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AN/SPS-40
The AN/SPS-40 is a United States Navy two-dimensional, long range air search radar that is capable of providing contact bearing and range. It was used on s, s, s, s, s, s, s, s, s and many other ship classes. Its "basket" antenna with the over-the-top feed line was a familiar sight throughout the Navy even into the early '80s. It was replaced by the AN/SPS-49 on newer ships and on ships that received the New Threat Upgrade.
The SPS-40, being a vacuum tube design, was notoriously sensitive to the vibration from shipboard gunfire. A later redesign into a largely solid-state system not only improved its performance (cutting the number of cabinets by more than half) also featured one of the best MTI (Moving Target Indicator) units in the fleet - a rarity in the early 1970s.
==Gallery==
Image:USS Raleigh (LPD-1) SPS-40 radar.jpg|AN/SPS-40 antenna on
Image:USS Raleigh (LPD-1) SPS-40 radar 2.jpg|Another view of the same antenna on ''Raleigh''
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