The Pacific War Online Encyclopedia: SM1 Fighter Direction
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The Pacific War Online Encyclopedia | |
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U.S. Navy. Via ibiblio.org
| 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 mode7.5 scans per second over a 60 degree sector in track mode |
| Scope | PPI with 10, 50, and 80 nautical mile (19, 90, and 150 km) distance scales |
| Accuracy | 200 yards/0.5 degree/500 feet180 meters/0.5 degrees/150 meters |
| Resolution | 200 yards/3 degrees180 meters/3 degrees |
| Production | First prototype installed on Lexington 3/43.First two production models on Bunker Hill 9/43 and Enterprise10/43.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.
References
The Pacific War Online Encyclopedia © 2007-2009, 2011 by Kent G. Budge. Index
