Timeline of Radio

In 1988 Heinrich Hertz detected and produced radio waves.
In 1894 Marchese Guglielmo Marconi built his first radio equipment.
Marconi established the first radio link between England and France in 1899.
An American scientist called R.A. Fessenden transmitted human speech via radiowaves in 1900.
In 1901 Marconi transmited telegraphic radio messages from Cornwall to Newfoundland.

Valdemar Poulsen patents an arc transmission that generates continuous radio waves, producing a frequency of 100 kHz and receivable over 150 miles in 1903.
In 1904 First radio transmission of music at Graz, Austria.
1905,Marconi invented the directional radio antennae.
In 1906 the first radio program of voice and music was broadcast in the U.S. (by R.A. Fessenden)
In 1907 Fessenden invents a high-frequency electric generator that produces radio waves with a frequency of 100 kHz.
GE develops a 100 kHz, 2 kW alternator for radio communication in 1908.
In 1910, radio communications gain publicity when the captain of the Montrose alerts Scotland via radio of an escaping criminal.
In 1913, the cascade-tuning radio receiver and the heterodyne receiver are introduced.
In 1914 Edwin Armstrong patents a radio receiver circuit with positive feedback. Part of the amplified high-frequency signal is fed back to the tuning circuit to enhance selectivity and sensitivity.
In 1918 Armstrong develops the superheterodyne radio receiver. The principle for this receiver is the basis for all radio receivers now in use.
A 200 kW alternator starts operating at Station NFF, the Naval station in New Brunswick NJ, which was the most powerful radio transmitter of the time.
Shortwave radio was developed and RCA was found in 1919.
In 1920 KDKA broadcasted the first regular licensed radio broadcast out of Pittsburgh, PA.
In 1921 RCA started operating Radio Central on Long Island.
The American Radio League established contact via a shortwave radio with Paul Godley in Scotland, proving that shortwave radio can be used for long distance communication.
March 1922 WWJ, an AM station in Detroit, offered the University of Michigan broadcasting rights for extension lectures.
In 1923 UM's Professor Dreese submited a proposal for several UM operated stations. His proposal was tabled by the Regents, who were not concerned with radio at the time.
In 1924 Dreese instead runned an experimental station WCBC as a project in the basement of West Engineering. This project died at the end of the academic year.
In 1925 WJR-AM offered educational broadcasting spots to the UM. The UM continued to broadcast on WWJ as well.
In 1928 a radio station in NYC, WRNY began to broadcast television shows.
In 1933 Educational programming originating at the UM grows.
The Regents of the UM became interested in radio.
WJR cuts the UM's educational broadcasts for commercial broadcasting.
Edward Armstrong patents wide-band frequency modulation (FM radio).
In 1935 FM radio is born, but only in mono.
In 1938 the FCC sets aside educational/non-profit bandwidth on FM.
In Oct 10, 1941 Columbia University's Radio Club opens the first regularly scheduled FM station.
In 1943The UM decides it needs an FM station, and expresses a commitment to radio broadcasting.
In 1945 Television is born. FM is moved from its original home of 42-50 Mhz to 88-108 Mhz to make room for TV.