Type 903

The British MRS 3 (medium-range system) gunfire-control system was based on the U.S. Mk 56. The Type 903 radar was derived from the U.S. Mk 35. MRS 3 systems with the Type 903 radar were the standard post-World War II British gun fire-control systems.

The MRS 3 has a parabolic dish antenna mounted on the right front of the director. The radar is fed by a nutating, conical-scan feed located in the center of the reflector. Directly ahead of the feed is a small disk supported by...