Description of the radar set, tactical-technical characteristics
Figure 1: Antenna AN710 used by AN/SPS-21
|frequency:||5.5 … 5.6 GHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||1 500 Hz|
|pulsewidth (τ):||0.19 µs|
|peak power:||10 kW|
|instrumented range:||16 NM (≙ 30 km)|
|hits per scan:|
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.