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The AN/SPG-51 is a pulse-Doppler, target tracking and illumination radar used with the Tartar/Standard-MR surface-to-air missile and in conjunction with the Mk 74 gun and missile fire-control system. It was designed for use on medium and large ships.

The antenna is a dual-purpose parabolic dish reflector with offset horn feed. The Mk 74 uses two SPG-51 radar antennas per missile launcher.

The antennas are stepped down from the air search radar that first detects the target. This...

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