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The Admiral Graf Spee used this unit successfully against shipping in the Atlantic. In December 1939, after heavy fighting during the Battle of the River Plate, the Admiral Graf Spee was severely damaged and the captain scuttled the ship in the neutral harbor off Montevideo, Uruguay. The ship sank in shallow water such that its radar antenna ...
Admiral Graf Spee was the first German warship to be equipped with radar. [6] A FMG G(gO) "Seetakt" set [7] [a] was mounted on the foretop range finder. [5] Admiral Graf Spee ' s primary armament was six 28 cm (11 in) SK C/28 guns mounted in two triple gun turrets, one forward and one aft of the superstructure.
The AN/FPS-35 frequency diversity radar was a long range search radar used in the early 1960s. It was one of the largest air defense radars ever produced, with its antenna and supporting structure mounted on one of the largest rolling-element bearings in the world (with a ball pitch of 12 ft 7 inches in diameter.). [1]
The production radar was manufactured by General Electric and Hazeltine. [8] The first version, the AN/APS-20A, had, initially, an 8-foot-4-inch (2.54 m) antenna and operated on a frequency of 2850 MHz in the S band. [3] The radar featured large sidelobes. [9] Later a slightly smaller 8 ft (2.4 m) antenna was used. [8]
The AN/FPS-117 is an L-band active electronically scanned array (AESA) 3-dimensional air search radar first produced by GE Aerospace in 1980 and now part of Lockheed Martin. [1] [2] The system offers instrumented detection at ranges on the order of 200 to 250 nautical miles (370 to 460 km; 230 to 290 mi) and has a wide variety of interference and clutter rejection systems.
To scan a portion of the sky, a non-PESA radar antenna must be physically moved to point in different directions. In contrast, the beam of a PESA radar can rapidly be changed to point in a different direction, simply by electrically adjusting the phase differences between different elements of the passive electronically scanned array (PESA).
AN/SPS-12 is a completely improved version based on SPS-6C. The antenna measures 17 ft (5.2 m) x 6 ft (1.8 m), weighs 550 lb (250 kg), and has a PRF of 300 to 600 pps. The radar coverage was similar to the AN/SPS-6B. In addition, it could be operated in an environment with a wind speed of up to 70 kn (36 m / s).
At SAGE sites, the antenna azimuth was selected by command from the Air Division, and the operator could slew the antenna plus or minus ten degrees for fine adjustment. The AN/FPS-90 radar was designated a high-power model, using a QK-338A magnetron and rated at 4.5 MW peak power, versus the QK-327A magnetron at 3.5 MW peak power.