SK was a very high frequency search set for large ships. It furnished range and bearing of surface vessels and aircraft, and it could be used for control of interception. It was essentially an SC-2 radar set operating at 200MHz with a larger antenna using 6×6 dipoles.[3] 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.[4]
With the antenna at 100ft (30m), SK could detect medium bombers at 1,000ft (300m) altitude at 100 miles (160km). Range accuracy was ± 100 yards (91m) and azimuth accuracy ± 3°. There was no elevation control, but elevation could be estimated roughly from positions of maximum and minimum signal strength.[4]
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 5,000lb (2,300kg). The heaviest unit, at 2,400lb (1,100kg), was the antenna assembly. The antenna measured 15ft (4.6m) x 16ft 9in (5.11m). It was mounted 100ft (30m) or more above water. The minimum operators required were one per shift. Primary power required was 3500 watts, 115 volts, 60Hz. The source of power is ship's power of 115 volts, 60Hz.[4]
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United States
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United Kingdom
SK-1 aboard HMS Trumpeter
SK-1 aboard USS Texas
SK-1 aboard USS Wichita
SK-2 aboard USS Alabama
SK-2 aboard USS Macon
SK-3 aboard USS Princeton
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