950-70017001/Iss 1.2
EQ-55 Operators Manual
Page 3.6
Principles of Operation of an Echo Sounder
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
Figure 3.3
A representation of a transducer beamwidth
The center of the sound beam is the most intense, then as you move out towards
the sides of the sound beam there is a point where the intensity of the sound is
1/2 what it was in the center. The distance moved is the "beamwidth". It is
nothing more than a number telling you if your transducer is functioning more
as a spotlight (a narrow beamwidth) or as a floodlight (a wide beamwidth) See
figure 3.3
A narrow beamwidth transducer will do a better job of showing two separate fish
schools that are close to each other (see figure 3.4), whereas a wider beamwidth
will tend to show them as one large school (see figure 3.5). Since a narrow
beamwidth transducer focuses the sound better, it is usually capable of seeing
deeper targets than the wider beamwidth transducer.
Summary of Contents for EQ 55
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