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Description of the radar set, tactical-technical characteristics

Figure 1: AN/SPQ-2

frequency: 2 700 … 2 900 MHz
(S band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 350 … 850 Hz
pulsewidth (τ): 1 µs
receiving time:
dead time:
peak power: 700 kW
average power:
instrumented range: 50 NM (≙ 92 km)
range resolution: 150 m
accuracy: 15 m; 1°
hits per scan:
antenna rotation: 6 min⁻¹


AN/SPQ-2 is operating in the S band missile guidance radar for SSM-N-8A Regulus cruise missiles.

The AN/SPQ-2 is functionally the same as AN/MPQ-5. The principle difference is the addition of correction for the ship’s course (relative bearing), a stable element, and cross-level stabilization. Both radar types received as modernization a traveling wave tube as low-noise preamplifier in the receiver.

The antenna was a fine mesh symmetrical parabolic antenna with a diameter of 8 feet (2.44 m) and used the conical scan with 24 revolutions per second of the radiating element.

The radar was used between 1955 and 1961 until this type of missile was replaced by the SLBM Polaris A1.

Please do not confuse the radar with the much smaller Italian MM/SPQ-2D, which operates in the X-band!