The following outline is provided as an overview of and topical guide to radio:
Radio – transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. Information is carried by systematically changing (modulating) some property of the radiated waves, such as amplitude, frequency, phase, or pulse width. When radio waves pass an electrical conductor, the oscillating fields induce an alternating current in the conductor. This can be detected and transformed into sound or other signals that carry information.
Essence of radio
Radio
Broadcasting
Wireless
Radio broadcasting
Applications
Amateur radio
Direction finding
Radio broadcasting
AM broadcasting
FM broadcasting
Shortwave broadcasting
Radar
Radio astronomy
Radio navigation
Radiotelephone
Software-defined radio
Two-way radio (Aviation, Land-based commercial, Government, Marine) Mission critical communication TETRA and P25 Wireless power transfer
Types of radio broadcasting
Campus radio
Commercial radio
Community radio
International broadcasting
Internet radio
Music radio
Pirate radio
Public radio
Radio broadcasting topics
Disc jockey
Radio documentary
Radio format
Radio personality
Radio programming
History of radio
History of radio
Invention of radio
Wireless telegraphy
Spark-gap transmitter
Alexanderson alternator
Antique radio
Coherer
Continuous wave
Crystal radio
Vacuum tube
Amplitude modulation
Old-time radio
Radioteletype
Table of years in radio (events by year) Timeline of radio
Radio science
Radio science
Antenna (radio) Carrier current Electromagnetic radiation Radio frequency (electricity and electromagnetic waves) Radio spectrum (electromagnetic waves) Radio propagation Receiver (radio) Transmitter Types of radio emissions
Radio technology
Antenna matching unit
Batteryless radio
Digital radio
Preselector
Radio frequency power amplifier
Radio software
Superheterodyne receiver
Tuner (radio)
Radio stations
Radio stations in Africa
Radio stations in Asia
Radio stations in Australia
Radio stations in Europe
Radio stations in North America
Radio stations in South America
Radio stations in the South Pacific and Oceania
Persons influential in the field of radio
Michael Faraday (predictions) James Clerk Maxwell (theoretical work) Heinrich Rudolf Hertz (experimental demonstrations) Oliver Lodge (techniques for transmitting and receiving radio waves) Guglielmo Marconi (adapted radio waves for use in signalling) Reginald Fessenden (developed amplitude modulation (AM) radio and first voice transmission) Edwin Howard Armstrong (developed frequency modulation (FM) )
Alternatives
Cable FM
Free-space optical communication (FSO) Internet radio