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AN/SPS-21

Description of the radar set, tactical-technical characteristics

Figure 1: Antenna AN710 used by AN/SPS-21

Figure 1: Antenna AN710 used by AN/SPS-21

Specifications
frequency: 5.5 … 5.6 GHz
(C-Band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 1 500 Hz
pulsewidth (τ): 0.19 µs
receive time:
dead time:
peak power: 10 kW
average power:
instrumented range: 16 NM (≙ 30 km)
range resolution:
accuracy:
beamwidth:
hits per scan:
antenna rotation:
MTBCF:
MTTR:

AN/SPS-21

AN/SPS-21 was small and lightweight, operating in C-Band, short range surface surveillance and navigation radar designed for installation in small vessels.

The transmitter is of magnetron type self-excited oscillator. The paraboloidal reflector is 93 inches wide and 22 inches high and fed by a pyramidal horn providing linear horizontal polarization.

The first AN/SPS-21 radars were installed in 1954-1955.