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Description of the radar set, tactical-technical characteristics

Figure 1: ASR-7 in Museo Aeronaútico y del Espacio de Chile

frequency: 2 700 … 2 900 MHz
(S band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 713 …1 200 Hz
pulsewidth (τ): 0.833 µs
receiving time:
dead time:
peak power: 425 kW
average power:
instrumented range: 60 NM (≙ 110 km)
range resolution: 150 m
accuracy: ± 1%
beamwidth: 1.5°
hits per scan:
antenna rotation: 12,75 or 15 rpm


The ASR-7 was an air traffic control radar operating in the S band for use at airports. The military version was called AN/GPN-12.

The antenna is a modified parabolic reflector with a cosecant squared pattern and an antenna gain of 34 dBi. The trailing edge of the antenna pattern is about 30°. A tunable magnetron type DX276 was used in the transmitter. The pulse repetition frequency was six times staggered or could be manually adjusted to a fixed value.

The ASR-7 was replaced by the ASR-11 until 2010.