Communications satelliteArtificial satellite that relays radio signals An Iridium satellite for satellite telephony Part of a series onSpaceflight History History of spaceflight Space Race Timeline of spaceflight Space probes Lunar missions Mars missions Applications Communications Earth observation Exploration Espionage Military Navigation Colonization Habitation Exploration Telescopes Tourism Spacecraft Robotic spacecraft Satellite Space probe Cargo spacecraft Crewed spacecraft Apollo Lunar Module Space capsules Space Shuttle Space stations Spaceplanes Vostok Space launch Spaceport Launch pad Expendable and reusable launch vehicles Escape velocity Non-rocket spacelaunch Spaceflight types Sub-orbital Orbital Interplanetary Interstellar Intergalactic List of space organizations Space agencies Space forces Companies Spaceflight portalvte A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth.
MicrowaveMicrowave is a form of electromagnetic radiation with wavelengths shorter than other radio waves but longer than infrared waves. Its wavelength ranges from about one meter to one millimeter, corresponding to frequencies between 300 MHz and 300 GHz, broadly construed. A more common definition in radio-frequency engineering is the range between 1 and 100 GHz (wavelengths between 30 cm and 3 mm), or between 1 and 3000 GHz (30 cm and 0.1 mm).
Weather radarRadar used to locate and monitor meteorological conditionsWeather radar in Norman, Oklahoma with rainshaftWeather (WF44) radar dishUniversity of OklahomaOU-PRIME C-band, polarimetric, weather radar during constructionA 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.).
Electromagnetic spectrumThe electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band. From low to high frequency these are: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
Baby monitorA baby monitor, also known as a baby alarm, is a radio system used to remotely listen to sounds made by an infant. An audio monitor consists of a transmitter unit, equipped with a microphone, placed near the child. It transmits the sounds by radio waves to a receiver unit with a speaker carried by, or near to, the person caring for the infant. Some baby monitors provide two-way communication which allows the parent to speak back to the baby (parent talk-back).
Cordless telephonePortable telephone that connects to a landline Two cordless telephones 3 VTech cordless landline phones A Panasonic KX-TG2226B 2.4GHz cordless phone with answering machine A cordless telephone or portable telephone is a portable telephone handset that connects by radio to a base station connected to the public telephone network. The operational range is limited, usually to the same building or within some short distance from the base station.
DoorbellA doorbell is a signaling device typically placed near a door to a building's entrance. When a visitor presses a button, the bell rings inside the building, alerting the occupant to the presence of the visitor. Although the first doorbells were mechanical, activated by pulling a cord connected to a bell, modern doorbells are electric, operated by a pushbutton switch. Modern doorbells often incorporate intercoms and miniature video cameras to increase security.ISM radio bandThe ISM radio bands are portions of the radio spectrum reserved internationally for industrial, scientific and medical (ISM) purposes, excluding applications in telecommunications. Examples of applications for the use of radio frequency (RF) energy in these bands include RF heating, microwave ovens, and medical diathermy machines.
HertzThe hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), often described as being equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose formal expression in terms of SI base units is 1/s or s−1, meaning that one hertz is one per second or the reciprocal of one second. It is used only in the case of periodic events.
SurveillanceMonitoring something for the purposes of influencing, protecting, or suppressing itSurveillance cameras at Tiananmen Square, 2009Surveillance cameras in Gdynia, PolandSurveillance is the systematic observation and monitoring of a person, population, or location, with the purpose of information-gathering, influencing, managing, or directing. It is widely used by governments for a variety of reasons, such as law enforcement, national security, and information awareness.
Institute of Electrical and Electronics EngineersThe Institute of Electrical and Electronics Engineers (IEEE, pronounced eye-triple-ee) is an American 501(c)(3) charitable professional organization for electrical engineering, electronics engineering, and related disciplines. The IEEE has a corporate office in New York City and an operations center in Piscataway, New Jersey. The IEEE was formed in 1963 as an amalgamation of the American Institute of Electrical Engineers and the Institute of Radio Engineers.
Garage door openerA garage door opener is a motorized device that opens and closes a garage door controlled by switches on the garage wall. Most also include a handheld radio remote control carried by the owner, which can be used to open and close the door from a short distance.*As an Amazon Associate I earn from qualifying purchases.