1998 32¢ Celebrate the Century - 1920s: Radio-America stamp
US #3184i – By 1922 there were 30 commercial stations and by 1923 there 556.  Today there are over 15,000.

On August 20, 1920, Detroit’s 8MK radio station began daily broadcasts.  Still in operation today, the station often claims to be the first commercial radio station, though a few others have also staked their claim on that title.

The evolution of radio technology spanned decades with contributions from several inventors.  Guglielmo Marconi is often credited as the inventor of radio, and won the 1909 Nobel Prize in Physics with Karl Ferdinand Braun “in recognition of their contributions to the development of wireless telegraphy.”

1964 5¢ Amateur Radio stamp
US #1260 – 8MK initially operated under an amateur radio license.

William E. Scripps is often credited with the creation of Detroit’s 8MK radio station.  His family ran the Detroit News and had long been interested in the advancements in radio technology.  In 1919, Scripps and Thomas E. Clark proposed the creation of a radio station that could broadcast throughout the Great Lakes region.  In early 1920, they gained the support of Lee de Forest, a radio pioneer whose Audion vacuum tube made radio broadcasting possible.  The station received an amateur radio license and adopted the call sign 8MK.  Their early broadcasts were called the “Detroit News Radiophone.”

8MK began its nightly broadcasts on August 20, 1920, though these were largely test programs only heard by local amateur radio enthusiasts.  Then on August 31, the Detroit News print an announcement on its front page that nightly radio broadcasts would begin that night.  The news that night, which ran from 8 to 9 p.m., announced the returns from a primary election as well as vocal performances by Lois Johnson.  The next day, the paper reported, “The sending of the election returns by The Detroit News Radiophone Tuesday night was fraught with romance and must go down in the history of man’s conquest of the elements as a gigantic step in his progress.”

1973 6¢ Progress in Electronics: Marconi's Spark Coil and Gap stamp
US #1500 pictures Guglielmo Marconi’s spark coil and spark gap, which enabled him to transmit across the Atlantic Ocean by wireless radio.

Over the next few months, 8MK offered daily broadcasts that often included phonograph recordings with news announcements.  They also reported on the heavyweight championship bout between Jack Dempsey and Billy Miske as well as the 1920 World Series.  In September they began weekly vocal concerts and on November 2, they reported on the results of that year’s presidential election.  8MK later changed its call sign to WBL and later WWJ, which it remains today.  WWJ considers itself “America’s Pioneer Broadcasting Station” and where “commercial radio broadcasting began.”

1973 15¢ Progress in Audio & Visual Electronics stamp
US #1502 pictures Emile Berliner’s microphone Thomas Edison’ vacuum tube, and Vladimir Zworykin’s photoelectric cell.

On November 2, 1920, KDKA in Pittsburgh, Pennsylvania had its inaugural broadcast, also sharing the results of the presidential election.  KDKA received its license in October 1920 and is often considered the first US licensed commercial broadcasting station.  They would begin daily broadcasts in 1921.  The station’s engineer, Frank Conrad, had been broadcasting from the call signs 8XK and 8YK since 1916.  KDKA was the first of several radio stations already in existence to receive a limited commercial license and is still in operation in Pittsburgh today.

1973 8¢ Progress in Electronics: Transistors and Printed Circuit stamp
US #1501 pictures the transistor, which made miniaturization possible and opened the door for production of pocket radios and computer parts.

9XM at the University of Wisconsin was another early station.  It received an experimental license in 1914 and began transmitting Morse code in 1916.  It first broadcast music in 1917 and began regularly scheduled news and music broadcasts in 1921.  The station is still in operation today as WHA.

1973 11¢ Electronics Progress de Forest Audion stamp
US #C86 pictures de Forest’s Audion vacuum tube, “a device for amplifying feeble electric currents.”

Springfield, Massachusetts’s WBZ got its commercial license on September 15, 1921, and Newark, New Jersey’s WJZ got its license on November 7.  However, these stations changed cities, while KDKA and 8MK have remained in the same cities throughout their existence.   There were also a few other experimental radio stations that began operating as early as 1917, but they didn’t get their commercial licenses until 1922.

FREE printable This Day in History album pages
Download a PDF of today’s article.
Get a binder or other supplies to create your This Day in History album.

Discover what else happened on This Day in History.

Did you like this article? Click here to rate:
Share this Article

One Comment

  1. Amazing to think that less than 100 years ago, the average household did not have access to radio. I feel a little spoiled. Stamps help tell the story of our history. I hope we can use the next generation to tell the story.

    Maybe a widespread grades school promotion, where “seed stamps” are give to kids, along with a 5 page album will get them off of the phones !!

Leave a Reply

Your email address will not be published. Required fields are marked *