The Pacific War Online Encyclopedia
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Also known as QC/JK, this American sonar had both active (QC) and passive (QC/JK) capability. It used two heads lowered from wells at the aft end of the forward torpedo room. Each head used a powerful magnetorestriction transducer for QC and a sensitive Rochelle salt transducer for JK. The active system was equipped with a telegraph key for underwater communication.
The technology became standard equipment on American submarines in 1938 and was used
throughout the war.
References
Friedman (1995)
Historical
Naval Ships Association (accessed 2009-11-25)
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