page_title: AN/SPS-49
section_title: Operation
hierarchical_section_title: AN/SPS-49 / Operation
caption_attribution_description: English: The scheme of the combat systems of the Oliver Hazard Perry class frigate. 日本語: オリバー・ハザード・ペリー級ミサイルフリゲートの戦闘システムの概要図。参考文献は下記。 野木恵一「O.H.ペリー級のメカニズム」、『世界の艦船』第526号、海人社、1997年7月、74-81頁、共通雑誌コード 1105603071002。 吉原栄一「艦隊のワークホース O.H.ペリー級 その設計思想」、『世界の艦船』第526号、海人社、1997年7月、70-73頁、共通雑誌コード 1105603071002。
context_page_description: The AN/SPS-49 is a United States Navy two-dimensional, long range air search radar built by Raytheon that can provide contact bearing and range. It is a primary air-search radar for numerous ships in the U.S. fleet and in Spain, Poland, Taiwan aboard Oliver Hazard Perry-class frigates, Canada on its Halifax-class frigate, New Zealand on its Anzac-class frigates and Australia on its Adelaide-class frigates and Anzac-class frigates. It formerly served in a complementary role aboard Aegis cruisers with the AN/SPY-1 but the systems are currently being removed during routine upgrade with no replacement.
context_section_description: First tested in 1965 aboard USS Gyatt and introduced in 1975, the AN/SPS-49 operates in the 851–942 MHz, or L-, band and has a range of 256 nautical miles (474 km). The orange-peel parabolic shape of the antenna creates a narrow 3.3°-beam to reduce the probability of detection or jamming. It can rotate at 6  rpm in long range mode or 12 rpm in short-range mode.  Default is at 12 rpm for the AN/SPS-49A(V)1, to provide more frequent scans against incoming missiles.  The SPS-49A(V)1 can detect out to its full range at either 6 or 12 rpm. The antenna is stabilised to compensate for ships pitch and roll, to a maximum of +/-15° for both pitch and roll in 12 rpm mode, and +/-23.5° for both pitch and roll in 6 rpm mode. The output stage of the transmitter in all variants uses a two-cavity klystron amplifier. 
  In 1998, the Inspector General of the Department of Defense reported that SPS-40 and SPS-49 radars in Bahrain were "unusable because the equipment operates on a frequency that interferes with the Bahrain telecommunications services".
caption: The AN/SPS-49 is part of the combat systems of the Oliver Hazard Perry-class frigate.
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