SM Fighter Direction Radar

Photograph of SM radar console

U.S. Navy. Via


Wavelength 10 cm
Pulse Width 1 microsecond
Pulse Repetition Frequency       775-825 Hz
Power 600-700 kW
Range 50 nautical miles (90 km) (bomber)
25 nautical miles (50 km) (battleship)
Scan rate 2-6 rotations per minute in search mode
7.5 scans per second over a 60 degree sector in track mode
PPI with 10, 50, and 80 nautical mile (19, 90, and 150 km) distance scales
Accuracy 200 yards/0.5 degree/500 feet
180 meters/0.5 degrees/150 meters
Resolution 200 yards/3 degrees
180 meters/3 degrees
Production First prototype installed on Lexington 3/43.
First two production models on Bunker Hill 9/43 and Enterprise 10/43.
A total of 23 were deployed through 1944-10.
Variants The SM-1 was a lighter version.  All 26 were given to the Royal Navy as Lend-Lease.

The SM was a fighter direction radar developed from the SCR-584.  It was rather heavy at 9 tons and so was only installed on carriers.  It could track in three dimensions with high accuracy and at close range, and it included a BM antenna for Identification Friend or Foe (IFF).  However, its distinctive beam, which was narrow both horizontally and vertically, made it unsuitable for air search.


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