Long-Range Aircraft Warning Sets

SCR-270-D Mobile Long Wave Aircraft Warning Set

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.

SCR-271-D and SCR-271-E Fixed Long Wave Aircraft Warning Set

SCR-271-D

DESCRIPTION:	Fixed long wave early warning aircraft detector. Azimuth and range supplied on "A" scopes. 271-D has a 100' tower; 271-E, a 50' tower.
USES:	To establish a screen of warning which gives data on aircraft as early as possible, but with a sacrifice of accuracy in range, azimuth and elevation. IFF equipment RC-151 is used.
PERFORMANCE AND SITING:	Maximum range on a single medium bomber flying at indicated altitudes, when set is on a flat sea level site: Altitude, feet 1000 5000 20,000 25,000 SCR-271-E Range, miles 20 50 100 110 SCR-271-D Range, miles 25 60 120 135 Sets should be sited so that the mean antenna height is between 100 and 1000 ft. above an unobstructed flat surface. The 100' tower should be used when it is desired to get additional low coverage, or to insure clearance above surrounding trees or other obstructions.
TRANSPORTABILITY:	Sets are packed in 106 units, weighing a total of 42,279 lbs. Largest unit is 176" x 25" x 20". Total volume is 4008 cu. fit.
INSTALLATION:	Requires a weatherproof building approx. 20' x 40' for housing radar components and a building approx. 20' x 20' for housing the power units and switchboard. A 100 foot tower on concrete footings is required for an SCR-271-D and a 50-ft. tower for an SCR-271-3. Buildings and tower are built by engineers in about 3 weeks. Radar can be installed by five men in about two weeks.
PERSONNEL:	7 men are operating crew. For 24 hour operations, about 50 men are required for radar, communication radio, and camp.
POWER:	15.3 KW supplied by PE 74, 25 KVA gasoline-driven generator. Consumption is 4 gal. per hour, non-leaded standard commercial gas.

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