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AN/SPN-21, AN/SPS-35

Description of the radar set, tactical-technical characteristics

Figure 1: AN/SPN-21

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
receive 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.