 2004 that while "the multispectral signatures of most military equipment can be significantly reduced by combinations of various camouflag ...

...that each system's functionality takes into account the presence of other systems.]] ...ork will incorporate numerous remote sensing modalities and communications systems, making the problem of achieving RF convergence intangible. ...

...epts/349/}}</ref> One of the most well-known and commonly used positioning systems is the [[Global Positioning System]] (GPS). === Interplanetary systems === ...

...], or for traffic signalling such as in [[Railway semaphore signal|railway systems]], or [[traffic light]]s in cities.<ref>{{Cite web|title=Semaphore - Traffi ...te book | editor-first = Christopher H. | editor-last = Sterling | title = Military Communications: From Ancient Times to the 21st Century | year = 2008 | loca ...

...raft's 24–28 V DC to 500 V DC for the transmitter. [[Dübendorf]] Museum of Military Aviation]] ...s.<ref name=arrl1976>[https://archive.org/details/RadioAmateurHandbook1976 Radio Amateur's Handbook], 1976, pub. [[ARRL]], p331–332</ref> Typically the moto ...

...de a [[standby generator]], batteries and other apparatus. Emergency power systems are installed to protect life and property from the consequences of loss of ...rchiveBot |fix-attempted=yes }}</ref> equipment and ships. Emergency power systems can rely on [[Engine-generator|generators]], [[deep-cycle battery|deep-cycl ...

{{Short description|Artificial satellite that relays radio signals}} ...are used for [[television]], [[telephone]], [[radio]], [[internet]], and [[military]] applications.<ref>{{cite encyclopedia|last=Labrador |first=Virgil |url=ht ...

...vernment|non-commercial]] and [[military]] [[business unit|business]] or [[Military unit|combat]] and [[logistics|logistic]] subunits. It can also mean the rel ...l power."<ref>Joint Publication 1-02: "Department of Defense Dictionary of Military and Associated Terms", Washington D.C., 12 April 2001 (as amended through 1 ...

{{Short description|Technology that can be used for both peaceful and military purposes}} ...b|200px|Universal track [[Unimog 404|Unimog S 404]] used both in civil and military services]] ...

[[File:ResistorColorCodeGuide.jpg|thumb|[[Radio Manufacturers Association|RMA]] resistor color code guide, ca. 1945–1950]] ...fixed resistor coloring code marking. In 1930, the first [[Radio receiver|radio]]s with RMA color-coded resistors were built.<ref name="ARH_1932_1"/><ref n ...

...dern examples include a variety of [[radio beacon]]s that can be read on [[radio direction finder]]s in all weather, and [[Transponder|radar transponder]]s ...estinations. Types of navigational beacons include [[radar]] reflectors, [[radio beacons]], sonic and visual signals. Visual beacons range from small, singl ...

...anges in undersea water pressure, and are a component of [[tsunami warning systems]] in the [[Pacific Tsunami Warning Center]] and Indian Oceans. ...sure, and wind speed and direction. They transmit this data, via satellite radio links such as the purpose-built [[Argos System]] or commercial [[satellite ...

...-ordinated manner.<ref>Metcalfe M. A Pragmatic System of Decision Criteria Systems Research and Behavioral Science 2012 {{doi|10.1002/sres.2122}}</ref><ref>{{ ...h is flat or round.<ref>Baggini, J. 2005. Pragmatism History Of Ideas. BBC Radio 4, London.</ref> ...

The [[United States Army]] uses various personnel management systems to classify soldiers in different specialties which they receive specialize ...hort alphanumerical code called a [[United States military occupation code|military occupational core specialty code]] (MOSC), which consists of a two-digit nu ...

...r work with the Navy during the World Wars and branching into other marine systems. ...ls used in air that optimized them for underwater use. Electrical striking systems allowed the bells to be connected to surface aids. Canadian experiments sho ...