Transducer
The Transducer heading in the Numerical field contains information related to the transducer in use on the relevant channel. In this context, the phrase channel is used as a common term to identify the combination of transceiver, transducer and operating frequency.
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Description
The following information is provided under the Transducer heading.
•  Frequency
This value is the operating frequency of the specific channel.
•  Beamtype
The Beam Type parameter defines the transducer configuration used (single beam, dual beam and split beam). Single-beam and split-beam transducers are available.
•  Gain
This value shows the transducer gain (in dB) for the specific operational frequency.
•  Nominal sA correction
Nominal sA correction for 1.59 dB. Hanning pulse shape.
•  2–way beam angle
The equivalent two-way beam angle is the solid angle at the apex of the ideal beam, which would produce the same echo integral as the real transducer when targets are randomly distributed in space. The units for this angle is Steradians.
•  Angle sensitivity
The sensitivity measure is like a volume control on a hearing aid, its the ability of the sonar to receive echoes. The angle sensitivity is set both along ship and athwartship.
•  Offset
These parameters identify the alongship and athwartship offset angles for the transducer. These offset angles are taken from the calibration results.
•  3dB Beamwidth
This value shows the transducer beamwidth (in degrees) for the operating frequency. The value refers to the one-way Rx beam opening.