BQR-2 — From out of the Deep to target. Perfect

General

Short name	BQR-2
Type	Hull
Platform	sub
Generation	1
Frequency band	MF
Array type	C
Max tracks	1

Ranges

Passive range (km)	1.3

Passive sonar

Passive frequency	7,500.0
Passive DI (broad)	27.5
Passive DI (narrow)	27.5
Passive DT	-13.0
Display type	bqr2

Physical

Height (m)	1.00
Diameter (m)	1.73
Transducers	180

Notes

Remarks	American copy of the GHG sonar taken from captured German Type XXI U-boats; the most advanced passive sonar of its time for post-WWII submarines (circa 1956).36 It can operate in either searchlight or scanning mode and includes forty-eight 3-foot vertical elements in a 6-foot diameter circle and a 5-foot high dome. It has an 18-degree beam, operating between 500 cycles and 15 kHz. While the German GHG was used like a searchlight (i.e. with the beam turned in a certain direction to listen), the U.S. BQR-2 added a commutator operating in the 5 to 9 kHz range, which either scanned continuously at 4 RPMs or was tracked by the Bearing Direction Indicator (BDI).

Remarks

American copy of the GHG sonar taken from captured German Type XXI U-boats; the most advanced passive sonar of its time for post-WWII submarines (circa 1956).36 It can operate in either searchlight or scanning mode and includes forty-eight 3-foot vertical elements in a 6-foot diameter circle and a 5-foot high dome. It has an 18-degree beam, operating between 500 cycles and 15 kHz. While the German GHG was used like a searchlight (i.e. with the beam turned in a certain direction to listen), the U.S. BQR-2 added a commutator operating in the 5 to 9 kHz range, which either scanned continuously at 4 RPMs or was tracked by the Bearing Direction Indicator (BDI).