51 relations: Africa, Amateur radio, Amateur radio satellite, AMSAT, Australia, Bandstacked, Cable television, China, Communications satellite, Direct-broadcast satellite, Electromagnetic spectrum, Electronic countermeasure, Electronics, Europe, Hertz, India, Indian National Satellite System, Infrared, Institute of Electrical and Electronics Engineers, International Telecommunication Union, Japan, Ku band, Metre, Microwave, Mobile phone, NATO, New Zealand, North America, Optical amplifier, Optical communication, Pakistan, Polarization (waves), Precipitation, Radar, Radio frequency, Rain fade, Russia, Satellite dish, Southeast Asia, Super high frequency, Telecommunication, Telephone, Television receive-only, Transponder (satellite communications), Ultra high frequency, Water vapor, Wavelength, Weather radar, Wi-Fi, 4DTV, ..., 5-centimeter band. Expand index (1 more) » « Shrink index
Africa is the world's second-largest and second-most-populous continent.
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Amateur radio (also called "ham" radio) describes the use of radio frequency spectra for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation and emergency communication.
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An amateur radio satellite is an artificial satellite built and used by amateur radio operators for use in the Amateur-satellite service.
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AMSAT is a name for amateur radio satellite organizations worldwide, but in particular the Radio Amateur Satellite Corporation (AMSAT-NA) with headquarters at Kensington, Maryland, near Washington, D.C. AMSAT organizations design, build, arrange launches for, and then operate (command) satellites carrying amateur radio payloads, including the OSCAR series of satellites.
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Australia (colloquially), officially the Commonwealth of Australia, is an Oceanian country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands.
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The term Bandstacked applies to an antenna or satellite feedhorn (LNBF) that is designed to operate on two or more bands of frequencies.
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Cable television is a system of delivering television programming to paying subscribers via radio frequency (RF) signals transmitted through coaxial cables or light pulses through fiber-optic cables.
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China, officially the People's Republic of China (PRC), is a sovereign state in East Asia.
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A communications satellite is an artificial satellite that relays and amplifies through the use of a transponder, radio telecommunications signals, between a source and a receiver.
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Direct-broadcast satellite (DBS) is a type of artificial satellite which usually sends satellite television signals for home reception.
The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation.
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An electronic countermeasure (ECM) is an electrical or electronic device designed to trick or deceive radar, sonar or other detection systems, like infrared (IR) or lasers.
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Electronics is the science of how to control electric energy, energy in which the electrons have a fundamental role.
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Europe is a continent that comprises the westernmost part of Eurasia.
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The hertz (symbol Hz) is the unit of frequency in the International System of Units (SI) and is defined as one cycle per second.
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India, officially the Republic of India, is a country in South Asia.
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INSAT or the Indian National Satellite System is a series of multipurpose geo-stationary satellites launched by ISRO to satisfy the telecommunications, broadcasting, meteorology, and search and rescue operations.
Infrared (IR) is invisible radiant energy, electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum at 700 nanometers (frequency 430 THz) to 1 mm (300 GHz) (although people can see infrared up to at least 1050 nm in experiments).
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The Institute of Electrical and Electronics Engineers (IEEE) is a professional association with its corporate office in New York City and its operations center in Piscataway, New Jersey.
The International Telecommunication Union (ITU; Union Internationale des Télécommunications), originally the International Telegraph Union (Union Télégraphique Internationale), is a specialized agency of the United Nations (UN) that is responsible for issues that concern information and communication technologies.
Japan (日本 Nippon or Nihon; formally or Nihon-koku, "State of Japan") is an island country in East Asia.
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The Ku band (pronunciation) is the 12–18 GHz portion of the electromagnetic spectrum in the microwave range of frequencies.
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The metre, American spelling meter, (from the Greek noun μέτρον, "measure") is the base unit of length in the International System of Units (SI).
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Microwaves are a form of electromagnetic radiation with wavelengths ranging from as long as one meter to as short as one millimeter; with frequencies between and.
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A mobile phone (also known as a cellular phone, cell phone, hand phone, or simply a phone) is a phone that can make and receive telephone calls over a radio link while moving around a wide geographic area.
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The North Atlantic Treaty Organization (NATO; Organisation du traité de l'Atlantique Nord; OTAN), also called the North Atlantic Alliance, is an intergovernmental military alliance based on the North Atlantic Treaty which was signed on 4 April 1949.
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New Zealand (Aotearoa) is an island country in the southwestern Pacific Ocean.
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North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere.
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An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal.
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Optical communication, also known as optical telecommunication, is communication at a distance using light to carry information.
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Pakistan (or; پاكستان ALA-LC), officially the Islamic Republic of Pakistan (اسلامی جمہوریۂ پاكستان ALA-LC), is a sovereign country in South Asia.
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Polarization (also polarisation) is a property of waves that can oscillate with more than one orientation.
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In meteorology, precipitation is any product of the condensation of atmospheric water vapour that falls under gravity.
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Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.
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Radio frequency (RF): any of the electromagnetic wave frequencies that lie in the range extending from around to, which include those frequencies used for communications or radar signals.
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Rain fade refers primarily to the absorption of a microwave radio frequency (RF) signal by atmospheric rain, snow or ice, and losses which are especially prevalent at frequencies above 11 GHz.
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Russia (Ru-Россия.ogg), also officially known as the Russian Federation (a), is a country in northern Eurasia.
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A satellite dish is a dish-shaped type of parabolic antenna designed to receive electromagnetic signals from satellites, which transmit data transmissions or broadcasts, such as satellite television.
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Southeast Asia or Southeastern Asia is a subregion of Asia, consisting of the countries that are geographically south of China, east of India, west of New Guinea and north of Australia.
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Super high frequency (SHF) is the ITU designation for radio frequencies (RF) in the range between 3 GHz and 30 GHz.
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Telecommunication occurs when the exchange of information between two or more entities (communication) includes the use of technology.
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A telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.
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Television receive-only (TVRO) is a term used chiefly in North America to refer to the reception of satellite television from FSS-type satellites, generally on C-band analog; free-to-air and unconnected to a commercial DBS provider.
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A communications satellite's transponder is the series of interconnected units that form a communications channel between the receiving and the transmitting antennas.
Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 MHz and 3 GHz, also known as the decimetre band as the wavelengths range from one meter to one decimetre.
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Water vapor, or water vapour or aqueous vapor, is the gaseous phase of water. It is one state of water within the hydrosphere. Water vapor can be produced from the evaporation or boiling of liquid water or from the sublimation of ice. Unlike other forms of water, water vapor is invisible. Under typical atmospheric conditions, water vapor is continuously generated by evaporation and removed by condensation. It is lighter than air and triggers convection currents that can lead to clouds. Water vapor is a relatively common atmospheric constituent, present even in the solar atmosphere as well as every planet in the Solar System and many astronomical objects including natural satellites, comets and even large asteroids. Likewise the detection of extrasolar water vapor would indicate a similar distribution in other planetary systems. Water vapor is significant in that it can be indirect evidence supporting the presence of extraterrestrial liquid water in the case of some planetary mass objects. Being a component of Earth's hydrosphere and hydrologic cycle, it is particularly abundant in Earth's atmosphere where it is also a potent greenhouse gas along with other gases such as carbon dioxide and methane. Use of water vapor, as steam, has been important to humans for cooking and as a major component in energy production and transport systems since the industrial revolution.
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In physics, the wavelength of a sinusoidal wave is the spatial period of the wave—the distance over which the wave's shape repeats, and the inverse of the spatial frequency.
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Weather radar, also called weather surveillance radar (WSR) and Doppler weather radar, is a type of radar used to locate precipitation, calculate its motion, and estimate its type (rain, snow, hail etc.). Modern weather radars are mostly pulse-Doppler radars, capable of detecting the motion of rain droplets in addition to the intensity of the precipitation.
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Wi-Fi (or WiFi) is a local area wireless computer networking technology that allows electronic devices to network, mainly using the UHF and SHF ISM radio bands.
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4DTV is the name of a Television receive-only (TVRO) consumer satellite television tuner technology manufactured by Motorola for use with large-diameter parabolic satellite dish antennas on the C and Ku frequency bands on multiple satellites.
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The 5 centimeter or 5 GHz band is a portion of the SHF (microwave) radio spectrum internationally allocated to amateur radio and amateur satellite use on a secondary basis.
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