157 relations: Amateur radio, American Radio Relay League, Antenna (radio), Apollo Bay, ARCNET, Arithmetic mean, AT&T Corporation, Balanced line, Balun, Baseband, Bell Labs, Bellows, Birmingham, BNC connector, Boing Boing, British Standards, Broadcasting, BT Group, Cable modem, Cable television, Capacitance, Capacitor, Characteristic impedance, Citizens band radio, Closed-circuit television, Coaxial, CommScope, Communication, Computer network, Crosstalk, Cutoff frequency, Decibel, Dielectric, Dielectric loss, Digital audio, Dipole antenna, Direct-buried cable, DiSEqC, E-carrier, EIA RF Connectors, Electric arc, Electrical cable, Electrical conductor, Electrical connector, Electrical resistance and conductance, Electromagnetic field, Electromagnetic interference, Electromagnetic radiation, Electromagnetic shielding, England, ..., Ethernet, F connector, Farad, Feed line, General Post Office, Geometric mean, Germany, Ghosting (television), Google Books, Ground loop (electricity), Henry (unit), Herman Affel, Hertz, IBM 3270, Impedance matching, Inductance, International Electrotechnical Commission, Internet, Internet access, Joint Electronics Type Designation System, L-carrier, Leipzig, LEMO, Lloyd Espenschied, London, Low-noise amplifier, Maximum power transfer theorem, Melbourne, Minneapolis, Mu-metal, N connector, Neutron, New York City, Nikola Tesla, Nitrogen, Noise (electronics), Nuclear Instrumentation Module, Nuclear reactor, Ohm's law, Oliver Heaviside, Optical fiber, Overhead line, Paul J. Nahin, Permeability (electromagnetism), Permittivity, Phase velocity, Philadelphia, Plenum cable, Polyethylene, Polytetrafluoroethylene, Polyvinyl chloride, Radiation, Radiation pattern, Radio, Radio frequency, Radio frequency power transmission, Radio masts and towers, Radio network, Radio receiver, Redox, Relative permittivity, RG-58, RG-59, RG-6, S/PDIF, Satellite, Satellite dish, Satellite television, Shielded cable, Siemens & Halske, Siemens (unit), Silicone grease, Silver sulfide, Single-wire transmission line, Skin effect, Standing wave ratio, Stanley, Tasmania, T-carrier, TAT-1, Telegrapher's equations, Television, Television antenna, Television network, Television set, Time (magazine), Transformer, Transmission line, Transmitter, Transverse mode, Twin-lead, Twisted pair, Two-way radio, Ultraviolet, United States, United States Military Standard, Velocity factor, Video, Video Graphics Array, Wave interference, Waveguide, Waveguide (electromagnetism), Wi-Fi, World War II, 10BASE2, 10BASE5, 1936 Summer Olympics, 3C-2V. Expand index (107 more) » « Shrink index
Amateur radio, also known as ham radio, describes the use of radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communication.
The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the USA.
In radio, an antenna is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver.
Apollo Bay is a coastal town in southwestern Victoria, Australia.
Attached Resource Computer NETwork (ARCNET or ARCnet) is a communications protocol for local area networks.
In mathematics and statistics, the arithmetic mean (stress on third syllable of "arithmetic"), or simply the mean or average when the context is clear, is the sum of a collection of numbers divided by the number of numbers in the collection.
AT&T Corp., originally the American Telephone and Telegraph Company, is the subsidiary of AT&T that provides voice, video, data, and Internet telecommunications and professional services to businesses, consumers, and government agencies.
In telecommunications and professional audio, a balanced line or balanced signal pair is a transmission line consisting of two conductors of the same type, each of which have equal impedances along their lengths and equal impedances to ground and to other circuits.
A balun (for balanced to unbalanced) is an electrical device that converts between a balanced signal (two signals working against each other where ground is irrelevant) and an unbalanced signal (a single signal working against ground or pseudo-ground).
Baseband is a signal that has a very narrow and near-zero frequency range, i.e. a spectral magnitude that is nonzero only for frequencies in the vicinity of the origin (termed f.
Nokia Bell Labs (formerly named AT&T Bell Laboratories, Bell Telephone Laboratories and Bell Labs) is an American research and scientific development company, owned by Finnish company Nokia.
A bellows or pair of bellows is a device constructed to furnish a strong blast of air.
Birmingham is a city and metropolitan borough in the West Midlands, England, with an estimated population of 1,101,360, making it the second most populous city of England and the United Kingdom.
The BNC (Bayonet Neill–Concelman) connector is a miniature quick connect/disconnect radio frequency connector used for coaxial cable.
Boing Boing is a website, first established as a zine in 1988, later becoming a group blog.
British Standards (BS) are the standards produced by the BSI Group which is incorporated under a Royal Charter (and which is formally designated as the National Standards Body (NSB) for the UK).
Broadcasting is the distribution of audio or video content to a dispersed audience via any electronic mass communications medium, but typically one using the electromagnetic spectrum (radio waves), in a one-to-many model.
BT Group plc (trading as BT and formerly British Telecom) is a British multinational telecommunications holding company with head offices in London, United Kingdom.
A cable modem is a type of network bridge that provides bi-directional data communication via radio frequency channels on a hybrid fibre-coaxial (HFC) and radio frequency over glass (RFoG) infrastructure.
Cable television is a system of delivering television programming to paying subscribers via radio frequency (RF) signals transmitted through coaxial cables, or in more recent systems, light pulses through fiber-optic cables.
Capacitance is the ratio of the change in an electric charge in a system to the corresponding change in its electric potential.
A capacitor is a passive two-terminal electrical component that stores potential energy in an electric field.
The characteristic impedance or surge impedance (usually written Z0) of a uniform transmission line is the ratio of the amplitudes of voltage and current of a single wave propagating along the line; that is, a wave travelling in one direction in the absence of reflections in the other direction.
Citizens band radio (also known as CB radio) is, in many countries, a system of short-distance radio communications between individuals typically on a selection of 40 channels within the 27 MHz (11 m) band.
Closed-circuit television (CCTV), also known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors.
In geometry, coaxial means that two or more three-dimensional linear forms share a common axis.
CommScope Inc., which opened in 1976, is a multi-national network infrastructure provider company based in Hickory, North Carolina, United States.
Communication (from Latin commūnicāre, meaning "to share") is the act of conveying intended meanings from one entity or group to another through the use of mutually understood signs and semiotic rules.
A computer network, or data network, is a digital telecommunications network which allows nodes to share resources.
In electronics, crosstalk is any phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel.
In physics and electrical engineering, a cutoff frequency, corner frequency, or break frequency is a boundary in a system's frequency response at which energy flowing through the system begins to be reduced (attenuated or reflected) rather than passing through.
The decibel (symbol: dB) is a unit of measurement used to express the ratio of one value of a physical property to another on a logarithmic scale.
A dielectric (or dielectric material) is an electrical insulator that can be polarized by an applied electric field.
Dielectric loss quantifies a dielectric material's inherent dissipation of electromagnetic energy (e.g. heat).
Digital audio is audio, or simply sound, signal that has been recorded as or converted into digital form, where the sound wave of the audio signal is encoded as numerical samples in continuous sequence, typically at CD audio quality which is 16 bit sample depth over 44.1 thousand samples per second.
In radio and telecommunications a dipole antenna or doublet is the simplest and most widely used class of antenna.
Direct-buried cable (DBC) is a kind of communications or transmissions electrical cable which is especially designed to be buried under the ground without any kind of extra covering, sheathing, or piping to protect it.
DiSEqC (Digital Satellite Equipment Control), pronounced "Die-Sec", is a special communication protocol for use between a satellite receiver and a device such as a multi-dish switch or a small dish antenna rotor.
The E-carrier is a member of the series of carrier systems developed for digital transmission of many simultaneous telephone calls by time-division multiplexing.
EIA RF Connectors are used to connect two items of high power radio frequency rigid or semi-rigid (flexline) coaxial transmission line.
An electric arc, or arc discharge, is an electrical breakdown of a gas that produces an ongoing electrical discharge.
An electrical cable is an assembly of one or more wires running side by side or bundled, which is used to carry electric current.
In physics and electrical engineering, a conductor is an object or type of material that allows the flow of an electrical current in one or more directions.
An electrical connector, is an electro-mechanical device used to join electrical terminations and create an electrical circuit.
The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor.
An electromagnetic field (also EMF or EM field) is a physical field produced by electrically charged objects.
Electromagnetic interference (EMI), also called radio-frequency interference (RFI) when in the radio frequency spectrum, is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction.
In physics, electromagnetic radiation (EM radiation or EMR) refers to the waves (or their quanta, photons) of the electromagnetic field, propagating (radiating) through space-time, carrying electromagnetic radiant energy.
Electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials.
England is a country that is part of the United Kingdom.
Ethernet is a family of computer networking technologies commonly used in local area networks (LAN), metropolitan area networks (MAN) and wide area networks (WAN).
The F connector (also F-type) is a coaxial RF connector commonly used for "over the air" terrestrial television, cable television and universally for satellite television and cable modems, usually with RG-6/U cable or, in older installations, with RG-59/U cable.
The farad (symbol: F) is the SI derived unit of electrical capacitance, the ability of a body to store an electrical charge.
In a radio antenna, the feed line (feedline), or feeder, is the cable or other transmission line that connects the antenna with the radio transmitter or receiver.
The General Post Office (GPO) was officially established in England in 1660 by Charles II and it eventually grew to combine the functions of state postal system and telecommunications carrier.
In mathematics, the geometric mean is a mean or average, which indicates the central tendency or typical value of a set of numbers by using the product of their values (as opposed to the arithmetic mean which uses their sum).
Germany (Deutschland), officially the Federal Republic of Germany (Bundesrepublik Deutschland), is a sovereign state in central-western Europe.
In television, a ghost is a replica of the transmitted image, offset in position, that is super-imposed on top of the main image.
Google Books (previously known as Google Book Search and Google Print and by its codename Project Ocean) is a service from Google Inc. that searches the full text of books and magazines that Google has scanned, converted to text using optical character recognition (OCR), and stored in its digital database.
In an electrical system, a ground loop or earth loop occurs when two points of a circuit both intended to be at ground reference potential have a potential between them.
The henry (symbol: H) is the SI derived unit of electrical inductance.
Herman Andrew Affel (August 4, 1893 – October 13, 1972) was an American electrical engineer who invented the modern coaxial cable.
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.
The IBM 3270 is a class of block oriented computer terminal (sometimes called display devices) introduced by IBM in 1971 normally used to communicate with IBM mainframes.
In electronics, impedance matching is the practice of designing the input impedance of an electrical load or the output impedance of its corresponding signal source to maximize the power transfer or minimize signal reflection from the load.
In electromagnetism and electronics, inductance is the property of an electrical conductor by which a change in electric current through it induces an electromotive force (voltage) in the conductor.
The International Electrotechnical Commission (IEC; in French: Commission électrotechnique internationale) is an international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies – collectively known as "electrotechnology".
The Internet is the global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide.
Internet access is the ability of individuals and organizations to connect to the Internet using computer terminals, computers, and other devices; and to access services such as email and the World Wide Web.
The Joint Electronics Type Designation System (JETDS), which was previously known as the Joint Army-Navy Nomenclature System (AN System. JAN) and the Joint Communications-Electronics Nomenclature System, is a method developed by the U.S. War Department during World War II for assigning an unclassified designator to electronic equipment.
The Transcontinental Cable System or L-carrier system was developed by AT&T to create a high capacity transmission facility using coaxial cable, a fairly new medium for HF to RF signal transmission invented in 1927 by Lloyd Espenschied of Bell Telephone Laboratories for long distance communications.
Leipzig is the most populous city in the federal state of Saxony, Germany.
LEMO is both the name of an electronic and fibre optic connector manufacturer, based in Écublens, Switzerland, and the name commonly used to refer to push-pull connectors made by that company.
Lloyd Espenschied (27 April 1889 – June 1, 1986) was an American electrical engineer who invented the modern coaxial cable with Herman Andrew Affel.
London is the capital and most populous city of England and the United Kingdom.
A low-noise amplifier (LNA) is an electronic amplifier that amplifies a very low-power signal without significantly degrading its signal-to-noise ratio.
In electrical engineering, the maximum power transfer theorem states that, to obtain maximum external power from a source with a finite internal resistance, the resistance of the load must equal the resistance of the source as viewed from its output terminals.
Melbourne is the state capital of Victoria and the second-most populous city in Australia and Oceania.
Minneapolis is the county seat of Hennepin County, and the larger of the Twin Cities, the 16th-largest metropolitan area in the United States.
Mu-metal is a nickel–iron soft ferromagnetic alloy with very high permeability, which is used for shielding sensitive electronic equipment against static or low-frequency magnetic fields.
The N connector (in full, Type N connector) is a threaded, weatherproof, medium-size RF connector used to join coaxial cables.
The City of New York, often called New York City (NYC) or simply New York, is the most populous city in the United States.
Nikola Tesla (Никола Тесла; 10 July 1856 – 7 January 1943) was a Serbian-American inventor, electrical engineer, mechanical engineer, physicist, and futurist who is best known for his contributions to the design of the modern alternating current (AC) electricity supply system.
Nitrogen is a chemical element with symbol N and atomic number 7.
In electronics, noise is an unwanted disturbance in an electrical signal.
The Nuclear Instrumentation Module (NIM) standard defines mechanical and electrical specifications for electronics modules used in experimental particle and nuclear physics.
A nuclear reactor, formerly known as an atomic pile, is a device used to initiate and control a self-sustained nuclear chain reaction.
Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.
Oliver Heaviside FRS (18 May 1850 – 3 February 1925) was an English self-taught electrical engineer, mathematician, and physicist who adapted complex numbers to the study of electrical circuits, invented mathematical techniques for the solution of differential equations (equivalent to Laplace transforms), reformulated Maxwell's field equations in terms of electric and magnetic forces and energy flux, and independently co-formulated vector analysis.
An optical fiber or optical fibre is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair.
An overhead line or overhead wire is used to transmit electrical energy to trams, trolleybuses or trains.
Paul J. Nahin (born November 26, 1940) is an engineer and author who has written 18 books on topics in physics and mathematics, including biographies of Oliver Heaviside, George Boole, and Claude Shannon, books on mathematical concepts such as Euler's formula and the imaginary unit, and a number of books on the physics and philosophical puzzles of time travel.
In electromagnetism, permeability is the measure of the ability of a material to support the formation of a magnetic field within itself.
In electromagnetism, absolute permittivity, often simply called permittivity, usually denoted by the Greek letter ε (epsilon), is the measure of resistance that is encountered when forming an electric field in a particular medium.
The phase velocity of a wave is the rate at which the phase of the wave propagates in space.
Philadelphia is the largest city in the U.S. state and Commonwealth of Pennsylvania, and the sixth-most populous U.S. city, with a 2017 census-estimated population of 1,580,863.
Plenum cable is electrical cable that is laid in the plenum spaces of buildings.
Polyethylene or polythene (abbreviated PE; IUPAC name polyethene or poly(ethylene)) is the most common plastic.
Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene that has numerous applications.
Polyvinyl chloride, also known as polyvinyl or '''vinyl''', commonly abbreviated PVC, is the world's third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene.
In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium.
In the field of antenna design the term radiation pattern (or antenna pattern or far-field pattern) refers to the directional (angular) dependence of the strength of the radio waves from the antenna or other source.
Radio is the technology of using radio waves to carry information, such as sound, by systematically modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width.
Radio frequency (RF) refers to oscillatory change in voltage or current in a circuit, waveguide or transmission line in the range extending from around twenty thousand times per second to around three hundred billion times per second, roughly between the upper limit of audio and the lower limit of infrared.
Radio frequency power transmission is the transmission of the output power of a transmitter to an antenna.
Radio masts and towers are, typically, tall structures designed to support antennas (also known as aerials) for telecommunications and broadcasting, including television.
There are two types of radio networks currently in use around the world: the one-to-many broadcast network commonly used for public information and mass media entertainment; and the two-way radio type used more commonly for public safety and public services such as police, fire, taxicabs, and delivery services.
In radio communications, a radio receiver (receiver or simply radio) is an electronic device that receives radio waves and converts the information carried by them to a usable form.
Redox (short for reduction–oxidation reaction) (pronunciation: or) is a chemical reaction in which the oxidation states of atoms are changed.
The relative permittivity of a material is its (absolute) permittivity expressed as a ratio relative to the permittivity of vacuum.
RG-58/U is a type of coaxial cable often used for low-power signal and RF connections.
RG-59/U is a specific type of coaxial cable, often used for low-power video and RF signal connections.
RG-6/U is a common type of coaxial cable used in a wide variety of residential and commercial applications.
S/PDIF (Sony/Philips Digital Interface) is a type of digital audio interconnect used in consumer audio equipment to output audio over reasonably short distances.
In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit.
A satellite dish is a dish-shaped type of parabolic antenna designed to receive or transmit information by radio waves to or from a communication satellite.
Satellite television is a service that delivers television programming to viewers by relaying it from a communications satellite orbiting the Earth directly to the viewer's location.
A shielded cable is an electrical cable of one or more insulated conductors enclosed by a common conductive layer.
Siemens & Halske AG (or Siemens-Halske) was a German electrical engineering company that later became part of Siemens.
The siemens (symbol: S) is the derived unit of electric conductance, electric susceptance and electric admittance in the International System of Units (SI).
Silicone grease is a waterproof grease made by combining a silicone oil with a thickener.
Silver sulfide is the sulfide of silver.
A single-wire transmission line (or single wire method) is a method of transmitting electrical power or signals using only a single electrical conductor.
Skin effect is the tendency of an alternating electric current (AC) to become distributed within a conductor such that the current density is largest near the surface of the conductor, and decreases with greater depths in the conductor.
In radio engineering and telecommunications, standing wave ratio (SWR) is a measure of impedance matching of loads to the characteristic impedance of a transmission line or waveguide.
Stanley is a town on the north-west coast of Tasmania, Australia.
The T-carrier is a member of the series of carrier systems developed by AT&T Bell Laboratories for digital transmission of multiplexed telephone calls.
TAT-1 (Transatlantic No. 1) was the first submarine transatlantic telephone cable system.
The telegrapher's equations (or just telegraph equations) are a pair of coupled, linear differential equations that describe the voltage and current on an electrical transmission line with distance and time.
Television (TV) is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in colour, and in two or three dimensions and sound.
A television antenna, or TV aerial, is an antenna specifically designed for the reception of over-the-air broadcast television signals, which are transmitted at frequencies from about 41 to 250 MHz in the VHF band, and 470 to 960 MHz in the UHF band in different countries.
A television network is a telecommunications network for distribution of television program content, whereby a central operation provides programming to many television stations or pay television providers.
A television set or television receiver, more commonly called a television, TV, TV set, or telly, is a device that combines a tuner, display, and loudspeakers for the purpose of viewing television.
Time is an American weekly news magazine and news website published in New York City.
A transformer is a static electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.
In communications and electronic engineering, a transmission line is a specialized cable or other structure designed to conduct alternating current of radio frequency, that is, currents with a frequency high enough that their wave nature must be taken into account.
In electronics and telecommunications, a transmitter or radio transmitter is an electronic device which produces radio waves with an antenna.
A transverse mode of electromagnetic radiation is a particular electromagnetic field pattern of radiation measured in a plane perpendicular (i.e., transverse) to the propagation direction of the beam.
Twin-lead cable is a two-conductor flat cable used as a balanced transmission line to carry radio frequency (RF) signals.
Twisted pair cabling is a type of wiring in which two conductors of a single circuit are twisted together for the purposes of improving electromagnetic compatibility.
A two-way radio is a radio that can do both transmit and receive a signal (a transceiver), unlike a broadcast receiver which only receives content.
Ultraviolet (UV) is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays.
The United States of America (USA), commonly known as the United States (U.S.) or America, is a federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions.
A United States defense standard, often called a military standard, "MIL-STD", "MIL-SPEC", or (informally) "MilSpecs", is used to help achieve standardization objectives by the U.S. Department of Defense.
The velocity factor (VF), also called wave propagation speed or velocity of propagation (VoP or of a transmission medium is the ratio of the speed at which a wavefront (of an electromagnetic signal, a radio signal, a light pulse in an optical fibre or a change of the electrical voltage on a copper wire) passes through the medium, to the speed of light in a vacuum.
Video is an electronic medium for the recording, copying, playback, broadcasting, and display of moving visual media.
Video Graphics Array (VGA) is the display hardware first introduced with the IBM PS/2 line of computers in 1987, following CGA and EGA introduced in earlier IBM personal computers.
In physics, interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude.
A waveguide is a structure that guides waves, such as electromagnetic waves or sound, with minimal loss of energy by restricting expansion to one dimension or two.
In electromagnetics and communications engineering, the term waveguide may refer to any linear structure that conveys electromagnetic waves between its endpoints.
Wi-Fi or WiFi is technology for radio wireless local area networking of devices based on the IEEE 802.11 standards.
World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although conflicts reflecting the ideological clash between what would become the Allied and Axis blocs began earlier.
10BASE2 (also known as cheapernet, thin Ethernet, thinnet, and thinwire) is a variant of Ethernet that uses thin coaxial cable terminated with BNC connectors.
10BASE5 (also known as thick Ethernet or thicknet) was the first commercially available variant of Ethernet.
The 1936 Summer Olympics (German: Olympische Sommerspiele 1936), officially known as the Games of the XI Olympiad, was an international multi-sport event held in 1936 in Berlin, Nazi Germany.
3C-2V is commonly marked on low cost coaxial cable used for domestic TV signals.
Co-axial Cable, Co-axial cable, Coax, Coax cable, Coaxial Cable, Coaxial Cables, Coaxial cables, Coaxial cabling, Coaxial capacitor, Egress (signal leakage), Heliax, Heliax cable, Ingress (signal leakage), LMR-400, LMR-600, RG-174, RG-179, RG-213, RG-8, RG-8 cable, RG174.