About The Ra-dio

│Introduction to communication │2012-10-03

20082563 Hwang Bo ram

The history and origin of radio is as interesting as the medium itself. The journey of the invention of radio

started with the discovery of radio waves or the electro-magnetic waves, which transmit music, pictures,

speech and other data, via the medium of air. However, radio is also closely related with other technologies, like telegraphy and telephone, as the initial radio operated

on the principle of ‘wireless telegraphy’.

The Ra-dio ?

Invention of Radio

“ ”Invention of Radio - Guglielmo Marconi

Who is Mar-coni

?

Guglielmo Marconi was an

Italian inventor, known as the

father of long distance radio

transmission and for his de-

velopment of Marconi's law

and a radio telegraph system.

Guglielmo Marconi

<Titanic events have demonstrated the power of wireless teleg-raphy>1912.Was a huge accident occurs. Luxury cruise ship Titanic hit an iceberg

and sank.Due to accidents, 1,526 of the 2,239 people aboard who lost their lives at sea in the Arctic.The reason the rest of this structure was that Mar-coni invented wireless telegraphy. Titanic architect shortly before the ship

sank through the wireless telegraphy was near the ship bumped SOS quickly on the scene to hear the signal arrived. At the time, the media said.

"Marconi's knowledge as a scientist and inventor as genius has saved lives of the survivors of the Titanic should be remembered."

Guglielmo Marconi

During the 1890s,

In addition to Marconi, Nikola Tesla and several others developed radio-con-ductors, transmitters, and receivers, mak-ing it possible to send Morse code mes-sages across long distances without the physical limitations of wires, cables, or poles. This led to the terms wireless or radio-telegraphy. Telegrams sent across the wireless were radio-grams, or "radios" for short.

Development of Radio

Development of Radio

Radio can refer to either the electronic appliance that we listen with or the content listened to. However, it all started with the discovery of "radio waves" - elec-tromagnetic waves that have the capacity to transmit music, speech, pictures and other data invisibly through the air. Many devices work by using elec-tromagnetic waves including: radio, microwaves, cordless phones, remote controlled toys, television broadcasts, and more.

“

”

Following this, the most popular radio technology

was discovered, the FM radio. The credit for inventing the frequency modulated radio goes to Edwin Howard Armstrong in 1933. The specialty of FM was that it im-proved the quality of audio signals drastically. The noise caused by electrical equipment and the earth's atmosphere could now be easily controlled and re-duced. In 1947, Bell Labs invented the transistor, while Sony, a Japanese company, introduced the transistor radio in 1954.

The FM Radio

Various Radio

<Korea’s First ‘FM Radio’> <GUM-SUNG Radio ‘RM-715’>

Since then, radio has not looked back and has be-come one of the popular mediums of portable enter-

tainment. In the 21st century, technological devel-opments have introduced concepts like internet ra-

dio, thereby broadening the horizon. Satellite radio is yet another latest development in the field, via which

you can listen to numerous international radio channels anywhere.

NOW ?

Current Radio Status

http://blog.naver.com/ghcl2233

Reference Site

http://en.wikipedia.org/wiki/Guglielmo_Marconi

http://inventors.about.com/od/rstartinven-tions/a/radio.htm