DBpedia – Linked Data Fragments

Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/NSS_Annapolis> ?p ?o }

• NSS_Annapolis abstract "NSS Annapolis, officially known as Naval Communications Station Washington, D.C. Transmitter or NavCommStaWashingtonDC(T), was a Very Low Frequency (VLF) and High Frequency (HF) transmitter station operated by the United States Navy.It was located at Greenbury Point, in Anne Arundel County, across the Severn River from Annapolis, Maryland at coordinates 38°58′40″N 76°27′12″W. NSS Annapolis was used by the USN for submarine communication. The station consisted of an umbrella antenna supported by a 1,200-foot (365.76 m) high central mast, which was insulated against ground, 6 guyed masts of 800-foot (243.84 m) and 3 freestanding towers of the same height.The huge towers were a local landmark, and served as a visual reporting point for aircraft landing at the nearby Baltimore-Washington International (BWI) airport. A golf course ran through the VLF antenna farm; special rules addressed hitting a tower with a ball (usually stroke and distance). The NSS HF receiver station, and the headquarters for NavCommStaWashingtonDC(T), was located at the Naval Communications Station in Cheltenham, Maryland until 1969. In late 1969, the receiver station at Cheltenham closed and a new receiver station was activated at Sugar Grove, West Virginia.NSS began transmitting in September, 1918 using 500 kilowatt Poulson Arc transmitters. However, arc transmitters were significantly inferior to the then state-of-the-art Alexanderson alternator and the arc transmitters were replaced by more modern vacuum tube transmitters in 1931. VLF, or \"longwave\" radio was the standard at the time for long range radio transmission, later to be generally replaced by shortwave. VLF later became essential for communicating with submerged submarines, a critically important capability as submarines became strategic missile platforms. The NSS transmitter fed one million watts of radio energy to its antenna, and during idle times, transmitted the string \"W W W VVV VVV VVV DE NSS NSS NSS\" in Morse code. The power was so high and the frequency so low, one could hear the signal on practically any kind of receiver anywhere in the Annapolis area. Messages were also sent in Morse code, but were either prearranged code signals or were encrypted.Rendered obsolete by satellite technology and the end of the cold war, NSS ceased operation and most of all of the antennas and most of the towers were demolished in 1999. Only three of the smaller towers were preserved for historic reasons.".
• NSS_Annapolis thumbnail NSS_Annapolis_Towers.JPG?width=300.
• NSS_Annapolis wikiPageExternalLink nss.shtml.
• NSS_Annapolis wikiPageExternalLink 1963h202.jpg.
• NSS_Annapolis wikiPageExternalLink 20sec5.
• NSS_Annapolis wikiPageExternalLink goliath.jpg.
• NSS_Annapolis wikiPageID "1643618".
• NSS_Annapolis wikiPageLength "3534".
• NSS_Annapolis wikiPageOutDegree "20".
• NSS_Annapolis wikiPageRevisionID "707784605".
• NSS_Annapolis wikiPageWikiLink Alexanderson_alternator.
• NSS_Annapolis wikiPageWikiLink Annapolis,_Maryland.
• NSS_Annapolis wikiPageWikiLink Anne_Arundel_County,_Maryland.
• NSS_Annapolis wikiPageWikiLink Baltimore–Washington_International_Airport.
• NSS_Annapolis wikiPageWikiLink Category:Buildings_and_structures_in_Anne_Arundel_County,_Maryland.
• NSS_Annapolis wikiPageWikiLink Category:Closed_facilities_of_the_United_States_Navy.
• NSS_Annapolis wikiPageWikiLink Category:Cold_War_military_installations_of_the_United_States.
• NSS_Annapolis wikiPageWikiLink Category:Communications_in_Maryland.
• NSS_Annapolis wikiPageWikiLink Category:Towers_in_Maryland.
• NSS_Annapolis wikiPageWikiLink Cheltenham,_Maryland.
• NSS_Annapolis wikiPageWikiLink High_frequency.
• NSS_Annapolis wikiPageWikiLink Maryland.
• NSS_Annapolis wikiPageWikiLink Morse_code.
• NSS_Annapolis wikiPageWikiLink Severn_River_(Maryland).
• NSS_Annapolis wikiPageWikiLink Shortwave_radio.
• NSS_Annapolis wikiPageWikiLink Submarine.
• NSS_Annapolis wikiPageWikiLink Sugar_Grove,_West_Virginia.
• NSS_Annapolis wikiPageWikiLink United_States_Navy.
• NSS_Annapolis wikiPageWikiLink Very_low_frequency.
• NSS_Annapolis wikiPageWikiLink File:NSS_Annapolis_Towers.JPG.
• NSS_Annapolis wikiPageWikiLinkText "Annapolis".
• NSS_Annapolis wikiPageWikiLinkText "NSS Annapolis".
• NSS_Annapolis wikiPageWikiLinkText "Naval Communications Station Washington, D.C. Transmitter".
• NSS_Annapolis wikiPageWikiLinkText "Naval Radio Station, Annapolis, Maryland".
• NSS_Annapolis wikiPageWikiLinkText "Naval Radio Transmitter Facility".
• NSS_Annapolis wikiPageUsesTemplate Template:Cite_web.
• NSS_Annapolis wikiPageUsesTemplate Template:Cn.
• NSS_Annapolis wikiPageUsesTemplate Template:Coord.
• NSS_Annapolis wikiPageUsesTemplate Template:Dubious.
• NSS_Annapolis wikiPageUsesTemplate Template:Maryland-struct-stub.
• NSS_Annapolis wikiPageUsesTemplate Template:Refimprove.
• NSS_Annapolis wikiPageUsesTemplate Template:US-mast-stub.
• NSS_Annapolis subject Category:Buildings_and_structures_in_Anne_Arundel_County,_Maryland.
• NSS_Annapolis subject Category:Closed_facilities_of_the_United_States_Navy.
• NSS_Annapolis subject Category:Cold_War_military_installations_of_the_United_States.
• NSS_Annapolis subject Category:Communications_in_Maryland.
• NSS_Annapolis subject Category:Towers_in_Maryland.
• NSS_Annapolis point "38.977777777777774 -76.45333333333333".
• NSS_Annapolis type Facility.
• NSS_Annapolis type Installation.
• NSS_Annapolis type Site.
• NSS_Annapolis type SpatialThing.
• NSS_Annapolis comment "NSS Annapolis, officially known as Naval Communications Station Washington, D.C. Transmitter or NavCommStaWashingtonDC(T), was a Very Low Frequency (VLF) and High Frequency (HF) transmitter station operated by the United States Navy.It was located at Greenbury Point, in Anne Arundel County, across the Severn River from Annapolis, Maryland at coordinates 38°58′40″N 76°27′12″W. NSS Annapolis was used by the USN for submarine communication.".
• NSS_Annapolis label "NSS Annapolis".
• NSS_Annapolis sameAs Q1961498.
• NSS_Annapolis sameAs NSS_Annapolis.
• NSS_Annapolis sameAs m.05k38s.
• NSS_Annapolis sameAs Q1961498.
• NSS_Annapolis lat "38.977777777777774".
• NSS_Annapolis long "-76.45333333333333".
• NSS_Annapolis wasDerivedFrom NSS_Annapolis?oldid=707784605.
• NSS_Annapolis depiction NSS_Annapolis_Towers.JPG.
• NSS_Annapolis isPrimaryTopicOf NSS_Annapolis.