History of radioHistory of radio

Rasmus Laan Rasmus Laan 10.a10.a

• Electricity and magnetsim can Electricity and magnetsim can cause radio waves – Heinrich Hertzcause radio waves – Heinrich Hertz

• In 1905 a continuous wave voice In 1905 a continuous wave voice transmitter was inventedtransmitter was invented

• First coast-to-coast radio First coast-to-coast radio transmissions were sent out in transmissions were sent out in 19151915

• The ´´father of radio´´ is awarded to The ´´father of radio´´ is awarded to Lee De ForestLee De Forest

The first radio programsThe first radio programs

• In 1912 Charles Herrold began to In 1912 Charles Herrold began to broadcast in San Josebroadcast in San Jose

• Frank Conrad broadcasted music Frank Conrad broadcasted music from his garagefrom his garage

http://www.rchrd.com/blog/images/1915mwt.jpg

What to we get from the What to we get from the radio?radio?

• NewsNews

• InterviewsInterviews

• Talk showsTalk shows

• MusicMusic

• Birthday congratulationsBirthday congratulations

• Etc.Etc.

Radio todayRadio today

• Over 44 000 radio stations Over 44 000 radio stations

• Milliards of radiosMilliards of radios

Thank you all for your Thank you all for your attention!attention!

• http://en.wikipedia.org/wiki/http://en.wikipedia.org/wiki/History_of_radioHistory_of_radio

• http://history.sandiego.edu/GEN/http://history.sandiego.edu/GEN/recording/radio2.htmlrecording/radio2.html

• http://history.sandiego.edu/GEN/http://history.sandiego.edu/GEN/recording/radio.htmlrecording/radio.html

• http://radio.about.com/cs/http://radio.about.com/cs/funradiothings/f/radiofaq2.htmfunradiothings/f/radiofaq2.htm