Context
The third-wire trawl cable comprises a core conductor surrounded by a grounding shield. Together, these form a coaxial cable. This coaxial cable is enclosed by a protective jacket and a flexible steel armour.
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Core conductor in the coax cable |
It is very important that this splicing is done properly. The splice must be completely waterproof, and there must be no electrical short between the core conductor and the shield. The quality of this splice is vital for the operational performance of the FX80. There are many different third-wire cables available, and there are also many ways to splice the third wire to the pigtail. This procedure explains one method suggested by Simrad.
The trawl cable enters the Deployment Pack through a dedicated opening, and it is then supported by a strain-relief block
in a special compartment. Both the core conductor and the shield in the third-wire trawl cable are connected to the pigtail provided by Simrad. The other end of the pigtail cable is provided with a watertight plug, which is connected to the Communication Hub. The design will not allow you to plug this into the wrong socket.
ImportantThe third-wire trawl cable must enter the Trawl Unit using an external strain relief with the proper dimensions. This item is not provided by Simrad.