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Comrex International
Comrex is an American corporation that designs and manufactures equipment for radio and television broadcasting. Beginnings Comrex was founded in 1961 by John Cheney, a broadcast engineer. His mission, as outlined in Comrex's inaugural press release, is "to apply advanced state of the art knowledge and techniques to the production of high quality, practical equipment which can be operated by non-technical personnel.” Throughout the 1960s and 1970s, Comrex developed audio products for the television market. In 1968, founder John Cheney developed Models 7035 and 7040 receivers for wireless microphone systems. In 1973, the 450 RA/TA wireless microphone system, designed for TV news, is the first to enable reporters to move more than 1000 feet from the camera. In 1975, The Comrex wireless cue system, composed of the CTA cue transmitter and the CRA (now LPQRA) receiver, enables field reporters and producers to hear production audio and instructions, without a wired connection to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devens, Massachusetts
Devens is a regional enterprise zone and census-designated place in the towns of Ayer and Shirley (in Middlesex County) and Harvard (in Worcester County) in the U.S. state of Massachusetts. It is the successor to Fort Devens, a military post that operated from 1917 to 1996. The population was 1,697 at the 2020 census, down from 1,840 in 2010. History The area itself is named after jurist and Civil War general Charles Devens. In 2011, the CDP tried to secede from Ayer, Shirley, and Harvard and become the 352nd town in the state but failed the vote. Some residents are still looking to secede to become a town. Military use The area operated as Camp Devens and later Fort Devens from 1917 to 1996. The Fort's sitting was due primarily to its location at a major hub of the rail network in New England. The United States Army, U.S. Army base was officially closed in 1996 after 79 years of service. Some parcels were retained by the federal military for use as the Devens Reserve For ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio
Radio is the technology of communicating using radio waves. Radio waves are electromagnetic waves of frequency between 3 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves. They can be received by other antennas connected to a radio receiver; this is the fundamental principle of radio communication. In addition to communication, radio is used for radar, radio navigation, remote control, remote sensing, and other applications. In radio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking, and satellite communication, among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on the radio wave by varying some aspect of the wave) in the transmitter. In radar, used to locate and track ob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Television Broadcasting
A television broadcaster or television network is a telecommunications network for the distribution of television content, where a central operation provides programming to many television stations, pay television providers or, in the United States, multichannel video programming distributors. Until the mid-1980s, broadcast programming on television in most countries of the world was dominated by a small number of terrestrial networks. Many early television networks such as the BBC, CBC, PBS, PTV, NBC or ABC in the US and in Australia evolved from earlier radio networks. Overview In countries where most networks broadcast identical, centrally originated content to all of their stations, and where most individual television transmitters therefore operate only as large " repeater stations", the terms "television network", " television channel" (a numeric identifier or radio frequency) and "television station" have become mostly interchangeable in everyday language, wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plain Old Telephone Service
Plain old telephone service (POTS), or publicly offered telephone service, is basic Voice band, voice-grade telephone service. Historically, POTS has been delivered by Analog signal, analog signal transmission over copper loops, but the term also describes Backward compatibility, backward-compatible analog connections offered by digital telephone systems. Copper loop POTS was the standard service offering from telephone companies in the United States from 1876 until 1988, when the Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) was introduced, followed by the development of mobile phone, cellular telephone systems and voice over internet protocol (VoIP). Despite the advent of these technologies, copper loop POTS remains a basic form of residential and small business connection to the telephone network in many parts of the world. The term encapsulates a technology that has been available since the introduction of the public telephone system in the late 19th c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Integrated Services Digital Network
Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the digitalised circuits of the public switched telephone network. Work on the standard began in 1980 at Bell Labs and was formally standardized in 1988 in the CCITT "Red Book". By the time the standard was released, newer networking systems with much greater speeds were available, and ISDN saw relatively little uptake in the wider market. One estimate suggests ISDN use peaked at a worldwide total of 25 million subscribers at a time when 1.3 billion analog lines were in use. ISDN has largely been replaced with digital subscriber line (DSL) systems of much higher performance. Prior to ISDN, the telephone system consisted of digital links like T1/ E1 on the long-distance lines between telephone company offices and analog signals on copper telephone wires to the customers, the " last mile". At the time, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IP Codec
IP most often refers to: * Intellectual property, creations of the mind for which exclusive legal rights are recognized * Internet Protocol, a set of rules for sending data across a network IP or Ip or ip may also refer to: Businesses and organizations * IP College (Indraprastha College for boys), a constituent college of the University of Delhi, New Delhi, India * Imperial Police, a former Indian police agency * '' Inicjatywa Pracownicza'' (Workers' Initiative), a Polish trade union * International Paper, an American pulp and paper company * Iraqi Police * Atyrau Airways (IATA code: IP) * Italiana Petroli, an Italian petroleum brand owned by Anonima Petroli Italiana Places * Ipswich, for Ipswich and surrounding areas, England * Ip, Sălaj, Romania * Ip (river), a river in Sălaj County, Romania * IP Casino Resort Spa, in Biloxi, Mississippi, US Science and technology Biology and medicine * Immunoprecipitation, a molecular biology technique * Incontinentia pigmenti, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telecommunications Equipment Vendors
Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information over a distance using electronic means, typically through cables, radio waves, or other communication technologies. These means of transmission may be divided into communication channels for multiplexing, allowing for a single medium to transmit several concurrent communication sessions. Long-distance technologies invented during the 20th and 21st centuries generally use electric power, and include the telegraph, telephone, television, and radio. Early telecommunication networks used metal wires as the medium for transmitting signals. These networks were used for telegraphy and telephony for many decades. In the first decade of the 20th century, a revolution in wireless communication began with breakthroughs including those made in radio communications by Guglielmo Marconi, who won the 1909 Nobel Prize in Physics. Other early pioneers in electrical and electronic tel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electronics Companies Established In 1961
Electronics is a scientific and engineering discipline that studies and applies the principles of physics to design, create, and operate devices that manipulate electrons and other electrically charged particles. It is a subfield of physics and electrical engineering which uses active devices such as transistors, diodes, and integrated circuits to control and amplify the flow of electric current and to convert it from one form to another, such as from alternating current (AC) to direct current (DC) or from analog signals to digital signals. Electronic devices have significantly influenced the development of many aspects of modern society, such as telecommunications, entertainment, education, health care, industry, and security. The main driving force behind the advancement of electronics is the semiconductor industry, which continually produces ever-more sophisticated electronic devices and circuits in response to global demand. The semiconductor industry is one of the global ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
