This HTML5 document contains 54 embedded RDF statements represented using HTML+Microdata notation.

The embedded RDF content will be recognized by any processor of HTML5 Microdata.

Namespace Prefixes

PrefixIRI
dctermshttp://purl.org/dc/terms/
dbohttp://dbpedia.org/ontology/
foafhttp://xmlns.com/foaf/0.1/
n15https://global.dbpedia.org/id/
dbthttp://dbpedia.org/resource/Template:
rdfshttp://www.w3.org/2000/01/rdf-schema#
n9http://commons.wikimedia.org/wiki/Special:FilePath/
rdfhttp://www.w3.org/1999/02/22-rdf-syntax-ns#
owlhttp://www.w3.org/2002/07/owl#
wikipedia-enhttp://en.wikipedia.org/wiki/
provhttp://www.w3.org/ns/prov#
dbphttp://dbpedia.org/property/
dbchttp://dbpedia.org/resource/Category:
xsdhhttp://www.w3.org/2001/XMLSchema#
wikidatahttp://www.wikidata.org/entity/
dbrhttp://dbpedia.org/resource/

Statements

Subject Item
dbr:USS_Plunger_(SS-179)
dbo:wikiPageWikiLink
dbr:SD_radar
Subject Item
dbr:USS_Turner_(DD-648)
dbo:wikiPageWikiLink
dbr:SD_radar
Subject Item
dbr:United_States_Porpoise-class_submarine
dbo:wikiPageWikiLink
dbr:SD_radar
Subject Item
dbr:SD_radar
rdfs:label
SD radar
rdfs:comment
The SD radar was an early form of radar developed by the United States Naval Research Laboratory between 1940 and 1941. It was installed on submarines to provide warning of enemy aircraft. Its omnidirectional antenna, however, prevented it from being able to provide bearing information, and it was used as a proximity radar. Its range was directly affected by the aircraft's size and altitude. Large aircraft with an altitude above 1000 feet AGL could be detected between twelve and twenty miles, and small aircraft at the same altitude between eight and fifteen miles, while aircraft flying lower could avoid detection altogether. Another disadvantage was the enemy's ability to use the SD radar signal to locate and target submarines, leading submarine commanders to only use the SD radar intermit
dbp:name
SD radar
foaf:depiction
n9:USS_Sculpin_(SS-191)_NH_97305.jpg
dcterms:subject
dbc:World_War_II_radars dbc:Equipment_of_the_United_States_Navy dbc:Military_equipment_introduced_from_1940_to_1944 dbc:Military_radars_of_the_United_States dbc:Naval_radars dbc:World_War_II_American_electronics
dbo:wikiPageID
68230039
dbo:wikiPageRevisionID
1121273420
dbo:wikiPageWikiLink
dbr:RCA dbr:United_States dbr:Height_above_ground_level dbr:United_States_Naval_Research_Laboratory dbr:SJ_radar dbc:Equipment_of_the_United_States_Navy dbc:Military_equipment_introduced_from_1940_to_1944 dbc:World_War_II_radars dbc:World_War_II_American_electronics dbc:Naval_radars dbc:Military_radars_of_the_United_States
owl:sameAs
wikidata:Q107675507 n15:Fwpkt
dbp:wikiPageUsesTemplate
dbt:US-navy-stub dbt:Infobox_radar dbt:Convert dbt:Reflist
dbo:thumbnail
n9:USS_Sculpin_(SS-191)_NH_97305.jpg?width=300
dbp:caption
Various masts and equipment of the USS Sculpin in 1943. The SD radar mast in designated as item 10.
dbp:country
dbr:United_States
dbp:designer
dbr:United_States_Naval_Research_Laboratory
dbp:frequency
114.0
dbp:manufacturer
dbr:RCA
dbp:number
400
dbp:power
100
dbo:abstract
The SD radar was an early form of radar developed by the United States Naval Research Laboratory between 1940 and 1941. It was installed on submarines to provide warning of enemy aircraft. Its omnidirectional antenna, however, prevented it from being able to provide bearing information, and it was used as a proximity radar. Its range was directly affected by the aircraft's size and altitude. Large aircraft with an altitude above 1000 feet AGL could be detected between twelve and twenty miles, and small aircraft at the same altitude between eight and fifteen miles, while aircraft flying lower could avoid detection altogether. Another disadvantage was the enemy's ability to use the SD radar signal to locate and target submarines, leading submarine commanders to only use the SD radar intermittently so as not to disclose their location.
dbp:azimuth
360
dbp:beamwidth
40
dbp:introdate
1941
dbp:prf
60.0
dbp:pulsewidth
8.5
dbp:rpm
4
prov:wasDerivedFrom
wikipedia-en:SD_radar?oldid=1121273420&ns=0
dbo:wikiPageLength
3715
foaf:isPrimaryTopicOf
wikipedia-en:SD_radar
Subject Item
dbr:SJ_radar
dbo:wikiPageWikiLink
dbr:SD_radar
Subject Item
dbr:SD
dbo:wikiPageWikiLink
dbr:SD_radar
dbo:wikiPageDisambiguates
dbr:SD_radar
Subject Item
wikipedia-en:SD_radar
foaf:primaryTopic
dbr:SD_radar