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- Apex_(radio_band) abstract "Apex was an experimental radio broadcasting system introduced in the United States in 1934 that used high frequencies between roughly 25 and 42 MHz and wideband AM modulation (as opposed to traditional AM broadcasting's narrowband modulation) to achieve high fidelity sound with less static and distortion than medium wave AM stations in the so-called standard broadcast band (then, 545-1505 kHz) experience. They were called \"apex\", \"skyscraper\" or \"pinnacle\" stations because of the height of the broadcast antennas used.The Federal Communications Commission thought initially that very high frequency (VHF) radio waves would have a small, discrete range, and would allow two or more stations to broadcast on duplicate frequencies without interfering with each other. But later it was realized that during peaks in the 11-year sunspot cycle even VHF radio waves could reflect from the ionosphere, and Apex station signals could sometimes be heard on the other side of the planet. In October 1937, the FCC made public its allocation plan for VHF radio broadcasting: 75 channels with 40 kHz separation on 41.02 to 43.98 MHz for Apex stations and 16 channels in 30-40 MHz for relay stations. Twenty-five of the 75 channels were reallocated for educational use in 1938.Until the late 1930s, commercially made radio receivers did not operate within that band of frequencies, so early listeners to Apex stations used self-built receivers, or built converters for existing models.Most Apex stations operated under experimental licenses, and were affiliated with and subsidized by commercially licensed stations. In 1934, Buffalo, New York's W8XH, WBEN's ultra short wave station, became the first 5-meter station to air a regular schedule. It is a direct predecessor of current Buffalo FM adult contemporary station WTSS. In 1936, Milwaukee's W9XAZ (a service of The Milwaukee Journal's WTMJ (AM), which eventually became current day FM station WKTI-FM at 94.5) became the first Apex station to originate its own programming on a regular basis. By 1939, Apex stations were operating in 34 cities in 22 states. Apex radio broadcasting's goal of high fidelity sound was later realized by frequency modulation (FM), which operated at 42–50 MHz (later 88–106 MHz, 88–108 MHz later still, and currently 87.8–108 MHz), immediately above the Apex band of frequencies. The FCC in 1939 began encouraging Apex stations broadcasting in AM to consider the change to the technically superior FM system.The former Apex band is, as of 2012, allocated to land mobile communications.".
- Apex_(radio_band) wikiPageExternalLink 1939apex.html.
- Apex_(radio_band) wikiPageExternalLink 1942fmra.html.
- Apex_(radio_band) wikiPageExternalLink chronofm.html.
- Apex_(radio_band) wikiPageExternalLink fm1.html.
- Apex_(radio_band) wikiPageExternalLink prehist.pdf.
- Apex_(radio_band) wikiPageID "4436145".
- Apex_(radio_band) wikiPageLength "3938".
- Apex_(radio_band) wikiPageOutDegree "29".
- Apex_(radio_band) wikiPageRevisionID "707566011".
- Apex_(radio_band) wikiPageWikiLink AM_broadcasting.
- Apex_(radio_band) wikiPageWikiLink Amplitude_modulation.
- Apex_(radio_band) wikiPageWikiLink Antenna_(radio).
- Apex_(radio_band) wikiPageWikiLink Buffalo,_New_York.
- Apex_(radio_band) wikiPageWikiLink Category:1930s_in_the_United_States.
- Apex_(radio_band) wikiPageWikiLink Category:1934_introductions.
- Apex_(radio_band) wikiPageWikiLink Category:Bandplans.
- Apex_(radio_band) wikiPageWikiLink Category:Broadcast_engineering.
- Apex_(radio_band) wikiPageWikiLink Category:History_of_radio.
- Apex_(radio_band) wikiPageWikiLink Category:Radio_in_the_United_States.
- Apex_(radio_band) wikiPageWikiLink Category:Radio_technology.
- Apex_(radio_band) wikiPageWikiLink FM_broadcasting.
- Apex_(radio_band) wikiPageWikiLink Federal_Communications_Commission.
- Apex_(radio_band) wikiPageWikiLink Frequency.
- Apex_(radio_band) wikiPageWikiLink Frequency_modulation.
- Apex_(radio_band) wikiPageWikiLink Hertz.
- Apex_(radio_band) wikiPageWikiLink Ionosphere.
- Apex_(radio_band) wikiPageWikiLink Microwave_transmission.
- Apex_(radio_band) wikiPageWikiLink Milwaukee.
- Apex_(radio_band) wikiPageWikiLink Milwaukee_Journal_Sentinel.
- Apex_(radio_band) wikiPageWikiLink Radio_broadcasting.
- Apex_(radio_band) wikiPageWikiLink Solar_cycle.
- Apex_(radio_band) wikiPageWikiLink Very_high_frequency.
- Apex_(radio_band) wikiPageWikiLink WBEN_(AM).
- Apex_(radio_band) wikiPageWikiLink WKTI.
- Apex_(radio_band) wikiPageWikiLink WTMJ_(AM).
- Apex_(radio_band) wikiPageWikiLink WTSS.
- Apex_(radio_band) wikiPageWikiLinkText "Apex (radio band)".
- Apex_(radio_band) wikiPageWikiLinkText "Apex band".
- Apex_(radio_band) wikiPageWikiLinkText "Apex".
- Apex_(radio_band) wikiPageWikiLinkText "Ultra-shortwave".
- Apex_(radio_band) wikiPageWikiLinkText "apex broadcasters".
- Apex_(radio_band) wikiPageWikiLinkText "apex".
- Apex_(radio_band) wikiPageWikiLinkText "ultra-shortwave radio".
- Apex_(radio_band) wikiPageWikiLinkText "ultra-shortwave".
- Apex_(radio_band) wikiPageUsesTemplate Template:Refimprove.
- Apex_(radio_band) wikiPageUsesTemplate Template:Reflist.
- Apex_(radio_band) subject Category:1930s_in_the_United_States.
- Apex_(radio_band) subject Category:1934_introductions.
- Apex_(radio_band) subject Category:Bandplans.
- Apex_(radio_band) subject Category:Broadcast_engineering.
- Apex_(radio_band) subject Category:History_of_radio.
- Apex_(radio_band) subject Category:Radio_in_the_United_States.
- Apex_(radio_band) subject Category:Radio_technology.
- Apex_(radio_band) hypernym System.
- Apex_(radio_band) comment "Apex was an experimental radio broadcasting system introduced in the United States in 1934 that used high frequencies between roughly 25 and 42 MHz and wideband AM modulation (as opposed to traditional AM broadcasting's narrowband modulation) to achieve high fidelity sound with less static and distortion than medium wave AM stations in the so-called standard broadcast band (then, 545-1505 kHz) experience.".
- Apex_(radio_band) label "Apex (radio band)".
- Apex_(radio_band) sameAs Q4779411.
- Apex_(radio_band) sameAs m.0c28hb.
- Apex_(radio_band) sameAs Q4779411.
- Apex_(radio_band) wasDerivedFrom Apex_(radio_band)?oldid=707566011.
- Apex_(radio_band) isPrimaryTopicOf Apex_(radio_band).