DescriptionRadar antennas on USS Theodore Roosevelt SPS-64.jpg
English: AN/SPS-46(V)9 radar antenna on the USS Theodore Roosevelt aircraft carrier. This is an X-band (8-12 GHz) marine navigational radar similar to types on civilian ships, used to detect other ships in the vicinity. It has a peak power of 7 kW, a range of somewhere around 35 nautical miles. This type of antenna is called a slot antenna and radiates a narrow vertical fan-shaped beam of microwaves, about 15° high and 2.2° wide. A motor in the housing below rotates the bar-shaped antenna to scan the beam around the horizon.
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Image title
A view of the SPS-48B 3-D search radar antenna on the nuclear-powered aircraft carrier USS THEODORE ROOSEVELT (CVN-71). The SPN PL-173P carrier-controlled approach (CCA) radar is seen at the upper left while the SPS-65 antennas of the Mark 91 Fire Control System are at the bottom left. The small white bar antenna is the SPS-64(V)9 radar unit.