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electromagnetic waves
The first test of electromagnetic waves was preformed by David Edward Hughes. -
developing a system of communication
Guillermo Marconi built the first commercially successful wireless telegraphy system based on radio waves -
first radio program
the first radio program was aired to the ships at sea playing O holy night on the violin and a passage from the Bible. -
radio factory
Marconi opened the first radio factory at New street works in Chelmsford, England. -
radio news
The first radio news was broadcast. -
single side band
single side band and frequency modulation was invented by amateur radio operators. -
TV
The first Commercial television transmissions stated in Europe and North America. -
Regency company
Regency company introduced the first pocket radio (TR-1) -
colored TV
color television was broadcast commercially -
loran
the premier radio navigation system. -
GPS
lunch of Global Positioning System (GPS) -
personal computers
experimenters began to use personal computers with audio cards to process radio signals -
revenue
revenue from online streaming music radio was US$49 million
