AN/SPG-49

The AN/SPG-49 was a C-band (5,400–5,900 MHz) naval fire control radar developed in 1947 for the U.S. Navy's RIM-8 Talos shipboard air defense systems. It featured a three-gimbal system (azimuth, elevation, and traverse) for hemispheric scanning and tracking, and combined a monopulse tracking radar with a continuous wave (CW) illumination radar in a single antenna. The antenna, with an 110-inch diameter lens aperture and fiberglass radome, used a Foster Scanner feeding a folded reflector. For target acquisition, the radar emitted 3 MW pulsed bearing and azimuth sweeps to determine range, bearing, and altitude, achieving an instrumented range of 150 nautical miles (275 km) and a range resolution of 150 feet. Once acquired, it switched to a 3 MW pulsed narrow-beam monopulse tracking mode. When a missile approached a target, the antenna also radiated a 5 kW CW illumination beam, carrying target identification information for missile guidance. The AN/SPG-49 became obsolete with the Talos system at the end of 1979.

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