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Radio operator
A radio operator, known in Italian as a Marconisti, is a person certified to transmit and receive radiotelephone or radiotelegraph communications under government regulations, a role central to maritime safety after 1900.
Radio over fiber
Radio over fiber (RoF), also called radio frequency over fiber (RFoF), is a technique for distributing radio frequency signals over optical fiber to remote antennas.
Radio over IP
Radio over IP (RoIP) is a method of converting analog radio signals into packets carried over IP networks, most often through gateways linking radios, dispatch consoles, and telephones.
Radio receiver
A radio receiver is an electronic device that captures modulated radio-frequency signals and extracts the original information, from the 1906 crystal set to modern software-defined radios.
Radio silence
Radio silence, also called emissions control or EMCON, prohibits radio transmissions on a frequency or in an area, protecting distress traffic or denying adversaries direction finding.
Radio spectrum
The radio spectrum, also known as the wireless spectrum or radio bands, is the range of electromagnetic frequencies below 3,000 GHz used for wireless communication, navigation, and broadcasting.
Radio-controlled aerobatics
Radio-controlled aerobatics, known to participants as Pattern, is the FAI-judged flying of radio-controlled model aircraft through precision aerobatic schedules; its main class, F3A, held its first world championship in 1960.
Radio-controlled aircraft
A radio-controlled aircraft, also called an RC airplane, is a model aircraft flown from the ground using a hand-held radio transmitter driving its control surfaces.
Radio-controlled car
A radio-controlled car, also called an RC car, is a self-powered model car, typically 1/5 to 1/18 scale, driven by battery-electric or nitro engines and raced in IFMAR world championships.
Radio-controlled glider
A radio-controlled glider, also known as an RC sailplane, is an unpowered model aircraft kept aloft on thermals and slope lift, and raced in FAI class F3.
Radio-frequency identification
Radio-frequency identification (RFID) is a wireless identification technology in which a reader communicates with a tag over radio waves to identify goods, animals, or people.
Radioactive waste
Radioactive waste, also called atomic waste or radwaste, is material containing radionuclides above regulatory clearance levels, arising mainly from nuclear power generation, weapons programs, and medical, industrial, and research uses.
Radioactive Waste Management Limited
Radioactive Waste Management Limited was the UK body responsible for geological disposal of higher activity radioactive waste in England and Wales, merged into Nuclear Waste Services in 2022.
Radioisotope heater unit
A radioisotope heater unit (RHU) is a small spacecraft device that warms components through plutonium-238 decay, producing about one watt of heat with no moving parts or electrical power.
Radioisotope thermoelectric generator
A radioisotope thermoelectric generator (RTG) is a spacecraft power source that turns heat from decaying plutonium-238 into electricity with no moving parts, powering missions where sunlight is too faint for solar panels.
RadioML dataset
The RadioML dataset is a family of public radio signal datasets from DeepSig Inc., released from 2016, with labeled I/Q samples for training automatic modulation classification systems.
Radiosity (computer graphics)
Radiosity is a global illumination method in computer graphics that computes light exchange between diffusely reflecting surfaces, introduced at SIGGRAPH 1984 by Cornell University researchers.
Radiotelephone
Radiotelephone is telecommunication by radio waves carrying voice or other audio, covering ship-to-shore radio, air traffic control, and early wireless telephony; it contrasts with coded radiotelegraphy.
Radioteletype
Radioteletype (RTTY), or radio teletypewriter, is a method of sending printed text by radio, using frequency-shift keying to drive a teleprinter; amateurs adopted it in the 1950s.
Radisson Blu
Radisson Blu, formerly Radisson SAS, is an upper upscale hotel brand created in 1994, renamed in 2009, and the largest upper upscale hotel brand in Europe.
Radisson Converter Station
Radisson Converter Station is an HVDC converter station in northern Manitoba, owned by Manitoba Hydro near Gillam, which converts AC from Nelson River hydroelectric stations to DC for transmission to Winnipeg.
Radisson Hotels
Radisson Hotels is the central brand of Radisson Hotel Group, a Brussels-based company owned by Jin Jiang International that operates over 1,640 hotels in Europe, Asia-Pacific, and beyond.
RADIUS
RADIUS (Remote Authentication Dial-In User Service) is a client–server protocol carrying authentication, authorization, and accounting data, and the standard for Wi-Fi, DSL, and dial-up access.
Radix sort
Radix sort is a non-comparison sorting algorithm that sorts integers or strings one digit at a time with stable passes, achieving linear time when digits are fixed.
Radix tree
A radix tree, also called a Patricia trie, is a space-saving tree data structure for storing strings, in which chains of single-child nodes are merged into one node.
Radixact
Radixact is a ring-gantry radiation therapy system made by Accuray that delivers helical intensity-modulated radiotherapy with integrated image guidance; FDA cleared in 2016, it is the fourth-generation TomoTherapy platform.
Radome
A radome, or radar dome, is an electromagnetically transparent enclosure that protects an antenna while letting radio waves pass with minimal loss, covering ground radars, aircraft noses, and missile seekers.
Raduga
Raduga, secret designation Gran, was a series of Soviet and Russian military communications satellites, the first operational Soviet satellites in geostationary orbit, launched from 1975.
RAF Ascension Island
RAF Ascension Island, also known as Wideawake Airfield, is a Royal Air Force station on Ascension Island in the South Atlantic, a staging post for UK–Falklands flights.
RAF Bomber Command
RAF Bomber Command was the Royal Air Force command controlling its bomber forces from 1936 to 1968, best known for the World War II night bombing offensive against Germany.