MK. 37 FIRE CONTROL DIRECTOR it is!
Radars are the Mk. 12 (Large) and the Mk. 22 "Orange Peel."
Congrats!
FIRE CONTROL SPECIFICATIONS:The Mk 37 Fire Director was used on the 5"/38 Caliber gun and was normally included as part of the upgrade package. The Mk 37 included the Mk 12 ranging radar (the large dish).
The Mark 37 GFCS was essentially an improvement of the Mark 33 GFCS that was developed in the 1930s. The Mark 37 relocated the ballistic computer, stable element and radar equipment below decks, leaving the range finder and tracking system in the director. Development began in 1936 with operational testing in 1939 and general fielding in 1940. At the time of fielding the Mark 37 was the finest fire control system in the world. It incorporated the finest optics, best radar, an excellent stabilization system, state of the art computation and data transmission, and remote control. It had a range of 18,000 yards and could handle a lead angle of 30 degrees. During world war II it was equipped with the Mark 1 computer and could engage targets traveling up to 440 knots. Following WW2, it was upgraded to the Mark 1A computer that could engage targets up to 880 knots.
A complete system consisted of:
Mark 37 director
Mark 42 range finder
Radar Antenna (Mk 4, Mk12/22 and later the Mk 25)
Mark 1 Computer (later the Mk 1A)
Mark 6 Stable element
Mark 1 Star Shell Computer
Fire Control Switchboard
Target Designators (see below)
Illumination Control
RADAR SPECIFICATIONS:Mark 12
War Status: Used on Mark 37 directors, installed 1944.
Purpose: Fire Control of 5" guns.
Power: 100-110 KW
Wavelength: 33 cm
PRF: 480
Transmitter Dimensions: 6 x 6 feet
Tracking Range: 45,000 yards for bombers and 40,000 yards for large ships.
Range Accuracy: 20 yards
Bearing Accuracy: 3 mils
Resolution: 300 yards and 7 degrees
Notes: Replaced the Mark 4. Had automatic tracking in range and measurement of range rate.
A later addition to the Mk 37 Fire Director was the Mk 22 "orange peel" radar mounted on the right side. The Mk 22 ranging radar was designed to overcome the Mk 12's inability to reliably track targets at low deflection angles.
Mark 22
Transmitter Dimensions: 1.5 x 6 feet
Power: 25-35 KW
Wavelength: 3 cm
Notes: Used solely to detect low flying aircraft at 0.8 degrees above the horizon. ranges much as for the Mark 12.
