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Nisgeis · 02-06-12, 01:12 PM

The early war fleet boats with the WCA gear had four sonars underwater:

QC/JK - QC for echo ranging and the JK for passive listening. I believe the JK was ultrasonic and not so good for long distance (but quite good on bearing accuracy). Could not be used at the same time as they are mounted on the same head on reciprocal bearings.

QB - echo ranging with a wider frequency band than the QC

NM - Echo sounding equipment.

Note 'Q' is for a range projector/listener and 'J' is a passive listening device and 'N' is an echo sounding device (for depth).

They also had JP in the Forward Torpedo Room and the head was above the waterline and was in the sonic range. JT sonar, which was a later version had better bearing precision as it received both sonic and ultrasonic and a few extra features. Need to be submerged to use these.

EDIT: The sonar manual, advises the operator to continue listening when on the surface when conditions permit, e.g. weather and speed - as has been said previously water rushing over the sonar head drowns out other noise and also sea state plays a part too.

02-06-12, 01:12 PM	#28
Nisgeis Ocean Warrior Join Date: Jan 2008 Posts: 2,909 Downloads: 77 Uploads: 11	The early war fleet boats with the WCA gear had four sonars underwater: QC/JK - QC for echo ranging and the JK for passive listening. I believe the JK was ultrasonic and not so good for long distance (but quite good on bearing accuracy). Could not be used at the same time as they are mounted on the same head on reciprocal bearings. QB - echo ranging with a wider frequency band than the QC NM - Echo sounding equipment. Note 'Q' is for a range projector/listener and 'J' is a passive listening device and 'N' is an echo sounding device (for depth). They also had JP in the Forward Torpedo Room and the head was above the waterline and was in the sonic range. JT sonar, which was a later version had better bearing precision as it received both sonic and ultrasonic and a few extra features. Need to be submerged to use these. EDIT: The sonar manual, advises the operator to continue listening when on the surface when conditions permit, e.g. weather and speed - as has been said previously water rushing over the sonar head drowns out other noise and also sea state plays a part too. __________________ -------------------------------- This space left intentionally blank.