The Pacific War Online Encyclopedia

SO Surface Search Radar

Diagram of SO surface search radar

Wavelength	10 cm
Pulse Width	0.37 or 1 microsecond
Pulse Repetition Frequency	650 Hz
Power	65 kW
Range	15 nautical miles (28 km) on low-flying bomber 20 nautical miles (37 km) on surface warships 5 nautical miles (9 km) on submarines
Scan rate	12 rotations per minute
Display	5" MM-PPI with 5, 20, 70 mile (8, 30, and 110 km) range scales
Accuracy	200 yards/2 degree 180 meters/2 degree
Resolution	200 yards/2 degrees 180 meters/2 degrees
Weight	420 lbs 190 kg
Variants	SO-1, SO-2, SO-7, SO-8, SO-9, SO-11 and SO-13 were all 10 cm sets that had slightly different powers and ranges. SO-3, SO-4 and SO-12 (CXBX) operated at 3 cm but were designed to be as much like the 10 cm sets as possible. SO-7M was designed for use on Marine reconnaissance cars.
Production:	525 SO and 587 SO-13 between 1944-2 and 1944-11 2047 SO-1 and 1700 SO-8 by 1944-11 535 SO-2 and 110 SO-9 by 1944-11 350 SO-4 by 1944-11 235 SO-3

SO was a family of surface search radars developed from the unsuccessful SE for use on small craft, such as PT boats and LCCs. The 7M version was a mobile set mounted in a truck or reconnaissance car and provided to Marine units by early 1945.

References

Buderi (1998)

Friedman (1981)
Guerlac (1987)

LoneSentry.com (accessed 2010-12-29)

Navy History and Heritage Command (accessed 2010-9-26)

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