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Trawl Unit
The Trawl Unit is made up of several components, including the Sonar Head, enclosed in a
Deployment Pack.
In addition to the FM90 Sonar Head, the Trawl
Unit includes the third-wire extension whip
and hydrophone(s). Mounting shackles on the
Deployment Pack aid in attaching the Trawl
Unit to the net. An access panel provides easy
access to the third-wire whip and strain-relief
block, minimizing the need to open the
Deployment Pack.
The Trawl Unit contains an aft-looking catch
hydrophone to communicate with your catch
monitoring sensors. An optional forward-looking PI hydrophone communicates with
sensors mounted on the trawl door, if you have any. The Trawl Unit is attached to the third
wire, which carries sonar data to the Processor Unit.
Third-wire trawl cable
The third-wire trawl cable carries data from the Sonar Head to the Processor Unit. The
third-wire trawl cable is not part of the delivery. It must be provided by the installation
shipyard or the client.
The third-wire trawl cable is chosen for maximum mechanical strength, durability and
minimum attenuation of the signals. Cables in common use are coaxial with breaking points
of 1500 and 6000 kg.
Important
Your third-wire installation must follow the best practices for EMC compatibility to
minimize electromagnetic interference and ensure optimal performance of the FM90 system.
Related topics
Содержание FM90
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