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Description of the radar set, tactical-technical characteristics

Figure 1: AN/SPN-12

frequency: 10 000 … 10 250 MHz
pulse repetition time (PRT):
pulse repetition frequency (PRF):
pulsewidth (τ):
receiving time:
dead time:
peak power:
average power: 10 W
instrumented range: 2 mi (≙ 3,2 km)
range resolution:
beamwidth: 3.3 or 4.25°
hits per scan:
antenna rotation:


AN/SPN-12 is operating in the X-band continuous wave radar that computes, indicates, and records the speed of aircraft making a landing approach to the carrier. Both true air speed and relative speed are indicated. Thus, the Landing Signal Officer (LSO) is supplied with accurate information on the speed of the approaching aircraft, and can wave off those attempting to land at an unsafe speed.

The radar uses a dipole fed parabolic reflector antenna with 30 inch diameter. It was manually directed to the approaching aircraft. The dipole was enclosed in a plastic bulb.