SA Air Search Radar

Drawing of SA air search radar antenna and console

Naval History and Heritage Command


Wavelength 1.36 m
Pulse Width 5 microsecond
Pulse Repetition Frequency     
60 Hz
Power 100 kW
Range 40 nautical miles (70 km) (bomber)
30 nautical miles (55 km) (fighter)
12 nautical miles (20 km) (battleship)
8 nautical miles (15 km) (destroyer)
5' by 8.8' (1.52m by 2.68m) dipole array
Scan rate 5 rotations per minute
Accuracy 300 feet/1 degrees
90 meters/1 degrees
Resolution 1500 feet/25 degrees
460 meters/25 degrees
1500 lbs
680 kg
Production: Available from 1942-9. A total of 1490 built by 1945.
SA-1 was an even lighter weight version (900 lbs or 400 kg with a 5' by 6' [1.52m by 1.83m] antenna) for destroyer escorts, and frigates. It lacked lobe switching, which  reduced its accuracy (to 3 to 5 degrees)

The SA was a derivative of CXAM used on smaller naval vessels such as destroyers (SA), destroyer escorts, and frigates (SA-1). SA had improved resolution due to the use of lobe switching and provisions for Identification Friend or Foe, but neither model provided elevation information or could match the range of the best SC radars.


Buderi (1998)

Friedman (1981)

Hezlet (1975)

Naval History and Heritage Command (accessed 2011-3-31)

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