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Country of Origin: USA


The AN/BQS-4 is an active/passive detection sonar. It consists of the AN/BQR-2 passive detection system with an added active detection capability.

The BQS-4 active component consists of seven vertically stacked cylindrical transducers located inside the BQR-2 chin bow dome, through which the BQS-4 transmits its active "pings."

In addition to passive listening, the sonar can operate in either automatic echo-ranging or "single-ping" modes.


Initial operational capability (IOC)...

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