The Pacific War Online Encyclopedia
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| Wavelength | 10 cm |
| Pulse Width | 1 microsecond |
| Pulse Repetition Frequency
|
1350 to 1650 Hz |
| Power | 50 kW |
| Range | 12 nautical miles (22 km) on battleship 8 nautical miles (15 km) on destroyer |
| Antenna |
Parabolic |
| Scope |
A scope (early production) PPI scope |
| Accuracy | 15 yards/0.3 degrees 14 meters/0.3 degrees |
| Resolution | 50 yards/5 degrees 46 meters/5 degrees |
| Production: | 300 built by 1945-2. All U.S. submarines were fitted with SJ by
early 1943. |
SJ was a submarine
radar. The first few were equipped with A-displays, but the remainder
had PPI
displays. Early versions were usable only when surfaced, but the ST
modification converted SJ to a periscope radar that could provide
accurate range information to a submerged submarine.
This radar was treasured by submariners. Though designed for surface search, it was capable of detecting bombers at a useful range.
IFF equipment began to be added to SJ in late 1943. This was crucial in allowing submarines to perform lifeguard duty without excessive danger of friendly fire incidents.
References
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