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- Blue_Joker abstract "Blue Joker was an experimental moored balloon-mounted airborne early warning radar project developed by the British Air Ministry between 1953 and 1960. It may have been allocated the classification AMES Type 87 but since it did not enter service the classification was later used for the Bloodhound Mark 2 guidance radar.The system used balloons rather than aircraft because the stationary position avoided the problem of converting a moving radar plot to ground coordinates which was considered beyond the capabilities of the computers then available.The system used two, later three, hydrogen filled balloons positioned above each other along a common tether to support a 9-metre diameter resin-bonded terylene spherical radome inflated by a built-in fan to a pressure of 980 pascals (10 cm H2O). Each balloon generated 1400 kg of lift and the 1660 kg radome was carried to an altitude of 1500 metres. Electrical power and control signals were provided to the gyroscopically stabilised radar system mounted inside the radome via the tether cable, and the radar plot video signal generated by it was transmitted to the ground using a microwave radio link.The radar was developed by the Metropolitan Vickers Electrical Company and used moving target indication to eliminate the background clutter generated by the sea. During trials the radar successfully tracked an approaching Canberra jet bomber 120 miles away.Two prototypes were built and extensively tested at RAE Cardington, Bedfordshire and on a mountain site at Drum, Wales between May 1958 and mid 1960. There is still some evidence remaining on the Drum site in the Carneddau, which include the levelled hardcore area with access from the main track, two concrete foundation blocks, together with several metal pegs, which must have been used as anchor points to tether the units. The major problems were with high winds, particularly with hydrogen loss through the fabric then used for balloon construction and the maximum windspeed for safe handling on the ground of only 30 knots. Other issues were the life of the tether cable, the vulnerability to lightning strikes and the system's poor mobility.By the end of the decade the perceived threat had changed from manned Soviet bombers to ballistic missiles, for which airborne radar was not so important because of their higher trajectory.Development of Blue Joker was stopped in mid-1960 and the prototypes mothballed, and the programme abandoned completely a couple of years later.".
- Blue_Joker wikiPageExternalLink test.
- Blue_Joker wikiPageExternalLink 5664535822098250610.
- Blue_Joker wikiPageID "35290481".
- Blue_Joker wikiPageLength "4822".
- Blue_Joker wikiPageOutDegree "20".
- Blue_Joker wikiPageRevisionID "666943140".
- Blue_Joker wikiPageWikiLink Air_Ministry.
- Blue_Joker wikiPageWikiLink Air_Ministry_Experimental_Station.
- Blue_Joker wikiPageWikiLink Airborne_early_warning_and_control.
- Blue_Joker wikiPageWikiLink Ballistic_missile.
- Blue_Joker wikiPageWikiLink Bloodhound_(missile).
- Blue_Joker wikiPageWikiLink Category:Abandoned_military_projects_of_the_United_Kingdom.
- Blue_Joker wikiPageWikiLink Category:Cold_War_military_equipment_of_the_United_Kingdom.
- Blue_Joker wikiPageWikiLink Category:Ground_radars.
- Blue_Joker wikiPageWikiLink Category:Military_radars_of_the_United_Kingdom.
- Blue_Joker wikiPageWikiLink Centimetre_of_water.
- Blue_Joker wikiPageWikiLink Clutter_(radar).
- Blue_Joker wikiPageWikiLink Drum_(Wales).
- Blue_Joker wikiPageWikiLink English_Electric_Canberra.
- Blue_Joker wikiPageWikiLink Lightning_strike.
- Blue_Joker wikiPageWikiLink Metropolitan-Vickers.
- Blue_Joker wikiPageWikiLink Moving_target_indication.
- Blue_Joker wikiPageWikiLink Polyethylene_terephthalate.
- Blue_Joker wikiPageWikiLink RAF_Cardington.
- Blue_Joker wikiPageWikiLink Radome.
- Blue_Joker wikiPageWikiLink Tethered_balloon.
- Blue_Joker wikiPageWikiLinkText "Blue Joker".
- Blue_Joker beamwidth "0.8".
- Blue_Joker country "United Kingdom".
- Blue_Joker frequency "3.3".
- Blue_Joker introdate "1958".
- Blue_Joker name "Blue Joker".
- Blue_Joker number "2".
- Blue_Joker power "600.0".
- Blue_Joker pulsewidth "1.5".
- Blue_Joker range "120.0".
- Blue_Joker type "Airborne Early Warning".
- Blue_Joker wikiPageUsesTemplate Template:Infobox_radar.
- Blue_Joker subject Category:Abandoned_military_projects_of_the_United_Kingdom.
- Blue_Joker subject Category:Cold_War_military_equipment_of_the_United_Kingdom.
- Blue_Joker subject Category:Ground_radars.
- Blue_Joker subject Category:Military_radars_of_the_United_Kingdom.
- Blue_Joker hypernym Project.
- Blue_Joker type Band.
- Blue_Joker comment "Blue Joker was an experimental moored balloon-mounted airborne early warning radar project developed by the British Air Ministry between 1953 and 1960.".
- Blue_Joker label "Blue Joker".
- Blue_Joker sameAs Q4929300.
- Blue_Joker sameAs m.0j7jh88.
- Blue_Joker sameAs Q4929300.
- Blue_Joker wasDerivedFrom Blue_Joker?oldid=666943140.
- Blue_Joker isPrimaryTopicOf Blue_Joker.