NorthStar 490 Echosounder Operation Manual page 10

Chapter 1 - Welcome
Page 1-6
the water and seabed can be displayed and analyzed on the
echo sounder screen. In essence, this system lets you see a
real-time cross section of what's happening underneath your
vessel.
The model 490-S is a 600-watt single channel echo sounder
designed to be used with a transducer having a single ceramic
element capable of 50 and 200 kHz.
The model 490-D is a 1000-watt dual channel echo sounder
designed to be used with a transducer having dual ceramic
elements, one each for 50 and 200 kHz.
Figure 1, "957 echo sounder system components," below, and
Figure 2, "961/962 echo sounder system components," below,
show how the 490 connects to these navigators to enable echo
sounding functions.
2201
antenna
957
Navigator
10-foot cable
(Northstar-supplied)
Figure 1: 957/958 echo sounder system components
490
module
Ship's
Power
10-foot cable
(Northstar-supplied)
490 Echo Sounder Operations Manual Rev. B2
33-foot cable
(part of transducer)
Transducer