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Probably because of how the system is arranged behind the antenna faces. SPY-1 isn't all in those visible antennas, it has a really specific geometry between the antenna faces, the waveguides, and the signal generators that sit way down inside the structure. And remember that this is before SPY-1D, so there are two transmitters associated with those four antenna faces. I think what we're seeing here is basically grafting the AEGIS modular deckhouse design (for pre-Ticonderoga AEGIS concepts) onto the CGN-9 hull, so as to avoid reengineering the whole waveguide layout for one ship. Also, putting SPY-1D (when it became available) on a cruiser would have been seen as a big retrograde step. With two transmitters, SPY-1A/B could handle more targets than SPY-1D, at least until SPY-1D(V) came along.
Probably because of how the system is arranged behind the antenna faces. SPY-1 isn't all in those visible antennas, it has a really specific geometry between the antenna faces, the waveguides, and the signal generators that sit way down inside the structure. And remember that this is before SPY-1D, so there are two transmitters associated with those four antenna faces. I think what we're seeing here is basically grafting the AEGIS modular deckhouse design (for pre-Ticonderoga AEGIS concepts) onto the CGN-9 hull, so as to avoid reengineering the whole waveguide layout for one ship.
Also, putting SPY-1D (when it became available) on a cruiser would have been seen as a big retrograde step. With two transmitters, SPY-1A/B could handle more targets than SPY-1D, at least until SPY-1D(V) came along.
