|
History Of Broadcasting
It is generally recognized that the first radio transmission was made from a temporary station set up by Guglielmo Marconi in 1895 on the Isle of Wight. This followed on from pioneering work in the field by a number of people including Alessandro Volta, André-Marie Ampère, Georg Ohm and James Clerk Maxwell.''Australian Radio History'', Bruce Carty, Sydney, 2011 The radio broadcasting of music and talk intended to reach a dispersed audience started experimentally around 1905–1906, and commercially around 1920 to 1923. VHF (very high frequency) stations started 30 to 35 years later. In the early days, radio stations broadcast on the longwave, mediumwave and shortwave bands, and later on VHF (very high frequency) and UHF (ultra high frequency). However, in the United Kingdom, Hungary, France and some other places, from as early as 1890 there was already a system whereby news, music, live theatre, music hall, fiction readings, religious broadcasts, etc., were available in priv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guglielmo Marconi
Guglielmo Giovanni Maria Marconi, 1st Marquis of Marconi (; 25 April 187420 July 1937) was an Italians, Italian inventor and electrical engineering, electrical engineer, known for his creation of a practical radio wave-based Wireless telegraphy, wireless telegraph system. This led to Marconi being credited as the inventor of radio, and he shared the 1909 Nobel Prize in Physics with Karl Ferdinand Braun "in recognition of their contributions to the development of wireless telegraphy".Guglielmo Marconi: The Nobel Prize in Physics 1909 . nobelprize.org Marconi was also an entrepreneur, businessman, and founder of Marconi Company, The Wireless Telegraph & Signal Company in the United Kingdom of Great Britain and Ireland, United Kingdom in 1897 (which became the Marconi Com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of The Telephone
This history of the telephone chronicles the development of the electrical telephone, and includes a brief overview of its predecessors. The first telephone patent was granted to Alexander Graham Bell in 1876. Mechanical and acoustic devices Before the invention of electromagnetic telephones, mechanical acoustic devices existed for transmitting speech and music over a greater distance. This distance was greater than that of normal direct speech. The earliest mechanical telephones were based on sound transmission through pipes or other physical media. The acoustic tin can telephone, or "lovers' phone", has been known for centuries. It connects two diaphragms with a taut string or wire, which transmits sound by mechanical vibrations from one to the other along the wire (and not by a modulated electric current). The classic example is the children's toy made by connecting the bottoms of two paper cups, metal cans, or plastic bottles with tautly held string. Some of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sealed Set
In Australia, in 1924 Ernest Fisk (later Sir Ernest) of AWA - Amalgamated Wireless (Australasia) suggested the introduction of a sealed set system (also known as a sealed receiver) where radio sets could only receive the transmitting service (or services) to which they were licensed. Under this model, the Government would issue a licence to transmit on a given wavelength (or frequency in modern terminology) and oversee the manufacture of receivers locked on that wavelength. The owner of the transmitting licence could then charge the receiver's owner a recurrent fee that would be used to run the station. This was seen as preferable to the British situation where the Government backed a monopolistic service (the British Broadcasting Company as it was then) and collected a single licence fee from each household with a receiver. There appears to have been little attention at the time to a third possible model; that of the licensee charging for advertisements, as was done in the United St ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medium Wave
Medium wave (MW) is the part of the medium frequency (MF) radio band used mainly for AM radio broadcasting. The spectrum provides about 120 channels with more limited sound quality than FM stations on the FM broadcast band. During the daytime, reception is usually limited to more local stations, though this is dependent on the signal conditions and quality of radio receiver used. Improved signal propagation at night allows the reception of much longer distance signals (within a range of about 2,000 km or 1,200 miles). This can cause increased interference because on most channels multiple transmitters operate simultaneously worldwide. In addition, amplitude modulation (AM) is often more prone to interference by various electronic devices, especially power supplies and computers. Strong transmitters cover larger areas than on the FM broadcast band but require more energy and longer antennas. Digital modes are possible but have not reached momentum yet. MW was the main radio ban ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amalgamated Wireless (Australasia)
AWA Technology Services, name based on former name Amalgamated Wireless (Australasia) Ltd, is an Australian provider for technology related services. Throughout most of the 20th century AWA was Australia's largest and most prominent electronics organisation, undertaking development, manufacture and distribution of radio, telecommunications, television and audio equipment as well as broadcasting services. After the sell-off of most of its assets and operating divisions, AWA is now primarily an information and communications technology (ICT) services company. History Pre-World War II The company commenced operations in 1909 as Australasian Wireless Limited (AWL), a Telefunken wireless agent. The first chairman was Hugh Denison. Ernest Fisk, a foundation director, was general and technical manager. In 1916 he became managing director and in 1932 chairman. The Marconi Company sued the Australian government in 1912, for infringing their patent (and AWL issued writs against firms ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ernest Fisk
Sir Ernest Thomas Fisk (8 August 18868 July 1965) was an English Australian businessman and entrepreneur who was the founder (1913) and later managing director (1916) and chairman (1932) of Amalgamated Wireless (Australasia) (AWA). In 1944 was appointed managing director of the EMI music empire. On 22 September 1918 he proved the possibility of direct radio communication from the UK to Australia by receiving the first such message at his Sydney home, "Lucania". A memorial was erected on 14 December 1935 to celebrate the achievement. Throughout his career he held many key positions in the electronics industry. In the 1950s he predicted that color televisions would be in world-wide use within 30 years, and solar power would be used to cool and heat houses. Fiskville, Victoria, about 10 kilometres south of Ballan, is named after him. From 1927 to 1969 it was the location of the shortwave wireless transmitting complex operated by AWA as part of the Imperial Wireless Chain. Honours ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devonport, Tasmania
Devonport ( ; Palawa Kani: ''Tiagarra'') is a city in northern Tasmania, Australia, located on the lands of the Pannilerpanner clan of the Palawa nation. It is situated at the mouth of the Mersey River. Devonport had an urban population of 26,150 at the 2021 Australian census. History The first European settlement before 1850 was on a block of land at Frogmore, near present-day Latrobe. In 1850, a settler named Oldaker occupied land at present-day Devonport. Saw milling and coal mining developed with settlers arriving from England in 1854 on board the sailing ship 'Balmoral'. During the 1850s the twin settlements of Formby and Torquay were established on opposite banks at the mouth of the Mersey River. Torquay on the eastern shore was the larger community with police, post, magistrate, at least three hotels, shipyards and stores. A river ferry service connected the two communities. Between 1870 and 1880 the shipping industry grew and work was undertaken to deepen the mouth of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Queenscliff, Victoria
Queenscliff is a small town on the Bellarine Peninsula in southern Victoria, Australia, south of Swan Bay at the entrance to Port Phillip. It is the administrative centre for the Borough of Queenscliffe. At the , Queenscliff had a population of 1,315. Queenscliff is a seaside resort now known for its Victorian era heritage and tourist industry and as one of the endpoints of the Searoad ferry to Sorrento on the Mornington Peninsula. History Prior to European settlement, it was inhabited by the Bengalat Bulag clan of the Wautharong tribe, members of the Kulin nation. European explorers first arrived in 1802, Lieutenant John Murray in January and Captain Matthew Flinders in April. The first European settler in the area was convict escapee William Buckley between 1803 and 1835, who briefly lived in a cave with local Aborigines at Point Lonsdale, above which the lighthouse was later built. Permanent European settlement began in 1836 when squatters arrived. Shortland's Bluff ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marconi Company
The Marconi Company was a British telecommunications and engineering company that did business under that name from 1963 to 1987. Its roots were in the Wireless Telegraph & Signal Company founded by Italian inventor Guglielmo Marconi in 1897, which underwent several changes in name after mergers and acquisitions. The company was a pioneer of wireless long distance communication and mass media broadcasting, eventually becoming one of the UK's most successful manufacturing companies. In 1999, its defence equipment manufacturing division, Marconi Electronic Systems, merged with British Aerospace (BAe) to form BAE Systems. In 2006, financial difficulties led to the collapse of the remaining company, with the bulk of the business acquired by the Swedish telecommunications company, Ericsson. History Naming history *1897–1900: The Wireless Telegraph & Signal Company *1900–1963: Marconi's Wireless Telegraph Company *1963–1987: Marconi Company Ltd *1987–1998: GEC-Marconi Ltd ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morse Code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of the inventors of the telegraph. International Morse code encodes the 26 basic Latin letters through , one accented Latin letter (), the Arabic numerals, and a small set of punctuation and procedural signals ( prosigns). There is no distinction between upper and lower case letters. Each Morse code symbol is formed by a sequence of ''dits'' and ''dahs''. The ''dit'' duration is the basic unit of time measurement in Morse code transmission. The duration of a ''dah'' is three times the duration of a ''dit''. Each ''dit'' or ''dah'' within an encoded character is followed by a period of signal absence, called a ''space'', equal to the ''dit'' duration. The letters of a word are separated by a space of duration equal to three ''dits'', ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amateur Radio Operator
An amateur radio operator is someone who uses equipment at an amateur radio station to engage in two-way personal communications with other amateur operators on radio frequencies assigned to the amateur radio service. Amateur radio operators have been granted an amateur radio license by a governmental regulatory authority after passing an examination on applicable regulations, electronics, radio theory, and radio operation. As a component of their license, amateur radio operators are assigned a call sign that they use to identify themselves during communication. About three million amateur radio operators are currently active worldwide. Amateur radio operators are also known as radio amateurs or hams. The term "ham" as a nickname for amateur radio operators originated in a pejorative usage (like "ham actor") by operators in commercial and professional radio communities, and dates to wired telegraphy. The word was subsequently adopted by amateur radio operators. Demographics {, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Théâtrophone
Théâtrophone ("the theatre phone") was a telephonic distribution system available in portions of Europe that allowed the subscribers to listen to opera and theatre performances over the telephone lines. The théâtrophone evolved from a Clément Ader invention, which was first demonstrated in 1881, in Paris. Subsequently, in 1890, the invention was commercialized by Compagnie du Théâtrophone, which continued to operate until 1932. Origin The origin of the théâtrophone can be traced to a telephonic transmission system demonstrated by Clément Ader at the 1881 International Exposition of Electricity in Paris. The system was inaugurated by the French President Jules Grévy, and allowed broadcasting of concerts or plays. Ader had arranged 80 telephone transmitters across the front of a stage to create a form of binaural stereophonic sound. It was the first two-channel audio system, and consisted of a series of telephone transmitters connected from the stage of the Paris Oper ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> History Of The Telephone")
