BQR-2B

Passive Hull sub Gen 1

General

Short name BQR-2B
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 The BQR-2B version added a second commutator operating in the 700 Hz to 1.4 kHz range that fed a Bearing-Time Recorder (BTR). A piece of paper rolls down past a stylus that moves horizontally, with each pass of the stylus being one full commutator scan. Whenever the received signal reached a certain level, the stylus placed a mark on the paper. Over time, the BTR could be used to estimate a target’s motion and position. The BTR beam could be driven at 1 or 10 RPMs, with the higher one being used for a stronger target signal.37 The BQR-2B has a sound-bearing recorder for 1 to 4 kHz, but it can aurally detect noise at 0.3 to 15 kHz. Automatic target following had an accuracy of 0.25 degrees against a noisy submarine at 12,000 yards.

Fitted on

Submarine classes (29)