 The plan is to back-fit the existing AN/SPS-48E population from 2011 through 2020, with the SPS-48G units.They will support fleet 3D air search requirements through 2050 and beyond for the ship classes that have SPS-48G.The earlier 1st and 2nd stage RF amplifiers are replaced with a solid state transmitter and the receiver, processor, and Auxiliary Detection Processor, formerly housed in individual equipment cabinets, are combined into a single cabinet.