SK radar

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.

Overview
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. 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.

With the antenna at 100 ft, SK could detect medium bombers at 1,000 ft altitude at 100 mi. Range accuracy was ± 100 yd and azimuth accuracy ± 3°. There was no elevation control, but elevation could be estimated roughly from positions of maximum and minimum signal strength.

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 5000 lb. The heaviest unit, at 2400 lb, was the antenna assembly. The antenna measured 15 ft x 16 ft. It was mounted 100 ft or more above water. The minimum operators required were one per shift. Primary power required was 3500 watts, 115 volts, 60 Hz. The source of power is ship's power of 115 volts, 60 Hz.

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

[[united states|🇺🇸]] United States

 * F7U-3 CVB-43 Nov1952.jpg]]Midway-class aircraft carrier
 * Essex-class aircraft carrier
 * Independence-class aircraft carrier
 * USS Enterprise (CV-6)
 * USS Saratoga (CV-3)
 * Casablanca-class escort carrier
 * Bogue-class escort carrier
 * USS Honolulu (CL-48) at anchor in 1944.jpeg]]Iowa-class battleship
 * South Dakota-class battleship
 * North Carolina-class battleship
 * Colorado-class battleship
 * Tennessee-class battleship
 * USS Pennsylvania (BB-38)
 * [[File:USS Augusta (CA-31) steaming off Portland, Maine (USA), on 9 May 1945 (NH 97932).jpg|thumb|SK-1 aboard [[USS Augusta (CA-31)|USS Augusta (CA-31)]]]]Nevada-class battleship
 * New York-class battleship
 * USS Arkansas (BB-33)
 * Alaska-class cruiser
 * Des Moines-class cruiser
 * Oregon City-class cruiser
 * Baltimore-class cruiser
 * USS Wichita (CA-45)
 * Fargo-class cruiser
 * Cleveland-class cruiser
 * New Orleans-class cruiser
 * Brooklyn-class cruiser
 * Portland-class cruiser
 * Northampton-class cruiser
 * Pensacola-class cruiser
 * Omaha-class cruiser
 * Currituck-class seaplane tender
 * Appalachian-class command ship
 * Mount McKinley-class command ship
 * Commencement Bay-class escort carrier

[[united kingdom|🇬🇧]] United Kingdom

 * Ruler-class escort carrier
 * HMS Boxer (F121)