-
It is likely that the first intentional transmission of a signal by means of electromagnetic waves was performed in an experiment to make the radio by David Edward Hughes around 1880.
-
In 1894 started several years of experiments performed by the Italian, Guglielmo Marconi, these experiments lead to the invention of the first complete, commercially successful wireless telegraphy system based on airborne Hertzian waves (radio transmission).
-
In 1900, the Brazilian priest Roberto Landell de Moura transmitted the human voice wirelessly about half a mile away. This was the first time that anyone had done that.
-
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 broadcasted on August 31, 1920 by station 8mk in Detroit, Michigan.
-
In the early 1930s, single sideband and frequency modulation were invented by amateur radio operators. By the end of the decade , they were established commercial modes.
-
Commercial televison transmissions started in North America and Europe in the 1940s. One example of this is in 1947, AT&T commercialized the mobile telephone service.
-
In 1954, the Regency company introduced a pocket transistor radio, the TR-1, powered by a "Standard 22.5 V Battery".
-
The U.S. long-distance telephone network began to convert to a digital network in the late 1960s, employing digital radios for many of it's links.
-
In the 1970s, LORAN became the premier radio navigation system.
-
In 1987, the U.S. Navy experimented with satellite navigation, culminating the launch of the Global Positioning System (GPS)
-
The U.S. Army and DARPA launched an aggressive, successful project to construct a software-defined radio that can be programmed to be virtually any radio by changing its software program in 1994.
-
In 2003, revenue for online radio was $49 million, then it grew to $560 million in 2006.
