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Van Speijk-class frigate : ウィキペディア英語版 | Van Speijk-class frigate
The ''Van Speijk'' class frigates were built for the Royal Netherlands Navy in the 1960s. They were versions of the British s with Dutch radars. The British design was chosen in order to enable rapid construction in order to replace elderly destroyer escorts and take up part of the NATO patrol duties of the decommissioned anti-submarine warfare carrier . The ships were modernised in the late 1970s. All six ships were sold to the Indonesian Navy in 1986–89 and are still in service (as of 2014) as the ''Ahmad Yani'' class frigates. ==Dutch modifications==
For the most part the Dutch limited their changes to the ''Leander'' design to a wholesale replacement of the original British electronics and electrical equipment by those from Dutch manufacturers. Hollandse Signaalapparaten supplied the entire electronics suite. Specifically their LW-02 long-range air-surveillance radar, the DA-02 medium-range air/surface search radar and the M45 combined radar and optical fire control system for the guns. The Dutch HSA M44 radar/visual director for the Seacat anti-aircraft missiles could automatically target in elevation and bearing and allowed the single Seacat launcher on the British ships to be increased to two launchers on the Dutch ships, each with their own director.〔Adams, p. 193〕
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