Simrad FS20 User manual

FS 20/25 OPERATORS MANUAL
901-10037001
Issue 1.1 June 2002

FS 20/25 Operators Manual 901-10037001/1.1
List of Contents Page 1
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
Kongsberg Simrad Mesotech Ltd
Products Warranty Policy
Effective January 1, 2002
Kongsberg Simrad Mesotech Ltd. Warrants each new product (equipment) to be
free of defects caused by faulty materials or poor workmanship for a period of twelve
(12) months for underwater equipment and twenty-four (24) months for surface
equipment from date of installation by an authorized Kongsberg Group Company,
Simrad Distributor, Dealer or Agency. The warranty does not apply to defects
caused by, force majeure events or misuse, including water damage to the surface
equipment, improper maintenance and installation, including excessive wear and
tear for which Kongsberg Simrad mesotech Ltd. Is not responsible.
Underwater Equipment:
•Warranty for underwater Equipment that is hull mounted such as those
mentioned below will be assessed on a case-by case basis but shall generally
not be covered by the warranty.
1. Hull Units, Soundomes assembly and echo sounder transducer
2. Transducer unit, speed, temperature and depth sensors
NOTE: Additional expenses connected with replacement of transducers, such as
dry- docking and diving, is not covered by this warranty.
Warranty on Parts or Equipment Replacement:
•It is at the sole discretion of Kongsberg Simrad Mesotech Ltd. to either repair or
replace any unit/part that fails within the limits of the Warranty Policy.
•The Warranty Policy is only valid on new equipment: Replacement of parts,
components, and/or PCB Boards during a warranty repair does not extend the
original warranty period.
Consumable Materials:
•Consumable materials, such as lamps, fuses, o-rings, gasket and batteries, shall
not be replaced free of charge.

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Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
Warranty Service:
•Warranty service is available worldwide through authorized Kongsberg Group
Companies, Simrad Distributors, Dealers or Agencies. When requesting
warranty service, you must supply the following information:
1. Proof of purchase.
2. Equipment part number and serial number.
3. Fault description and all relevant vessel information.
•Labour cost for the repair or replacement of any products/equipment and/or
module/parts is the responsibility of the servicing agent or dealer.
•All customs, duties, brokerage charges and local taxes, overtime, expenses for
meals, tools, launch services, ferries, lodgings, normal adjustments and routine
maintenance are not covered by this warranty policy.
DISCLAIMER
•Maximum liability shall not, in any case, exceed the contract price of the products
claimed to be defective.
•Consequential damages including, but not limited to, any loss of profit, property
damage or personal injury, are not covered by the warranty policy.

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Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
LIST OF CONTENTS
Part 1...........................................................................................System Familiarization
Part 2...............................................................................................Theory of Operation
Part 3..................................................................................FS 20/25 System Operation
Part 4.....................................................FS 20/25 Installation, System Set-Up and Test
Part 5........................................................................Troubleshooting and Maintenance
Part 6................................................................................................................Drawings
Part 7...........................................................................................................Attachments

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Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada

FS 20/25 Operators Manual 901-10037001/1.1
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Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
MODIFICATION RECORD
FS 20/25 OPERATORS MANUAL
901-10037001
Issue: 1.1
June 2002
Issue
No. Date Initial Comments
1.1 06.02 L.F. Second Release
1.0 05.00 L.F. First Release
To assist us in making improvements to the product and this document, Kongsberg
Simrad Mesotech welcomes comments and constructive criticisms. Please send all such
comments, in writing or by e-mail, to:
Kongsberg Simrad Mesotech Ltd.
Documentation Department
1598 Kebet Way
Port Coquitlam, BC V3C 5M5
CANADA
E-mail: [email protected]

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Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada

FS 20/25 Operators Manual 901-10037001/1.1
System Familiarization Page 1.1
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
PART 1
SYSTEM FAMILIARIZATION
1. SYSTEM FAMILIARIZATION..........................................................................1.3
1.1 OVERVIEW .................................................................................................1.3
1.1.1 Equipment Configuration ......................................................................1.3
1.1.2 System Configuration............................................................................1.4
1.1.3 Display Monitor.....................................................................................1.5
1.1.4 Processor Unit......................................................................................1.5
1.1.5 Power Supply/TTM Interface Module....................................................1.5
1.1.6 Deployment Housing Unit .....................................................................1.6
1.1.7 Jointing Tool.........................................................................................1.6
1.1.8 Catch Sensors......................................................................................1.6
1.1.9 Printer Option........................................................................................1.6
1.1.10Sounder Option.....................................................................................1.7
1.1.11VCR Option...........................................................................................1.7
1.1.12Trawl Cable, Winch and Block..............................................................1.7

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1. SYSTEM FAMILIARIZATION
1.1 OVERVIEW
The SIMRAD FS 20/25 Series is a third wire trawl monitoring system for pelagic and
bottom fishing trawlers. The system provides real time images from the trawl sonar
head and data from the sensors to the bridge, thus maximizing the quality of the
catch and reducing sea time.
The FS 20 vertical trawl sonar allows the operator to see the complete net opening
and operation, by displaying individual fish targets in the vertical plane, the fish
school location, bottom/net location and net geometry. In addition to the vertical
monitoring, the FS 25 horizontal scanning trawl sonar allows the operator to see and
display the fish behavior ahead of the trawl, around the trawl opening, and look at
the cod end of the trawl. The FS 25 also allows the operator to measure the spread
of the trawl door, view and skim banks to avoid reefs and locate boulders on the
ocean floor that may damage the trawl net.
The sonar beam can be horizontally trained 360°. The automatic search features
and full 90° tilt capability ensures maximum control during the tow. The active
motion compensation for pitch and roll comes as standard features.
The addition of the trawl system’s sensor module will allow the operator to monitor
trawl depth, water temperature and receive information from up to 4 catch receivers
indicating when the cod end fills up with fish.
The FS Trawl Sonar Series is a modular system. It is operated with ease through
direct access PC Mouse and Keyboard operated menus. The major benefit of the
third wire trawl sonar system is that it prevents the loss of communication with the
trawl as the vessel is changing course.
1.1.1 Equipment Configuration
A complete Trawl Monitoring System consists of:
•Simrad LCD or VGA display monitor.
•FS 20/25 HP PC Processor.
•FS 20/25 PWR/TTM Interface Module
•TS 15, Vertical 120kHz, 330kHz, 675kHz Trawl Sonar Head
•FS Sensor Module 1800m
•FS 925, 90 kHz Horizontal Scanning Sonar Head
•Deployment Housing and Installation materials
•2
nd Remote Station, Catch Sensor, Color Printer, and VCR (optional)
These components are described in the following sections.

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1.1.2 System Configuration
FS 20/25 330 kHz Trawl Monitoring
System Configuration
Optional
LCD MONITOR OPTIONAL 2ND LCD MONITOR Optional LCD MONITOR
Keyboard Keyboard
TS15 330 kHz Head
FS 3300 Sensor
DGPS
NMEA IN/OUT
OPTIONAL 2ND
LCD MONITOR
901-10050000
FS20/25 HP/PC
Processing Unit
901-10060000
FS20/25 HP/PC Optional
Remote Processing Unit
901-60040000
FS20/25 PWR/TTM Unit
974-80010000
FS900/925 Housing
974-25050000
90 kHz Cone Head
974-24030000
971-80090000
Optional Catch
Receiver
436-00410000 Test Cable
SIMRAD FS 20/25
144-0217
RS 232 Cable
PC
Mouse PC Mouse
Optional
110/240 vac
Imput
Remote KeyPad
805-00030000 Remote KeyPad 805-00030000
TS15S 330kHz Head
200 kHz Net Sounder
Option
974-24050000

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1.1.3 Display Monitor
The display monitor for the FS 20/25 HP PC processor can be either a VGA “CRT”
or LCD Simrad ruggedized monitor, but any commercially available monitor may be
used. In order to have the full benefit of high resolution provided by the video Multi-
Display adapter available with the FS processors, you should use a Simrad LCD
Monitor.
1.1.4 Processor Unit
The FS 20/25 Series HP PC is the control unit for the system. The installed FS
20/25 system software processor provides a mechanism for the sonar head
detection, setup and operation. It is operated through the Main Control panel to
enable the Sonar selection, tilt, range, gain, cursor, and by moving the mouse
pointer over the toolbar will allow the operator to perform certain operations with a
simple mouse click. A Remote Keypad is also available to simplify the operation of
the system.
The sector heading and width are also controlled by a single mouse click used to set
the center of the area to be scanned and the width of the sector scan, up to 360°, in
the polar mode.
The rear panel of the HP PC contains the connectors for AC power, Dual Monitor
port, or output for VCR recording, Serial A, Serial B port, Keyboard, Mouse, and
Printer, and Network port. The Network port can be used to connect the remote
workstation. Note: A security key (or “dongle”) must be attached to the parallel port
to enable full operation of the system.
1.1.5 Power Supply/TTM Interface Module
The FS 20/25 power supply assembly provides the high voltage required by the trawl
sonar. The DC output voltage is combined with the telemetry signals, and supplied
to the trawl sonar.
The long line power supply voltage and current are monitored by a voltage and
current meter, a selector switch located below the voltage meter can be used to
select the output voltage of the power supply required for the appropriate system
configuration. Also, a separate on/off switch is located in the front panel. Note: The
main on/off switch and fuse are located on the rear panel of the TTM Module.
The TTM assembly is the interface that provides translation between the PC serial
port and the sonar telemetry communication protocol.

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1.1.6 Deployment Housing Unit
The trawl deployment housing unit is made from polyurethane and designed for the
harshest of environments, yet it is easy to handle. The FS 20/25 trawl unit contains
the vertical sonar head, the horizontal scanning trawl sonar, the temperature and
depth sensor module and the catch receiver. The mounting kit supplied contains the
strain relief and other hardware for attaching the trawl cable to the trawl headrope.
The trawl cable is connected to the trawl sonar by a watertight connector and a
locking sleeve. Commands are sent down the cable from the processors to operate
the sonar. The sonar image and sensor data are sent up the cable to the processor
and displayed on the appropriate monitor.
1.1.7 Jointing Tool
Jointing tools and materials are required for splicing the trawl cable and attaching
the trawl “pigtail” connector to the trawl sonar. Simrad supplies jointing tool kits
especially designed for coaxial cable with a breaking point of 1500kg. The jointing kit
will allow you to make 10 cable joints.
1.1.8 Catch Sensors
The catch sensor “eggs” are wireless sensors mounted on the cod-end of the trawl
net to detect the stretch of the net as it fills up with the catch. When sufficient stretch
of the net occurs, the catch sensor sends an acoustic signal to the trawl sonar
sensor module through the catch receiver.
This information is then sent to the processor and displayed on the monitor.
The sensors are of a rugged construction in order to withstand the strain from
winches and the power block. The operator can use up to four sensors
simultaneously. The catch sensors are equipped with rechargeable batteries.
1.1.9 Printer Option
A parallel output port is available on the rear panel of the HP PC processor unit for
connecting a HP DeskJet color printer. This option allows hard copies of the Sonar
images to be printed using another software application “PC Paint”.

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1.1.10 Sounder Option
The FS 20/25 HP PC is configured to output NMEA 183 data information. When a
sensor module is included in the system, the depth and temperature output are
transmitted to the processor and displayed on the monitor. When interfaced to the
Simrad EQ 55 or ES 60 color sounder, the headrope and the footrope information
appears on the sounder, showing the location of the trawl in relation to the fish or
bottom returns.
1.1.11 VCR Option
The FS 20/25 HP PC processor video adapter provides S-Video and NTSC
composite video output. This allows the operator to record the sonar image by
connecting a VCR, instead of the second monitor, on the video output “2” using the
special adapter cable included with the system.
1.1.12 Trawl Cable, Winch and Block
The trawl cable is chosen for maximum mechanical strength, durability and
maximum attenuation of the signals. Cables in common use are coaxial with
breaking points of 1500kg. and 6000kg.
Cable winches are delivered in different types and with different capacities; low-
pressure hydraulic, high-pressure hydraulic and electrically driven. Choice of winch
is dependent on prevailing conditions; type and length of cable and available source
of power. Most types operate automatically - the cable is pulled out, kept tight during
towing, and hauled in together with the trawl. Control of the winch is done remotely
from the bridge.
Any commercially available pulley block may be used to properly align the cable
onto the winch. A snatch block has the advantage that it may be installed without
having to thread the cable through it. A unit with two movable steering arms (one on
each side of the pulley) is recommended to prevent the cable from coming off the
pulley and causing damage to the cable.

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FS 20/25 Operators Manual 901-10037001/1.1
Theory of Operation Page 2.1
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
PART 2
THEORY OF OPERATION
2. THEORY OF OPERATION..............................................................................2.3
2.1 INTRODUCTION.........................................................................................2.3
2.1.1 Basic Principles ....................................................................................2.3
2.1.2 Determining Target Position .................................................................2.3
2.1.3 Forming an Image.................................................................................2.3
2.1.4 Key Feature Setting..............................................................................2.4
2.1.4.1 AGC...............................................................................................2.4
2.1.4.2 RCG ..............................................................................................2.4
2.1.4.3 RX Gain Response and Type........................................................2.5
2.1.4.4 Pulse Length Control.....................................................................2.5
2.1.4.5 Optimize Resolution.......................................................................2.5
2.1.4.6 Maximize Range............................................................................2.5
2.1.4.7 Peak Detection..............................................................................2.6

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2. THEORY OF OPERATION
2.1 INTRODUCTION
This section explains the theory of operation of the Vertical and Horizontal Scanning
Trawl Monitoring Sonar System.
2.1.1 Basic Principles
•Sound waves travel very efficiently through water.
•A sound pulse can be projected through water in a controlled direction with the
sonar transducer.
•An object in the path of the projected sound pulse will reflect some sound pulse
back toward the sonar transducer.
•The speed of the sound pulse projected through the water can be predicted for
given conditions.
2.1.2 Determining Target Position
The trawl scanning sonar processor measures the time from the start of the sound
pulse projected through water, to the reception of the sound pulse reflected back to
the sonar transducer. The measured time is then converted to distance by using
value of sound speed through water.
Since the sound pulse is projected in a known direction, the bearing of the reflected
object is also known. This makes it possible to locate the object with respect to the
sonar transducer; the information will be used to plot the position of the reflected
target on a video graphic display monitor.
2.1.3 Forming an Image
The sound pulse projected will be attenuated as it travels through the water from the
transducer to the target and back. Much of this attenuation is a predictable function
of the total time or the distance the sound pulse traveled through water. Increasing
the receiving gain with time can compensate for this decrease in the signal level.
This is done automatically in the sonar with a Time Varying Gain circuit.

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After the TVG correction, the absolute levels of the received signals will be
determined by the acoustic response of the reflecting target.
The sonar processor system repeatedly measures the TVG corrected target levels
by digitizing a sequence of samples after each sound pulse transmission. Each
sample is then plotted on the video display at the appropriate position according to
its range and bearing. The level of the target strength sample determines the color
used to plot each sample.
The process can be repeated with the transducer pointed in different directions,
forming an image of a large area of the bottom, (or the trawl net geometry) and
displaying it on the video screen.
In simple word, the TVG function controls the gain of the receiver so that a school
with a given size and density is presented with approximately the same strength on
the display, inside the regulated TVG range. This can also be seen as a filter,
because it reduces he noise close to the vessel.
2.1.4 Key Feature Setting
The following paragraph will explain some of the key feature of the FS 20/25 System
performance.
2.1.4.1 AGC
Automatic Gain Control (AGC)
The AGC “Automatic Gain Control” algorithm increases the gain during the low
acoustic return and reduces the gain during strong acoustic returns. The speed with
which the gain is adjusted is determined by the setting of the “RX Gain Response”
as explained in paragraph 1.1.4.3
2.1.4.2 RCG
Reverberation Control Gain (RCG)
The RCG filter senses the noise level (reverberation, propeller noise, etc.), and
adjusts the gain of each the received beams in order to eliminate noise on the
display. The strength of the filter can be selected in the menu. With maximum
strength selected, the RCG will effectively reduce the bottom in shallow water, while
variation on the bottom will be displayed.