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Transcript of Radio
In 1895, Guglielmo Marconi successfully sent and received the first radio signal
In 1902, Marconi completed the first transatlantic radio telegraph message
At the start of World War I, the United States government controlled all radio
Radio Corporation of America was founded after the war
One year later KDKA broadcasted the first news program In August of 1922, the first advertisement aired in New York City for a real estate developer
Radio Corporation of America created National Broadcasting Company NBC's first broadcast was the Rose Bowl game in Pasadena, California
Columbia Broadcasting system was created to compete with NBC CBS broadcasted a Halloween episode of Mercury Theatre on the Air
Orson Welles' adaptation of the War of the Worlds was included in the episode Listeners believed
that a real
was occurring TIME LINE The beginning 1954 1963 1984 1987 1994 1996 1999 2003 2004 2008 Current First pocket transistor (TR1)
Over 100,000 sales Telstar launched in space
First radio communication satellite Radio Data System (RDS)
Allowed data to be stored like song title and artist RDS included into cars WXYC successfully broadcasted
radio over the internet sonicwave.com was
the first internet radio
station Sirus XM satellite
radio is found Internet radio valued
at $49 million Pod casting introduced Internet radio valued
at $500 million Technology The radio uses "radio waves"
Radio waves are a part of the electromagnetic spectrum
Other components of the spectrum include Gamma Rays
Infrared Radios use sine waves to transmit data
radios use multiple frequencies Radio parts Transmitter
Antennas Radio Characteristics
Number of frequencies
Transmitter power Frequency Oscillation Modulation Number of times a wave oscillates per second Oscillations are measure in"cycles per second" or "hertz"
"Kilohertz" AM radio
"Megahertz" FM radio The variation of a property of an electromagnetic wave or signal, such as its amplitude, frequency, or phase.
Amplitude Modulation (AM)
Frequency Modulation (FM) Radio waves are not just useful for AM and FM radio, they are also used for other world applications
Morse code (especially useful during WWI)
Television (sends picture as AM and sound as AM or FM)
Radar- Sends out radio waves that bounce off object to detect them
Heating- such as microwaves
Radio Control (RC)- for controlling devices such as toys, work equipment, weapons, etc.
Advertising How does a radio station make money? They sell air time
The host can endorse a product or company
They can sell ad-free radio to internet users History of radio ads First commercial over the radio by KDKA 1919 Radio stations started to broadcast
commercials more continuously 1920 1922 AT&T started selling airtime
WEAF was the first to buy it In 1920 Amateur radio stations
sold airtime to support their work WEAF though not the first to technically buy airtime they have the credit for buying it first 95% of people still listen to the radio every week Demographics Over 13,000 radio stations
Goal is to reach the right people at the right time with the right message with the right cost Today Entertainment radio
Different radio programs
Community Online radio
Grooveshark Satellite radio
An analogue or digital radio signal that is relayed through one or more satellites.
Used for two things mainly: GPS and High quality radio GPS systems
Garmin, TomTom, Magellan
Satellite radio companies
Rhapsody, Sirus XM
Satellite radios are better formatted than AM/FM Communication radio
Still used in fire stations, airports, train/bus stations, police stations, and shipping.
Types of radio communication
WIFI A presentation by:
Alexx Bravo Sources:
Satellite radio - Wikipedia, the free encyclopediahttp://www.google.com/url?sa=t&rct=j&q=satellite%20radio&source=web&cd=3&cad=rja&ved=0CDQQFjAC&url=http%3A%2F%2Fen.wikipedia.org%2Fwiki%2FSatellite_radio&ei=NPxoUIatLcm60QGS1oDACQ&usg=AFQjCNEqQ5LMww4bh1048czyFR9nxMkP8g&sig2=DRHzgWATIoSYXfjeM3za_w
Radio - Wikipedia, the free encyclopedia
Wireless - Wikipedia, the free encyclopedia
How To Use Radio Communication Procedures