Compensating for fourth-wire signal loss
If you need to use a long fourth-wire cable between the Communication Hub and the camera, you may experience signal loss. You can configure the FX80 software to compensate for signal loss.
Context
The Hub Controller page allows you to monitor the status of the Communication Hub in the Trawl Unit. This page also allows you to compensate for signal loss if you need to use a long fourth-wire cable between the Communication Hub and the Camera Unit.
If the Camera Unit is physically located some distance from the Trawl Unit on the headrope, this distance will require a long fourth-wire cable between the two units. On larger trawls, the cable may need to be several hundred meters long.
Unfortunately, a long cable will always result in some signal loss, and such loss is annoying on any video system. In order to compensate for a long cable, the FX80 offers the Long Line Drive parameter. Using this parameter, you can enter the approximate length of the cable, so that the software can compensate automatically.
Important
Do not modify System Setup parameters while you are using Live Feed mode.
Procedure
1 Select the Setup icon.
The icon is located under the Main menu.
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2 Click the System Setup button.
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3 Click the Hub Controller tab.
4 Observe the quality of the live feed and adjust the Long Line Drive parameter to achieve the best possible video quality.
The following options are available.
•  ‘n’ m: Approximate length of fourth-wire cable.
•  1200*m: Special configuration for very long cable.
•  1200#m: Special configuration for very long cable.
5 Select OK to save the selected settings and close the dialog box.