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SCR-300
The SCR-300, designated AN/VRC-3 under the Joint Electronics Type Designation System, was a portable frequency modulated (FM) radio transceiver used by US Signal Corps in World War II. This backpack-mounted unit was the first radio to be nicknamed a " walkie talkie". History In 1940, Motorola (then the Galvin Manufacturing Company) received a contract from the War Department to develop a portable, battery powered voice radio receiver/transmitter for field use by infantry units. The project engineering team consisted of Daniel E. Noble, who conceived of the design using frequency modulation, Henryk Magnuski who was the principal RF engineer, Marion Bond, Lloyd Morris, and Bill Vogel. The SCR-300 operated in the 40.0 to 48.0 MHz (megahertz) frequency range, and was channelized. Along with other mobile FM tank and artillery radios such as the SCR-508 (20.0 to 27.9 MHz) and the SCR-608 (27.0 to 38.9 MHz), the SCR-300 marked the beginning of the transition of combat-net ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Henryk Magnuski
Henryk Władysław Magnuski (January 30, 1909 – May 4, 1978) was a Polish telecommunications engineer who worked for Motorola in Chicago. He was a primary contributor in the development of one of the first Walkie-Talkie radios, the Motorola SCR-300, and influenced the company's success in the field of radio communication. Early years Magnuski was born on January 30, 1909, in Warsaw. Having lost both parents at a relatively early age, he supported himself and his sister, Janina, by fixing and installing radios for the Polish military. He received his degree from Warsaw University of Technology in 1934 and started working for the ''State Tele- and Radiotechnical Works'' (''Państwowe Zakłady Tele i Radiotechniczne'') in Warsaw. In June 1939 he was sent by his company to New York, New York, New York in order to study the latest American projects of radio transmitters. Soon after his arrival to the United States, Poland was invaded by Germany and World War II broke out. His return ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
US Signal Corps
The United States Army Signal Corps (USASC) is a branch of the United States Army responsible for creating and managing communications and information systems for the command and control of combined arms forces. It was established in 1860 by Major Albert J. Myer and played a significant role during the American Civil War. It has the initial responsibility for portfolios and new technologies that are eventually transferred to other U.S. government entities. Such responsibilities included military intelligence, weather forecasting, and aviation. Mission statement Support for the command and control of combined arms forces. Signal support includes network operations (information assurance, information dissemination management, and network management) and management of the electromagnetic spectrum. Signal support encompasses all aspects of designing, installing, data communications networks that employ single and multi-channel satellite, tropospheric scatter, terrestrial microwav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Megahertz
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), often described as being equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose formal expression in terms of SI base units is 1/s or s−1, meaning that one hertz is one per second or the reciprocal of one second. It is used only in the case of periodic events. It is named after Heinrich Rudolf Hertz (1857–1894), the first person to provide conclusive proof of the existence of electromagnetic waves. For high frequencies, the unit is commonly expressed in multiples: kilohertz (kHz), megahertz (MHz), gigahertz (GHz), terahertz (THz). Some of the unit's most common uses are in the description of periodic waveforms and musical tones, particularly those used in radio- and audio-related applications. It is also used to describe the clock speeds at which computers and other electronics are driven. The units are sometimes also used as a representation o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Normandy Invasion
Operation Overlord was the codename for the Battle of Normandy, the Allied operation that launched the successful liberation of German-occupied Western Europe during World War II. The operation was launched on 6 June 1944 ( D-Day) with the Normandy landings (Operation Neptune). A 1,200-plane airborne assault preceded an amphibious assault involving more than 5,000 vessels. Nearly 160,000 troops crossed the English Channel on 6 June, and more than two million Allied troops were in France by the end of August. The decision to undertake cross-channel landings in 1944 was made at the Trident Conference in Washington in May 1943. American General Dwight D. Eisenhower was appointed commander of Supreme Headquarters Allied Expeditionary Force, and British General Bernard Montgomery was named commander of the 21st Army Group, which comprised all the land forces involved in the operation. The Normandy coast in northwestern France was chosen as the site of the landings, with the A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
New Georgia
New Georgia, with an area of , is the largest of the islands in Western Province (Solomon Islands), Western Province, Solomon Islands, and the List of islands by area, 203rd-largest island in the world. Since July 1978, the island has been part of the independent state of Solomon Islands. Geography New Georgia island is located in the New Georgia Group, an archipelago including most of the other larger islands in the province. The island measures approximately long by wide. New Georgia forms part of the southern boundary of the New Georgia Sound. Kolombangara lies across the Kula Gulf to the west, Choiseul Island, Choiseul to the northeast, Vangunu is to the southeast, and Rendova to the southwest, across the Blanche Channel. New Georgia is a volcanic island, surrounded in some places by a coral reef. The highest point is Mount Masse, with an elevation of . The climate is wet and tropical, and the island is subject to frequent cyclones. New Georgia is covered with dense ve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Pacific Theater (World War II)
The Pacific War, sometimes called the Asia–Pacific War or the Pacific Theatre, was the theatre of World War II fought between the Empire of Japan and the Allies in East and Southeast Asia, the Pacific and Indian Oceans, and Oceania. It was geographically the largest theatre of the war, including the Pacific Ocean theatre, the South West Pacific theatre, the Second Sino-Japanese War, and the brief Soviet–Japanese War, and included some of the largest naval battles in history. War between Japan and the Republic of China had begun in 1937, with hostilities dating back to Japan's invasion of Manchuria in 1931, but the Pacific War is more widely accepted to have started in 1941, when the United States and United Kingdom entered the war against Japan. Japan invaded French Indochina in 1940, and extended its control over the entire territory in July 1941. On 7–8 December 1941, Japan attacked the American naval base at Pearl Harbor in Hawaii; the U.S.-held Philippines, G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Kentucky
Kentucky (, ), officially the Commonwealth of Kentucky, is a landlocked U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders Illinois, Indiana, and Ohio to the north, West Virginia to the northeast, Virginia to the east, Tennessee to the south, and Missouri to the west. Its northern border is defined by the Ohio River. Its capital is Frankfort, Kentucky, Frankfort and its List of cities in Kentucky, most populous city is Louisville, Kentucky, Louisville. As of 2024, the state's population was approximately 4.6 million. Previously part of Colony of Virginia, colonial Virginia, Kentucky was admitted into the Union as the fifteenth state on June 1, 1792. It is known as the "Bluegrass State" in reference to Kentucky bluegrass, a species of grass introduced by European settlers which has long supported the state's thoroughbred horse industry. The fertile soil in the central and western parts of the state led to the development ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Fort Knox
Fort Knox is a United States Army installation in Kentucky, south of Louisville and north of Elizabethtown, Kentucky, Elizabethtown. It is adjacent to the United States Bullion Depository (also known as Fort Knox), which is used to house a large portion of the United States' official gold reserves, and with which it is often conflated. The base covers parts of Bullitt County, Kentucky, Bullitt, Hardin County, Kentucky, Hardin and Meade County, Kentucky, Meade counties. It currently holds the Army Human Resources Center of Excellence, including the Army Human Resources Command. It is named in honor of Henry Knox, Chief of Artillery in the American Revolutionary War and the first United States Secretary of War. For 60 years, Fort Knox was the home of the U.S. Army Armor Center and School, and was used by both the Army and the United States Marine Corps, Marine Corps to train crews on the American tanks of the day; the last was the M1 Abrams main battle tank. The history of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
