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491 INSTALLATION MANUAL Revision A PAGE 1
SECTION ONE — Introduction
Welcome to
the Northstar
491
An echo sounder is a device that provides information about the water
directly beneath a vessel. The Northstar echo sounder system consists of:
•
the Northstar 491 echo sounder sensor
•
a Northstar navigation system such as the 962, 958 or 6000i
•
a transducer
The 491 can be used with either a single-element transducer or a
dual-element transducer. The 491 automatically pings both transmitters
at power-up to determine the number of transducer elements connected.
If a single element is detected, the 491 operates in single-frequency or
dual-frequency interleaved mode (as determined by the operator) at 600
Watts. If two elements are detected, the 491 uses both elements at 1000
Watts.
Installation and setup procedures are different for the two basic types of
Northstar navigators. The following terminology should be carefully fol-
lowed:
•
the term
961/962
indicates instructions that apply to the Northstar
961 and the 962 navigators
•
the term
957/958/6000i
is used for these units
•
the term
navigator
by itself identifies information that applies to all
units
Who should
read this
manual
This manual is for marine technicians who are installing the Northstar
491 and connecting it to a Northstar navigator and a transducer.
Scope of this
manual
In this manual, you’ll find information about the following:
•
mounting and wiring the 491
•
connecting the 491 to the Northstar navigator
•
installing a transducer (an overview is provided, but for such details
as wiring, see the documentation provided by the transducer’s man-
ufacturer)