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The system is computer controlled and uses four complementary antennas to provide 360-degree coverage. The system was first installed in 1973 on USS Norton Sound and entered active service in 1983 as the SPY-1A on USS Ticonderoga. The -1A was installed on ships up to CG-58, with the -1B upgrade first installed on USS Princeton in 1986.
In a properly designed active system, no reengineering or rebalancing of the original system is required when the system is expanded. Optical fiber systems can provide coverage in areas up to 2 km from the signal source making them ideal for campus environments. An active system will always be more expensive than a passive system. [1]
The antenna is mechanically steered, [4] uses a parabolic reflector, [5] and operates at 8 to 12 GHz (X Band). [2] [1] The system is a component of the Mk 99 fire-control system (FCS). [1] The first units were installed on the cruiser USS Ticonderoga, which was commissioned in 1983. Since then, the SPG-62 has been placed in service with many U ...
The system had 120 high band antennas and 40 low band antennas which had to be positioned within +/- two minutes of arc and +/- 3 inches of their intended distance from the center of the array. 160 75 ohm coaxial transmission lines were used to carry signals from the antennas had to be electrically matched to within 3/4 of a degree at 10 MHz.
The system was introduced in the new Zumwalt-class destroyers and Gerald R. Ford-class aircraft carriers. On both of these classes, the AN/SPY-3 was originally to be combined with the S Band AN/SPY-4 under the designator "Dual Band Radar". In June 2010, Pentagon acquisition chief Ashton Carter announced that they will be removing the SPY-4 S ...
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