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National Archives #19-N-40832.
Cropped by author.
| Wavelength | 10 cm |
| Pulse Width | 2 microsecond |
| Pulse Repetition Frequency
|
775, 800 or 825 Hz |
| Scan rate | 4, 8, or 12 rotations per minute |
| Power | 50 kW |
| Range | 15 nautical miles (30 km) (low-altitude bomber) 22 nautical miles (41 km) (battleship) 15 nautical miles (30 km) (destroyer) |
| Antenna |
48" by 15" (122cm by 38cm) cut parabola |
| Scope |
9" (23cm) PPI 5" (13 cm) A scope |
| Accuracy | 200 yards/2 degrees 180 meters/2 degrees |
| Resolution | 400 yards/2 to 3 degrees 370 meters/2 to 3 degrees |
| Weight | 3000
lbs 1350 kg |
| Production: | First available in the Pacific in October 1942 and installed on all cruisers and destroyers by early 1943. 955 were produced by 11/43. |
The SG was a vast improvement over SC
radar when it was first introduced in 1942. It was standard on cruisers
and destroyers
by early 1943. Early models did not have the full 50kW power,
but
all models had a 9" (23 cm) PPI display with 15,000 and 75,000 yard
(13,700 and 69,000 meter) range scales as well as a 5" (13 cm) "A"
scan.
The radar was initially buggy and sensitive to shock, and the set on Honolulu at the Battle of Tassafaronga seems to have performed poorly. However, later sets proved sturdy, compact, and dependable. It was well-suited
for
navigation, being capable of easily distinguishing ships from islands.
Starting in 1944, the radar was equipped with antijamming features.
References
Friedman
(1981)
Guerlac (1987)
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