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Shortwave
Shortwave radio
Shortwave radio
is radio transmission using shortwave radio frequencies. There is no official definition of the band, but the range always includes all of the high frequency band (HF), and generally extends from 1.7–30  MHz
MHz
(176.3–10.0 m); from the high end of the medium frequency band (MF) just above the mediumwave AM broadcast band, to the end of the HF band. Radio
Radio
waves in the shortwave band can be reflected or refracted from a layer of electrically charged atoms in the atmosphere called the ionosphere. Therefore, short waves directed at an angle into the sky can be reflected back to Earth at great distances, beyond the horizon. This is called skywave or "skip" propagation
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Kilohertz
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units
International System of Units
(SI) and is defined as one cycle per second.[1] It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves. Hertz
Hertz
are commonly expressed in multiples: kilohertz (103 Hz, kHz), megahertz (106 Hz, MHz), gigahertz (109 Hz, GHz), and terahertz (1012 Hz, THz). Some of the unit's most common uses are in the description of sine waves and musical tones, particularly those used in radio- and audio-related applications
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General Post Office
The General Post Office
General Post Office
(GPO)[1] was officially established in England in 1660[2] by Charles II and it eventually grew to combine the functions of state postal system and telecommunications carrier. Similar General Post Offices were established across the British Empire. In 1969 the GPO was abolished and the assets transferred to The Post Office, changing it from a Department of State to a statutory corporation. In 1980, the telecommunications and postal sides were split prior to the British Telecommunications' split into a totally separate publicly owned corporation the following year as a result of the British Telecommunications
Telecommunications
Act 1981
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Transmitter
In electronics and telecommunications a transmitter or radio transmitter is an electronic device which produces radio waves with an antenna. The transmitter itself generates a radio frequency alternating current, which is applied to the antenna. When excited by this alternating current, the antenna radiates radio waves. Transmitters are necessary component parts of all electronic devices that communicate by radio, such as radio and television broadcasting stations, cell phones, walkie-talkies, wireless computer networks, Bluetooth
Bluetooth
enabled devices, garage door openers, two-way radios in aircraft, ships, spacecraft, radar sets and navigational beacons. The term transmitter is usually limited to equipment that generates radio waves for communication purposes; or radiolocation, such as radar and navigational transmitters
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Guglielmo Marconi
Guglielmo Marconi, 1st Marquis of Marconi (/mɑːrˈkoʊni/;[1] Italian: [ɡuʎˈʎɛlmo marˈkoːni]; 25 April 1874 – 20 July 1937) was an Italian[2][3][4][5] inventor and electrical engineer known for his pioneering work on long-distance radio transmission[6] and for his development of Marconi's law and a radio telegraph system. He is credited as the inventor of radio,[7] and he shared the 1909 Nobel Prize in Physics
Nobel Prize in Physics
with Karl Ferdinand Braun
Karl Ferdinand Braun
"in recognition of their contributions to the development of wireless telegraphy".[8][9][10] Marconi was also an entrepreneur, businessman, and founder of The Wireless Telegraph & Signal Company in the United Kingdom in 1897 (which became the Marconi Company)
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Grundig
Grundig
Grundig
(German pronunciation: [ˈɡʁʊndɪç], English: /ˈɡrʌndɪɡ/ or /ˈɡrʊndɪɡ/) is a German manufacturer of consumer electronics, domestic appliances and personal care products. Established in 1945 by Max Grundig
Max Grundig
in Nuremberg. Since 2007, the Grundig
Grundig
brand has become part of Turkey's Arçelik
Arçelik
A.S., the third largest company in the white goods industry in Europe and part of the Stock Exchange-listed Koç Holding, a global conglomerate with more than 80,000 employees
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Austria
Coordinates: 47°20′N 13°20′E / 47.333°N 13.333°E / 47.333; 13.333 Republic
Republic
of Austria Republik Österreich  (German)FlagCoat of armsAnthem: Land der Berge, Land am Strome  (German) Land of Mountains, Land by the RiverLocation of  Austria  (dark green) – in Europe  (green & dark grey) – in the European Union  (green)  –  [Legend]Capital and largest city Vienna 48°12′N 16°21′E / 48.200°N 16.350°E / 48.200; 16.350Official languages German[a][b]
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Germany
Coordinates: 51°N 9°E / 51°N 9°E / 51; 9Federal Republic
Republic
of Germany Bundesrepublik Deutschland (German)[a]FlagCoat of armsMotto:  "Einigkeit und Recht und Freiheit" (de facto) "Unity and Justice and Freedom"Anthem: "Deutschlandlied" (third verse only)[b] "Song of Germany"Location of  Germany  (dark green) – in Europe  (green & dark grey) – in the European Union  (green)Location of
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ITU Region 2
The International Telecommunication Union (ITU), in its International Radio Regulations, divides the world into three ITU regions for the purposes of managing the global radio spectrum
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Cornwall
Cornwall (/ˈkɔːrnwɔːl, -wəl/;[1] Cornish: Kernow [ˈkɛrnɔʊ]) is a county in South West England in the United Kingdom. The county is bordered to the north and west by the Celtic Sea,[2] to the south by the English Channel, and to the east by the county of Devon, over the River Tamar which forms most of the border between them. Cornwall forms the westernmost part of the South West Peninsula of the island of Great Britain. The furthest southwestern point of the island is Land's End; the southernmost point is Lizard Point. Cornwall has a population of 556,000 and covers an area of 3,563 km2 (1,376 sq mi).[3][4][5][6] The county has been administered since 2009 by the unitary authority, Cornwall Council. The ceremonial county of Cornwall also includes the Isles of Scilly, which are administered separately
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MHz
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units
International System of Units
(SI) and is defined as one cycle per second.[1] It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves. Hertz
Hertz
are commonly expressed in multiples: kilohertz (103 Hz, kHz), megahertz (106 Hz, MHz), gigahertz (109 Hz, GHz), and terahertz (1012 Hz, THz). Some of the unit's most common uses are in the description of sine waves and musical tones, particularly those used in radio- and audio-related applications
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ITU Region 1
The International Telecommunication Union (ITU), in its International Radio Regulations, divides the world into three ITU regions for the purposes of managing the global radio spectrum
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Radio Telegraphy
Wireless
Wireless
telegraphy is the transmission of electric telegraphy signals without wires (wirelessly). The term is used synonymously for radio communication systems, also called radiotelegraphy, which transmit telegraph signals by radio waves
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Cape Verde
Cape Verde
Cape Verde
(/ˌkeɪp ˈvɜːrd/) or Cabo Verde (/ˌkɑːboʊ ˈvɜːrdeɪ/, /ˌkæb-/) (Portuguese: Cabo Verde, pronounced [ˈkaβu ˈveɾðɨ]), officially the Republic
Republic
of Cabo Verde,[9] is an island country spanning an archipelago of 10 volcanic islands in the central Atlantic Ocean. It forms part of the Macaronesia
Macaronesia
Ecoregion, along with the Azores, Canary Islands, Madeira, and the Savage Isles. In ancient time these islands were referred to as "the Islands of the Blessed" or the "Fortunate Isles"
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New Zealand
New Zealand
New Zealand
(/njuːˈziːlənd/ ( listen); Māori: Aotearoa [aɔˈtɛaɾɔa]) is an island country in the southwestern Pacific Ocean. The country geographically comprises two main landmasses—the North Island
North Island
(Te Ika-a-Māui), and the South Island
South Island
(Te Waipounamu)—and around 600 smaller islands. New Zealand
New Zealand
is situated some 1,500 kilometres (900 mi) east of Australia
Australia
across the Tasman Sea
Tasman Sea
and roughly 1,000 kilometres (600 mi) south of the Pacific island areas of New Caledonia, Fiji, and Tonga. Because of its remoteness, it was one of the last lands to be settled by humans. During its long period of isolation, New Zealand
New Zealand
developed a distinct biodiversity of animal, fungal and plant life
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Vacuum Tube
In electronics, a vacuum tube, an electron tube,[1][2][3] or just a tube (North America), or valve (Britain and some other regions) is a device that controls electric current between electrodes in an evacuated container. Vacuum
Vacuum
tubes mostly rely on thermionic emission of electrons from a hot filament or a heated cathode. This type is called a thermionic tube or thermionic valve. A phototube, however, achieves electron emission through the photoelectric effect. Not all electronic circuit valves/electron tubes are vacuum tubes (evacuated); gas-filled tubes are similar devices containing a gas, typically at low pressure, which exploit phenomena related to electric discharge in gases, usually without a heater. The simplest vacuum tube, the diode, contains only a heater, a heated electron-emitting cathode (the filament itself acts as the cathode in some diodes), and a plate (anode)
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