Radio | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-01-08

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Radio


00:01:48 1 Etymology
00:06:44 2 Processes
00:07:08 2.1 Transmitter and modulation
00:09:44 2.2 Antenna
00:10:39 2.3 Propagation
00:11:38 2.4 Resonance
00:12:07 2.5 Receiver and demodulation
00:13:40 2.6 Radio band
00:14:21 3 Communication systems
00:16:34 4 History
00:20:24 5 Uses of radio
00:22:41 5.1 Audio
00:22:49 5.1.1 One-way
00:27:53 5.1.2 Two-way
00:30:19 5.2 Telephony
00:31:03 5.3 Video
00:32:37 5.4 Navigation
00:34:56 5.5 Radar
00:36:39 5.6 Data (digital radio)
00:41:09 5.7 Heating
00:41:38 5.8 Amateur radio service
00:42:42 5.9 Unlicensed radio services
00:44:02 5.10 Radio control (RC)
00:44:57 6 See also



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SUMMARY
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Radio is the technology of using radio waves to carry information, such as sound and images, by systematically modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.
Radio systems need a transmitter to modulate (change) some property of the energy produced to impress a signal on it, for example using amplitude modulation or angle modulation (which can be frequency modulation or phase modulation). Radio systems also need an antenna to convert electric currents into radio waves, and radio waves into an electric current. An antenna can be used for both transmitting and receiving. The electrical resonance of tuned circuits in radios allow individual frequencies to be selected. The electromagnetic wave is intercepted by a tuned receiving antenna. A radio receiver receives its input from an antenna and converts it into a form that is usable for the consumer, such as sound, pictures, digital data, measurement values, navigational positions, etc. Radio frequencies occupy the range from a 30 Hz to 300 GHz, although commercially important uses of radio use only a small part of this spectrum.A radio communication system requires a transmitter and a receiver, each having an antenna and appropriate terminal equipment such as a microphone at the transmitter and a loudspeaker at the receiver in the case of a voice-communication system.