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MR-331

Description of the radar set, tactical-technical characteristics

Figure 1: MR-331

Figure 1: MR-331

Specifications
frequency: X-band)
pulse repetition time (PRT):
pulse repetition frequency (PRF):
pulsewidth (τ):
receiving time:
dead time:
peak power: 200 kW
average power: 100 W
instrumented range: 40 NM (≙ 74 km)
range resolution:
accuracy:
beamwidth:
hits per scan:
antenna rotation: 4 or 12 rpm
MTBCF:
MTTR:

MR-331

MR-331 “Rangout” (Cyrillic: МР-331 «Рангоут», “Spar” NATO reporting name: “Square Tie”) was operating in the X-band naval radar used by small ships for navigation, air and surface search, and target acquisition for surface-to-surface misiles of type P-15 Termit (NATO reporting name: “Styx” or SS-N-2).

With this radar, the anomalous propagation of electromagnetic waves in X-Band was accidentally discovered in the early 1970s as ducting in the layer of extremely high humidity just above the ocean surface,[1] similar to the Italian MM/TPS-755.

The radar was replaced by the 3Ts-25E Garpun (NATO reporting name: “Plank Shave”) starting in 1989.

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