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Leo C. Young
Leo C. Young (12 January 1891 – 16 January 1981) was an American radio engineer who had many accomplishments during a long career at the U.S. Naval Research Laboratory. Although self-educated, he was a member of a small, creative team which some attributed to the developing the world's first true radar system. Background and career Leo Crawford Young grew up on a farm near Van Wert, Ohio. Although his formal education stopped with high-school, he was self-educated in early radio technology. He built his first crystal radio when he was 14 years old. To receive stations, he learned the Morse code, and soon built his own spark-gap transmitter, joining the ranks of amateur radio enthusiasts in the pre-license days. (Young was later issued the call sign W3WV). After high school, he used his ability with Morse code to gain employment as a railroad telegrapher. In 1913, he joined the Naval Communications Reserves and set up the central control station for the Navy-Amateur Network. The N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Van Wert, Ohio
Van Wert is a city in Van Wert County, Ohio, United States, and its county seat. It is located in northwestern Ohio approximately southwest of Toledo, Ohio, Toledo and southeast of Fort Wayne, Indiana. The population was 11,092 at the 2020 United States census, 2020 census. It is the principal city of the Micropolitan statistical area, Van Wert micropolitan area, which is included in the Lima-Van Wert-Wapakoneta, OH Combined Statistical Area, Lima–Van Wert–Wapakoneta combined statistical area. Van Wert is List of Ohio county name etymologies, named for Isaac Van Wart, one of the captors of Major John André in the American Revolutionary War. A center of peony cultivation, Van Wert has hosted the annual Van Wert Peony Festival on and off since 1902. Van Wert is home to the first county library in the United States, the Brumback Library. History Van Wert was surveyed in 1824 by Captain James Riley (captain), James Riley, who was contracted by the government to survey lands p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NAA (Arlington, Virginia)
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oscilloscope
An oscilloscope (formerly known as an oscillograph, informally scope or O-scope) is a type of electronic test instrument that graphically displays varying voltages of one or more signals as a function of time. Their main purpose is capturing information on electrical signals for debugging, analysis, or characterization. The displayed waveform can then be analyzed for properties such as amplitude, frequency, rise time, time interval, distortion, and others. Originally, calculation of these values required manually measuring the waveform against the scales built into the screen of the instrument. Modern digital instruments may calculate and display these properties directly. Oscilloscopes are used in the sciences, engineering, biomedical, automotive and the telecommunications industry. General-purpose instruments are used for maintenance of electronic equipment and laboratory work. Special-purpose oscilloscopes may be used to analyze an automotive ignition system or to display th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert Morris Page
Robert Morris Page (2 June 1903 – 15 May 1992) was an American physicist who was a leading figure in the development of radar technology. Later, Page served as the director of research for the U.S. Naval Research Laboratory. Life and career Page was born in Saint Paul, Minnesota, the son of a Methodist minister. He attended Hamline University, a small Methodist-supported school in St. Paul. Originally intending to become a minister, he changed his studies to physics and in 1927 received his B.S. degree in this field. Page immediately joined the U.S. Naval Research Laboratory (NRL) in Washington, D.C. as a junior physicist. Somewhat later he started part-time studies at George Washington University, eventually earning a M.S. degree. Although Page had no formal education in electrical engineering, building radios had been his hobby since childhood. Assigned to the NRL Radio Division, he quickly gained the confidence of the Division Superintendent, A. Hoyt Taylor, by providing v ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Signal Corps Laboratories
The Signal Corps Laboratories (SCL) was a research installation under the command of the U.S. Army Signal Corps. Headquartered at Fort Monmouth, New Jersey, SCL directed research on electronics, radar, and communication systems for the U.S. Army. Throughout its history, SCL operated under many names as the organizational structure of the Signal Corps and the U.S. Army changed over time. History Post-World War I The Signal Corps Laboratories emerged as a result of declining economic conditions that compelled the U.S. Army Signal Corps to consolidate its widespread laboratories. By the late 1920s, the Signal Corps administered seven different major laboratories across the United States. In Washington, D.C., it had the Signal Corps Electrical Laboratory, the Signal Corps Meteorological Laboratory, the Signal Corps Research Laboratory at the National Bureau of Standards, and the Photographic Laboratory at Fort Humphreys (now Fort Lesley J. McNair). In addition, the Signal Corp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lawrence A
Lawrence may refer to: Education Colleges and universities * Lawrence Technological University, a university in Southfield, Michigan, United States * Lawrence University, a liberal arts university in Appleton, Wisconsin, United States Preparatory & high schools * Lawrence Academy at Groton, a preparatory school in Groton, Massachusetts, United States * Lawrence College, Ghora Gali, a high school in Pakistan * Lawrence School, Lovedale, a high school in India * The Lawrence School, Sanawar, a high school in India Research laboratories * Lawrence Berkeley National Laboratory, United States * Lawrence Livermore National Laboratory, United States People * Lawrence (given name), including a list of people with the name * Lawrence (surname), including a list of people with the name * Lawrence (band), an American soul-pop group * Lawrence (judge royal) (died after 1180), Hungarian nobleman, Judge royal 1164–1172 * Lawrence (musician), Lawrence Hayward (born 1961), Briti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kennelly–Heaviside Layer
The Heaviside layer, sometimes called the Kennelly–Heaviside layer, named after Arthur E. Kennelly and Oliver Heaviside, is a layer of ionised gas occurring roughly between above the ground — one of several layers in the Earth's ionosphere. It is also known as the E region. It reflects medium-frequency radio waves. Because of this reflective layer, radio waves radiated into the sky can return to Earth beyond the horizon. This "skywave" or "skip" propagation technique has been used since the 1920s for radio communication at long distances, up to transcontinental distances. Propagation is affected by the time of day. During the daytime the solar wind presses this layer closer to the Earth, thereby limiting how far it can reflect radio waves. Conversely, on the night ( lee) side of the Earth, the solar wind drags the ionosphere further away, thereby greatly increasing the range which radio waves can travel by reflection. The extent of the effect is further influenced b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ionosphere
The ionosphere () is the ionized part of the upper atmosphere of Earth, from about to above sea level, a region that includes the thermosphere and parts of the mesosphere and exosphere. The ionosphere is ionized by solar radiation. It plays an important role in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical importance because, among other functions, it influences radio propagation to distant places on Earth. Travel through this layer also impacts GPS signals, resulting in effects such as deflection in their path and delay in the arrival of the signal. History of discovery As early as 1839, the German mathematician and physicist Carl Friedrich Gauss postulated that an electrically conducting region of the atmosphere could account for observed variations of Earth's magnetic field. Sixty years later, Guglielmo Marconi received the first trans-Atlantic radio signal on December 12, 1901, in St. John's, Newfoundland (now in Canada) usin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carnegie Institution Of Washington
The Carnegie Institution for Science, also known as Carnegie Science and the Carnegie Institution of Washington, is an organization established to fund and perform scientific research in the United States. This institution is headquartered in Washington, D.C. , the Institution's endowment was valued at $926.9 million. In 2018, the expenses for scientific programs and administration were $96.6 million. American astrophysicist John Mulchaey is the current president of the institution. Name More than 20 independent organizations were established through the philanthropy of Andrew Carnegie and feature his surname. In 2024, the "Carnegie Institution for Science" officially adopted the name "Carnegie Science", a name which has been used informally since 2007 when they first changed the name from "Carnegie Institution of Washington" to "Carnegie Institution for Science". History It is proposed to found in the city of Washington, an institution which ... shall in the broad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Merle A
Merle may refer to: People and fictional characters *Merle (given name), a list of men, women and fictional characters *Merle (surname), a list of people Others *Merle (dog coat), a pattern in dogs’ coats *Merle (grape), another name for the wine grape Merlot *Akaflieg München Mü17 Merle, a German glider originally built in 1938 for the 1940 Olympics gliding competition * MS ''Phocine'', a ferry formerly named MS ''Merle'' *A Crusader fort near Tantura on the coast of Israel *The French name for the common blackbird See also *Merl (other) Merl or MERL may refer to: Merl * Merl (name), a list of people with the given name or surname * Merl, Luxembourg, a quarter of Luxembourg City * Merl (Buffyverse), a fictional character in the television series ''Angel'' MERL * Mechanical E ... * Merles, a commune in southern France {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gregory Breit
Gregory Breit (, ; July 14, 1899 – September 13, 1981) was an American physicist born in Mykolaiv, Russian Empire (now Mykolaiv, Ukraine). He was a professor at New York University (1929–1934), University of Wisconsin–Madison (1934–1947), Yale University (1947–1968), and University at Buffalo (1968–1973). In 1921, he was Paul Ehrenfest's assistant in Leiden University. Biography He was born in the city of Mykolaiv in the family of the book publisher Alfred Schneider. After the death of his mother in 1911, his father left for the United States of America. Until 1915, Gregory studied at the Mykolaiv Oleksandrivska gymnasium. In 1915, he followed his father to USA. He studied at Johns Hopkins University: in 1918 he obtained a Bachelor degree, in 1920 a Master degree, and in 1921 he earned a PhD in physics. In 1921-1922, he worked as a researcher at Leiden University. In 1922-1923, he was a research fellow at Harvard University. From 1923 to 1924, he was an assistant p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-frequency
High frequency (HF) is the International Telecommunication Union, ITU designation for the radio band, band of radio waves with frequency between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decametre, decameters (ten to one hundred meters). Frequencies immediately below HF are denoted ''medium frequency'' (MF), while the next band of higher frequencies is known as the ''very high frequency'' (VHF) band. The HF band is a major part of the shortwave band of frequencies, so communication at these frequencies is often called ''shortwave radio''. Because radio waves in this band can be reflected back to Earth by the ionosphere layer in the atmosphere – a method known as "skip" or "skywave" propagation – these frequencies can be used for long-distance communication across intercontinental distances and for mountainous terrains which prevent Line-of-sight propagation, line-of-sight communicatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
