Flashcards: Radio technology

Microwaves are a form of electromagnetic radiation with wavelengths ranging from one meter to one millimeter; with frequencies between 300 MHz (100 cm) and 300 GHz (0.1 cm).

Radio control (often abbreviated to R/C or simply RC) is the use of radio signals to remotely control a device.

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction.

A corner reflector is a retroreflector consisting of three mutually perpendicular, intersecting flat surfaces, which reflects waves back directly towards the source, but translated.

The Family Radio Service (FRS) is an improved walkie-talkie radio system authorized in the United States since 1996.

A microphone, colloquially nicknamed mic or mike (/ˈmaɪk/), is a transducer that converts sound into an electrical signal.

In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a sufficiently strong desired input signal.

Ferrite circulators are radio frequency circulators which are composed of magnetised ferrite materials.

An operational amplifier (often op-amp or opamp) is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output.

Tube sound (or valve sound) is the characteristic sound associated with a vacuum tube-based audio amplifier.

An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave.

A resonance chamber uses resonance to amplify sound.

A spectrum analyzer measures the magnitude of an input signal versus frequency within the full frequency range of the instrument.

SAM Broadcaster is an Internet radio broadcasting application by Spacial.

Yttrium iron garnet spheres (YIG spheres) serve as magnetically tunable filters and resonators for microwave frequencies.

In communications and electronic engineering, an intermediate frequency (IF) is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception.

In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, containing power as a result of the modulation process.

Airtime is a radio management application for remote broadcast automation (via web-based scheduler), and program exchange between radio stations.

Electronic filters are circuits which perform signal processing functions, specifically to remove unwanted frequency components from the signal, to enhance wanted ones, or both.

Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light.

A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power.

BBC Research & Development is the national technical research department of the BBC.

Klotz Digital AG was a manufacturer of audio media products based in Munich, Germany.

WICE-LP is a low-power F.

The British Institution of Radio Engineers was a professional organization for radio engineers.

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.

In a conventional, analog two-way radio system, a standard radio has noise squelch or carrier squelch which allows a radio to receive all transmissions.

Selcall (selective calling) is a type of squelch protocol used in radio communications systems, in which transmissions include a brief burst of sequential audio tones.

A personal radio service is any system that allows individual to operate radio transmitters and receivers for personal purposes with minimal or no special license or individual authorization.

Nautel Ltd. is a Canadian manufacturer of AM, FM and digital TV broadcast transmitters, navigational radio beacons, Differential Global Positioning System (DGPS) transmitters, medium frequency (MF) telegraph and NAVTEX transmitters, and high frequency (HF) amplifiers for dielectric heating applications.

Radioplayer is a radio technology platform, owned by UK radio broadcasters and operated under licence in some other European countries.

goTenna (goTenna Inc.) is a Brooklyn, New York-based startup that designs and develops technologies for off-grid and decentralized communications.

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

OpenBroadcaster is a web-based, open source system to run community radio and television broadcast transmitters with a simple web interface.

Low-power broadcasting refers to a broadcast station operating at a low electrical power to a smaller service area than "full power" stations within the same region, but often distinguished from "micropower broadcasting" (more commonly "microbroadcasting") and broadcast translators.

Radio frequency (RF) is any of the electromagnetic wave frequencies that lie in the range extending from around 3 kHz to 300 GHz, which include those frequencies used for communications or radar signals.

The Hohe Salve is a well-known mountain located between Kufstein, Wörgl and Kitzbühel in the Austrian state of Tyrol.

C-RAN (Cloud-RAN), sometimes referred to as Centralized-RAN, is a proposed architecture for future cellular networks.

Campcaster is a free and open source radio management application for live broadcasting, remote broadcast automation (via web-based scheduler), and program exchange between radio stations.

Datacasting (data broadcasting) is the broadcasting of data over a wide area via radio waves.