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Stratovision
Stratovision was an airborne television transmission relay system using aircraft flying at high altitudes. In 1945 the Glenn L. Martin Company and Westinghouse Electric Corporation originally proposed television coverage of small towns and rural areas, as well as the large metropolitan centers, by fourteen aircraft that would provide coverage for approximately 78% of the people in the United States. Although this was never implemented, the system has been used for domestic broadcasting in the United States, and by the U.S. military in South Vietnam and other countries. Technology Because the broadcasting antenna for Stratovision is usually hung beneath the aircraft in flight, it naturally has a great command of line-of-sight propagation. Although transmission distances are dependent upon atmospheric conditions, a transmitting antenna above the Earth's surface has a line of sight distance of approximately . A Stratovision 25 kW transmitter operating from at 600 MHz w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratovision
Stratovision was an airborne television transmission relay system using aircraft flying at high altitudes. In 1945 the Glenn L. Martin Company and Westinghouse Electric Corporation originally proposed television coverage of small towns and rural areas, as well as the large metropolitan centers, by fourteen aircraft that would provide coverage for approximately 78% of the people in the United States. Although this was never implemented, the system has been used for domestic broadcasting in the United States, and by the U.S. military in South Vietnam and other countries. Technology Because the broadcasting antenna for Stratovision is usually hung beneath the aircraft in flight, it naturally has a great command of line-of-sight propagation. Although transmission distances are dependent upon atmospheric conditions, a transmitting antenna above the Earth's surface has a line of sight distance of approximately . A Stratovision 25 kW transmitter operating from at 600 MHz w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
B-29 Superfortress
The Boeing B-29 Superfortress is an American four-engined propeller-driven heavy bomber, designed by Boeing and flown primarily by the United States during World War II and the Korean War. Named in allusion to its predecessor, the B-17 Flying Fortress, the Superfortress was designed for high-altitude strategic bombing, but also excelled in low-altitude night incendiary bombing, and in dropping naval mines to blockade Japan. B-29s dropped the atomic bombs on Hiroshima and Nagasaki, the only aircraft ever to drop nuclear weapons in combat. One of the largest aircraft of World War II, the B-29 was designed with state-of-the-art technology, which included a pressurized cabin, dual-wheeled tricycle landing gear, and an analog computer-controlled fire-control system that allowed one gunner and a fire-control officer to direct four remote machine gun turrets. The $3 billion cost of design and production (equivalent to $ billion today), far exceeding the $1.9 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Midwest Program On Airborne Television Instruction
The Midwest Program on Airborne Television Instruction (MPATI) was a special broadcasting initiative designed to broadcast educational television programming to schools, especially in areas where local educational television stations are either difficult to receive or unavailable. From 1961 through 1968, MPATI's programming broadcast from two DC-6AB aircraft based at the Purdue University Airport in West Lafayette, Indiana, using a broadcasting technique known as Stratovision. History The undertaking began as a three-year experiment in 1960, with MPATI organizing, producing, and broadcasting instructional television with seed money from the Ford Foundation. This was a nonprofit organization of educators and television producers that pioneered instructional television for enriching education in public schools throughout the midwest. This was prior to the advent of satellite television transmission. By 1963, MPATI moved into its second phase where it relied entirely on membership ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Vietnam
South Vietnam, officially the Republic of Vietnam ( vi, Việt Nam Cộng hòa), was a state in Southeast Asia that existed from 1955 to 1975, the period when the southern portion of Vietnam was a member of the Western Bloc during part of the Cold War after the 1954 division of Vietnam. It first received international recognition in 1949 as the State of Vietnam within the French Union, with its capital at Saigon (renamed to Ho Chi Minh City in 1976), before becoming a republic in 1955. South Vietnam was bordered by North Vietnam to the north, Laos to the northwest, Cambodia to the southwest, and Thailand across the Gulf of Thailand to the southwest. Its sovereignty was recognized by the United States and 87 other nations, though it failed to gain admission into the United Nations as a result of a Soviet veto in 1957. It was succeeded by the Republic of South Vietnam in 1975. The end of the Second World War saw anti-Japanese Việt Minh guerrilla forces, led by communist fig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glenn L
{{disambiguation, geo ...
Glenn may refer to: Name or surname * Glenn (name) * John Glenn, U.S. astronaut Cultivars * Glenn (mango) * a 6-row barley variety Places In the United States: * Glenn, California * Glenn County, California * Glenn, Georgia, a settlement in Heard County * Glenn, Illinois * Glenn, Michigan * Glenn, Missouri * University, Orange County, North Carolina, formerly called Glenn * Glenn Highway in Alaska Organizations * Glenn Research Center, a NASA center in Cleveland, Ohio See also * New Glenn, a heavy-lift orbital launch vehicle * * * Glen, a valley *Glen (other) A glen is a valley, typically one that is long, deep, and often glacially U-shaped, usually in Scotland. Glen may also refer to: People *Glen (given name) *Glen (surname) Places *River Glen (other); covering "Glen (river)", "River Glen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Republican National Convention
The Republican National Convention (RNC) is a series of presidential nominating conventions held every four years since 1856 by the United States Republican Party. They are administered by the Republican National Committee. The goal of the Republican National Convention is to officially nominate and confirm a candidate for president and vice president, adopt a comprehensive party platform and unify the party, as well as publicize and launch the fall campaign. Delegates from all fifty U.S. states and from American dependencies and territories such as Puerto Rico and the Virgin Islands attend the convention and cast their votes. Like the Democratic National Convention, the Republican National Convention marks the formal end of the primary election period and the start of the general election season. In 2020 all parties replaced the usual conventions with short online programs. Delegations The party's presidential nominee is chosen primarily by pledged delegates, which are in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Broadcasting & Cable
''Broadcasting & Cable'' (or ''Broadcasting+Cable'') is a weekly telecommunications industry trade magazine published by Future US. Previous names included ''Broadcasting-Telecasting'', ''Broadcasting and Broadcast Advertising'', and ''Broadcasting''. ''B&C'', which was published biweekly until January 1941, and weekly thereafter, covers the business of television in the U.S.—programming, advertising, regulation, technology, finance, and news. In addition to the newsweekly, ''B&C'' operates a comprehensive website that provides a roadmap for readers in an industry that is in constant flux due to shifts in technology, culture and legislation, and offers a forum for industry debate and criticism. History ''Broadcasting'' was founded in Washington, D.C., by Martin Codel, Sol Taishoff, and former National Association of Broadcasters president Harry Shaw, and the first issue was published on October 15, 1931. Originally, Shaw was publisher, Codel editor, and Taishoff managi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saigon
, population_density_km2 = 4,292 , population_density_metro_km2 = 697.2 , population_demonym = Saigonese , blank_name = GRP (Nominal) , blank_info = 2019 , blank1_name = – Total , blank1_info = US$61.7 billion , blank2_name = – Per capita , blank2_info = US$6,862 , blank3_name = GRP ( PPP) , blank3_info = 2019 , blank4_name = – Total , blank4_info = US$190.3 billion , blank5_name = – Per capita , blank5_info = US$21,163 , blank6_name = HDI (2020) , blank6_info = 0.795 ( 2nd) , area_code = 28 , area_code_type = Area codes , website = , timezone = ICT , utc_offset = +07:00 , postal_code_type = Postal code , postal_code = 700000–740000 , iso_code ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Navy
The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage of its active battle fleet alone exceeding the next 13 navies combined, including 11 allies or partner nations of the United States as of 2015. It has the highest combined battle fleet tonnage (4,635,628 tonnes as of 2019) and the world's largest aircraft carrier fleet, with eleven in service, two new carriers under construction, and five other carriers planned. With 336,978 personnel on active duty and 101,583 in the Ready Reserve, the United States Navy is the third largest of the United States military service branches in terms of personnel. It has 290 deployable combat vessels and more than 2,623 operational aircraft . The United States Navy traces its origins to the Continental Navy, which was established during the American Revo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indian Head Test Card
The Indian-head test pattern is a test card created by RCA of Harrison, New Jersey, which became the standard image of the RCA TK-1 monoscope. It features a drawing of a Native American wearing a headdress and numerous graphic elements designed to test different aspects of broadcast display. The card was introduced in 1939 and over the course of the black-and-white television broadcasting era was widely adopted by television stations across North America. As television broadcasting ritual The Indian-head test pattern became familiar to the large baby boom TV audiences in America from 1947 onwards; it would often follow the formal television station sign-off after the United States national anthem. The Indian head was also used by the Canadian Broadcasting Corporation (CBC) in Canada in conjunction with its own monochrome test pattern, following the Canadian national anthem sign-off in the evening, and during its final years in the late-1970s and early-1980s it was shown ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Douglas DC-6
The Douglas DC-6 is a piston-powered airliner and cargo aircraft built by the Douglas Aircraft Company from 1946 to 1958. Originally intended as a military transport near the end of World War II, it was reworked after the war to compete with the Lockheed Constellation in the long-range commercial transport market. More than 700 were built and many still fly in cargo, military, and wildfire control roles. The DC-6 was known as the C-118 Liftmaster in United States Air Force service and as the R6D in United States Navy service prior to 1962, after which all U.S. Navy variants were also designated as the C-118. Design and development The United States Army Air Forces commissioned the DC-6 project as the XC-112 in 1944. The Army Air Forces wanted a lengthened, pressurized version of the DC-4-based C-54 Skymaster transport with more powerful engines. By the time the prototype XC-112A flew on 15 February 1946, the war was over, the USAAF had rescinded its requirement, and the aircr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ford Foundation
The Ford Foundation is an American private foundation with the stated goal of advancing human welfare. Created in 1936 by Edsel Ford and his father Henry Ford, it was originally funded by a US$25,000 gift from Edsel Ford. By 1947, after the death of the two founders, the foundation owned 90% of the non-voting shares of the Ford Motor Company. (The Ford family retained the voting shares.) Between 1955 and 1974, the foundation sold its Ford Motor Company holdings and now plays no role in the automobile company. Ahead of the foundation selling its Ford Motor Company holdings, in 1949, Henry Ford II created the , a separate corporate foundation that to this day serves as the philanthropic arm of the Ford Motor Company and is not associated with the foundation. The Ford Foundation makes grants through its headquarters and ten international field offices. For many years, the foundation's financial endowment was the largest private endowment in the world; it remains among the wealthie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
