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PCGG
PCGG
PCGG
(also known as the Dutch Concerts station) was a radio station located at The Hague
The Hague
in the Netherlands, which began broadcasting a regular schedule of entertainment programmes on 6 November 1919. The station was established by engineer Hans Idzerda, and is believed to have been Europe's first sustained broadcasting station,[2] as well as one of the first stations in the world to transmit entertainment intended for a general audience.[3] PCGG's schedule generally featured one or two evening programmes per week. Although located on the west coast of Holland, the station had a large audience across the English Channel in Great Britain
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Tim Berners-Lee
Sir
Sir
Timothy John Berners-Lee OM KBE FRS FREng FRSA FBCS (born 8 June 1955),[1] also known as TimBL, is an English engineer and computer scientist, best known as the inventor of the World Wide Web. He is currently a professor of Computer Science at the University of Oxford.[3] He made a proposal for an information management system in March 1989,[4] and he implemented the first successful communication between a Hypertext Transfer Protocol
Hypertext Transfer Protocol
(HTTP) client and server via the internet in mid-November the same year.[5][6][7][8][9] Berners-Lee is the director of the World Wide Web Consortium
World Wide Web Consortium
(W3C), which oversees the continued development of the Web
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Telautograph
The telautograph, an analog precursor to the modern fax machine, transmits electrical impulses recorded by potentiometers at the sending station to servomechanisms attached to a pen at the receiving station, thus reproducing at the receiving station a drawing or signature made by the sender. It was the first such device to transmit drawings to a stationary sheet of paper; previous inventions in Europe had used rotating drums to make such transmissions. The telautograph's invention is attributed to Elisha Gray, who patented it on July 31, 1888
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History Of Mobile Phones
The history of mobile phones covers mobile communication devices that connect wirelessly to the public switched telephone network. While the transmission of speech by radio has a long history, the first devices that were wireless, mobile, and also capable of connecting to the standard telephone network are much more recent
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Optical Communication
Optical communication, also known as optical telecommunication, is communication at a distance using light to carry information. It can be performed visually or by using electronic devices. The earliest basic forms of optical communication date back several millennia, while the earliest electrical device created to do so was the photophone, invented in 1880. An optical communication system uses a transmitter, which encodes a message into an optical signal, a channel, which carries the signal to its destination, and a receiver, which reproduces the message from the received optical signal
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Pager
A pager (also known as a beeper) is a wireless telecommunications device that receives and displays alphanumeric messages and/or receives and announces voice messages. One-way pagers can only receive messages, while response pagers and two-way pagers can also acknowledge, reply to, and originate messages using an internal transmitter.[1] Pagers operate as part of a paging system which includes one or more fixed transmitters (or in the case of response pagers and two-way pagers, one or more base stations), as well as a number of pagers carried by mobile users. These systems can range from a restaurant system with a single low-power transmitter, to a nationwide system with thousands of high-power base stations. Pagers were developed in the 1950s and 1960s, and became widely used by the 1980s
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Photophone
The photophone is a telecommunications device that allows transmission of speech on a beam of light. It was invented jointly by Alexander Graham Bell and his assistant Charles Sumner Tainter
Charles Sumner Tainter
on February 19, 1880, at Bell's laboratory at 1325 L Street in Washington, D.C.[1][2] Both were later to become full associates in the Volta Laboratory Association, created and financed by Bell. On June 3, 1880, Bell's assistant transmitted a wireless voice telephone message from the roof of the Franklin School to the window of Bell's laboratory, some 213 meters (about 700 ft.) away.[3][4][5][6] Bell believed the photophone was his most important invention
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History Of Prepay Mobile Phones
The history of the prepay mobile phone began in the 1990s when mobile phone operators sought to expand their market reach. Up until this point, mobile phone services were exclusively offered on a postpaid basis (contract-based), which excluded individuals with poor credit ratings and minors under the age of 18 (the typical age of contractual capacity). Nowadays the prepay mobile phone is found across the world.Contents1 First US prepay mobile phone installation 2 Early Providers of prepay services 3 Technical evolution 4 See also 5 ReferencesFirst US prepay mobile phone installation[edit] A patent for prepay mobile phones (Patent Number 5826185)[1] was filed on November 16, 1994
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Radiotelephone
A radiotelephone (or radiophone) is a communications system for transmission of speech over radio. Radiotelephone systems are very rarely interconnected with the public "land line" (POTS/PSTN) telephone network, and in some radio services, including GMRS,[1] such interconnection is prohibited. "Radiotelephony" means transmission of sound (audio) by radio, in contrast to radiotelegraphy (transmission of telegraph signals) or video transmission
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Communications Satellite
A communications satellite is an artificial satellite that relays and amplifies radio telecommunications signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth. Communications satellites are used for television, telephone, radio, internet, and military applications. There are over 2,000 communications satellites in Earth’s orbit, used by both private and government organizations.[1] Wireless communication uses electromagnetic waves to carry signals. These waves require line-of-sight, and are thus obstructed by the curvature of the Earth
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Flag Semaphore
Flag semaphore
Flag semaphore
(from the Greek σῆμα, sema, meaning sign and φέρω, phero, meaning to bear; altogether the sign-bearer) is the telegraphy system conveying information at a distance by means of visual signals with hand-held flags, rods, disks, paddles, or occasionally bare or gloved hands. Information is encoded by the position of the flags; it is read when the flag is in a fixed position
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Smartphone
A smartphone is a handheld personal computer with a mobile operating system and an integrated mobile broadband cellular network connection for voice, SMS, and Internet
Internet
data communication; most if not all smartphones also support Wi-Fi. Smartphones are typically pocket-sized, as opposed to tablet computers, which are much larger. They are able to run a variety of software components, known as “apps”. Most basic apps (e.g. event calendar, camera, web browser) come pre-installed with the system, while others are available for download from official sources like the Google Play Store
Google Play Store
or Apple App Store. Apps can receive bug fixes and gain additional functionality through software updates; similarly, operating systems are able to update
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Smoke Signal
The smoke signal is one of the oldest forms of long-distance communication. It is a form of visual communication used over long distance. In general smoke signals are used to transmit news, signal danger, or gather people to a common area.Contents1 History and usage 2 Examples2.1 Native Americans2.1.1 Yámana2.2 Noon Gun 2.3 Aboriginal Australians 2.4 Aviation3 Notes 4 References 5 External linksHistory and usage[edit] In ancient China, soldiers stationed along the Great Wall
Great Wall
would alert each other of impending enemy attack by signaling from tower to tower. In this way, they were able to transmit a message as far away as 750 kilometres (470 mi)[citation needed] in just a few hours. Abuse of the smoke signal is known to have contributed to the fall of the Western Zhou Dynasty in the 8th century BCE
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Telegraphy
Telegraphy
Telegraphy
(from Greek: τῆλε têle, "at a distance" and γράφειν gráphein, "to write") is the long-distance transmission of textual or symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message. Thus semaphore is a method of telegraphy, whereas pigeon post is not. Telegraphy
Telegraphy
requires that the method used for encoding the message be known to both sender and receiver. Many methods are designed according to the limits of the signalling medium used. The use of smoke signals, beacons, reflected light signals, and flag semaphore signals are early examples. In the 19th century, the harnessing of electricity led to the invention of electrical telegraphy. The advent of radio in the early 20th century brought about radiotelegraphy and other forms of wireless telegraphy
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Drums In Communication
Developed and used by cultures living in forested areas, drums served as an early form of long-distance communication, and were used during ceremonial and religious functions.Contents1 Types1.1 Talking drum 1.2 Slit gongs 1.3 Cambarysu2 Drum
Drum
languages 3 See also 4 References 5 External linksTypes[edit] Talking drum[edit] While this type of hour-glass shaped instrument can be modulated quite closely, its range is limited to a gathering or market-place, and it is primarily used in ceremonial settings
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Teleprinter
A teleprinter (teletypewriter, Teletype or TTY) is an electromechanical typewriter that can be used to send and receive typed messages through various communications channels, in both point-to-point and point-to-multipoint configurations. The machines were adapted to provide a user interface to early mainframe computers and minicomputers, sending typed data to the computer and printing the response. Some models could also be used to create punched tape for data storage (either from typed input or from data received from a remote source) and to read back such tape for local printing or transmission. Teleprinters could use a variety of different communication media. These included a simple pair of wires; dedicated non-switched telephone circuits (leased lines); switched networks that operated similarly to the public telephone network (telex); and radio and microwave links (telex-on-radio, or TOR)
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