A Short History of Radio Events
Radio continues to be a relevant form of mass communication and remains one of the few free services to anyone with a receiver.Image by Jose Pedro Santos
The first commercial radio broadcast in 1920, Westinghouse Electric and Manufacturing Company in Pittsburgh, under the call sign KDKA, broadcast the live returns of the Harding/Cox presidential election. Within just four years of the initial KDKA broadcast, 600 stations existed in the U.S. and radio’s rapid popularity contributed to our shared national identity by providing syndicated news, sports, and music.
Radio stations gradually phased out vinyl single and LP records in the mid 1980s and went to CDs. Huge turntables and tape recorders disappeared, replaced by smaller CD players.
Radio program formats differ by country, regulation, and markets. For instance, the U.S. Federal Communications Commission designates the 88 - 92 megahertz band in the U.S. for non profit or educational programming, with advertising prohibited.
Formats change in popularity as time passes and technology improves. Early radio equipment only allowed program material to be broadcast in real time, known as live broadcasting. As technology for sound recording improved, an increase of broadcasts programming used prerecorded material. Some stations now operate without direct human intervention by using entirely prerecorded material sequenced by computer control.
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In 1936, an experimental station authorized to Major Edwin H. Armstrong for experimental FM broadcasts at 40 kW power in Alpine, NJ, demonstrated FM radio technology to the FCC. In1937, The Federal Communications Commission issued its first AM construction permit. And in 1938, Mel Allen announced the first World Series broadcast on CBS radio and War of the Worlds aired and caused mass panic when many radio listeners believed it was real.
Year | Establishments | Standard Broadcast | Frequency Modulation | Independent Stations |
1927 | 681 | |||
1928 | 677 | |||
1929 | 606 | |||
1930 | 618 | |||
1931 | 612 | |||
1932 | 604 | |||
1933 | 598 | |||
1934 | 449 | 593 | ||
1935 | 569 | 623 | ||
1936 | 656 | |||
1937 | 629 | 704 | ||
1938 | 660 | 743 | ||
1939 | 705 | 778 | ||
1940 | 765 | 847 | 3 | |
1941 | 825 | 897 | 56 | 2 |
1942 | 862 | 925 | 50 | 5 |
1943 | 852 | 912 | 55 | 5 |
1944 | 885 | 924 | 60 | 4 |
1945 | 969 | 955 | 65 | 5 |
1946 | 1555 | 1215 | 258 | 8 |
1947 | 3551 | 1795 | 918 | 52 |
1948 | 3967 | 2084 | 1020 | 103 |
1949 | 4085 | 2006 | 865 | 104 |
1950 | 3098 | 2144 | 788 | 86 |
1951 | 3129 | 2281 | 703 | 66 |
1952 | 3132 | 2355 | 650 | 56 |
1953 | 3393 | 2458 | 630 | 116 |
1954 | 3749 | 2583 | 580 | 123 |
1955 | 3875 | 2734 | 522 | 124 |
1956 | 4048 | 2896 | 656 | 51 |
1957 | 4276 | 3079 | 665 | 67 |
1958 | 4542 | 3253 | 703 | 93 |
1959 | 4802 | 3377 | 816 | 165 |
In 1961, WGFM in Schenectady, New York was the first station to broadcast in stereo. The first Telstar satellite was launched into space in 62. And in 1967, President Lyndon B. Johnson signed the Public Broadcasting Act, creating the Corporation for Public Broadcasting.
Year | Establishments | Standard Broadcast | Frequency Modulation | Independent Stations |
1960 | 4218 | 3483 | 906 | 218 |
1961 | 5269 | 3602 | 1075 | 249 |
1962 | 5558 | 3745 | 1213 | 279 |
1963 | 5749 | 3860 | 1341 | 294 |
1964 | 4777 | 3976 | 1425 | 306 |
1965 | 4867 | 4025 | 1569 | 338 |
1966 | 5008 | 4075 | 1605 | 381 |
1967 | 5100 | 4135 | 1806 | 405 |
1968 | 5236 | 4203 | 2026 | 387 |
1969 | 5309 | 4264 | 2198 | 442 |
1970 | 5584 | 4288 | 2393 | 464 |
1971 | 5708 | 4324 | 2258 | 527 |
1972 | 5826 | 4422 | 2468 | 559 |
1973 | 5936 | 4434 | 2560 | 616 |
1974 | 6136 | 4467 | 2713 | 678 |
1975 | 6228 | 4488 | 2847 | 703 |
1976 | 6339 | 4525 | 2947 | 713 |
1977 | 6316 | 4474 | 3007 | 741 |
1978 | 6462 | 4577 | 3206 | 777 |
1979 | 5769 | 4634 | 3300 | 835 |
1980 | 5875 | 4598 | 3292 | 1156 |
1981 | 9451 | 4634 | 3349 | 1177 |
1982 | 9842 | 4668 | 3380 | 1255 |
1983 | 10092 | 4377 | 3527 | 1285 |
1984 | 10374 | 4754 | 3527 | 1348 |
1985 | 4718 | 3716 | ||
1986 | 10975 | 4863 | 3944 | 1509 |
1987 | 11207 | 3902 | 4041 | 1577 |
1988 | 11271 | 4932 | 4155 | 1621 |
1989 | 11907 | 4975 | 4269 | 1666 |
Image by Sonny Mauricio
In1993, The Commission specified a stereo standard for AM radio. President Bill Clinton signed the Telecommunications Act of 1996 into law. The Act sought to increase competition in the industry by lifting station ownership caps, easing rules applicable to broadcasters, and deregulating the license renewal process. The Creation of the Emergency Alert Service, a national public alert system, and auctions for the first two satellite based Digital Audio Radio Service licenses were in 1997. In 2000, the FCC created the Low Power FM (LPFM) radio service to provide highly local noncommercial educational broadcasts. In 2001, XM Satellite radio launches. In 2002, Sirius Satellite radio launches and HD radio In band On channel (IBOC) system, allowing hybrid digital/analog operations on an interim basis.
Year | Establishments | Standard Broadcast | Frequency Modulation | Independent Stations |
1990 | 10830 | 4987 | 4392 | 1438 |
1991 | 10830 | 4985 | 4570 | 1507 |
1992 | 11334 | 4961 | 4785 | 1588 |
1993 | 11577 | 4994 | 4971 | 1662 |
1994 | 11710 | 4913 | 5109 | 1715 |
1995 | 11987 | 4150 | 5730 | 1805 |
1996 | 12112 | 4857 | 5419 | 1850 |
1997 | 12227 | 4762 | 5542 | 1906 |
1998 | 12373 | 4793 | 5662 | 2000 |
1999 | 12615 | 4783 | 5766 | 2066 |
2000 | 12717 | 4685 | 5892 | 2140 |
2001 | 13120 | 4727 | 6051 | 2259 |
2002 | 13331 | 4804 | 6161 | 2354 |
2003 | 13563 | 4802 | 6207 | 2552 |
2004 | 13525 | 4770 | 6217 | 2533 |
2005 | 13660 | 4758 | 6215 | 2672 |
2006 | 13837 | 4754 | 6266 | 2817 |
2007 | 13939 | 4776 | 6309 | 2892 |
2008 | 13997 | 4786 | 6427 | 3040 |
2009 | 14253 | 4798 | 6479 | 3151 |
2010 | 14420 | 4782 | 6526 | 3311 |
2011 | 14952 | 4766 | 6542 | 3644 |
2012 | 15128 | 4745 | 6580 | 3803 |
2013 | 15358 | 4728 | 6613 | 3989 |
2014 | 15432 | 4705 | 6652 | 4075 |
2015 | 26471 | 4702 | 6659 | 4081 |
2016 | 17007 | 4680 | 6715 | 4096 |
2017 | 17456 | 4666 | 6754 | 4112 |
2018 | 17649 | 4633 | 6741 | 4125 |
2019 | 17685 | 4613 | 6762 | 4139 |
2020 | 17637 | 4546 | 6704 | 4196 |
For more information:
Vinyl’s much-hyped return to radio
Celebrating 100 Years of Commercial Radio
Radio broadcasting
Amateur radio
International Amateur Radio Union
The International Amateur Radio Union or IARU, is an international confederation of national organisations that allows a forum for common matters of concern to amateur radio operators worldwide. The IARU was founded in 1925 and as of July 2021, it is composed of 172 national member societies. About 830,000 amateur radio stations are located in IARU Region 2, the Americas, followed by IARU Region 3, South and East Asia and the Pacific Ocean, with about 750,000 stations. A significantly smaller number, about 400,000, are located in IARU Region 1, Europe, Middle East, CIS, Africa.
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