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The AN/SQS-4 was a long-range active/passive, search and attack sonar. It was the first major long-range sonar to be designed after World War II, and was the basis from which several subsequent US sonars were developed.

The operating frequency was 14 KHz, with selectable pulse lengths of 6, 30, or 80 milliseconds and respective power outputs of 50, 30, and 10 kW. Range scales were 1,000, 2,500, 5,000, 10,000, and 15,000 yards (914, 2,286, 4,572, 9,144, and 13,716 m). The sonar...

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