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marconi sends first radio signal
some people belive that he wasnt the first person but he had good pr -
1906 lee de forest
(borrowed) the idea for the auditon tube from reginald fessenden -
vacum tube
signals could travel farther -
radio industtry started
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dawn of advertising 1922
weaf aired a 10 minute commercial or toll broadcast for an apartment complex charging 150$ -
call letters
w-east of the missippi river k-west of the missippi river frequnceies can be used by multiple stastions call letters identified those station -
frc
frc organized the licensing of transmitters assigned radio station frequencies ,call letter and power limits -
radio demise
tv makes apperance in the late 1930s as tvs popularity grew more advertisers switched to tv radio lost money and radio shows jumped ship tv will do to -
fm radio
fm radio -
golden era
1930s-1940 everyone listend to the radio war and the great depression people were broke radios were big and expensive -
am waves
am waves amplitude modulation am changes the height of the wave 535 khz 1605 -
fm waves
frenquency moovalation fm changes the distance between waves 88mhz 108 mhz 1,000 khz 1mhz -
music
people had few options to hear music jukeboxes record live in concert music on the filled a void
