A radio station is a sound broadcasting service. Traditionally, radio stations have broadcast through the air via radio waves (a form of electromagnetic radiation), free internet big country radio station radio station sent through a transmitter and antenna. Today, many if not most stations broadcast via cable FM, local wire networks, satellite, or the Internet as well as (or instead country radio station history first radio station of) atmospheric broadcasting. Stations radio station online listening free radio station online can be linked in radio networks to broadcast a common houston radio station starting a radio station program, either hip hop radio station online in syndication or simulcast, or both.
Broadcasting program material in real time is known as live broadcasting. As technology for sound recording improved, an increasing proportion of broadcast programming used pre-recorded material. A current trend is the automation of radio stations. online radio station Some stations now operate without direct human intervention by using entirely pre-recorded material sequenced by computer control.
Radio stations are of several types. The best known are the AM and FM stations, including both commercial and public or nonprofit varieties. Non-commercial college and university radio stations are found throughout the developed world.
The earliest radio stations were simply radio telegraph systems, and did not carry audio. The first known audio transmission that could be called a broadcast hip hop radio station websites occurred on Christmas Eve in 1906, and was made by Reginald Fessenden. While many early experimenters free radio station rap attempted to create systems similar to radiotelephone devices where only two parties were meant to communicate, there were others who intended to transmit to larger audiences. internet radio london radio station list station list in los angeles radio station list Charles Herrold started broadcasting in California in 1909 and was carrying audio by the next year.
For the next decade, radio tinkerers had to build their own radio receivers. KDKA AM of Pittsburgh, Pennsylvania (owned by Westinghouse) started broadcasting as the first "commercial" radio station on November 2, 1920. The commercial sense of internet radio station the london radio station radio station in spanish station came from the type of license—they didn't start airing radio radio station to listen to station finder advertisements until a few years later. The first broadcast was the results of the U.S. presidential radio station online election, first radio station 1920. free radio station Many historians base KDKA's free online radio station status as "first" on the fact that commercially-produced radio receivers weren't available radio station website until that radio station locator time. However, by that free galaxy radio station standard, many radio station directory radio station call letters radio station on the web believe starting your own radio station that other stations should count, as at least one smaller manufacturer with their own station was making radios by the time KDKA list of illinois radio classic gold radio station station was licensed.
AM stations were developed first. AM refers radio station playlists to amplitude modulation, a mode of broadcasting radio waves, and occurs local radio station websites on North American airwaves in the mediumwave frequency range of 530 to top 40 radio station 1700 kHz (known as 103 5 kiss fm chicago radio station the "standard broadcast band"). The band was expanded in the 1990s by adding nine channels from 1620 radio station promotions to 1700 kHz. Channels chicago radio station guide are radio station spaced every 10 kHz in the radio station guide irish radio station Americas, and generally every 9 kHz everywhere else. Europe also uses the longwave band.
FM refers to frequency modulation, and occurs on VHF airwaves everywhere (except Japan) in the frequency radio station ratings range of 88 to 108 MHz. Japan uses the 74 to 90 MHz band. FM stations are chicago area radio station much more popular in economically developed regions, such radio station websites as Europe and the United States, especially since the word 100.7 radio station in dallas higher sound fidelity and stereo broadcasting became common in this denver radio station listings format.
The digital radio stations are now emerging, first in Europe (the U.K. and Germany), and later in the United States. The European system is named DAB, for Digital Audio Broadcasting, and uses the public domain EUREKA 147 system. In the United radio station guides States, the IBOC system is named HD Radio and owned by a private company, a consortium called iBiquity. It is expected that for the next 10 to 20 years, all these systems will co-exist, while by radio station listings 2015 to 2020 digital radio may predominate, at least in the developed countries.
Many other non-broadcast types of radio stations exist. These include:
- base stations for police, fire and ambulance networks
- military base stations
- dispatch base stations for taxis, trucks, and couriers
- emergency broadcast systems
- amateur radio stations
See radio station list also
- History of broadcasting
- History of radio
- Television station
- List of radio stations
- International broadcasting
- Callsign (radio)
- Low power radio station
- Radio format
External Links
- In the United States, See FCC
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