User manual SIMRAD TRANSCEIVER UNIT OUTLINE SCHEMA REV A

[. . . ] The information contained in this document is subject to change without prior notice. Simrad AS shall not be liable for errors contained herein, or for incidental or consequential damages in connection with the furnishing, performance, or use of this document. The equipment to which this manual applies must only be used for the purpose for which it was designed. Improper use or maintenance may cause damage to the equipment or injury to personnel. [. . . ] On the starboard side of such vessels a purse seine hydrophone can be installed together with a trawl hydrophone. · Hydrophones should have and unobstructed "view" of the sensors attached to the gear, but not be located in the line-of-sight of the main propeller. · Hydrophones should be located aft of echo sounder transducers or sonar installations, preferable at a distance of two meters or more. A proximity of less than one meter should be avoided and hydrophones should never be subject to their direct (frontal) transmission. · Objects protruding from the hull will generate noise, the areas aft of which should not be used to mount hydrophones. · Thruster tunnels generate air bubbles which disrupt signals from the sensors. The areas aft of thruster tunnels or other sunken areas of the hull should not be used to mount hydrophones. · If there is any doubt about the fore-and-aft positions for the hydrophones, they should be located at different distances from the bow (three to five meters relative to each other for a thirty-five meter vessel). The hydrophone that is closest the main propeller should be located on the port side of the vessel. · Hydrophones have a horizontal coverage of approximately 50 degrees. To maximise coverage using two hydrophones they should be offset preferably 20 degrees outboard. (A) = Port hydrophone tilted 20 to 35 degrees (B) = Starboard hydrophone tilted 10 to 20 degrees The hydrophone closest to the main propeller should be on the port side of the hull and have the greater tilt of the two, approximately 20 to 35 degrees. The hydrophone on the starboard side of the hull should be tilted approximately 10 to 20 degrees Note: The "tilt angle" is measures from the vessel's water-line toward the bottom when in operation. A vessel's hull and keel are normally not parallel with the water-line and/or the bow may lift when trawling. These factors must be noted and taken into consideration when deciding on the best possible hydrophone configuration for a given vessel. Refer to the theoretic penetration depth table for more information. Hydrophones have a vertical beam width of 30 degrees and should be tilted so with regard to optimizing system performance at the particular trawl depth in use. This configuration should be decided upon before hydrophone installation commences. 851-165187 / Rev. A 93 Simrad TRANSCEIVER UNIT OUTLINE Simrad recommends that hydrophone tilt be preferably 20 degrees for normal trawling. If the vessel plans to operate in deep water the tilt can be increased to approximately 30 to 35 degrees or reduced to 10 degrees if trawling will be performed at or near the surface. Should a vessel need to operate in both deep and shallow waters two hydrophones be employed, each tilted preferably 15 and 30 degrees respectively. Theoretic penetration depth table Tilt 10 deg 15 deg 20 deg 25 deg 30 deg 35 deg Distance in meters 250 50 70 90 120 150 175 500 100 150 180 225 300 350 750 150 200 275 350 450 525 1000 175 250 350 450 575 700 1250 225 350 450 600 700 875 1500 250 400 550 700 850 1050 1750 300 450 650 800 1000 1200 2000 350 535 750 925 1150 1400 Theoretic penetration depths for hydrophone beams The table shows the theoretical penetration depths for hydrophone beams (measure from their centres) with regard to different tilt angles and varying distances to the sensors. Recommendations: · Normal trawling: approximately 20 degrees · Deep sea trawling: 30 to 35 degrees · Shallow water trawling: 10 to 15 degrees. 94 851-165187 / Rev. A Trawl hydrophone installation Mounting arrangement The TRANSCEIVER UNIT OUTLINE trawl hydrophones are delivered ready for installation in either freestanding or keel mounted shoes (which are to be built by the shipyard responsible for the installation). Several alternatives with corresponding detailed drawings have been included in this manual to cover the majority of installation options available. [. . . ] - A small dialogue opens, as the program will unpack the installation files to a dedicated directry. Create or select a dedicated directory for the installation files. Click Ok to continue. 3 4 5 6 7 8 9 10 Allow the installation files to unpack to the chosen directory. Click the Start button at the lower left corner of your computer display, and select Run. [. . . ]