AN/SPN-21, AN/SPS-35
Description of the radar set, tactical-technical characteristics
Figure 1: AN/SPN-21
| Specifications | |
|---|---|
| frequency: | 9 335 … 9 405 MHz
(X-Band) |
| pulse repetition time (PRT): | |
| pulse repetition frequency (PRF): | 750 or 1 500 Hz |
| pulsewidth (τ): | 0.2 µs |
| receiving time: | |
| dead time: | |
| peak power: | 7 kW |
| average power: | |
| instrumented range: | 32 NM (≙ 60 km) |
| range resolution: | 45 m |
| accuracy: | |
| beamwidth: | 2.2° |
| hits per scan: | |
| antenna rotation: | 20 rpm |
| MTBCF: | |
| MTTR: | |
AN/SPN-21, AN/SPS-35
AN/SPN-21 was operating in X-Band short-range navigation and surface surveillance radar designed for small boats. It is a modified military version of the Raytheon Pathfinder Model 1500 from the mid-1950s. The radar was renamed in AN/SPS-35 later.
The single curved parabolic reflector was 53 inches wide (≙ 1.32 m). It formed a fan beam pattern with a vertical beam width of 15° to 18°. The antenna, transmitter, and receiver of are an integral unit.