SK (radar)
SK-1 aboard USS Long Island
Country of originUnited States
ManufacturerGeneral Electric
Introduced1944
TypeAir-search radar
FrequencyVHF band
Beamwidth10°
Pulsewidth5 μs
Range160.9 km (86.9 nmi)
Azimuth± 3 °
Precision± 100 yd (91 m)
Power250 kW[1]

SK was an American-made air-search radar used during World War II by the United States Navy. Models included SK-1, SK-2 and SK-3.[2]

Overview

SK was a long wave search set for large ships. It furnished range and bearing of surface vessels and aircraft, and it could be used for control of interception. The set had both "A" and PPI scopes, provisions for operating with remote PPIs and for IFF connections, and built-in BL and BI antennas.[3]

With the antenna at 100 ft (30 m), SK could detect medium bombers at 1,000 ft (300 m) altitude at 100 miles (160 km). Range accuracy was ± 100 yards (91 m) and azimuth accuracy ± 3°. There was no elevation control, but elevation could be estimated roughly from positions of maximum and minimum signal strength.[3]

Shipment for SK included spares, with tubes for 400 hours, and a separate generator if the ship's power is DC. SK was not air transportable.

SK had 10 components weighing approximately 5,000 lb (2,300 kg). The heaviest unit, at 2,400 lb (1,100 kg), was the antenna assembly. The antenna measured 15 ft (4.6 m) x 16 ft 9 in (5.11 m). It was mounted 100 ft (30 m) or more above water. The minimum operators required were one per shift. Primary power required was 3500 kilowatts, 115 volts, 60 Hz. The source of power is ship's power of 115 volts, 60 Hz.[3]

During the later stages of World War II, a parabolic antenna called SK-2 replaced the SK-1.[1]

On board ships

United States United States

United Kingdom United Kingdom

See also

Citations

  1. 1 2 "Radar Equipment of World War II". NavWeaps.
  2. ↑ Robert, Buderi (1998). The Invention That Changed the World: How a Small Group of Radar Pioneers Won the Second World War and Launched a Technical Revolution. Touchstone. ISBN 0684835290.
  3. 1 2 3 "US Radar: Operational Characteristics of Radar Classified by Tactical Application". public2.nhhcaws.local. Retrieved 2022-02-18.

References

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