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The AN/SQS-30 was a modification of the AN/SQS-4 Mod 2 active/passive search and attack sonar (see separate database entry). The set, intended for surface anti-submarine ships, was upgraded with Rotating Directional Transmission (RDT) that used the transducer to emit a series of intense beams to increase the sonar's range. The sonar also used the Acoustic Short-Pulse Echo Classification Technique (ASPECT) that sends several very short pulses that resolve the target into...

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