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Type 80

Description of the radar set, tactical-technical characteristics

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Figure 1: Illustration from the technical manual

frequency: 2 980 … 3 020 MHz
pulse repetition time (PRT): 3.7 ms
pulse repetition frequency (PRF): 235 … 300 Hz,
nominally: 270 Hz
pulsewidth (τ): 2 or 5 µsec,
standard 2 µsec
receiving time: ca. 3.4 ms
dead time: 240 µs
peak power: 1 MW, later 2.5 MW
average power:
instrumented range: 200 NM (≙ 370 km)
range resolution:
beamwidth: 0.35°
hits per scan:
antenna rotation: 4 or 6 rpm

Type 80

The AMES Type 80 (or Green Garlic) was a powerful early warning and ground-controlled interception radar developed in the late 1940s by the Telecommunications Research Establishment and built by Marconi (later p/o Decca) for the Royal Air Force.

The radar used a 75 by 25 foot (22.9 m × 7.6 m) “Single Curvature” parabolic reflector made of wire mesh. The antenna provided a cosecant-squared pattern. The squintless feeding by a linear array caused minor side lobes.

The first radars of Type 80 became operational in 1955. A total of about 35 Type 80s were built. In the late 1960s, the Type 80 radars were replaced by Type 84 and Type 85 radars. Outside the United Kingdom, it was replaced by the AN/FPS-7.

Picture gallery of the Type 80 radar

Picture 2: Back side of the radar antenna

Picture 3: Mercury vapor rectifier