SO Surface Search Radar

Diagram of SO surface search radar

Navy History and Heritage Command


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
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
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.


Buderi (1998)

Friedman (1981)
Guerlac (1987) (accessed 2010-12-29)

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

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