There is a good history of the SBX-1 at the following link. it is a PDF file. Godd infor there:
Among many other things (including its operational history), it lists:
• The SBX-1 serves as the largest and most sophisticated phased array electro-mechanically steered X-band radar in the world. Steering ectronically within its field of coverage and mechanically in azimuth elevation allows the radar to track a full 360 degrees in azimuth and about 90 degrees in elevation from near the horizon to the zenith. As aresult, the radar can track objects as they fly toward, over, and away from the vesselthe vessel.
• Approximately 45,000 transmit/receive modules in the radar operatetogether to form the radar beam, which is capable of seeing an object the size of a baseball at a distance of 2,500 miles. Each module consists of the fi nal transmit stage and initial receive stage from each antenna element. The radar also uses 69,632 multi-sectional circuits to transmit, receive, and amplify signals.
• The SBX-1, which is capable of traveling 8 knots under its own power, measures 240 feet wide, 390 feet long, and 280 feet high from its keel to the top of the radar dome (radome).
• Air pressure alone supports the radome that surrounds the radar. The radome weighs 18,000 pounds, stands more than 103 feet high, and measures 120 feet in diameter. Moreover, the high-tech synthetic fabric allows the radome to withstand winds in excess of 130 miles per hour.
• The SBX-1 crew includes approximately 86 officers, civilians, and contractor personnel to carry out its mission.
• In addition to the inherent stability of the vessel, the radar itself provides electronic stabilization of the radar beam to continue mission operations as the vessel responds to changing sea conditions.
• The marine diesel fuel capacity of the SBX-1 is 1.8 million gallons.
• As the principle midcourse sensor for the BMDS, the radar’s major functions are cued search, precision tracking, object discrimination, and providing a missile kill assessment. The In-flight Interceptor Communication System Data Terminal communicates instructions from the GMD Fire Control
In its first at sea deployment in 2008, SBX-1 travelled more than 4,000 miles around the Pacific Ocean.