Edgetech 4205 User manual

EdgeTech
4 Little Brook Road
West Wareham, MA 02576
Tel: [phone]
Fax: [phone]
www.EdgeTech.com
4205 SIDE SCAN SYSTEM
USER HARDWARE MANUAL
0021769_REV_D 6/22/2020

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4205 SIDE SCAN SYSTEM0021769_REV_D
The information, figures, and specifications in this manual are proprietary. They are issued in strict confidence
on condition that they not be copied, reprinted, or disclosed to a third party, either wholly or in part, without
the prior written consent of EdgeTech. Any reproduction of EdgeTech supplied software or file sharing is strictly
prohibited.
Copyright © 2018-2020 EdgeTech. All rights reserved.
Microsoft Windows© is a registered trademark of Microsoft Corporation
SBG© is a registered trademark of SBG Systems

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ATTENTION – READ THIS FIRST!
All personnel involved with the installation, operation, or maintenance of the equipment described in this
manual should read and understand the warnings and cautions provided below.
CAUTION!This equipment contains devices that are extremely sensitive
to static electricity. Therefore, extreme care should be taken when
handling them. Normal handling precautions involve the use of anti-static
protection materials and grounding straps for personnel.
WARNING!High Voltage may be present in all parts of the system.
Therefore, use caution when the electronics are removed from their
containers for servicing.
CAUTION!Operation with improper line voltage may cause serious
damage to the equipment. Always ensure that the proper line voltage is
used.
Warnings, Cautions, and Notes
Where applicable, warnings, cautions, and notes are provided in this manual as follows:
WARNING! Identifies a potential hazard that could cause injury or death.
CAUTION! Identifies a potential hazard that could damage equipment or
data.
NOTE: Recommendations or general information that is particular to the
material being presented.

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4205 SIDE SCAN SYSTEM0021769_REV_D
HARDWARE VARIATIONS AND COMPATIBILITY
The 4205 Side Scan system contains both standard and proprietary hardware. At times, EdgeTech may
change the standard components due to their availability or performance improvements. Although the
component manufacturers—along with their models and styles—may change from unit to unit,
replacement parts will generally be interchangeable.
EdgeTech will make every effort to see that replacement components are interchangeable and use the
same software drivers (if applicable). At times, however, direct replacements may not exist. When this
happens, EdgeTech will provide the necessary drivers with the replacement part, if applicable.
EdgeTech may also change certain hardware per customer requirements. Therefore, portions of this
manual, such as parts lists and test features, are subject to change. These sections should be used for
reference only. When changes are made that affect system operation, they will be explicitly noted. Also,
some options and features may not be active in the customer’s unit at the time of delivery. Upgrades will
be made available when these features are implemented.
Contact CUSTOMER SERVICE with any questions relating to compatibility.

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ABOUT THIS DOCUMENT
We, the employees at EdgeTech, would like to thank you for purchasing a 4205 Side Scan system. At
EdgeTech, it is our policy to provide high-quality, cost-effective products and support services that meet
or exceed your requirements. We also strive to deliver them on time and look for ways to improve them
continuously. We take pride in the products we manufacture and want you to be entirely satisfied with
your equipment.
Purpose of this Manual
The purpose of this manual is to provide you with information on the setup and use of EdgeTech’s 4205.
Although this manual encompasses the latest operational features of the 4205, some features may be
periodically upgraded. Therefore, the information in this manual is subject to change and should be used
for reference only.
Liability
This content is protected under copyright law, furnished for informational use only, is subject to change
without notice, and should not be construed as a commitment by EdgeTech. EdgeTech assumes no
responsibility or liability for any errors or inaccuracies that may appear in the informational content
contained in this content.
Revision History
REVISION
DESCRIPTION
DATE
APPROVAL
A
Release to Production
2/19/2019
TS
B
Content Updates
7/19/2019
TS
C
Drawing and Text Updates
8/23/2019
TS
D
701-DL, Towfish Pictures, Drawing, Format Updates
6/22/2020
PO

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4205 SIDE SCAN SYSTEM0021769_REV_D
WARRANTY STATEMENT
All equipment manufactured by EdgeTech is warranted against defective components and workmanship
for a period of one year after shipment. Warranty repair will be done by EdgeTech free of charge.
Shipping costs are to be borne by the customer. Malfunction due to improper use is not covered in the
warranty, and EdgeTech disclaims any liability for consequential damage resulting from defects in the
performance of the equipment. No product is warranted as being fit for a particular purpose, and there is
no warranty of merchantability. This warranty applies only if:
i. The items are used solely under the operating conditions and in the manner recommended in
Seller's instruction manual, specifications, or other literature.
ii. The items have not been misused or abused in any manner, nor have repairs been attempted
thereon without the approval of EdgeTech Customer Service.
iii. Written notice of the failure within the warranty period is forwarded to the Seller, and the
directions received for properly identifying items returned under warranty are followed.
iv. The return notice authorizes Seller to examine and disassemble returned products to the extent
Seller deems necessary to ascertain the cause for failure.
The warranties expressed herein are exclusive. There are no other warranties, either expressed or implied,
beyond those set forth herein, and Seller does not assume any other obligation or liability in connection
with the sale or use of said products. Any product or service repaired under this warranty shall be
warranted for the remaining portion of the original warranty period only.
Equipment not manufactured by EdgeTech is supported only to the extent of the original manufacturer's
warranties.
CAUTION! Never attempt to ship a Portable Topside in its Storm CaseTM
alone. Although rugged, these cases are not intended to be used as
shipping containers, and the delicate internal components could be
damaged. Shipping in this manner will void any warranties.

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SOFTWARE SERVICE OVERVIEW
EdgeTech provides software services free of charge. This software agreement does not address customer-
specified modifications or enhancements. These services may be ordered separately. Furthermore,
EdgeTech software upgrades are meant for the sole use of EdgeTech customers. Any reproduction of
EdgeTech-supplied software or file sharing is strictly prohibited.
Software Updates and Enhancements
EdgeTech customers can download new software releases with all modifications and enhancements from
the EdgeTech FTP site. Major software issues, should they occur, will be reported directly to the customer.
New software releases consist of the following:
•Software enhancements that are not on the price list
•Software fixes and changes
•Product integration
•Documentation updates to on-line help
•Tests for compatibility with other modules
Software patches consist of software that has undergone the following:
•Minor software enhancements
•Software fixes and changes
EdgeTech customers are entitled to contact CUSTOMER SERVICE by telephone, facsimile, or e-mail to
report a difficulty, to discuss a problem, or to receive advice on the best way to perform a task. When
contacted, EdgeTech Customer Service will do the following:
•Respond within 24 hours via Telephone, Facsimile, and E-mail Support
•Immediately attend to serious problems affecting operations
•Attempt to find an immediate workaround

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4205 SIDE SCAN SYSTEM0021769_REV_D
RETURNED MATERIAL AUTHORIZATION
Before returning any equipment to EdgeTech, a Returned Material
Authorization (RMA) Number must be obtained from CUSTOMER SERVICE.
RMA Purpose
The RMA Number identifies returned equipment when it arrives at our receiving dock and enables tracking
while at our facility. Refer to the RMA number on all documentation and correspondences.
All returned materials must be shipped prepaid. Freight collect shipments will not be accepted. All
equipment should be adequately insured for shipping, but equipment belonging to EdgeTech must be
insured for full value.
If there is more than one item per consignment, include a packing with the shipment. An invoice can
double as a packing slip only when the contents are clearly numbered and identified on the invoice.
CAUTION! Never attempt to ship a Portable Topside in its Storm CaseTM
alone. Although rugged, these cases are not intended to be used as
shipping containers, and the delicate internal components could be
damaged. Shipping in this manner will void any warranties.
NOTE: All shipping charges shall be the responsibility of the customer,
unless under warranty, as EdgeTech will pay for return shipping.
NOTE: For International Shipments valued over $1000, the following
Shipper's oath must be sent with the invoice.
Shipper’s Oath:
"I, ______________________________, declare that the articles herein specified are the growth,
produce, or manufacture of the United States; that they were exported from the
United States from the port of _____________________, on or about _______________; that they
are returned without having been advanced in value or improved in condition by any
process of manufacture or any other means; and that no drawback, or allowance has
been paid or admitted hereof."
Signed ______________________________

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CUSTOMER SERVICE
Customer service personnel at EdgeTech are always eager to hear from you regarding our products. Your
feedback is welcome and a valuable source of information that we use to improve products. Therefore,
we encourage you to contact CUSTOMER SERVICE to offer any suggestions or to request technical
support:
NOTE: Please have your system Model and Serial Number available when
contacting Customer Service.
E-mail: [e-mail]
Mail: 4 Little Brook Road
West Wareham, MA 02576
Telephone: [phone]
Facsimile: [phone]
24-Hour Emergency
Technical Support Line: [phone]
For more information, please go to www.EdgeTech.com.

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4205 SIDE SCAN SYSTEM0021769_REV_D
COMPANY BACKGROUND
EdgeTech (formerly EG&G Marine Instruments) traces its history in underwater data acquisition and
processing back to 1966. EdgeTech has designed, developed, and manufactured products, instruments,
and systems — for the acquisition of underwater data, including marine, estuarine, and coastal
applications — for over 50 years.
EdgeTech responds to the needs of the scientific, naval, and offshore communities by providing industry-
leading equipment — such as sub-bottom profilers, side-scan sonar, acoustic releases, USBL positioning
systems, and bathymetric systems — that have become standards in the industry.
EdgeTech consistently anticipates and responds to future needs with an active research and development
program. Current efforts are focused on adopting new cutting-edge acoustic technology.

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TABLE OF CONTENTS
ATTENTION – READ THIS FIRST! .......................................................................................................1-3
Warnings, Cautions, and Notes..............................................................................................................1-3
HARDWARE VARIATIONS AND COMPATIBILITY................................................................................1-4
ABOUT THIS DOCUMENT.................................................................................................................1-5
Purpose of this Manual..........................................................................................................................1-5
Liability...................................................................................................................................................1-5
Revision History .....................................................................................................................................1-5
WARRANTY STATEMENT .................................................................................................................1-6
SOFTWARE SERVICE OVERVIEW.......................................................................................................1-7
Software Updates and Enhancements...................................................................................................1-7
RETURNED MATERIAL AUTHORIZATION ..........................................................................................1-8
RMA Purpose .........................................................................................................................................1-8
CUSTOMER SERVICE........................................................................................................................1-9
COMPANY BACKGROUND .............................................................................................................1-10
TABLE OF CONTENTS .....................................................................................................................1-11
LIST OF FIGURES............................................................................................................................1-15
LIST OF TABLES .............................................................................................................................1-17
1.0 OVERVIEW...........................................................................................................................1-19
1.1 4205 Side Scan Sonar System Applications .............................................................................1-20
1.2 Main System Components.......................................................................................................1-20
1.2.1 Topside Processor...............................................................................................................1-20
1.2.2 Towfish................................................................................................................................1-23
1.2.3 Tow Cables..........................................................................................................................1-24
1.3 Optional Equipment ................................................................................................................1-24
1.3.1 SGB Compass ......................................................................................................................1-25
1.3.2 Depressor Wing ..................................................................................................................1-25
1.3.3 Magnetometer Interface ....................................................................................................1-25
1.3.4 Acoustic Tracking System ...................................................................................................1-25
1.3.5 Pressure Sensor ..................................................................................................................1-25
1.3.6 Responder...........................................................................................................................1-25

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4205 SIDE SCAN SYSTEM0021769_REV_D
2.0 SPECIFICATIONS...................................................................................................................2-26
2.1 4205 Sonar Performance Specifications..................................................................................2-26
2.2 Towfish Specifications .............................................................................................................2-27
2.3 4205 Topside Specifications ....................................................................................................2-27
2.3.1 Kevlar Tow Cable Specifications .........................................................................................2-31
2.3.2 Armored Tow Cable Specifications.....................................................................................2-31
2.4 Mechanical Drawings...............................................................................................................2-32
2.4.1 4205 Towfish Drawings.......................................................................................................2-32
2.4.2 Electronic Bottle and Connection Drawings .......................................................................2-34
2.4.3 Cable Drawings ...................................................................................................................2-39
2.4.4 Topside Digital Link Drawings.............................................................................................2-43
3.0 TECHNICAL DESCRIPTIONS....................................................................................................3-46
3.1 Towfish Technical Description.................................................................................................3-46
3.1.1.1 4205 Tri-Frequency & Single Pulse Towfish ...............................................................3-47
3.1.1.2 4205-MPMT Towfish ..................................................................................................3-47
3.2 Topside Technical Descriptions ...............................................................................................3-48
3.2.1 Starmux IV Controls, Indicators and Connections ..............................................................3-48
3.2.2 Starmux IV 4205 Rack Mount Controls, Indicators, and Connections................................3-51
3.2.3 701-DL Controls, Indicators and Connections ....................................................................3-55
3.2.4 701-DL 4205-Rack Mount Controls, Indicators, and Connections......................................3-57
3.2.5 Starmux III Controls, Indicators and Connections ..............................................................3-63
3.2.6 Starmux III-4205 Rack Mount Controls, Indicators, and Connections................................3-65
4.0 SETUP AND ACTIVATION ......................................................................................................4-72
4.1 Unpacking and Inspection .......................................................................................................4-72
4.1.1 Starmux IV Digital Link Systems..........................................................................................4-72
4.1.2 4205 Starmux IV Rack Mount System.................................................................................4-72
4.1.3 701 Digital Link Systems .....................................................................................................4-73
4.1.4 4205 701-DL Rack Mount System.......................................................................................4-73
4.2 Power Requirements ...............................................................................................................4-73
4.2.1 Use of an Uninterrupted Power Supply..............................................................................4-73
4.2.2 Change to a Non-US Power Plug.........................................................................................4-74
4.3 Navigation Interface ................................................................................................................4-74

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4.4 Topside Processor Placement..................................................................................................4-74
4.5 TCP/IP Address Settings...........................................................................................................4-75
4.6 Connecting the System Components ......................................................................................4-75
4.6.1 Connect and Attach the Tow Cable to the Towfish............................................................4-76
4.6.2 Installing a Depressor Wing and Connecting the Tow Cable..............................................4-77
4.6.3 Connecting to the Topside..................................................................................................4-77
4.6.3.1 Connecting to the Starmux IV DL................................................................................4-77
4.6.3.2 Connecting to the 4205 Rack Mount with Starmux III DL ..........................................4-77
4.6.3.3 Connecting to the 701-DL...........................................................................................4-78
4.6.3.4 Connecting to the 4205 Rack Mount with 701-DL .....................................................4-78
4.6.3.5 Connecting to the Starmux III DL................................................................................4-79
4.6.3.6 Connecting to the 4205 Rack Mount with Starmux III DL ..........................................4-80
5.0 ACTIVATION, TEST, AND DEPLOYMENT.................................................................................5-81
5.1 Activating the Topside .............................................................................................................5-81
5.1.1 Activating a Starmux IV System ..........................................................................................5-81
5.1.2 Activating a 701-DL System ................................................................................................5-81
5.1.3 Activating a Starmux III System ..........................................................................................5-82
5.2 Performing Pre-deployment Checks........................................................................................5-82
5.3 Towfish Deployment................................................................................................................5-84
5.4 Towfish Recovery.....................................................................................................................5-85
6.0 MAINTENANCE ....................................................................................................................6-87
6.1 Inspect and Clean the Towfish and Cable after Use................................................................6-87
6.2 Inspect and Clean the Underwater Connectors ......................................................................6-87
6.3 Storage.....................................................................................................................................6-87
6.4 Recommended Spares.............................................................................................................6-87
7.0 TROUBLESHOOTING.............................................................................................................7-88
7.1 Restore the Operating System.................................................................................................7-88
7.2 Disassembling and Reassembling the Towfish ........................................................................7-88
7.2.1 Disassembling the 4205 Towfish: .......................................................................................7-88
7.2.2 Assembling the Tow Vehicle...............................................................................................7-93
7.3 Standard Compass Calibration (AHRS Compass).....................................................................7-93
7.4 Starmux IV Troubleshooting....................................................................................................7-93

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4205 SIDE SCAN SYSTEM0021769_REV_D
7.5 701-DL Digital Link Troubleshooting Guide .............................................................................7-94
7.6 4205 Rack Mount (701-DL with 2U CPU) Troubleshooting Guide...........................................7-96
7.7 Starmux III Rack Mount (Starmux III DL with 2U CPU) Troubleshooting Guide ......................7-96
7.8 Starmux III Digital Link Troubleshooting Guide .......................................................................7-96
7.9 Towfish Troubleshooting Guide ..............................................................................................7-98
7.9.1 Required Equipment...........................................................................................................7-99
7.9.2 Transmission Verification ...................................................................................................7-99
7.9.3 Sonar Processor and Data Link ...........................................................................................7-99
7.9.4 Topside Power Unit ..........................................................................................................7-100
7.9.5 Command and Data Link...................................................................................................7-100
7.9.6 Data Link ...........................................................................................................................7-100
7.9.7 Towfish..............................................................................................................................7-102
7.9.7.1 No Sonar Data...........................................................................................................7-102
7.9.7.2 Reported Errors ........................................................................................................7-102
7.9.7.3 Other Checks ............................................................................................................7-102
7.10 Tow Cable Troubleshooting...................................................................................................7-103
7.10.1.1 Shorted Wire.............................................................................................................7-103
7.10.1.2 Open Wire.................................................................................................................7-103
7.10.1.3 Insulation Resistance Breakdown.............................................................................7-104
7.10.1.4 Damaged Tow Cable Connector ...............................................................................7-104
A.0 4205 KITS ........................................................................................................................ A-105
A.1 4205 MPMT Spare Kits ......................................................................................................... A-105
A.2 4205 Tri-Frequency Spare Kits.............................................................................................. A-106
A.3 Tool Kits ................................................................................................................................ A-107

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LIST OF FIGURES
Figure 1-1: Starmux IV Rackmount with Keyboard, Mouse and LCD Monitor ........................................1-21
Figure 1-2: 701-DL Rack Mount with Keyboard, Trackball, and LCD Monitor .........................................1-22
Figure 1-3: Starmux Rackmount with Keyboard, Trackball Mouse, and Display.....................................1-22
Figure 1-4: 4205 Towfish Side View.........................................................................................................1-23
Figure 1-5: 4205 Towfish Forward View ..................................................................................................1-23
Figure 1-6: 4205 Towfish Aft View...........................................................................................................1-23
Figure 1-7: Kevlar Tow Cable ...................................................................................................................1-24
Figure 2-1: 4205 Towfish ICD – 0020967 .................................................................................................2-32
Figure 2-2: 4205 with 2Ft Depressor – 0021208......................................................................................2-33
Figure 2-3: 4205 MPMT Towfish Endcap Connections ............................................................................2-34
Figure 2-4: 4205 MPMT Tri-Frequency Endcap Connections ..................................................................2-35
Figure 2-5: Tow Cable Connections .........................................................................................................2-36
Figure 2-6: 4205 MPMT and Tri-Frequency Tow Cable Connections with Pinouts .................................2-37
Figure 2-7: 4205 MPMT and Tri-Frequency ROV Tow Cable Connections with Pinouts. ........................2-38
Figure 2-8: Starmux IV ICD .......................................................................................................................2-43
Figure 2-9: Starmux IV DL in Case ............................................................................................................2-44
Figure 2-10: 701 DL ..................................................................................................................................2-45
Figure 3-1: 4205 MPMT Towfish Diagram ...............................................................................................3-46
Figure 3-2: Starmux IV Front and Back Panels .........................................................................................3-50
Figure 3-3: Labeled Front Panels of 2300 Rackmount .............................................................................3-53
Figure 3-4: Labeled Rear Picture of 2300 Rackmount .............................................................................3-54
Figure 3-5: 701-DL Front and Back Panels ...............................................................................................3-56
Figure 3-6: 4205 Rack Mount Topside Processor Front Panel.................................................................3-58
Figure 3-7: 4205 Rack Mount Topside Processor Rear Panel ..................................................................3-59
Figure 3-8: 4205 System Diagram............................................................................................................3-60
Figure 3-9: Example of 4205 Rack Mount System with the Directional Multi-Beacon
Transponder/Responder used with the EdgeTech USBL BATS................................................................3-61
Figure 3-10: 4205 Topside Block Diagram ...............................................................................................3-62
Figure 3-11 Starmux III Front Panel .........................................................................................................3-64

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4205 SIDE SCAN SYSTEM0021769_REV_D
Figure 3-12: Starmux III Back Panel .........................................................................................................3-64
Figure 3-13: 4205 Rack Mount Topside Processor Front Panel...............................................................3-67
Figure 3-14: 4205 Starmux III Rack Mount Topside Processor Rear Panel..............................................3-68
Figure 3-15: 4205 System Diagram ..........................................................................................................3-69
Figure 3-16: Example of 4205 Rack Mount System with the Directional Multi-Beacon
Transponder/Responder used with the EdgeTech USBL BATS................................................................3-70
Figure 3-17: 4205 Starmux III Topside Block Diagram .............................................................................3-71
Figure 4-1: 4205 Towfish with Armored Tow Cable ................................................................................4-76
Figure 5-1: Towfish Control Tab in Discover 4205 MPMT .......................................................................5-83
Figure 5-2: Sidescan Control Tab in Discover 4205 Tri-Frequency ..........................................................5-83
Figure 5-3: Bottom Track Tab...................................................................................................................5-85
Figure 5-4: 4205 Towfish..........................................................................................................................5-86
Figure 7-1: Tailfin Removal ......................................................................................................................7-89
Figure 7-2: Aft Endcap Cable Disconnection............................................................................................7-89
Figure 7-3: Side Seal Screw and Washer..................................................................................................7-90
Figure 7-4: Nylon Retaining Line Removal ...............................................................................................7-90
Figure 7-5: Nose Cone Removal...............................................................................................................7-91
Figure 7-6: Forward Endcap Cable Disconnections..................................................................................7-91
Figure 7-7: Aft Endcap Grip Handle Installation ......................................................................................7-92
Figure 7-8: Electronics Chassis Removal From Towfish Housing .............................................................7-92
Figure 7-9: sockBlast on Towfish Side....................................................................................................7-101
Figure 7-10: Sockblast Client on Topside Computer..............................................................................7-101

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LIST OF TABLES
Table 1-1: 4205 Towfish Options .............................................................................................................1-23
Table 2-1: 4205 Sonar Performance Specifications .................................................................................2-26
Table 2-2: Towfish Specifications.............................................................................................................2-27
Table 2-3: Starmux IV Specifications........................................................................................................2-28
Table 2-4: 701-DL Specification ...............................................................................................................2-30
Table 2-5: Starmux III Specifications Cable Specifications .....................................................................2-31
Table 2-6: Kevlar Tow Cable Specifications..............................................................................................2-31
Table 2-7: Armored Tow Cable Specifications .........................................................................................2-31
Table 3-1: 701-DL Controls, Indicators, and Connections........................................................................3-49
Table 3-2: Starmux IV Rack Mount Controls, Indicators, and Connections.............................................3-52
Table 3-3: DL Controls, Indicators, and Connections...............................................................................3-55
Table 3-4: 701-DL Rack Mount Controls, Indicators and Connections ....................................................3-57
Table 3-5: Starmux II Controls, Indicators and Connections....................................................................3-63
Table 3-6: Starmux III Rack Mount Controls, Indicators and Connections ..............................................3-66
Table 4-1: AC Power Wiring Wire Colors for Conversion.........................................................................4-74
Table 4-2: Topside Processor Ethernet Devices TCP/IP Addresses..........................................................4-75
Table 4-3: Towfish Ethernet Device IP Address .......................................................................................4-75
Table 7-1: Starmux IV Troubleshooting Table..........................................................................................7-94
Table 7-2: 701-DL Digital Link Troubleshooting Guide. ...........................................................................7-95
Table 7-3: 701-DL Rackmount Troubleshooting Chart.............................................................................7-96
Table 7-4: Starmux III Rack Mount Troubleshooting Chart .....................................................................7-96
Table 7-5: Starmux III Troubleshooting Guide .........................................................................................7-98
Table 7-6: Reported Errors.....................................................................................................................7-102
Table 7-7: 4205 MPMT 100-400 kHz Spare Kit ..................................................................................... A-105
Table 7-8: 4205 MPMT 230-850 kHz Spare Kit ..................................................................................... A-105
Table 7-9: 4205 MP 230-530 kHz Spare Kit........................................................................................... A-106
Table 7-10: 4205 Tri-Frequency 120/410/850 Spare Kit....................................................................... A-106
Table 7-11: 4205 Tri-Frequency 120/540/850 Spares Kit701-DL Spare Kit .......................................... A-107
Table 7-12: 701 Digital Link Spare Kit ................................................................................................... A-107

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4205 SIDE SCAN SYSTEM0021769_REV_D
Table 7-13: 4205 Tool Kit ...................................................................................................................... A-108

1-19
1.0 OVERVIEW
The next-generation 4205 is a versatile side scan sonar system that can be configured for almost any
survey application from shallow to deepwater operations. The 4205 utilizes EdgeTech’s Full Spectrum®
CHIRP technology to provide crisp, high-resolution imagery at ranges up to 50% greater than non-CHIRP
systems, thus allowing customers to cover larger areas and save money spent on costly surveys.
In addition to the high-resolution imagery that EdgeTech is known for, the 4205 comes with several new
features that make the system even more flexible and powerful in offshore operations. The 4205 is
available in either a tri-frequency side-scan sonar configuration or motion tolerant and multi-pulse
configuration. The tri-frequency version allows surveyors the option to operate any two frequencies
simultaneously from the tri-frequency system. Long-range operations, for example, can be achieved with
a selection of 230/540kHz combination. Then, on-demand the system can be changed to a 540/850kHz
system for an even higher resolution survey.
The 4205 Motion Tolerant Configuration with Multi-Pulse (MPMT) provides surveyors the ability to
operate either at faster survey speeds or in more adverse weather conditions while still obtaining high-
quality underwater imagery. This configuration can also be operated in a single pulse high-resolution
mode for those operations that require a highly detailed view of the seafloor. In both the SP and MP
configurations, the two frequencies are transmitted simultaneously. In the MP configuration, multi-pulse
operation doubles the repetition rate. This allows for increased tow speeds of up to 9.6 knots, while still
meeting the NOAA and IHO-44S Shallow Water Survey Specification of three pings on a 1-meter cubed
target at 100 meters.
In both the Tri-Frequency and Motion Tolerant/Multi-Pulse configurations, towfish and target positioning
have been improved with the integration of a more accurate heading sensor that can be coupled with an
optional USBL beacon. Additionally, all systems now come with Increased Towfish power to support a
wider range of additional third-party sensors. All EdgeTech 4205 systems are comprised of a topside
system and a reliable stainless-steel towfish. Topside processors come in a choice of configurations from
Portable to Rack Mounted units. The easy-to-use Discover software is supplied with every unit.
Dual-Frequency Sonar Options include 120/410 kHz, 230/540 kHz, and 230/850 kHz, while Tri-Frequency
Sonar Options include 120/410/850 kHz and 230/540/850 kHz. In all configurations, the frequencies are
transmitted as linearly-swept, wide-band, high energy acoustic pulses. The received echoes are processed
into high Signal-to-Noise Ratio (SNR) images that can be directly displayed as shades of gray or one of
many varying color palettes on a computer monitor.
The 4205 has a variety of features, including:
•Tri-Frequency Side Scan Sonar
•Motion Tolerant Mode
•Improved Target Positioning
•Crisp, High-Resolution CHIRP images
•Increased Towfish power to support a wider range of additional Third-Party Sensors
•Single-pulse high-resolution mode

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4205 SIDE SCAN SYSTEM0021769_REV_D
1.1 4205 Side Scan Sonar System Applications
The 4205 High Definition Tri-Frequency Side Scan Sonar System has many potential applications, including:
•Cable & pipeline surveys
•Geological/geophysical surveys
•Mine countermeasures (MCM)
•Geohazard surveys
•Channel clearance
•Search and recovery
•Archeological surveys
1.2 Main System Components
The 4205 High Definition Tri-Frequency Side Scan Sonar System is made up of 3 main components:
•Topside processor (Two types are available: 701-DL, Starmux IV, and rack-mounted versions of
both.)
•Towfish (ten configurations available)
•Tow cable (Available up to 6000 meters in length)
Contact CUSTOMER SERVICE for questions about cable types and lengths.
1.2.1 Topside Processor
Each of the 4205 Topside Processor options provides downlink telemetry to the towfish for sonar control.
They also receive up-link side-scan data, sensor data, and status information from the towfish for
processing, storage, and display. Each topside processor interfaces with a Towfish over a 10/100BaseT
connection, using Asynchronous Digital Subscriber Line (ADSL) modems. There are four types of 4205
topside processor configurations:
•Starmux IV DL [with or without Laptop]
•4205 Starmux IV Rack Mount
oStarmux IV and 2U Computer inside Case
oKeyboard
oTrackball
oLCD Monitor
•701-Digital Link DL [with or without a Laptop].
•4205 701-DL Rack Mount
o701-D-Link and 2U Computer inside a 6U Hardigg Case
oKeyboard
oTrackball
oLCD Monitor