The Pacific War Online Encyclopedia
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|Pulse Width||1 microsecond|
|Pulse Repetition Frequency
||1350 to 1650 Hz|
|Range||12 nautical miles (22 km) on battleship
8 nautical miles (15 km) on destroyer
||A scope (early production)
|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
SJ was a submarine
radar. The first few were equipped with A-displays, but the remainder
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.
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