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Description of the radar set, tactical-technical characteristics

Figure 1:

Figure 1: Antenna AS511/SPS-5

frequency: 6 275 … 6 575 MHz
(later: 5 450 … 5 285 MHz)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 683 Hz
pulsewidth (τ): 0.5 µs (later: 0.37 µs)
receiving time:
dead time:
peak power: 285 kW
average power:
instrumented range: 30 NM (≙ 55 km)
range resolution:
beamwidth: 1.75°
hits per scan:
antenna rotation: 5 rpm


Radar Set AN/SPS-5 (XN-1) is medium power, lightweight, high-resolution surface search equipment for installation in Patrol Torpedo boats. It maybe used to detect small craft when close to shore. AN/SPS-5 features narrow pulse width, thyratron keying, a low noise receiver with a sensitivity time control and a fast time constant to clarify target presentation, a large lightweight antenna reflector that provides simultaneous surface search and modified (low altitude) air search, and a regulated high voltage power supply which maintains constant power input to the magnetron oscillator.

In the AN/SPS-5A and -5B the antenna weight has been further reduced by the replacement of antenna AS-511/SPS-5 with antenna AS-651/SPS-5B. There is no provision for elevation of the antenna reflector in the AN/SPS-5A and -5B. The azimuth synchro system of the AN/SPS-5 is normally a double channel system while the synchro system of the AN/SPS-5A and -5B is a single channel system.

The AN/SPS-5C is similar to Radar Sets AN/SPS-5 and -5A except it is modified by Radar Set Group OA-2237/SPS-5C, which provides new operating features, increased performance and a new frequency range 5 450 to 5 285 MHz.

Picture gallery of AN/SPS-5

Figure 2: Overview