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Statements

Subject Item
dbr:AI_Mark_IV_radar
rdfs:label
Radar AI Mk. IV AI Mark IV radar Radar AI Mark IV
rdfs:comment
Le radar AI Mk. IV (« Airborne Interception radar Mark IV ») est le premier modèle opérationnel de (en). Des radars AI Mk. III sont apparus en juillet 1940 sur le Bristol Blenheim, tandis que la version définitive Mk. IV a été installé en plus grand nombre sur le chasseur lourd Bristol Beaufighter au début de l'année 1941. Sur le Beaufighter, le Mk. IV a sans doute joué un rôle dans la fin du « Blitz », la campagne de bombardements stratégiques durant la Seconde Guerre mondiale mené par la Luftwaffe contre le Royaume-Uni. Radar, Airborne Interception, Mark IV (AI Mk. IV), produced by USA as SCR-540, was the world's first operational air-to-air radar system. Early Mk. III units appeared in July 1940 on converted Bristol Blenheim light bombers, while the definitive Mk. IV reached widespread availability on the Bristol Beaufighter heavy fighter by early 1941. On the Beaufighter, the Mk. IV arguably played a role in ending the Blitz, the Luftwaffe's night bombing campaign of late 1940 and early 1941.
dbp:name
AI Mk. IV
foaf:depiction
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dcterms:subject
dbc:World_War_II_radars dbc:Military_radars_of_the_United_Kingdom dbc:Aircraft_radars dbc:Military_equipment_introduced_from_1940_to_1944 dbc:World_War_II_British_electronics
dbo:wikiPageID
43239543
dbo:wikiPageRevisionID
1112362727
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dbpedia-id:Radar_AI_Mark_IV n19:hiHE wikidata:Q17508037 dbpedia-fr:Radar_AI_Mk._IV
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dbo:thumbnail
n11:Royal_Air_Force_Radar,_1939-1945_CH15214.jpg?width=300
dbp:caption
Group Captain "Paddy" Green achieved most of his 11 confirmed kills in this Mk. IV-equipped Beaufighter.
dbp:country
UK
dbp:frequency
193.0
dbp:otherNames
AIR 5003, SCR-540
dbp:power
10.0
dbp:type
Airborne interception
dbo:abstract
Le radar AI Mk. IV (« Airborne Interception radar Mark IV ») est le premier modèle opérationnel de (en). Des radars AI Mk. III sont apparus en juillet 1940 sur le Bristol Blenheim, tandis que la version définitive Mk. IV a été installé en plus grand nombre sur le chasseur lourd Bristol Beaufighter au début de l'année 1941. Sur le Beaufighter, le Mk. IV a sans doute joué un rôle dans la fin du « Blitz », la campagne de bombardements stratégiques durant la Seconde Guerre mondiale mené par la Luftwaffe contre le Royaume-Uni. Radar, Airborne Interception, Mark IV (AI Mk. IV), produced by USA as SCR-540, was the world's first operational air-to-air radar system. Early Mk. III units appeared in July 1940 on converted Bristol Blenheim light bombers, while the definitive Mk. IV reached widespread availability on the Bristol Beaufighter heavy fighter by early 1941. On the Beaufighter, the Mk. IV arguably played a role in ending the Blitz, the Luftwaffe's night bombing campaign of late 1940 and early 1941. Early development was prompted by a 1936 memo of Henry Tizard on the topic of night fighting. The memo was sent to Robert Watt, director of the radar research efforts, who agreed to allow physicist Edward George "Taffy" Bowen to form a team to study the problem of air interception. The team had a test bed system in flights later that year, but progress was delayed for four years by emergency relocations, three abandoned production designs, and Bowen's increasingly adversarial relationship with Watt's replacement, Albert Percival Rowe. Ultimately, Bowen was forced from the team just as the system was finally maturing. The Mk. IV series operated at a frequency of about 193 megahertz (MHz) with a wavelength of 1.5 metres, and offered detection ranges against large aircraft up to 20,000 feet (6.1 km). It had numerous operational limitations, including a maximum range that increased with the aircraft's altitude and a minimum range that was barely close enough to allow the pilot to see the target. Considerable skill was required of the radar operator to interpret the displays of its two cathode ray tubes (CRTs) for the pilot. It was only with the increasing proficiency of the crews, along with the installation of new ground-based radar systems dedicated to the interception task, that interception rates began to increase. These roughly doubled every month through the spring of 1941, during the height of The Blitz. The Mk. IV was used in the front lines for only a short period. The introduction of the cavity magnetron in 1940 led to rapid progress in microwave-frequency radars, which offered far greater accuracy and were effective at low altitudes. The prototype Mk. VII began to replace the Mk. IV at the end of 1941, and the AI Mk. VIII largely relegated the Mk. IV to second-line duties by 1943. The Mk. IV's receiver, originally a television receiver, was used as the basis of the ASV Mk. II radar, Chain Home Low, AMES Type 7, and many other radar systems throughout the war.
dbp:beamwidth
~175 degrees
dbp:precision
5
dbp:prf
750
dbp:pulsewidth
2.8
prov:wasDerivedFrom
wikipedia-en:AI_Mark_IV_radar?oldid=1112362727&ns=0
dbo:wikiPageLength
115218
foaf:isPrimaryTopicOf
wikipedia-en:AI_Mark_IV_radar