_forward_superstructure,_21_October_1944.jpg) SG (at the top of the mast) and SK-1 (below and to the left of the SG) radar antennas of USS Astoria | |
| Country of origin | United States |
|---|---|
| Introduced | 1942 |
| No. built | 955 |
| Type | Surface-search radar |
| Frequency | 3 GHz |
| PRF | 775, 800, or 825 |
| Beamwidth |
|
| Pulsewidth | 1.3–2 μs |
| RPM | 4, 8, or 12 |
| Range | 15 nmi (28 km; 17 mi) |
| Precision | 200 yd (180 m) |
| Power | 50 kW |
The SG radar was an American naval surface-search radar developed during the Second World War. The prototype was tested at sea aboard the destroyer USS Semmes in May 1941.[1] It was the first microwave surface-search radar to be equipped with a plan position indicator(PPI). The first operational set was installed aboard the heavy cruiser USS Augusta in April 1942.[2]