ES18 Connecting to a 12-pin Amphenol socket
The Simrad ES18 is a split-beam transducer designed for fish finding and underwater science applications. The transducer is connected to terminals A through N on a circular 12-pin Amphenol socket (Type 97-12-19S). This socket is used on the General Purpose Transceiver (GPT), and on several versions of the Wide Band Transceiver (WBT).
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The other end of the cable is permanently fixed to the transducer.
The transducer is designed with the individual elements organized in four separate sectors. It is very important that the transducer is correctly installed with the sectors positioned as shown in the illustration (seen from above). Each sector is connected to a dedicated transceiver channel. In this context, the phrase transceiver channel is used to describe one single pathway through the transceiver. This pathway contains one transmitter, one preamplifier and the necessary transmit/receive switching circuitry.
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Note
We strongly recommend that you install the transducer cable in a steel conduit.
Depending on production date, the transducer can be delivered with two different cable types. On older transducers the cable contains black and white conductors. On new transducers the cable contains colour coded conductors.
Cable with colour coded conductors
Cable with colour coded conductors
Sector Cable colours Terminal on socket Transceiver channel
1 White H 1
Black J
2 Green E 2
Black F
3 Yellow C 3
Black D
4 Blue A 4
Black B
Digital output Red L  
Digital ground Black M
Cable screen Screen N
Cable with only black and white conductors
The cable has four pairs of white and black conductors. The different sectors are defined by small numbers marked with white text on each black conductor. These are numbered 1 to 4 to identify the transducer sectors. The numbers on the black conductors are the same as four sectors as seen in the illustration and table. The different numbers are quite small and you may need a magnifying glass to see them.
Note
Since the white conductors are not numbered, it is very important to find the pairs that are twisted together.
Cable with only black and white conductors
Sector Cable colours Terminal on socket Transceiver channel
1 White H 1
Black J
2 White E 2
Black F
3 White C 3
Black D
4 White A 4
Black B
Cable screen Screen N  
Connecting to the Amphenol socket
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The cable screen must be connected to the housing on the transducer plug.
Note
The black wires in the transducer cable are not for grounding. You must never connect these together. You must never connect any of them to vessel ground.
The software license controls how the transducer is connected to the transceiver. The License Details text box explains which transceiver channels that are used. Each channel available is listed with the relevant operational frequency and power capacity. For more information, refer to the context-sensitive on-line help.
Illustration: The connector is seen from the solder side.
Splicing the transducer cable
If you need to extend the transducer cable, you must splice it correctly. This is very important, as any splice is very vulnerable for noise. Cable can be spliced using two different methods:
•  Splicing using a grounded junction box
•  Splicing using a junction box that is isolated from vessel’s ground
Refer to the dedicated procedures.
Minimum cable requirements
Not applicable. If you need an extension cable, contact your dealer (or Kongsberg Maritime) for support.