| dbo:abstract |
Apex radio stations (also known as skyscraper and pinnacle) was the name commonly given to a short-lived group of United States broadcasting stations, which were used to evaluate transmitting on frequencies that were much higher than the ones used by standard amplitude modulation (AM) and shortwave stations. Their name came from the tall height of their transmitter antennas, which were needed because coverage was primarily limited to local line-of-sight distances. These stations were assigned to what at the time were described as "ultra-high shortwave" frequencies, between roughly 25 and 44 MHz. They employed amplitude modulation (AM) transmissions, although in most cases using a wider bandwidth than standard broadcast band AM stations, in order to provide high fidelity sound with less static and distortion. In 1937 the Federal Communications Commission (FCC) formally allocated an Apex station band, consisting of 75 transmitting frequencies running from 41.02 to 43.98 MHz. These stations were never given permission to operate commercially, although they were allowed to retransmit programming from standard AM stations. Most operated under experimental licenses, however this band was the first to include a formal "non-commercial educational" station classification. The FCC eventually concluded that frequency modulation (FM) transmissions were superior, and the Apex band was eliminated effective January 1, 1941, in order to make way for the creation of the original FM band, assigned to 42 to 50 MHz. (en) Apex war ein Frequenzband, das von Radiostationen in den Vereinigten Staaten in den 1930er- und 1940er-Jahren genutzt wurde. Das Band lag über den Frequenzen des regulären Mittel- und Kurzwellenbandes. Mit der Möglichkeit frequenzmodulierter Ausstrahlungen im UKW-Band verstummten schnell auch die Apex-Stationen. (de) |
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http://www.theradiohistorian.org/Apex/Apex1.htm https://jeff560.tripod.com/chronofm.html https://www.radioworld.com/news-and-business/a-detroit-apex-station-in-1936/328693 https://babel.hathitrust.org/cgi/pt%3Fid=mdp.39015080101259&view=1up&seq=382 https://worldradiohistory.com/Archive-BC-YB/1937/1937-BC-YB.pdf%23page=337 https://worldradiohistory.com/Archive-BC-YB/1938/1938-BC-YB-All.pdf%23page=294 https://licensing.fcc.gov/cgi-bin/prod/cdbs/forms/prod/getimportletter_exh.cgi%3Fimport_letter_id=87275 https://jeff560.tripod.com/1939apex.html https://jeff560.tripod.com/1942fmra.html https://jeff560.tripod.com/fm1.html https://web.archive.org/web/20060505061934/http:/www.michiguide.com/history/fmhistory/prehist.pdf https://web.archive.org/web/20160304065821/http:/www.somerset.net/arm/reprints/sarkes_tarzian.pdf |
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Apex war ein Frequenzband, das von Radiostationen in den Vereinigten Staaten in den 1930er- und 1940er-Jahren genutzt wurde. Das Band lag über den Frequenzen des regulären Mittel- und Kurzwellenbandes. Mit der Möglichkeit frequenzmodulierter Ausstrahlungen im UKW-Band verstummten schnell auch die Apex-Stationen. (de) Apex radio stations (also known as skyscraper and pinnacle) was the name commonly given to a short-lived group of United States broadcasting stations, which were used to evaluate transmitting on frequencies that were much higher than the ones used by standard amplitude modulation (AM) and shortwave stations. Their name came from the tall height of their transmitter antennas, which were needed because coverage was primarily limited to local line-of-sight distances. These stations were assigned to what at the time were described as "ultra-high shortwave" frequencies, between roughly 25 and 44 MHz. They employed amplitude modulation (AM) transmissions, although in most cases using a wider bandwidth than standard broadcast band AM stations, in order to provide high fidelity sound with less sta (en) |
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Apex (Frequenzband) (de) Apex (radio band) (en) |
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