On August 31, 1920 the first radio news program was broadcast by station 8MK in Detroit, Michigan. The station, owned by The Detroit News newspaper, which was owned by E.W. Scripps, had begun broadcasting less than two weeks earlier, on August 20. It was the first radio station owned by a newspaper, started by the Scripps family as an ...

On the air for over a century, WWJ began daily broadcasts as the "Detroit News Radiophone" on August 20, 1920, while it operated under an amateur radio license with the call sign "8MK". Over the years the station has claimed the titles of "America's Pioneer Broadcasting Station" [6] and where "commercial radio broadcasting began." [7]

That evening, at 8:10pm, 8MK broadcast the returns from one of Michigan’s primary elections that had taken place that day, firmly establishing it as the world’s first radio news program. The...

(Friday, August 20, 1920) — The first commercial radio station in the United States, 8MK, began operations today in Detroit. It was owned by William E. Scripps, owner of The Detroit News, and operated from the second floor of the Detroit News building.

Although the Detroit News introduced its new broadcast service to its readers on August 31, 1920, the newspaper had begun test transmissions, working with local amateur radio enthusiasts, on August 20th, thus the reports of reception prior to the station's August 31st public debut. 8MK's operating wavelength of 200 meters -- which was the ...

2020年9月11日 · Detroit News station WWJ began test broadcasts on Aug. 20, 1920 using call sign 8MK. A phonograph horn attached to the transmitter’s microphone is seen picking up recorded music on a borrowed Edison phonograph.

2020年4月21日 · 24年后的1888年，德国物理学家海因里希·鲁道夫·赫兹得出结论，电磁波可以在空中传播，从而证实了麦克斯韦的电磁学理论。 如今，频率单位或每秒的周期数在赫兹之后被称为“赫兹”，通常缩写为“ Hz”。 1888年之后，许多科学家撰写了有关使用机载赫兹或无线电波来传输信息的文章，但是直到1894年，意大利发明家Guglielmo Marconi才构建了第一个成功的无线电报系统。 马可尼于1874年出生于意大利的一个贵族家庭。 他的母亲是爱尔兰人，是约翰·詹姆森的 …

2017年2月11日 · As a member of the wwPDB, the RCSB PDB curates and annotates PDB data according to agreed upon standards. The RCSB PDB also provides a variety of tools and resources. Users can perform simple and advanced searches based on annotations relating to sequence, structure and function. These molecules are visualized, downloaded, and analyzed by users who range from students to specialized scientists.

2011年6月3日 · 大齿轮等级为9-9-8Mk；小齿轮等级为9-9-8Hk 请问阿拉伯数字和字母各代表啥含义，谢谢指点！！！

Michael D. Lyons, a prominent local area amateur radio operator, was hired by the Detroit News to work on the initial construction of the "Detroit News Radiophone", 8MK, which began testing on August 20, 1920 from the Detroit News' building at Lafayette and 2nd Avenues.