Preparing the fourth-wire cable
Before you can connect the Camera Unit to the Communication Hub in the Trawl Unit, you need to prepare the fourth-wire cable for use.
Prerequisites
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•  A non-stretchable rope (such as Spectra® or Kevlar®) with the same length as the fourth-wire cable.
•  Duct tape
•  Eight-inch strain relief
Context
The fourth-wire cable connects the Camera Unit to the Communication Hub inside the Trawl Unit. On larger trawls, this cable can be very long.
The fourth-wire cable is provided by Simrad.
Procedure
1 Attach the rope to the fourth wire cable using duct tape approximately every one meter.
2 Make sure that the total length of the rope is shorter than the length of the fourth wire cable.
This will allow the rope to take up the tension.
3 Roll up the fourth-wire cable onto a separate drum.
Important
Make sure that the block is sufficiently dimensioned to allow the fourth wire to run undisturbed through it during deployment and retrieval. The block diameter should be at least thirty times the cable diameter.
4 Tie the other end of the rope to the eight-inch strain relief.