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Heinrich Rudolf Hertz proved transmitted electromagnetic waves
After this discovery by Hertz, many scientists and inventors experimented with wireless transmission trying to develop a system of communication. -
Italian inventor Guglielmo Marconi built the first successful wireless telegraphy system
Marconi demonstrated application of radio in military and marine communications and started a company for the development of radio communication services and equipment. -
Brazilian priest Roberto Landell de Moura transmitted the human voice wirelessly
He received his first patent from the Brazilian government. Knowing that his invention had real value, he left Brazil for the United States with the intent of patenting the machine in the US. -
Marconi opened the world's first radio factory
In June 1912 Marconi opened the world's first purpose-built radio factory at New Street Works in Chelmsford, England -
The first radio news program was broadcast August 31, 1920
The first college radio station began broadcasting on October 14, 1920 from Union College, Schenectady, New York under the personal call letters of Wendell King, an African-American student at the school. -
Frequency modulation were invented by amateur radio operators
By the end of the 1930's, single sidebands and frequency modulation were established commercial modes. -
AT&T commercialized the Mobile Telephone Service
AT&T introduced Mobile Telephone Service to one hundred towns and highway corridors. Mobile Telephone Service was a rarity with only 5,000 customers placing about 30,000 calls each week. Because only three radio channels were available, only three customers in a city could make mobile telephone calls at one time -
Regency company introduces a pocket transistor radio
the TR-1, powered by a "standard 22.5 V Battery." The newly formed Sony company introduced its first transistorized radio. It was small enough to fit in a vest pocket, powered by a small battery. It was durable, because it had no vacuum tubes to burn out. -
Color television was being broadcasted
Color television was being broadcast commercially, not all broadcasts or programs were in color. -
LORAN becomes the premier radio system.
In the 1970s, LORAN became the premier radio navigation system. -
U.S. Navy experimented with satellite navigation
The U.S. Navy experimented with satellite navigation, culminating in the launch of the Global Positioning System (GPS) constellation in 1987. -
Amateur radio experimenters began to use personal computers
In the early 1990s, amateur radio experimenters began to use personal computers with audio cards to process radio signals. The U.S. Army launched a project to construct a software-defined radio that can be programmed to be virtually any radio by changing its software program. -
Most Internet Radio Stations increased their stream quality
Most Internet Radio Stations increased their stream quality as bandwidth became more economical. Most stations stream near CD quality audio.
