SG-3, SG-4
Description of the radar set, tactical-technical characteristics
Figure 1: Antenna 64AJP of SG-3 radar
| Specifications | |
|---|---|
| frequency: | 3 400 … 3 700 MHz
(S-Band) |
| pulse repetition time (PRT): | |
| pulse repetition frequency (PRF): | 750 Hz |
| pulsewidth (τ): | 0.33 or 1.25 µs |
| receiving time: | |
| dead time: | |
| peak power: | 300 … 500 kW |
| average power: | |
| instrumented range: | 80 NM (≙ 148 km) |
| range resolution: | 200 yards |
| accuracy: | ±100 yards; ±0.75° |
| beamwidth: | 3° |
| hits per scan: | |
| antenna rotation: | 2.5 or 5 min⁻¹ |
| MTBCF: | |
| MTTR: | |
SG-3, SG-4
SG-3 and SG-4 were operating in S-Band naval surface scanning radars, differing only in the antenna used (SG-4 antenna is stabilized; SG-3 antenna is not).
The antenna of SG-3 consists of an offset paraboloidal section of slat-type construction with a waveguide and horn feed with horizontal polarization. The reflector is 1½ feet high and 7 feet wide. The antenna is tiltable through 10 degrees in elevation. The vertical half-power beamwidth of SG-3 antenna is 13 degrees, SG-4 antenna 6.5 degrees of.
Sources:
- Military Standardization Handbook United States Radar Equipment Manual TM 11-487C-1 1965, p. 1176ff
- Antenna Catalog Volume III, Ship Antennas, Georgia Institute of Technology, October 1960, AD323191, p. 140f