The document provides a history of radio broadcasting, beginning with Marconi's invention of wireless telegraphy in the late 19th century. This led to further developments like Hertz's discovery of radio waves and Bell's telephone invention, bringing the world closer to radio broadcasting. The first official radio broadcast was in 1920 by station KDKA. Radio flourished in the 1920s as more stations emerged and broadcasting became more entertainment-focused. The Great Depression of the 1930s increased radio's popularity and new technologies like FM radio were introduced. Radio experienced its "golden age" from the mid-1930s to 1950 as local broadcasters focused on their own programming over networks.

2. World history of radio broadcasting
Wireless telegraph invention
Decisive role in the emergence of radio
broadcasting
Marconi
Marconi made ​the first wireless telegraph

3. World history of radio broadcasting
The first telegraph message transmission
Morse
through wired telegraphy
Hertz Discovered the presence of high-frequency
Bell Telephone invention (1875)
The likelihood of success of wireless
telegraphy Preview
The rapid development of wireless communication technology
Triode since the invention of the United States de-Foret (1906)

4. History of radio usage
Of the First World War, the military use of wireless communication
After the war the United States through a radio receiver for sale bangtaek
Presidential election broadcast the first official broadcast of KDKA broadcasters
From established broadcasters throughout the 1920s
Broadcast nature of the entertainment increase

5. History of radio usage
Financial difficulties faced by advertising introduced an operating approach
adopted
The Great Depression of the 1930s, the radio activation
By FM 1933 to Major Armstrong appeared
Radio's golden age from the mid-1930s until 1950,
Local broadcasters in the program itself, rather than a network
program in the 1960s are beginning to focus

6. Radio development process step
Stages of the wireless transmission
1920 birth of the first radio broadcaster
Step of broadcasting network
Provide to local broadcasters nationwide broadcast
with the advent of the radio network
Stages of local music and news
Reconfiguration was in the form of the music of non-
broadcast local news and information programs that
provide formatting
The era of digital technology

7. The history of radio broadcasting in Korea
* Broadcasting history, origin 5 set
JODK countries, First broadcast
Koihime transmitting station, Seogyo saenggim
U.S. military liberation, affective broadcast received - Koreans elected as
a director
HL callsign grant
Publications under the Government of the Republic of Korea to establish,
KBS entering