Le Materiel de Détection US en 1942
Le SCR-270 (Signal Corps Radio, model 270) est l'un des premiers radars d'alerte utilisé par l'armée américaine pendant la Seconde Guerre mondiale. Il est aussi connu sous le nom de Radar Pearl Harbor car c'est ce type de radar qui détecta l'attaque japonaise du 7 décembre 1941 à Hawaii. Deux versions furent produites, le SCR-270 (mobile) et le SCR-271 (fixe).
http://www.skylighters.org/radar/index.html
on y apprend entre autre que...
SCR-270-D Mobile Long Wave Aircraft Warning Set
SCR-270-D
SCR-270-D
DESCRIPTION: Six-vehicle mobile, long wave early warning aircraft detector. Azimuth and range supplied. Set is equipped with "A" scope.
USES: To establish a screen of warning which provides information of approaching aircraft as early as possible but with a sacrifice of accuracy in range, azimuth and elevation. IFF equipment RC-150 is used.
PERFORMANCE
AND SITING: Maximum range on a single bomber flying at indicated heights, when set is on a flat sea level site:
Altitude, feet 1000 5000 20,000 25,000
Range, miles 20 50 100 110
Set should be sited at a height between 100' and 1000' above an unobstructed reflecting surface.
TRANSPORTABILITY: Complete set is carried in 6 vehicles, the largest of which measures 30'4" x 9'10" x 8'. Total weight of shipment is 101,790 lbs; total volume 11,485 cu. ft.
INSTALLATION: Operates from trucks in which mounted. Can be placed in operation about 6 hours after arrival at site.
PERSONNEL: Seven men comprise operating crew. For 24 hour operation about 50 men are required to run radar, communication radio, and camp.
POWER: 15.3 KW, supplied by PE-74, 25 KVA gasoline-driven generator, having fixed consumption of 4 gal. per hour, non-leaded gasoline.
d'ou on peut déduire une altitude minimale lorsque la cible est à 120 miles à l'ouest de L.A. (20000 pieds)
Quand au SCR 268 B
SCR-268 and SCR-268-B Mobile Long Wave Searchlight Control Set
SCR-268-B
SCR-268-B
DESCRIPTION: Mobile medium-range long-wave searchlight control, AAAIS, and substitute gun-laying equipment. SCR-268 consists of two trailers; SCR-268-B, of a trailer and 4 trucks, Uses IFF RC-148.
USES: To search for targets and furnish position data for AAAIS. Transmits present azimuth and angular height to searchlight control station for directing searchlight. Transmits present azimuth, angular height and altitude to M-4, M-7, or M-9 directors for gun-laying.
PERFORMANCE
AND SITING: Reliable maximum range, 50,000 yds. Minimum range, 3000 yds. With set carefully oriented and aligned, average errors are as follows: altitude, 100 yds; azimuth, 10 mils; angular height (above 350 mils), 10 mils. Orientation and alignment are complex, and must be checked daily. For best results, set should be located on high ground, level for 100 yds. roundabout.
TRANSPORTABILITY: Equipment is carried in vehicles. Total weight of SCR-268 is 15 tons. Largest vehicle weighs 9 tons and measures 8' x 102/3' x 18'. total weight of SCR-268-B is 42.6 tons. Largest vehicle weighs 14 tons and measures 81/3' x 11' x 243/4'.
INSTALLATION: Thirteen men can install set and obtain approximate data in 2 hrs. Accurate orientation and alignment take 4 more hours.
PERSONNEL: Minimum of 5 operators and a Chief Radar Operator are required.
POWER: 9 KVA, 120 V, 50-60 cycles AC required. Source is generator (supplied with set). Unleaded gasoline should be used when possible. Consumption is 3 to 4 gal. pe
Photo du radar SRC 268 replié
Gravure du SRC 270D
http://www.skylighters.org/radar/index.html
on y apprend entre autre que...
SCR-270-D Mobile Long Wave Aircraft Warning Set
SCR-270-D
SCR-270-D
DESCRIPTION: Six-vehicle mobile, long wave early warning aircraft detector. Azimuth and range supplied. Set is equipped with "A" scope.
USES: To establish a screen of warning which provides information of approaching aircraft as early as possible but with a sacrifice of accuracy in range, azimuth and elevation. IFF equipment RC-150 is used.
PERFORMANCE
AND SITING: Maximum range on a single bomber flying at indicated heights, when set is on a flat sea level site:
Altitude, feet 1000 5000 20,000 25,000
Range, miles 20 50 100 110
Set should be sited at a height between 100' and 1000' above an unobstructed reflecting surface.
TRANSPORTABILITY: Complete set is carried in 6 vehicles, the largest of which measures 30'4" x 9'10" x 8'. Total weight of shipment is 101,790 lbs; total volume 11,485 cu. ft.
INSTALLATION: Operates from trucks in which mounted. Can be placed in operation about 6 hours after arrival at site.
PERSONNEL: Seven men comprise operating crew. For 24 hour operation about 50 men are required to run radar, communication radio, and camp.
POWER: 15.3 KW, supplied by PE-74, 25 KVA gasoline-driven generator, having fixed consumption of 4 gal. per hour, non-leaded gasoline.
d'ou on peut déduire une altitude minimale lorsque la cible est à 120 miles à l'ouest de L.A. (20000 pieds)
Quand au SCR 268 B
SCR-268 and SCR-268-B Mobile Long Wave Searchlight Control Set
SCR-268-B
SCR-268-B
DESCRIPTION: Mobile medium-range long-wave searchlight control, AAAIS, and substitute gun-laying equipment. SCR-268 consists of two trailers; SCR-268-B, of a trailer and 4 trucks, Uses IFF RC-148.
USES: To search for targets and furnish position data for AAAIS. Transmits present azimuth and angular height to searchlight control station for directing searchlight. Transmits present azimuth, angular height and altitude to M-4, M-7, or M-9 directors for gun-laying.
PERFORMANCE
AND SITING: Reliable maximum range, 50,000 yds. Minimum range, 3000 yds. With set carefully oriented and aligned, average errors are as follows: altitude, 100 yds; azimuth, 10 mils; angular height (above 350 mils), 10 mils. Orientation and alignment are complex, and must be checked daily. For best results, set should be located on high ground, level for 100 yds. roundabout.
TRANSPORTABILITY: Equipment is carried in vehicles. Total weight of SCR-268 is 15 tons. Largest vehicle weighs 9 tons and measures 8' x 102/3' x 18'. total weight of SCR-268-B is 42.6 tons. Largest vehicle weighs 14 tons and measures 81/3' x 11' x 243/4'.
INSTALLATION: Thirteen men can install set and obtain approximate data in 2 hrs. Accurate orientation and alignment take 4 more hours.
PERSONNEL: Minimum of 5 operators and a Chief Radar Operator are required.
POWER: 9 KVA, 120 V, 50-60 cycles AC required. Source is generator (supplied with set). Unleaded gasoline should be used when possible. Consumption is 3 to 4 gal. pe
Photo du radar SRC 268 replié
Gravure du SRC 270D
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