|
NAA (Arlington, Virginia)
NAA was a major radio facility located at 701 Courthouse Road in Arlington, Virginia. It was operated by the U.S. Navy from 1913 until 1941. The station was originally constructed as the Navy's first high-powered transmitter for communicating with its bases across the U.S. and the Caribbean. During its years of operation NAA was best known for broadcasting daily time signals, however, it also provided a variety of additional services, using multiple transmitters operating on frequencies ranging from longwave to shortwave. The station also conducted extensive experimental work, including, in 1915, the Navy's first transatlantic transmission of speech. History The establishment of NAA was the first step of an ambitious U.S. military project to establish reliable long distance radio communication. (At this time radio was commonly known as "wireless telegraphy".) The site chosen for the NAA installation, which became known as "Radio, Virginia", was across the Potomac River from Wash ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amateur Radio
Amateur radio, also known as ham radio, is the use of the radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communications. The term "amateur" is used to specify "a duly authorised person interested in radioelectric practice with a purely personal aim and without pecuniary interest;" (either direct monetary or other similar reward) and to differentiate it from commercial broadcasting, public safety (such as police and fire), or professional two-way radio services (such as maritime, aviation, taxis, etc.). The amateur radio service (''amateur service'' and '' amateur-satellite service'') is established by the International Telecommunication Union (ITU) through the Radio Regulations. National governments regulate technical and operational characteristics of transmissions and issue individual station licenses with a unique identifying call sign, which mus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Stations In Virginia
The following is a list of FCC-licensed radio stations in the U.S. state of Virginia which can be sorted by their call signs, frequencies, cities of license, licensees, and programming formats. List of radio stations Defunct * WBBL * WBDY * WBVA * WCLM-LP * WDIC * WDUF * WJRX-LP * WJYI * WLEE * WMVA * WODI * WORJ-LP * WOWZ * WPEX * WPVC-LP * WRAP * WRRW-LP * WSVG * WVAB * WXMY * WXZR-LP See also * Virginia media ** List of newspapers in Virginia ** List of television stations in Virginia ** Media of cities in Virginia: Chesapeake, Hampton, Newport News, Norfolk, Richmond, Roanoke, Virginia Beach References Bibliography * * External links * (Directory ceased in 2017) Virginia Association of BroadcastersMid-Atlantic Antique Radio Club Images File:Arlington radio towers in Virginia Library of Congress thc1995002299.jpg, Radio towers, Arlington, Virginia, 20th c. File:2005 Virginia State Capitol radio press booth in Richmond Library of Congress va1498 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Former Radio Masts And Towers
A former is an object, such as a template, gauge or cutting die, which is used to form something such as a boat's hull. Typically, a former gives shape to a structure that may have complex curvature. A former may become an integral part of the finished structure, as in an aircraft fuselage, or it may be removable, being using in the construction process and then discarded or re-used. Aircraft formers Formers are used in the construction of aircraft fuselage, of which a typical fuselage has a series from the nose to the empennage, typically perpendicular to the longitudinal axis of the aircraft. The primary purpose of formers is to establish the shape of the fuselage and reduce the column length of stringers to prevent instability. Formers are typically attached to longerons, which support the skin of the aircraft. The "former-and-longeron" technique (also called stations and stringers) was adopted from boat construction, and was typical of light aircraft built until the ad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Military Radio Systems
A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. It is typically authorized and maintained by a sovereign state, with its members identifiable by their distinct military uniform. It may consist of one or more military branches such as an army, navy, air force, space force, marines, or coast guard. The main task of the military is usually defined as defence of the state and its interests against external armed threats. In broad usage, the terms ''armed forces'' and ''military'' are often treated as synonymous, although in technical usage a distinction is sometimes made in which a country's armed forces may include both its military and other paramilitary forces. There are various forms of irregular military forces, not belonging to a recognized state; though they share many attributes with regular military forces, they are less often referred to as simply ''military''. A nation's military may f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lattice Towers
Lattice may refer to: Arts and design * Latticework, an ornamental criss-crossed framework, an arrangement of crossing laths or other thin strips of material * Lattice (music), an organized grid model of pitch ratios * Lattice (pastry), an ornamental pattern of crossing strips of pastry Companies * Lattice Engines, a technology company specializing in business applications for marketing and sales * Lattice Group, a former British gas transmission business * Lattice Semiconductor, a US-based integrated circuit manufacturer Science, technology, and mathematics Mathematics * Lattice (group), a repeating arrangement of points ** Lattice (discrete subgroup), a discrete subgroup of a topological group whose quotient carries an invariant finite Borel measure ** Lattice (module), a module over a ring which is embedded in a vector space over a field ** Lattice graph, a graph that can be drawn within a repeating arrangement of points ** Lattice-based cryptography, encryption systems bas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Institute Of Standards And Technology
The National Institute of Standards and Technology (NIST) is an agency of the United States Department of Commerce whose mission is to promote American innovation and industrial competitiveness. NIST's activities are organized into physical science laboratory programs that include nanoscale science and technology, engineering, information technology, neutron research, material measurement, and physical measurement. From 1901 to 1988, the agency was named the National Bureau of Standards. History Background The Articles of Confederation, ratified by the colonies in 1781, provided: The United States in Congress assembled shall also have the sole and exclusive right and power of regulating the alloy and value of coin struck by their own authority, or by that of the respective states—fixing the standards of weights and measures throughout the United States. Article 1, section 8, of the Constitution of the United States, ratified in 1789, granted these powers to the new Congr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WWV (radio Station)
WWV is a shortwave ("high frequency" or HF) radio station, located near Fort Collins, Colorado. It has broadcast a continuous time signal since 1945, and implements United States government frequency standards, with transmitters operating on 2.5, 5, 10, 15, and 20 MHz. WWV is operated by the U.S. National Institute of Standards and Technology (NIST), under the oversight of its Time and Frequency Division, which is part of NIST's Physical Measurement Laboratory based in Gaithersburg, Maryland. WWV was established in 1919 by the Bureau of Standards in Washington, D.C., making it one of the oldest continuously-operating radio stations in the United States. NIST celebrated WWV's centennial on October 1, 2019. In 1931, the station relocated to the first of three suburban Maryland sites, before moving to a location near Fort Collins in 1966. WWV shares this site with longwave (also known as "low frequency" or LF) station WWVB, which transmits carrier and time code (no voice) at 60 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ronald Reagan Washington National Airport
Ronald Reagan Washington National Airport , sometimes referred to colloquially as National Airport, Washington National, Reagan National Airport, DCA, Reagan, or simply National, is an international airport in Arlington County, Virginia, across the Potomac River from Washington, D.C. It is the smaller of two airports operated by the Metropolitan Washington Airports Authority (MWAA) that serve the National Capital Region (NCR) around Washington, D.C. (the larger being Dulles International Airport about to the west in Virginia's Fairfax and Loudoun counties). The airport is from downtown Washington, D.C., and the city is visible from the airport. The airport's original name was Washington National Airport. In 1998, Congress renamed it Ronald Reagan National Airport in honor of President Ronald Reagan. MWAA operates the airport with close oversight by the federal government due to its proximity to the national capital. Flights into and out of the airport are generally not allow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NSS Annapolis
NSS Annapolis, officially known as Naval Communications Station Washington, D.C. Transmitter or NavCommStaWashingtonDC(T), was a Very Low Frequency (VLF) and High Frequency (HF) transmitter station operated by the United States Navy. It was located at Greenbury Point, in Anne Arundel County, across the Severn River from Annapolis, Maryland at coordinates . NSS Annapolis was used by the USN for submarine communication. The station consisted of aumbrella antennasupported by a 1,200-foot (365.76 m) high central mast, which was insulated against ground, 6 guyed masts of 800-foot (243.84 m) all of which were built in 1969 and three 600-foot freestanding towers built earlier. Originally the station consisted of nine 600-foot-tall self-supporting lattice towers, the tallest of their kind built in the United States to that date. The first four of which were built in 1918, followed by two more in 1922 and the final three in 1938. As of 2020, only the three built in 1938 remaining st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NAA Arlington, Virginia Antenna Structure (1923)
NAA or Naa may refer to: People * Naa Ashorkor (born 1988), Ghanaian actress and radio/ TV broadcaster * Naa Govindasamy (1946–1999), Singaporean Tamil-language writer and computer font developer * Naa Someswara, Indian science writer and TV presenter Businesses and organizations Airports and aviation * Narita International Airport Corporation, Japan * Narrabri Airport (IATA code NAA), New South Wales, Australia * National Aeronautic Association, US * National Aviation Academy, training school in the US * National aviation authority or civil aviation authority, in each country * North American Airlines, founded 1989, ceased operations 2014 * North American Aviation, major US aerospace manufacturer from 1928 to 1967 * Norwegian Air Argentina, an Argentinian airline In other fields * National Academy of Arbitrators, US and Canada * National Academy of Arts, Bulgaria * National Anthropological Archives of the Smithsonian Institution, US * National Archives of Australia * Natio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lincoln Memorial
The Lincoln Memorial is a U.S. national memorial built to honor the 16th president of the United States, Abraham Lincoln. It is on the western end of the National Mall in Washington, D.C., across from the Washington Monument, and is in the form of a neoclassical temple. The memorial's architect was Henry Bacon. The designer of the memorial interior's large central statue, ''Abraham Lincoln'' (1920), was Daniel Chester French; the Lincoln statue was carved by the Piccirilli brothers. The painter of the interior murals was Jules Guerin, and the epitaph above the statue was written by Royal Cortissoz. Dedicated in May 1922, it is one of several memorials built to honor an American president. It has always been a major tourist attraction and since the 1930s has sometimes been a symbolic center focused on race relations. The building is in the form of a Greek Doric temple and contains a large seated sculpture of Abraham Lincoln and inscriptions of two well-known speeches by L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> WWV (radio Station)")
