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Chirp III Acoustic Profiling System

Contents

1. 2 4 InDp t OUutDUI Eu eee eee EREE EE E REN 2 4 TTV 170 Series Tow Vehicle 2 6 Physical Characteristics 2 6 Low Frequency Sonar 2 6 High Frequency Sonar 2 7 Sonar Receiver 2 7 TTV 290 Series Tow Vehicle 2 7 Physical Characteristics 2 7 Low Frequency Sonar 2 8 High Frequency Sonar 2 8 Sonar Receiver ARA xcci sve due Gran RA a ste 2 9 System Manual P N M664 0100 Rev B Chirp Acoustic Profiling System ix Hull Mount System 2 9 Low Frequency Sonar 2 9 High Frequency 2 9 Remote Controlled Transmit Receive Module 2 10 SECTION 3 Setup and Deployment 3 1 Unpacking cec SEU tens us 3 3 DSP 665 Transceiver Setup 3 5 Assembling the TTV 290 Series Tow Vehicle 3 6 DSP 665 Transceiver Connections 3 7 Connecting the Transceiver 3 11 Connecting the Tow Vehicle 3 12 DSP
2. 3 If required in the Benthos Chirp III Server dialog box enter IP address for the DSP 665 Transceiver in the Server IP Address text box The default address is 192 168 0 24 4 If required enter a TCP port address in the TCP Port text box The default port address is 5009 5 Select the transmit repetition rate from the Sonar Rep Rate drop down list box in accordance with Table 3 1 System Manual P N M664 0100 Rev B Chirp Ill Acoustic Profiling System 3 17 Henthos Chirp Ill Server Serves Addinss TCP Peat 19 168 0 2 5009 Cho 9 ChertConnecten S Log Raw Data Sons Pep Plate C Chep Pulse intemal Trigger Eaten Tio Test 7 LF Enable HF Enable Lf Rectiy HF Rectt Tract Power PWR3 PWRO Gan 08 OB Frequency 5 kHz 100 kHz Pulse Length 6 0 ms vj 60 Pro Range Penod Samples 8 10 01 no Mira Average Manum 0 57 872 0 165 0004 Figure 3 5 The Benthos Chirp Ill Server Dialog Box Table 3 1 Recommended Transmit Repetition Rate vs Depth Below Transducer Transmit Depth Below Repetition Rate Transducer seconds meters 0 062 45 0 125 90 0 250 0 375 0 500 0 750 1 000 1 500 2 000 4 000 3000 8 000 6000 SECTION 3 Setup and Deployment System Startup 3 18 TELEDYNE BENTHOS 6 Select the Chirp Pulse option to operate in chirp mode or select the CW option to o
3. Dual Receiver SOHLN34 ANAGATSL jo AloayL NOILO3S uondioseg jeuonoung 999 45 REAR PANEL BOARD HIGHPASS FILTER FL2 BANDPASS FILTER FL1 TRANSMITTER BOARD CHANNEL 2 ELECTRONICS CHASSIS REMOVAL HANDLE 2 TRANSFORMER JUMPER BOARD CHANNEL 2 TRANSFORMER T1 CHANNEL 2 CHASSIS SCREWS 4 REMOVE TO REMOVE ELECTRONICS CHASSIS COOLING FAN CHANNEL 2 ENERGY STORAGE AC LINE CPU TRANSDUCER BPR CONNECTOR FILTER BOARD CONNECTOR DSP BOARD CPU BOARD POWER SUPPLY BOARD DUAL RECEIVER BOARD TRANSMITTER BOARD CHANNEL 1 48 VDC POWER SUPPLY UNDER ELECTRONICS CHASSIS TRANSFORMER JUMPER BOARD CHANNEL 1 222 gt p 2 4 TRANSFORMER 1 CHANNEL 1 FRONT PANEL BOARD NOTE A TRANSMITTER BOARD A TRANSFORMER JUMPER BOARD AND AN ENERGY STORAGE CAPACITOR BANK ARE A SINGLE REMOVABLE MODULE ONE MODULE CHANNEL 1 ENERGY STORAGE CAPACITORS UNDER TRANSMITTER FOR EACH CHANNEL TO REMOVE A MODULE DISCONNECT CAPACITORS UNDER TRANSMITTER AND TRANSFORMER JUMPER BOARDS THE CABLES AND REMOVE THE FOUR MOUNTING SCREWS AND TRANSFORMER JUMPER BOARDS Figure 4 2 DSP 665 Transceiver Chassis uejs s ulyd onsnooy d1149 Gr 4 6 TELEDYNE BENTHOS Circuit Board Description Listed below are the circuit boards that are included in the transceiver along with their assembly drawing numbers CPU C664 1283 DSP OEM supplied Power Supply B664 123
4. for the wiring diagrams A reading of 1 ohm or less should be observed on short cables and connector molds The reading for deck cables will be higher SECTION 5 Maintenance and Troubleshooting System Troubleshooting 5 6 System Manual TELEDYNE BENTHOS Short Circuit Test Disconnect both ends of the cable and clean the connectors Using a megometer or a digital multimeter on the highest ohm scale measure the resistance of each pin of the cable or connector mold to every other pin All measurements should read greater than 10 megohms however a value as low as 1 megohm will allow the system to work temporarily as the short circuit is still developing Transducer Checks If it is Suspected that a transducer or a hydrophone is not functioning there are four simple checks that can be performed inspection for signs of arcing tapping the face of the transducer or hydrophone and checking for a signal output checking for a short circuit and applying a signal to the input of the transducer and listening for a transmitted pulse Arcing For a transducer check the connector on the connector pigtail of the transducer for signs of arcing A black carbon material or voids in the rubber are signs of arcing If a connector has arced both the connector and its mating connector should be cleaned thoroughly to remove all carbon and dirt If the rubber has significantly eroded replace the connector Inspect the mating connector and replace i
5. sources noise NOTE It is also recommended that the transducers be installed where the angle of the hull is 10 or less relative to the horizontal This angle is shown in Figure A 2 Transducer Installation The transducers are mounted inside the sea chest on mounting plates in accordance with detailed installation drawings that can be obtained from Teledyne Benthos for the specific installation When the transducers are installed they are connected to the junction box as shown in Figure A 1 with cables and block mold connectors which are located inside the sea chest After the installation is complete and the cables connected the sea chest is flooded For further information on the installation of the transducers including detailed drawings of typical installations contact Teledyne Benthos System Wiring Both the low frequency and high frequency transducers are individually wired to one or more junction boxes In the junction box the low frequency transducers are wired in series parallel and then wired along with the high frequency transducer to the Remote Controlled Transmit Receive module The Remote Controlled Transmit Receive module includes a preamplifier for amplifying the received signals and an attenuator for controlling the transmit power level Both the gain of the preamplifiers and the transmit power level are remotely controlled by the DSP 665 Transceiver SECTION A Hull Mount System Installation Requirements System
6. thereby increasing range and bottom penetration STAND PIPE TO JUNCTION BOX VENT STUFFING d 1 10 OR LESS ef ABS WINDOW IF POSSIBLE Figure A 2 Inside Hull Transducer Array Configuration Transducer Location When determining the location for the transducers consideration should be given to the presence of four typical sources of noise hydrodynamic which includes flow turbulence cavitation bubbles and splash noise from the ship s propeller acoustic sources from other bathymetric systems and machinery including turbines pumps and blowers The location of the transducers should be in an area that is relatively quiet and as free as possible from all these noise sources In addition the transducers should be installed as far as possible from stabilizing fins or vanes which can produce turbulence and bubbles Generally the optimum location of the transducers is from 1 2 to 1 3 of the distance from the bow to the stern and close to the keel P N M664 0100 Rev B System Manual Chirp Acoustic Profiling System A 5 gt NOTE If survey speeds exceeding 5 knots are anticipated it is especially important to ensure the transducers will remain submerged at all times and the area around the array will remain relatively free of hydrodynamic
7. Acoustic Profiling System 3 15 Selecting and Installing the Sonar Data Acquisition and Display Software Data can be acquired displayed and saved using third party sonar data acquisition and display software installed on the client computer Refer to Main System Components on page 1 3 for a list of software manufacturers These manufactures provide data acquisition and display software that is compliant with the Teledyne Benthos Chirp III Server Select and install the software in accordance with the installation instructions provided with the software Contact Teledyne Benthos for more information about the available software and how to contact the manufacturers NOTE A client computer with the selected sonar data acquisition and display software and required operating system factory installed can be provided for a complete turn key system System Startup After all the connections have been made the client computer is ready to be turned on and the DSP 665 Transceiver activated When activated the Benthos Chirp Server parameters can be configured the predeployment checks performed and the tow vehicle launched Activating the DSP 665 Transceiver If not already done so during prior use of the system it may be necessary to set the front and rear panel switches on the DSP 665 Transceiver to their default settings Perform the steps below to activate the transceiver and set or verify the switch settings 1 Turn on th
8. Cable Length Tow Speed Cable Length knots meters Connecting the Tow Cable If the standard Kevlar reinforced deck cable is not to be used to connect to the tow vehicle begin with Step 1 below to disconnect the deck cable and connect the armored multi conductor tow cable If the deck cable is to be used to connect to the tow vehicle leave the cable connected and begin with Step 2 In addition be sure to use a steel tow cable not the Kevlar reinforced deck cable to tow the tow vehicle WARNING If the deck cable is to be disconnected from the tow vehicle be sure the transceiver is turned off by verifying that the POWER switch on the front panel of the transceiver is off Refer to DSP 665 Transceiver Operator Functions on page 3 13 for a description of the front panel controls P N M664 0100 Rev B Chirp Acoustic Profiling System 3 25 1 After turning off the transceiver disconnect the deck cable from the tow vehicle and the transceiver Connect but do not yet attach the armored multi conductor tow cable to the tow vehicle and connect the winch s deck cable to the transceiver 2 Fora TTV 170 Series Tow Vehicle attach the steel tow cable or the armored multi conductor tow cable to the forwardmost hole on the tow point at the top of the tow vehicle using the supplied shackle or tow cable retention bolt For a TTV 290 Series Tow Vehicle use the second hole from the forwardmost one Do not secure the t
9. Teledyne Benthos as described in Client Computer on page 1 8 The computer also requires a monitor a keyboard and a mouse The recommended screen size for the monitor is 17 inches and the resolution 1280 X 1024 Software Application Operating system Processor CPU Memory O ports Graphics processor Monitor Data storage Power input SECTION 2 Specifications Third party data acquisition and display Microsoft Windows XP Professional Intel 3 4 GHz Pentium 4 800 MHz FSB 1MB L2 cache 2GB DDR 667 SDRAM Keyboard PS 2 Mouse PS 2 USB 6 RS 232 serial 4 Parallel Ethernet 10 100 1000BaseT 2 Intel Graphics Media Accelerator 950 20 inch LCD 1680 x 1050 resolution 500GB SATA in removable carrier DVD R W drive 110 220 VAC Client Computer Recommended Minimum Requirements 2 4 TELEDYNE BENTHOS DSP 665 Transceiver System Manual The DSP 665 Transceiver connects to both the client computer and the TTV 170 or TTV 290 Series Tow Vehicle or hull mount system It provides communications with client computer over the Ethernet 10 100BaseT connection powers the transducers on the tow vehicle or hull mount system and inputs the received sonar signals Power Requirements Power input 100 125 VAC or 220 240 VAC 50 60 Hz 350 watts auto sensing NOTE If a generator is to be used as the power source a rating of 1500 watts is recommended Input Output Op
10. Wiring A 6 System Manual TELEDYNE BENTHOS Junction Box The junction box should be mounted within 50 meters of the transducers and to a part of the ship s structure that is relatively vibration free It should not be mounted near or on any machinery Do not mount the junction box in an area that is normally flooded and be sure that access to the junction box is available the junction box cover opens from right to left The junction box connects the transducers to the Remote Controlled Transmit Receive module Remote Controlled Transmit Receive Module The Remote Controlled Transmit Receive module should be mounted within 10 feet of the transceiver in accordance with the same mounting considerations used when installing the junction box The module connects the transceiver to the junction box Transceiver The DSP 665 Transceiver is installed in accordance with the procedures in SECTION 3 Setup and Deployment The mounting considerations and connections are the same except that the transceiver is permanently connected to the Remote Controlled Transmit Receive module P N M664 0100 Rev B
11. a large area of the seafloor The transducer produces a series of reflections that stretch the returned pulse length The system can distinguish between pulses returning as Echo 1 and Echo 2 but cannot distinguish between Echo 2 and Echo 3 P N M664 0100 Rev B Chirp Acoustic Profiling System 1 13 SOURCE SEAFLOOR FIRST BOUNDARY SECOND BOUNDARY ks Figure 1 7 Resolving Closely Spaced Layers The larger the area that is insonified the more the return pulse will be stretched A 1 millisecond pulse could be stretched to 1 5 or 2 milliseconds The stretching of the pulse results in the smearing of features that are close together The transmitted pulse of 1 millisecond corresponds to a 1 kHz bandwidth but the received pulse stretched to 1 5 millisecond for example corresponds to a 675 Hz bandwidth This pulse stretching effectively reduces the bandwidth and with it the system s ability to resolve layers or objects that are closely spaced Therefore narrower beams produce better resolution Signal processing improves resolution by eliminating or attenuating beam components that would otherwise degrade the resolution All transmitted narrow beam sound pulses produce side lobes which contain energy that stretches the pulse and produces undesired echoes from reflections not located in the primary beam In conventional sidescan and subbottom sonar systems resolution is lost to stretching by the side lobes With ch
12. connector Note that the tow cable will be attached later P N M664 0100 Rev B Chirp Acoustic Profiling System 3 13 DSP 665 Transceiver Operator Functions The DSP 665 operator functions are accessible on the front and rear panels The front panel operator functions are shown in Figure 3 3 on page 3 8 For information on the CH1 ANALOG IN CH2 ANALOG IN EXT KEY IN and PREAMP IN connectors called out below refer to DSP 665 Transceiver Connections on page 3 7 The front panel operator functions are the following POWER switch A rocker switch that turns the transceiver on or off The transceiver turns on when is pressed and off when 0 is pressed POWER indicator A green LED that is illuminated when the transceiver is on TRANSMIT CH1 indicator A red LED that flashes at the repetition rate of the Channel 1 transmitter TRANSMIT CH2 indicator A red LED that flashes at the repetition rate of the Channel 2 transmitter CH1 ANALOG IN switch A toggle switch that enables the CH1 ANALOG IN input when switched to ON When switched to OFF the CH1 ANALOG IN input is disabled and signals are input from the tow vehicle or the hull mount system CH2 ANALOG IN switch A toggle switch that enables the CH2 ANALOG IN input when switched to ON When switched to OFF the CH2 ANALOG IN input is disabled and signals are input from the tow vehicle or the hull mount system SECTION 3 Setup and Deployment DSP 665 Transceive
13. networks which allow the transceiver to transmit and receive from the same transducer or transducer array SECTION 1 Overview Advantages of Chirp Sonar 1 8 TELEDYNE BENTHOS External Connections The DSP 665 Transceiver connects to the client computer over an Ethernet 10 100BaseT connection allowing the computer to send commands to the transceiver while simultaneously receive sonar data from the transceiver Although the client computer typically connects directly to the transceiver these two components can also be connected through a hub or router ona local area network LAN In addition the transceiver includes inputs for externally triggering the sonar analog and preamplifier inputs and outputs hydrophone inputs the system s main power switch preamplifier gain controls and transmit indicators TCP IP Connection For the client computer to communicate with the DSP 665 Transceiver it must be running an operating system that can support a Transmission Control Protocol Internet Protocol TCP IP connection such as Windows 98 NT 2000 XP Linux Unix or Solaris and have a Ethernet 10 100BaseT adaptor installed In addition an IP address must be assigned to the computer To control the transceiver sonar on the tow vehicle and to acquire display and store sonar data third party sonar data acquisition and display software that is compliant with the Teledyne Benthos Chirp Ill Server must be installed on the client computer The Te
14. onto the tow vehicle The tail fins can be installed without removing the polyethylene shell A 9 16 inch wrench is the only tool required System Manual Perform the steps below to install the tail fins 1 Refer to Figure 3 1 and locate the anchor pins for the port and starboard tail fins and the pin for the top tail fin The shell is shown removed in the figure for clarity The pins serve to anchor the tail fins in place With the shell on the anchor pins can be seen by looking inside the aft end of the tow vehicle Slide a tail fin one that has two slots as shown in Figure 3 2 horizontally along the top of the frame such that the two slots in the fin slide over the two anchor pins Secure the tail fin with a supplied 3 8 inch hex bolt flat washer and lock washer and tighten with the 9 16 inch wrench Repeat Steps 2 and 3 for the opposite tail fin Slide the tail fin with the ANCHOR PIN FOR TOP FIN I ANCHOR PINS FOR PORT FIN ANCHOR PINS FOR STARBOARD FIN Figure 3 1 Location of Anchor Pins 3 8 INCH HEX BOLT FLAT WASHER AND LOCK WASHER 3 SETS TAIL FIN SLOT TOP FIN TAIL FIN SLOTS Ge PORT AND STARBOARD TAIL FINS Figure 3 2 Mounting the Tail Fins one slot as shown in Figure 3 2 vertically along the top of the frame such that the slot in the fin slides over the anchor pin for the top fin Secure the tail fin with a supplied 3 8 inch hex bolt flat
15. or verify the jumper configurations on both boards SECTION 5 Maintenance and Troubleshooting System Troubleshooting 5 8 System Manual TELEDYNE BENTHOS a 199 Br 4 Bali JUMPERS 2 JUMPERS 2 TRANSFORMER JUMPER TRANSFORMER JUMPER BOARD CHANNEL 2 BOARD CHANNEL 1 Figure 5 1 Location of the Transformer Jumper Boards Turn off the DSP 665 Transceiver Loosen the quarter turn fasteners that secure the cover and remove the cover Locate the two Transformer Jumper boards one connecting to the Channel 1 Transmitter board and the other to the Channel 2 Transmitter board Refer to the leftmost column in the table in Drawing B662 07747 and locate the model number of the tow vehicle that is to be connected In the STANDARD column under LOW FREQUENCY CHANNEL 1 determine the HIGH and LOW jumper settings for the tow vehicle P N M664 0100 Rev B Chirp Acoustic Profiling System 5 9 6 Locate the jumper sockets JMP1 JMP6 on the Transformer Jumper board that connects to the Channel 1 Transmitter board Two of the jumper sockets should have a jumper already installed 7 Reconfigure the jumper settings by removing and reinstalling as necessary the two jumpers in accordance with the HIGH and LOW jumper settings determined in Step 6 8 In the STANDARD column under HIGH FREQUENCY CHANNEL 2 determine the HIGH and LOW jumper settings for the tow vehicle 9 Locate the jumper socket
16. specific engineering instructions and drawings which are supplied by Teledyne Benthos Contact Teledyne Benthos for instructions and recommendations with regard to the specific installation T REMOTE CONTROLLED TRANSMIT RECEIVE MODULE JUNCTION BOX AT 12D7 DSP 665 TRANSCEIVER TRANSDUCER 9 LOW FREQUENCY AT 471 TRANSDUCERS 0 Dp 000 000 Figure A 1 Major Components ofa Typical Hull Mount System SECTION A Hull Mount System Installation Requirements A 4 TELEDYNE BENTHOS Transducer Array Configurations Two general transducer configurations can be applied to the installation of the transducer array the through hull and inside hull configurations In a through hull configuration the transducers penetrate the hull and are either flush mounted or protrude outside the hull In this configuration a free flooding dome is used to protect and fair in the transducers In an inside hull configuration the transducers are mounted entirely within the hull in a sea chest as shown in Figure A 2 In this configuration the sea chest is flooded and a stand pipe is used to subject the transducers to a hydrostatic pressure The hydrostatic pressure allows more power to be applied to the transducers without causing cavitation
17. the CH1 ANALOG IN CH2 ANALOG IN LF AUX IN or HF AUX IN connector The rear panel connectors include 10 pin male and female Amphenol connectors which are the BPR and TRANSDUCER connectors an RJ 45 connector for the ETHERNET connector and an IEC connector for the VAC IN connector The rest of the connectors are BNC types The rear panel connectors are shown in Figure 3 4 and are the following CH1 RECEIVE CH2 RECEIVE TRANSDUCER SECTION 3 Setup and Deployment Inputs an analog signal to the Channel 1 receiver input Used for calibration testing or troubleshooting the Channel 1 receiver Inputs an analog signal to the Channel 2 receiver input Used for calibration testing or troubleshooting the Channel 2 receiver Connects to the tow vehicle or to the Remote Controlled Transmit Receive Module in a hull mount system DSP 665 Transceiver Connections jenueyy 0010 7991 N d BPR TRANSDUCER REAR PANEL AIR FILTERS 2 CH1 HYDROPHONE T R ETHERNET FUSE CH1 RECEIVE VAC IN HYDROPHONE CH2 HYDROPHONE T R CH2 RECEIVE Figure 3 4 DSP 665 Transceiver Rear Panel 01 6 SOHLN34 3NAG3131L Chirp Acoustic Profiling System 3 11 HYDROPHONE Outputs the analog signals that are input from the hydrophone array connected to the TRANSDUCER connector It is the same signal that is output on the CHIRP HYDROPHONE connector on the front panel Can be used as the input to a preamplifier B
18. 3 Transmitter C206 06523 Dual Receiver C664 1243 Front Panel C664 1263 Rear Panel B662 07777 Transformer Jumper B662 07747 CPU Board The CPU board runs an embedded version of the Linux operating system and includes an A D converter and a first in first out FIFO memory The A D converter is a six channel 16 bit analog to digital converter that inputs and digitizes the received low and high frequency sonar signals including the analog and auxiliary input signals The digitized chirp sonar data are then output to the DSP board for matched filter processing The FIFO memory inputs the processed sonar data from the DSP board providing temporary memory for the data The data are input in 32 bit wide format and output in first in first out order to the CPU The CPU board also commands and controls the DSP board and outputs all the data in TCP IP packets to the client computer over the Ethernet 10BaseT connection In addition the CPU board also supports a number of individual input output I O connections for on off control of the transmitters and the setting of the receiver gains Additional I O connections provide on off control of diagnostics System Manual P N M664 0100 Rev B Chirp Acoustic Profiling System 4 7 DSP Board The DSP board provides the sonar key and transmit gates in accordance with the transmit repetition rate and includes a burst generator which generates the chirp or CW pulse transmit signals The transmit signa
19. 665 Transceiver Operator Functions 3 13 Selecting and Installing the Sonar Data Acquisition and Display SoftWare euch tae NAA NAA cea sae 3 15 System cin el 3 15 Activating the DSP 665 Transceiver 3 15 Configuring the Chirp Ill Server Parameters 3 16 Performing the Predeployment Checks 3 20 Tow Vehicle Deployment 3 23 Selecting a Tow 3 23 Connecting the Tow Cable 3 24 Launching the Tow Vehicle 3 26 Connecting an Alternate Seismic Source 3 27 Connecting the Internal or External Trigger Source 3 27 Connecting and Adjusting the Preamplifier 3 28 Connecting One or Two Seismic Sources Operating at Greater than 1 5 2 3 28 Connecting One or Two Seismic Sources Operating at 1 5 KHz OL LOSS 2 22 255 Ne dux ete Re AA 3 28 SECTION 4 Theory of Operation 4 1 DSP 665 Functional Description 4 3 Circuit Board Description 4 6 CPU Board uua Vase be ee ei Ri sede 4 6 DSP Board cae ed AA eee es 4 7 Power Supply Board 4 7 Contents x TELEDYNE BENTHO
20. Chirp Ill Acoustic Profiling System System Manual P N M664 0100 Rev B YE TELEDYNE BENTHOS A Teledyne Technologies Company Teledyne Benthos Inc 49 Edgerton Drive North Falmouth MA 02556 U S A Tel 508 563 1000 Fax 508 563 6444 www benthos com TELEDYNE BENTHOS Notices System Manual Proprietary Information The information descriptions photos and illustrations in this manual are the property of Teledyne Benthos Inc Materials may not be reproduced or disseminated without the prior written consent of Teledyne Benthos Warranty and Intellectual Property Rights Statement This Statement applies to Teledyne Benthos Inc products including Teledyne TapTone products Approved 3 27 06 LIMITED WARRANTY Teledyne Benthos Inc warrants that the products sold hereunder shall be free from defects in materials and workmanship under normal use and service when correctly installed used and maintained for a period of one 1 year from date of shipment from Teledyne Benthos Inc Purchaser s receipt of any product delivered hereunder shall be an unqualified acceptance of and a waiver by Purchaser of the right of Purchaser to make a claim with respect to such product unless Purchaser gives Teledyne Benthos Inc notice of any claim within one 1 year after shipment from Teledyne Benthos Inc of such product This warranty is limited to repair or replacement of the said product in the sole discretion of Teledyne Be
21. PR Connects to the hydrophone array of legacy acoustic profiling systems and supplies power to the array preamplifier Used to connect the hydrophone array output to the ANALOG HYDROPHONE connector on the front panel ETHERNET Connects to a client computer or to a Ethernet 10 100BaseT local area network LAN VAC IN Connects to the AC power source Connecting the Transceiver Perform the steps below to make the connections to the DSP 665 Transceiver If a client computer will be connected to the transceiver refer to its user manual for the setup instructions WARNING Before making any connections to the DSP 665 Transceiver be sure it is turned off by verifying that the POWER switch on the front panel is off Refer to DSP 665 Transceiver Operator Functions on page 3 13 fora description of the front panel controls NOTE To communicate with the DSP 665 Transceiver over the Ethernet 10 100BaseT connection the IP address of the client computer must be correctly set The default setting is 192 168 0 24 SECTION 3 Setup and Deployment DSP 665 Transceiver Connections 3 12 System Manual TELEDYNE BENTHOS If connecting the transceiver to a client computer connect a network crossover cable to the ETHERNET connector on the transceiver and to the network connector on the client computer If connecting the transceiver to a LAN connect a network patch cable to the ETHERNET connector on the trans
22. S Transmitter Board 4 7 Dual Receiver 4 8 Front Panel Board sex aienu RR REGERE detain UD EE eed 4 8 Rear Panel Board 4 9 Transformer Jumper Boards 4 9 SECTION 5 Maintenance and Troubleshooting 5 1 DSP 665 Transceiver Periodic Maintenance 5 3 Removing and Cleaning the Air 5 3 Cleaning the Inside of the Transceiver 5 3 Tow Vehicle Periodic Maintenance 5 4 System Troubleshooting 5 5 Gable Checks 2 22 2212 ECCE EE Er 5 5 AFCIDO LEN a alee St Gree D 5 5 een 5 5 Short Circuit T St ersa are 5 6 Transducer CheckS 2 2 we Ja RE a nee 5 6 VICINO Mann riesen 5 6 Test unserem ar 5 6 Short Circuit Test oues ive lw EYE E Vg 5 7 Transmit Test cedo an A bans vds 5 7 Changing the Transformer Jumpers 5 7 SECTION 6 Drawings iude sweet GA Ka EUN RR ee os di 6 1 DSP 665 Transceiver Drawings 6 3 TTV 170 and TTV 290 Series Tow Vehicle Drawings 6 3 Hull Mount System Drawings 6 3 APPENDIX A Hull Mount System Installation Requirements A 1 Trans
23. SER MAY ALSO HAVE OTHER RIGHTS THAT VARY FROM STATE TO STATE SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSIONS MAY NOT APPLY TO PURCHASER System Manual TELEDYNE BENTHOS INTELLECTUAL PROPERTY RIGHTS No rights in Intellectual property including but not limited to license or other rights under any patent copyrights trade secrets or trademarks owned or controlled by Teledyne Benthos Inc or under which Teledyne Benthos Inc is licensed are granted to Purchaser or implied by the sale of products or services hereunder Purchaser shall not identify as genuine products of Teledyne Benthos Inc any Teledyne Benthos Inc products purchased hereunder which Purchaser has treated modified or altered in any way Purchaser shall not use the trademarks of Teledyne Benthos Inc to identify such products provided however that Purchaser may identify such products as utilizing containing or having been manufactured from genuine products of Teledyne Benthos Inc as treated modified or altered by Purchaser or a representative of Purchaser If products or services sold hereunder are manufactured according to the specifications of Purchaser Purchaser shall indemnify Teledyne Benthos Inc against any liability for patent copyright or trademark infringement on account of such manufacture or performance Liabili
24. Service should you have any comments or suggestions or if you require service or support Please contact us at TELEDYNE BENTHOS INC Attention Customer Service 49 Edgerton Drive North Falmouth MA 02556 U S A Telephone 508 563 1000 Fax 508 563 6444 E mail benthos teledyne com www benthos com Preface viii TELEDYNE BENTHOS Contents SECTION 1 OVETVIEW 1 1 Main System Components 1 3 Advantages of Chirp Sonar 1 7 DSP 665 1 7 External ConnectOnsS sias KANE rinnen 1 8 TCP IP Connection 1 8 Client Computer ri re nira rer 1 8 TOW Vehicles ER eee ee ARE EE 1 10 TTV 170 Series Tow Vehicle 1 10 TTV 290 Series Tow Vehicle 1 10 Hull Mount Transducer Array 1 11 Chirp Technology ur acer RG Pore eee we 1 11 Image Resolution vy deg en Ow ES 1 11 Chirp Pulse Transmission and Reception 1 14 SECTION 2 SPECINICALIONS x dr e won een eRe 2 1 Client Computer Recommended Minimum Reauiremenis sr ns 2 3 AN AA EN 2 3 PROCESSOR ana NG eae al AA 2 3 DSP 665 lt 2 4 Power Requirements
25. TIME CHARGES FOR PURCHASER S TIME AND EFFORT THE CLAIMS OF THIRD PARTIES INJURY TO PROPERTY OR ANY OTHER DIRECT INDIRECT SPECIAL RELIANCE INCIDENTAL OR CONSEQUENTIAL OR ADMINISTRATIVE DAMAGES REGARDLESS OF THE NATURE OF THE CLAIM AND WHETHER OR NOT FORESEEABLE AND WHETHER OR NOT BASED ON THE LEGAL THEORIES OF BREACH OF WARRANTY CONTRACT TORT INCLUDING NEGLIGENCE OR STRICT LIABILITY EVEN IF TELEDYNE BENTHOS INC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES OR FOR ANY CLAIM BY ANY THIRD PARTY EXCEPT AS EXPRESSLY PROVIDED HEREIN THIS LIMITATION OF LIABILITY APPLIES BOTH TO PRODUCTS AND SERVICES AND SUPPORT PROVIDED PURCHASER UNDER THIS AGREEMENT NO ORAL OR WRITTEN INFORMATION OR ADVICE GIVEN BY TELEDYNE BENTHOS INC ITS AGENTS OR EMPLOYEES SHALL CREATE A WARRANTY OR INANY WAY INCREASE THE SCOPE OF THIS LIMITED WARRANTY ANY AND ALL LIABILITY OF TELEDYNE BENTHOS INC IS EXPRESSLY LIMITED TO THE PRICE PURCHASER HAS PAID FOR THE PRODUCT PURCHASER S SOLE REMEDY AGAINST TELEDYNE BENTHOS INC IN ANY DISPUTE UNDER THIS AGREEMENT SHALL BE TO SEEK RECOVERY OF THE AMOUNTS PURCHASER PAID PURSUANT TO THE LIMITED WARRANTY PROVIDED ABOVE UPON THE PAYMENT OF WHICH TELEDYNE BENTHOS INC ITS AGENTS OFFICERS DIRECTORS EMPLOYEES AND AFFILIATES WILL BE RELEASED FROM AND DISCHARGED OF ALL FURTHER OBLIGATIONS AND LIABILITY TO PURCHASER THE LIMITED WARRANTY OF TELEDYNE BENTHOS INC GIVES PURCHASER SPECIFIC LEGAL RIGHTS AND PURCHA
26. V 170 and TTV 290 Series Tow Vehicles D602 04087 B170 06784 B190 07486 B660 07935 TWC 602 Deck Tow Cable Wiring TTV 170 Block Mold Wiring Diagram TTV 290 Block Mold Wiring Diagram BPR Hydrophone Interface Cable Wiring Diagram Hull Mount System Drawings Hull mount system drawings are supplied by Teledyne Benthos in accordance with the specific requirements of the installation Contact Teledyne Benthos for more information Also refer to APPENDIX A Hull Mount System Installation Requirements for a general overview of the installation requirements for a hull mount system SECTION 6 Drawings DSP 665 Transceiver Drawings APPENDIX A Hull Mount System Installation Requirements SECTION A Hull Mount System Installation Requirements Chirp Acoustic Profiling System A 3 his appendix includes a general overview of the requirements for installing a typical hull mount system and connecting it to the DSP 665 Transceiver A hull mount system consists of a transducer array of from 4 to 16 low frequency transducers and a high frequency transducer The transducers are mounted external to the hull or within a hull mounted sea chest The transducers are connected to the transceiver through one or more junction boxes and the Remote Controlled Transmit Receive module The major components of a typical hull mount system is shown in Figure A 1 NOTE Hull mount systems require modification to the vessel and generally require
27. ations are described for use with an alternate acoustic source S etting up the Chirp Acoustic Profiling System begins with the If a hull mount system is to be installed refer to APPENDIX A Hull Mount System Installation Requirements for an overview of the requirements for installing a hull mount system and connecting it to the DSP 665 Transceiver NOTE Once the tow vehicle is deployed and the system is operating refer to the operating instructions provided with the third party sonar data acquisition and display software installed on the client computer Unpacking The DSP 665 Transceiver and the tow vehicles are shipped in separate reusable shipping containers If an optional client computer is included it is shipped in a third shipping container The system documentation is included in one of the containers or shipped separately The containers typically include the items listed below however be sure to check the packing list to verify the exact contents especially for a hull mount system where the number of containers and their contents will vary depending on the configuration Container 1 of 2 e DSP 665 Transceiver e Network crossover cable Network patch cable AC power cable SECTION 3 Setup and Deployment Unpacking 3 4 TELEDYNE BENTHOS Container 2 of 2 e TTV 170 Series Tow Vehicle e Kevlar reinforced deck cable or TTV 290 Series Tow Vehicle e Kevlar reinforced deck cable e Vertical tail fi
28. ceiver and to the hub or router NOTE The DSP 665 Transceiver is autosensing and does not require special switch settings for 110 VAC or 220 VAC operation The transceiver will operate properly using either of these standard VAC power sources 2 Connect an AC power cable to the VAC IN connector on the transceiver and to the 100 125 VAC or 220 240 VAC 50 60 Hz power source The following connections are optional 3 Connect the shipboard navigation system output to the assigned RS 232 serial port on the client computer If an external source is to provide the sonar key connect its key output to the EXT KEY IN connector on the transceiver Connecting the Tow Vehicle One end of the Kevlar reinforced deck cable connects to the DSP 665 Transceiver and the other end connects to the tow vehicle Perform the steps below to connect the deck cable NOTE When connecting a different tow vehicle or an AT 471 transducer array refer to Changing the Transformer Jumpers on page 5 7 for instructions on how to reconfigure or verify the Transformer Jumper board jumper configuration for the new tow vehicle or the transducer array 1 Connect the Kevlar reinforced deck cable 10 pin male Amphenol connector to the TRANSDUCER connector on the rear panel of the transceiver If either the TTV 170 Series or the TTV 290 Series Tow Vehicle is to be connected connect the opposite end of the deck cable to the tow vehicle block mold assembly
29. d deck cable either a longer deck cable or an armored multi conductor tow cable must be used The required length of the armored multi conductor tow cable depends on the anticipated towing speed and tow vehicle depth For relatively shallow applications the standard Teledyne Benthos TWC 601 150 meter armored multi conductor tow cable can be used Table 3 3 lists the approximate operating depth at which the tow vehicle is expected to tow for various towing speeds using this cable Table 3 3 Tow Speed vs Depth Tow Speed Tow Vehicle Depth knots meters 2 100 75 3 4 60 5 50 SECTION 3 Setup and Deployment Tow Vehicle Deployment 3 24 AN System Manual TELEDYNE BENTHOS For towing at deeper depths a longer armored multi conductor tow cable is required Table 3 4 provides a rough guide for determining the required armored multi conductor tow cable length verses towing speed for towing the tow vehicle at a depth of 600 meters For more shallow applications calculate the required cable length by using the ratio of the desired tow vehicle operating depth in meters to 600 meters then multiply this ratio by the cable length for the selected tow speed shown in the table For example if the towing depth is to be 300 meters then the ratio is 300 600 or 0 5 Next if the towing speed is to be 4 knots multiply this ratio by 1500 meters Therefore the required cable length is 750 meters Table 3 4 Tow Speed vs
30. d from the Front Panel board is output to the chirp hydrophone array preamplifiers Both the Channel 1 and Channel 2 amplified chirp transmit waveforms are input to the Rear Panel board from the Transmitter boards and then output to the transducers The hydrophone and transducer outputs are input directly to the Rear Panel board If transducers are used to both transmit and receive the sonar signals the CH1 HYDROPHONE T R switch or the CH2 HYDROPHONE T R switch or both are switched to T R and the transducer outputs from the T R network on the Transmitter board are input to the Rear Panel board The hydrophone array and transducer output signals are filtered by FL2 and FL1 to separate the Channel 1 low frequency signals from the Channel 2 high frequency signals respectively and then output to the Front Panel board All the transceiver rear panel operator functions which include the switches as described in DSP 665 Transceiver Operator Functions on page 3 13 connect to the Rear Panel board In addition all the transceiver rear panel connectors as described in DSP 665 Transceiver Operator Functions on page 3 13 connect to the Rear Panel board Transformer Jumper Boards The Transformer Jumper boards function with the Transmitter boards and allow jumper selection of different power levels Each Transformer Jumper board includes a single multi tapped transformer with a choice of seven available output power levels SECTION 4 Theory of Operati
31. diation 16 Teledyne Benthos AT 471 low frequency transducers 2 3 kw 15 duty cycle at 3 5 kHz for 217 dB re 1 uPa 1 m nominal 4 kw maximum at reduced duty cycle Sweeps in the 2 kHz to 7 kHz band 25 High Frequency Sonar Transmitter transducer Power output Frequency range Transducer radiation SECTION 2 Specifications Teledyne Benthos AT 12D7 high frequency transducer 1 kw 15 duty cycle at 15 kHz for 214 dB re 1 uPa 9 1 m nominal 4 kw maximum at reduced duty cycle Sweeps in the 10 kHz to 20 kHz band 27 Hull Mount System 2 10 System Manual TELEDYNE BENTHOS Remote Controlled Transmit Receive Module Control Software control through LPT2 parallel port Preamplifier gain 46 dB in 3 dB increments Preamplifier attenuation 46 dB in 3 dB increments P N M664 0100 Rev B SECTION 3 Setup and Deployment SECTION 3 Setup and Deployment Chirp Acoustic Profiling System 3 3 2 careful unpacking and inspection of the system components Once this is complete the DSP 665 Transceiver can be set up and connected to the tow vehicle and to a client computer The system can then be activated some predeployment checks made and the tow vehicle deployed This section encompasses these operations describes the operator controls and indicators on the transceiver and includes a startup procedure for getting the system operational as quickly as possible In addition other system configur
32. ducer Array Configurations A 4 Transducer Location eile EIE LAG eke KA PAA A 4 Transducer Installation 5 System Wiring ne A 5 Junction BOX cua ee Sek Oe a peur A 6 Remote Controlled Transmit Receive Module A 6 Transceiver dec Sacer cre kine eur A 6 System Manual P N M664 0100 Rev B Figure 1 1 Figure 1 2 Figure 1 3 Figure 1 4 Figure 1 5 Figure 1 6 Figure 1 7 Figure 3 1 Figure 3 2 Figure 3 3 Figure 3 4 Figure 3 5 Figure 3 6 Figure 3 7 Figure 3 8 Figure 4 1 Figure 4 2 Figure 5 1 Figure A 1 Figure A 2 Chirp Acoustic Profiling System xi List of Figures The DSP 665 Transceiver 1 4 The TTV 170 Series Tow Vehicle for Shallow Water Applications 2 5 GAGA RR ERR awe 1 4 The TTV 290 Series Tow Vehicle for Deep Water Applications Aa 1 5 The Hull Mount Array with AT 471 and AT 12D7 Transd cels RM 1 5 Industrial Grade Rack Mount 1 9 Monitor Keyboard and Mouse 1 9 Resolving Closely Spaced Layers 1 13 Location of Anchor 3 6 Mounting the Tail 5 3 6 DSP 665 Transceiver Front Panel 3 8 DSP 665 Transceiver Rear Panel 3 10 The Benthos Chirp Ill Server Dialog Box 3 17 Example Chirp Pattern T
33. e transceiver by pressing I on the POWER switch The POWER indicator will illuminate and the tow vehicle s transducers will begin transmitting WARNING Do not allow the tow vehicle to transmit continuously on deck for more than one half hour SECTION 3 Setup and Deployment Selecting and Installing the Sonar Data Acquisition and Display Software 3 16 TELEDYNE BENTHOS 2 On the front panel of the transceiver switch the CH 1 ANALOG IN switch to OFF Switch the CH2 ANALOG IN switch to OFF Switch the HF LF switch to OFF Switch the PREAMP GAIN dB switch to 0 o A On the rear panel of the transceiver switch the CH 1 HYDROPHONE T R switch to HYDROPHONE 7 Switch the CH 2 HYDROPHONE T R switch to HYDROPHONE Configuring the Chirp Server Parameters Perform the steps below to configure the Chirp Server parameters 1 Start the sonar data acquisition and display software NOTE Depending on the sonar acquisition and display software installed the following step may be different than what is described 2 Inthe sonar data acquisition and display software main window choose Recording Parameters from the File menu The Benthos Chirp Server dialog box opens as shown in Figure 3 5 NOTE The Chirp Ill Server dialog box does not have to be closed for any changes made to the settings in the dialog box to take effect Changes are applied immediately with the dialog box open
34. emporarily increase the receiver gains of both channels If required also increase the TVGs After the vertical streaks have been verified return receiver and TVG settings back to their original settings The predeployment checks are complete and the tow vehicle can be deployed However if it is not deployed immediately turn off the transceiver Bo 2280 Figure 3 8 Example Tap Test Display P N M664 0100 Rev B Chirp Acoustic Profiling System 3 23 Tow Vehicle Deployment AN Before deploying the tow vehicle a choice of tow cable and its length must be made based on the desired operating depth of the tow vehicle Once a tow cable is selected the cable is attached to the tow vehicle s tow point and the tow vehicle is hoisted and checked for proper balance When the proper balance is achieved the tow vehicle is launched from the stern of the vessel using a boom or an A frame and a winch Then the tow vehicle is lowered to a depth of only a few meters while its operation is verified WARNING Do not use the deck cable to hoist or tow the tow vehicle Although the cable is Kevlar reinforced and has a strength member it is not to be used for towing Only a separate steel cable or armored multi conductor tow cable may be used for this purpose Selecting a Tow Cable If the desired tow vehicle towing depth exceeds that which the tow vehicle can connect to the processor with the standard Kevlar reinforce
35. erator functions Chirp transmit pulse length user selectable from 5 0 to 60 0 sec Transmit repetition rate user selectable from 0 062 to 8 000 sec Transmit power control user adjustable from O dB to 21 dB of attenuation Preamplifier gain user adjustable from 0 dB to 42 dB Chirp or CW operation selection CW frequency selections Enable or disable channels Server IP address entry TCP port entry Internal or external trigger selection Rectified output selection Connect or disconnect to client Power switch P N M664 0100 Rev B Chirp Acoustic Profiling System 2 5 Power indicator Channel 1 transmit indicator Channel 2 transmit indicator Channel 1 analog switch Channel 2 analog switch Auxiliary input select switch Preamp gain switch Channel 1 hydrophone T R switch Channel 2 hydrophone T R switch Fuse External connections Channel 1 analog input Channel 2 analog input Low frequency auxiliary input High frequency auxiliary input External key input Key output Chirp hydrophone output Analog hydrophone output Preamplifier input Preamplifier output Channel 1 receive input Channel 2 receive input Hydrophone output Tow vehicle hull mount input Ethernet 10 100BaseT Power SECTION 2 Specifications DSP 665 Transceiver 2 6 TELEDYNE BENTHOS TTV 170 Series Tow Vehicle The TTV 170 Series Tow Vehicle is designed for use on small boats in relatively shallow water The TTV 172 is configured with a low frequenc
36. est Display 3 21 Location of TTV 290 Series Transducers and Hydrophone 3 21 Example Tap Test Display 3 22 DSP 665 Transceiver Functional Block Diagram 4 4 DSP 665 Transceiver Chassis 4 5 Location of the Transformer Jumper Boards 5 8 Major Components of a Typical Hull Mount System A 3 Inside Hull Transducer Array Configuration A 4 List of Figures TELEDYNE BENTHOS List of Tables Table 3 1 Table 3 2 Table 3 3 Table 3 4 System Manual Recommended Transmit Repetition Rate vs Depth Below Transducer 3 17 Chirp and CW Pulse Length Selections 3 19 Tow Speed vs 3 23 Tow Speed vs Cable 3 24 P N M664 0100 Rev B SECTION 1 Overview SECTION 1 Overview Chirp Acoustic Profiling System 1 3 integrated dual channel dual frequency sonar system that employs both chirp and conventional continuous wave CW technologies to produce high resolution subbottom profiles of both the shallow and deep subbottom layers The system is modular in design as it can be configured with a variety of tow vehicles as well as a hull mounted transducer array In addition the system will process and display data from a non chirp source such as a boomer or sparker in one channel while simu
37. hicle s transducers will begin transmitting WARNING Do not allow the tow vehicle to transmit continuously on deck for more than one half hour Lower the tow vehicle into the water For the TTV 290 Series Tow Vehicle loop lines through the forward port and starboard carrying handles to stabilize the tow vehicle while it is suspended Run the sonar data acquisition and display software Submerge the tow vehicle to a depth of two or three meters and then begin cruising at two to four knots Check the attitude and stability of the tow vehicle If it is not stable it may be in the ship s prop wash and it may be necessary to lower the tow vehicle to a deeper depth If the tow vehicle still does not stabilize when lowered to a deeper depth it may be necessary to move the tow cable to another hole on the tow point If the tow vehicle is stable and is operating correctly it can be lowered to its operational depth and the recording of data can begin P N M664 0100 Rev B Chirp Acoustic Profiling System 3 27 Connecting an Alternate Seismic Source gt The Chirp Acoustic Profiling system can be configured with non chirp alternate seismic sources For example an alternate non chirp seismic source can be connected to receive process record and display profile data These devices all connect to the DSP 665 Transceiver Refer to DSP 665 Transceiver Connections on page 3 7 for a description ofthe con
38. hould be inspected once a month and cleaned if necessary The inside of the transceiver should be inspected and cleaned once a year gt NOTE Keeping the air filters clean is important Dirty air filters will restrict the flow of cooling air to the hardware components which can cause heat damage failure or both Removing and Cleaning the Air Filter The transceiver has one air filter on the front panel and two air filters on the rear panel Refer to Figure 3 3 on page 3 8 for the location of the front panel filter and to Figure 3 4 on page 3 10 for the rear panel filters To remove the front panel filters remove the screws that hold the retention plate and then remove the plate and the filter To remove the filters on the rear panels first remove the snap in retention plates and then remove the filters Clean or replace the filters as required and then replace the retention plates on the front and rear panels Cleaning the Inside of the Transceiver To clean the inside of the transceiver loosen the quarter turn fasteners that secure the cover and remove the cover Inspect for any loose boards or connectors inside the box and then carefully vacuum any accumulated dirt and dust inside the box Replace the cover and secure it with the fasteners SECTION 5 Maintenance and Troubleshooting DSP 665 Transceiver Periodic Maintenance 5 4 TELEDYNE BENTHOS Tow Vehicle Periodic Maintenance Maintenance of the TTV 170 and TTV 290 Serie
39. ing steps if the TTV 290 Series Tow Vehicle is the connected tow vehicle refer to Figure 3 7 for the specific location of the transducers and the hydrophone array 6 Turn off the Channel 1 transmitter 7 Listen for the transmitted pulses from the high frequency transducer in the tow vehicle When the transmissions have been verified turn the Channel 1 transmitter back on 8 Turn off the Channel 2 transmitter P N M664 0100 Rev B Chirp Acoustic Profiling System 3 21 gt HORIZONTAL BARS a o a a a o u n s gt wi Figure 3 6 Example Chirp Pattern Test Display LOW FREQUENCY TRANSDUCERS HIGH FREQUENCY TRANSDUCER HYDROPHONE ARRAY Figure 3 7 Location of TTV 290 Series Transducers and Hydrophone Array SECTION 3 Setup and Deployment System Startup 3 22 System Manual 9 10 11 TELEDYNE BENTHOS Listen for the transmitted pulses from the low frequency transducers in the tow vehicle When the transmissions have been verified turn the Channel 2 transmitter back on With a wrench or similar blunt object perform the tap test by rapidly tapping the underside of the tow vehicle for 15 to 20 seconds in the area of the hydrophone arrays Examine the sonar displays They should look similar to those shown in Figure 3 8 with vertical streaks displayed for both channels If the vertical streaks cannot be seen t
40. ion of system parameters and a system startup procedure that includes tow vehicle deployment Section 4 Theory of Operation describes the circuit functions and signal flows at the circuit board level for the shipboard component of the system Section 5 Maintenance covers routine maintenance and includes some troubleshooting recommendations and instructions on how to check cables and transducers Section 6 Drawings includes assemblies wiring diagrams and cable drawings for the system Appendix A Hull Mount Installation Requirements includes a general overview of the requirements for installing a hull mount system System Manual P N M664 0100 Rev B Chirp Acoustic Profiling System Vii Notes and Warnings Where applicable special notes and warnings are presented as follows NOTE A referral to another part of this manual or to another reference a recommendation to check that certain criteria are met before proceeding further in a step or sequence or general information applicable to the setup and operation of the Teledyne Benthos Chirp Ill Acoustic Profiling System WARNING A reminder that dangerous or damaging consequences could result if certain recommended procedures are not followed Customer Service We welcome your comments and suggestions about this manual and about specific applications for the Chirp Ill Acoustic Profiling System and other Teledyne Benthos products Therefore please contact Customer
41. irp technology the side lobes are greatly reduced through matched filter processing which attenuates signals that do not correlate well with the transmitted pulse SECTION 1 Overview Chirp Technology 1 14 System Manual TELEDYNE BENTHOS The second factor that affects the image quality is the signal to noise ratio As the transmitted pulse travels through the water its amplitude becomes attenuated and falls below the noise level The Chirp Ill uses matched filter correlation processing to improve the signal to noise ratio and hence the quality of the sonar images Chirp Pulse Transmission and Reception Both subbottom channels of the Chirp 111 Acoustic Profiling System operate according to the same principles but one channel transmits and receives low frequency chirp pulses and the other transmits and receives high frequency chirp pulses The sequence of steps in the transmission and reception of the chirp pulses for both channels are summarized as follows 1 Using a digital signal processor DSP a linear FM pulse is generated 2 The signal is sent to a power amplifier which drives the subbottom transducer or transducer array 3 The subbottom transducer or transducer array transmits the pulse and returns are received by the hydrophone array Using separate transmitter and receiver arrays preserves linearity and allows simultaneous signal transmission and reception 4 Reflections at the hydrophone array are filtered and a
42. ivers the following performance features A greater dynamic range is attained as long FM pulses provide an additional 20 dB to 30 dB of dynamic range over conventional subbottom sonar systems Enhanced resolution is achieved with matched filter processing as compared to systems using standard processing in the same frequency band by correlating the return signals with a replica of the outgoing pulse Transmitted waveforms are repeatable from pulse to pulse The temporal resolution is constant both with range and penetration The pulse characteristics are programmable as the pulse length span of frequency sweep and phase amplitude calibration of the transmitted waveform can be varied without hardware changes and The sonar data can be stored for off line processing in SEG Y format on a hard drive a DVD or other high density storage device DSP 665 Transceiver The DSP 665 Transceiver incorporates two power amplifiers as well as filtering for separating the received signals The chirp and CW waveforms are generated by the transceiver and are amplified by the power amplifiers which drive the transducers Received signals are input to the transceiver filtered and then processed using matched filter digital signal processing applying continuous Short Time Fourier Transforms STFT for each sweep or transmit cycle The transceiver also includes a preamplifier with adjustable gain for amplifying the output of non chirp systems and two T R
43. l Low Frequency Sonar Transmitter transducer Power output Frequency range Transducer radiation Four Teledyne Benthos AT 471 low frequency transducers 1 6 kw 15 duty cycle at 3 5 kHz for 209 dB re 1 uPa 1 m nominal 4 kw maximum at reduced duty cycle Sweeps in the 2 kHz to 7 kHz band 45 conical High Frequency Sonar Transmitter transducer Power output Frequency range Transducer radiation Teledyne Benthos AT 14F7C high frequency transducer 90 watts 15 duty cycle at 17 kHz for 205 dB re 1 uPa 1 m nominal 4 kw maximum at reduced duty cycle Sweeps in the 10 kHz to 20 kHz band 30 P N M664 0100 Rev B Chirp Ill Acoustic Profiling System Sonar Receiver Receiver hydrophone Frequency band Hull Mount System 2 9 Teledyne Benthos AT 473D hydrophone 1 5 kHz to 40 kHz For deep water applications a hull mount array of 4 to 16 low frequency transducers and a high frequency transducer can be installed in a hull mounted sea chest The transducers perform both the transmit and receive functions The transducers are wired to a junction box which is permanently connected to the workstation through the Remote Controlled Transmit Receive Module The specifications that follow are for a hull mount system that incorporates 16 low frequency transducers and one high frequency transducer Low Frequency Sonar Transmitter transducer Power output Frequency range Transducer ra
44. l Server dialog box SECTION 3 Setup and Deployment Connecting an Alternate Seismic Source 3 28 System Manual TELEDYNE BENTHOS Connecting and Adjusting the Preamplifier One alternate seismic source can first be amplified by the preamplifier Perform the steps below to connect this source and adjust the preamplifier 1 Connect the alternate seismic source to PREAMP IN 2 Connect PREAMP OUT to the desired alternate seismic source input CH1 ANALOG IN CH2 ANALOG IN LF AUX IN or HF AUX IN as described below 3 Switch the PREAMP GAIN dB switch to the required gain setting Connecting One or Two Seismic Sources Operating at Greater than 1 5 kHz Perform the steps below to connect one or two alternate seismic sources operating at greater than 1 5 kHz Both seismic sources can be input simultaneously 1 Connect the alternate seismic source hydrophone to CH1 ANALOG IN or to CH2 ANALOG IN or connect a separate source to each CH1 ANALOG IN is Channel 1 CH2 ANALOG IN is Channel 2 2 Switch the HF LF switch to OFF 3 Switch the corresponding CH1 ANALOG IN or CH2 ANALOG IN switch to ON or switch both switches to ON if two seismic sources are connected Connecting One or Two Seismic Sources Operating at 1 5 kHz or Less Perform the steps below to connect one or two alternate seismic sources operating at 1 5 kHz or less Only one seismic source can be input at a time 1 Connect the alternate seismic source hydroph
45. l frequencies sweep in the 2 to 7 kHz band for the low frequency channel Channel 1 and in the 10 to 20 kHz band for the high frequency channel Channel 2 The CW frequencies are 1 5 kHz 2 5 kHz 3 5 kHz and 5 0 kHz for Channel 1 and 10 kHz 12 kHz 14 kHz 16 kHz and 20 kHz for Channel 2 The transmit gates which control the pulse length of the transmitted signals are output to the Transmitter board and are automatically set in accordance with the chirp or CW pulse information The transmit waveforms are also output to the Dual Receiver board and function as the diagnostic signals to assist in the isolation of any system failures The DSP board also inputs the digitized received sonar signals from the CPU board and if the data are chirp based performs matched filter processing of the data If the sonar data are CW based the DSP board determines the power spectrum of the sonar data by calculating the absolute value squared The DSP board then outputs the matched filtered or power spectrum sonar data to the CPU board Power Supply Board The Power Supply board provides 12 and 5 VDC power Transmitter Board There are two Transmitter boards in the transceiver one for the low frequency channel and one for the high frequency channel They amplify the chirp and CW transmit waveforms and drive the transducers on the tow vehicle and provide the T R network The transmit power level control input from the Front Panel board sets each of the t
46. ledyne Benthos Chirp III Server runs on the DSP 665 Transceiver Client Computer A client computer is optionally available from Teledyne Benthos This computer is an industrial grade rack mount PC with dual core processors as shown in Figure 1 5 The computer includes a monitor a keyboard and a mouse which are shown in Figure 1 6 The computer runs the sonar data acquisition and display software from any of the listed software manufacturers The software along with the required operating system can be optionally factory installed for a complete turn key system System Manual P N M664 0100 Rev B Chirp Acoustic Profiling System 1 9 Figure 1 5 Industrial Grade Rack Mount PC Figure 1 6 Monitor Keyboard and Mouse SECTION 1 Overview Client Computer 1 10 TELEDYNE BENTHOS Tow Vehicles System Manual The TTV 170 and TTV 290 Series Tow Vehicles are available for use with the Chirp III Acoustic Profiling System Each tow vehicle is designed to function optimally in specific applications In all the tow vehicles the low frequency transducers operate in the 2 kHz to 7 kHz band Channel 1 and the high frequency transducers operate in the 10 kHz to 20 kHz band Channel 2 TTV 170 Series Tow Vehicle The TTV 170 Series Tow Vehicle is designed for use on small boats in relatively shallow water it will operate in depths of up to 600 meters The tow vehicle is relatively small with a length of 37 0 inches and a cross sec
47. ltaneously processing data from the chirp source in the second channel T he Teledyne Benthos Chirp III Acoustic Profiling System is a fully The system comprises the Teledyne Benthos DSP 665 Transceiver shown in Figure 1 1 and a selection of tow vehicles including the TTV 170 Series Tow Vehicle shown in Figure 1 2 and the TTV 290 Series Tow Vehicle shown in Figure 1 3 A hull mount transducer array with AT 471 low frequency transducers and an AT 12D7 high frequency transducer also is available and is shown in Figure 1 4 The tow vehicles and the hull mount transducer array are each designed for specific applications hence together they serve a broad range of applications This section provides a general description of the system and its various configurations and identifies some of its important features A review of chirp technology also is presented and how the system makes use of its important advantages Main System Components DSP 665 Transceiver is the main surface component of the system It is a dual channel DSP 6652 or a single channel DSP 6651 high power transmitter and receiver that generates amplified chirp and CW waveforms to drive the tow vehicle transducers or hull mounted transducer array and receive the subbottom echoes The DSP 665 Transceiver also provides an Ethernet connection to a client computer running third party sonar data acquisition and display software The client computer is optionally supplied and the s
48. mplified 5 The sonar signals are digitized with a 16 bit A D converter 6 A digital processor in the transceiver one for each channel de chirps compresses the FM reflections using the matched filter the return signals from the subbottom hydrophone This correlates the received reflections with a compensated replica of the outgoing pulse The replica used in the matched filter contains the predetermined phase correction and amplitude weighting to correct anomalies in the transmitting and receiving hardware Signals that do not resemble the outgoing pulses are attenuated by this type of processing Compressed returns can be further processed with adjustable Time Varied Gain TVG and selectable spreading loss correction for amplitude losses from attenuation and absorption by the water P N M664 0100 Rev B SECTION 2 Specifications SECTION 2 Specifications Chirp Ill Acoustic Profiling System 2 3 performance specifications for the DSP 665 Transceiver the T he information in this section encompasses the physical and TTV 170 and TTV 290 Series Tow Vehicles and the hull mount system The recommended minimum requirements for the client computer are also included All specifications are subject to change without notification Client Computer Recommended Minimum Requirements Any computer meeting the recommended minimum requirements listed below can be used as the client computer A client computer is optionally available from
49. n e Horizontal tail fins e Tail fin mounting hardware Documentation package may be included in a shipping container Chirp Acoustic Profiling System System Manual e Software CD Manuals for optional components gt NOTE The TTV 290 Series Tow vehicle requires some assembly and is shipped with all the required components within the shipping container The TTV 170 Tow Vehicle is shipped complete Inspect the shipping containers for any signs of external damage Do not operate or deploy any equipment that appears damaged Immediately report any damage to Teledyne Benthos customer service and to the freight carrier gt NOTE For information on how to contact Teledyne Benthos customer service refer to Customer Service on page vii System Manual P N M664 0100 Rev B Chirp Acoustic Profiling System 3 5 AN Perform the steps below to unpack the DSP 665 Transceiver and the tow vehicle 1 Carefully remove the DSP 665 Transceiver along with the network and AC cables from its shipping container For a TTV 290 Series Tow Vehicle only 2 Using a screw driver pry off the retaining clips on the lid of the wooden box containing the tow vehicle and remove the lid to expose the compartment in the cover of the box 3 Remove the Kevlar reinforced deck cable the vertical and horizontal tail fins and the tail fin mounting hardware from the compartment 4 Remove the lag bolts at the bottom
50. ncluded When viewing this manual in Adobe Acrobat Reader click the page number to go directly to the page Step 1 Unpack and inspect the system components page 3 3 Step 2 Set up the DSP 665 Transceiver page 3 5 Step 3 Assemble the TTV 290 Tow Vehicle page 3 6 Step 4 Connect the DSP 365 Transceiver page 3 7 Step 5 Review the DSP 665 Transceiver operator functions page 3 13 Step 6 Select and install the sonar acquisition and display software on the client computer page 3 15 Step 7 Activate the system configure the server parameters and perform the predeployment checks page 3 15 Step 8 Select and connect an armored coaxial tow cable and launch the tow vehicle page 3 23 Quick Start Guide vi TELEDYNE BENTHOS Preface Congratulations on your purchase of the Chirp Ill Acoustic Profiling System The Chirp Ill delivers high resolution subbottom profiling using advanced chirp and conventional continuous wave CW technologies This manual is divided into seven sections and two appendices Section 1 Overview describes the major system components and explains chirp sonar technology Section 2 Specifications lists the specifications for the shipboard component of the system the available tow vehicles and a hull mount system Section 3 Setup and Deployment encompasses unpacking and setup of the system components descriptions of the connections and operator functions configurat
51. nected with a single coaxial cable either directly or through an optional winch and slip rings A third component the client computer is also optionally supplied and runs third party sonar data acquisition and display software DSP 665 Functional Description A functional block diagram of the DSP 665 Transceiver is shown in Figure 4 1 and the DSP 665 Transceiver chassis is shown in Figure 4 2 The transceiver communicates with the client computer over the Ethernet 10 100BaseT connection and connects to the tow vehicle over the coaxial cable The DSP 665 Transceiver amplifies the Channel 1 and Channel 2 chirp transmit waveforms and filters the hydrophone array or transducer output The transceiver also includes a preamplifier with adjustable gain for amplifying the output of an alternate non chirp source before it is input to one of the analog input channels of the transceiver In addition a transmit receive T R network is included which allows the transceiver to both transmit and receive from the same transducer The main functional components of the transceiver are the circuit boards all of which are located in the transceiver chassis SECTION 4 Theory of Operation DSP 665 Functional Description jenueyy 0010 9900 N d Transducer and Hydrophone Array Ethernet 10 100BaseT Connection Power Supply 12 5 VDC Power Supply 48 VDC Figure 4 1 DSP 665 Transceiver Functional Block Diagram
52. nectors and their functions Connect the alternate seismic source after making all of the connections to the transceiver as described in Connecting the Transceiver on page 3 11 There are four alternate seismic source inputs CH1 ANALOG IN for source frequencies greater than 1 5 kHz e CH2 ANALOG IN for source frequencies greater than 1 5 kHz e LF AUX IN for source frequencies of 1 5 kHz or less HF AUX IN for source frequencies of 1 5 kHz or less Therefore connect higher frequency seismic sources to the CH1 ANALOG IN and CH2 ANALOG IN connectors The transceiver will receive and process either one or both of these inputs simultaneously as selected by the operator Connect lower frequency seismic sources such as boomers and sparkers to the LF AUX IN and HF AUX IN connectors The transceiver will receive and process one of these two inputs at any one time as selected by the operator Connecting the Internal or External Trigger Source The alternate seismic source can be keyed by the transceiver or the transceiver can be keyed by the alternate seismic source If it is required that the source key the transceiver connect EXT KEY IN on the transceiver to the key output of the source If it is required that the transceiver key the source connect KEY OUT on the transceiver to the key input of the source NOTE If the alternate seismic source is to trigger the transceiver be sure to select External Trigger in the Benthos Chirp Il
53. ng properly refer to the functional and circuit board descriptions in SECTION 4 Theory of Operation for assistance The theory of operation will assist in tracing the source of the problem to the assembly or component level In addition refer to SECTION 6 Drawings for the assembly drawings and wiring diagrams Instructions are also provided in this section on how to check the cables and connectors how check the transducers and hydrophones and how to change the jumper settings on the Transformer Jumper boards WARNING Before disconnecting any cables or removing any boards from the DSP 665 Transceiver be sure the 100 125 VAC or 220 240 VAC 50 60 Hz power source is disconnected Cable Checks If it is suspected that a cable or connector is not functioning there are three simple checks that can be performed inspection for signs of arcing checking continuity and checking for a short circuit Arcing Check the cable and mold connectors for signs of arcing A black carbon material or voids in the rubber are signs of arcing If a connector has arced both the connector and its mating connector should be cleaned thoroughly to remove all carbon and dirt If the rubber has significantly eroded replace the connector Inspect the mating connector and replace it also if it shows the same symptoms Continuity Using an ohmmeter that can read 10 ohms or less check each wire in the cable for continuity Refer to SECTION 6 Drawings
54. nnel 1 when the HF LF switch is switched to LF Disabled when the HF LF switch is switched to OFF Inputs signals of 3 volts maximum at 1 5 kHz or less from a boomer or a sparker to Channel 2 when the HF LF switch is switched to HF Disabled when the HF LF switch is switched to OFF DSP 665 Transceiver Connections jenueyy 0010 7991 N d TRANSMIT CH1 CH1 ANALOG IN TRANSMIT CH2 CH2 ANALOG IN POWER PREAMP GAIN dB CHIRP Ill DSP 665 5 TRANSCEIVER 7 LF AUX IN FRONT PANEL AIR FILTER EXEKEYIN ES TE HF LF SWITCH OUS KEY OUT HF AUX IN PREAMP IN CHIRP HYDROPHONE ANALOG HYDROPHONE Figure 3 3 DSP 665 Transceiver Front Panel 8 6 SOHLN34 ANAGATSL Chirp Ill Acoustic Profiling System CHIRP HYDROPHONE ANALOG HYDROPHONE PREAMP IN PREAMP OUT 3 9 Outputs the analog signals that are input from the hydrophone array connected to the TRANSDUCER connector on the rear panel It is the same signal that is output on the HYDROPHONE connector on the rear panel Can be used as the input to a preamplifier Outputs the analog signals that are input from the hydrophone array of legacy acoustic profiling systems if connected to the BPR connector on the rear panel Can be used as the input to a preamplifier Inputs an analog signal Can be used to input the ANALOG HYDROPHONE or the CHIRP HYDROPHONE output Outputs the amplified analog input of PREAMP IN Can be used as an input to
55. nthos Inc when at the Teledyne Benthos Inc plant in North Falmouth Massachusetts all freight and insurance prepaid providing the product was not abused or operated other than in accordance with the Teledyne Benthos Inc instruction manuals With respect to the sale of Teledyne Benthos Inc oceanographic instruments which are pressure tested to rated depth prior to shipment Teledyne Benthos Inc does not assume responsibility for any damage due to leakage or implosion Teledyne Benthos Inc reserves the right to modify its warranty at any time in its sole discretion THIS LIMITED WARRANTY IS NOT TRANSFERABLE FROM THE ORIGINAL PURCHASER LIMITATION OF LIABILITY TELEDYNE BENTHOS INC MAKES NO OTHER WARRANTY REGARDING ITS PRODUCTS OR THE PRODUCTS OF OTHERS EITHER EXPRESS OR IMPLIED AND ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WHICH EXCEEDS THE FORGOING WARRANTIES IS HEREBY DISCLAIMED BY TELEDYNE BENTHOS INC AND EXCLUDED FROM ANY AGREEMENT MADE BY ACCEPTANCE OF ANY ORDER P N M664 0100 Rev B Chirp Ill Acoustic Profiling System iii TELEDYNE BENTHOS INC DOES NOT ACCEPT LIABILITY BEYOND THE REMEDIES SET FORTH HEREIN AND DOES NOT ACCEPT ANY LIABILITY FOR PRODUCTS NOT BEING AVAILABLE FOR USE LOST OR CORRUPTED DATA LOSS OF BUSINESS LOSS OF PROFITS LOSS OF USE OF THE PRODUCT OR ANY ASSOCIATED EQUIPMENT COST OF CAPITAL COST OF SUBSTITUTE OR REPLACEMENT PRODUCT FACILITIES OR SERVICES DOWN
56. of the box and lift the entire cover to access the tow vehicle 5 Remove the tiedown straps that secure the tow vehicle NOTE WARNING Use the tow vehicle carrying handles when removing the TTV 290 Series Tow Vehicle by hand with one person at each handle use only the tow point when removing the tow vehicle with a crane 6 Remove the tow vehicle from its container manually or using a crane For a TTV 170 Series Tow Vehicle only remove the Kevlar deck cable then remove the tiedown straps and carefully remove the tow vehicle from its shipping container DSP 665 Transceiver Setup Determine where the DSP 665 Transceiver and the optional client computer will be set up Secure them in place using tie downs if necessary near a 100 125 VAC or 220 240 VAC 50 60 Hz power source Be sure the back of each unit is accessible for connecting the cables If mounting the transceiver and the client computer in a 19 inch rack ensure that the rack is secure and that there is room behind the rack for proper air flow and for connecting the cables Support the units inside the rack using appropriate mounting brackets and secure the front panels to the front of the rack using standard 19 inch rack front panel mounting hardware SECTION 3 Setup and Deployment DSP 665 Transceiver Setup 3 6 TELEDYNE BENTHOS Assembling the TTV 290 Series Tow Vehicle Only the TTV 290 Series Tow Vehicles require some assembly as the tail fins must be installed
57. olution images of seafloor contours and subbottom layers In all sonar systems higher frequency content is invariably associated with an increase in resolution and in the case of a subbottom sonar a decrease in bottom penetration Chirp technology as implemented in the Chirp III Acoustic Profiling System reduces this trade off providing both high resolution and penetration Image Resolution For subbottom sonar sound energy transmitted to the seafloor is reflected off the boundaries between layers of different acoustic impedances The first boundary is between the water and the seafloor itself As layers of clay sand and various other sediments succeed each other they create other interfaces that reflect sound It is the energy reflected from these boundaries that the system uses to build the image The resolution of an imaging system is measured by its ability to separate closely spaced objects i e to detect discrete echoes returning from the interfaces between layers The vertical resolution of an acoustic subbottom profiler refers to the minimum distance that can be visually distinguished in SECTION 1 Overview Hull Mount Transducer Array 1 12 System Manual TELEDYNE BENTHOS the image produced by the system A sonar system with a 10 cm resolution will resolve layers that are at least 10 cm apart Layers spaced closer than 10 cm will be resolved by the system as one layer In a conventional single frequency system the limi
58. on The chirp transmit waveform transmit gate input and transmit power level control are optically isolated Dual Receiver Board The Dual Receiver board includes one low frequency channel and one high frequency channel Each channel amplifies the signals received by the tow vehicle transducers or hydrophone array through bandpass and highpass filters FL1 and FL2 respectively FL1 is for the high frequency channel Channel 2 and has 3 db cutoff frequencies of 10 kHz and 20 kHz FL2 is for the low frequency channel Channel 1 and has a 3 db rolloff frequency of 1 5 kHz This filter combined with a lowpass filter on the Dual Receiver board comprises a low frequency bandpass filter The Dual Receiver board also inputs diagnostic signals from the DSP board The gain of each receiver is controlled through the I O connections from the CPU board The gain can be set from 0 to 42 dB in 6 dB increments Front Panel Board The Front Panel board performs four primary functions the distribution of signals from the Rear Panel board to the DSP board the distribution of DC power to the Transmitter boards and the Rear Panel board the preamplification of the hydrophone array or transducer output and the interfacing with the operator functions and connectors on the transceiver front panel When keyed by the DSP board the Front Panel board outputs the chirp transmit waveform and transmit gate which are both input from the DSP board to each of the Tran
59. on Circuit Board Description 4 10 System Manual TELEDYNE BENTHOS There are two Transformer Jumper boards in the transceiver Each board interfaces a multi tapped output transformer T1 with a corresponding Transmitter board The primary voltage is input at TP1 TP6 Seven secondary taps are available for selection with jumpers JMP1 JMP7 With the low and high jumper positions selected the secondary voltage is output at TP7 and TP8 The table on the Transformer Jumper board assembly contains the standard and maximum jumper settings P N M664 0100 Rev B SECTION 5 Maintenance and Troubleshooting SECTION 5 Maintenance and Troubleshooting Chirp Acoustic Profiling System 5 3 primarily involves periodically inspecting and cleaning the DSP 665 Transceiver and washing and inspecting the TTV 170 or TTV 290 Series Tow Vehicle This section includes some simple procedures on how to perform these tasks and includes some troubleshooting recommendations that will assist in isolating and correcting problems encountered while setting up or operating system Instructions are also provided on how check the cables and transducers T he routine maintenance of the Chirp III Acoustic Profiling System DSP 665 Transceiver Periodic Maintenance The only required maintenance for the DSP 665 Transceiver is the inspection and cleaning of the air filters and the removal of any accumulated dirt and dust on the inside of the box The air filters s
60. onar data acquisition and display software is SonarWiz which is available from Chesapeake Technologies SECTION 1 Overview Main System Components 1 4 TELEDYNE BENTHOS CHIRP DSP 665 TRANSCEIVER Figure 1 1 The DSP 665 Transceiver Figure 1 2 The TTV 170 Series Tow Vehicle for Shallow Water Applications System Manual P N M664 0100 Rev B Chirp Acoustic Profiling System 1 5 Figure 1 3 The TTV 290 Series Tow Vehicle for Deep Water Applications Figure 1 4 The Hull Mount Array with AT 471 and AT 12D7 Transducers SECTION 1 Overview Main System Components 1 6 TELEDYNE BENTHOS The Teledyne Benthos tow vehicles are the subsea components of the system and are each individually designed to meet specific applications including the following For shallow water surveys the TTV 170 Series Tow Vehicle includes a choice of a dual channel TTV 172 with a single low frequency transducer a multiple element high frequency transducer and two hydrophone arrays arranged in a dipole configuration for a narrow receive beam or a single channel TTV 171 with a single low frequency transducer and the same hydrophone configuration For deep water surveys the TTV 290 Series Tow Vehicle includes a choice of a dual channel TTV 192 with four low frequency transducers a multiple element high frequency transducer and a linear hydrophone array consisting of eight transducer elements or a single channel TTV 191 wi
61. one to LF AUX IN or to HF AUX IN or connect a separate source to each LF AUX IN is Channel 1 HF AUX IN is Channel 2 2 Switch the HF LF switch to HF or LF depending on which seismic source to input NOTE With the HF LF switched to HF CH1 ANALOG IN is disabled when switched to LF CH2 ANALOG IN is disabled P N M664 0100 Rev B SECTION 4 Theory of Operation Chirp Acoustic Profiling System 4 3 System produces the high resolution sidescan sonar images is an important factor in ensuring the system is properly maintained and its maximum performance realized This section provides an overall functional description of the system components signal flows and processing from the generation of the transmit signals to the processing of the received signals Refer to SECTION 6 Drawings for the circuit board assembly drawings called out in this section N overall understanding of how the Chirp III Acoustic Profiling mm NOTE The descriptions in this section specifically encompass the dual channel system DSP 6652 Transceiver and TTV 172 Tow Vehicle However the descriptions also apply to the single channel system DSP 6651 Transceiver and TTV 171 Tow Vehicle except that in this system there is only one Transmitter board and one Transformer Jumper board compared to two each in the dual channel system The main components of the system are the DSP 665 Transceiver and the TTV 170 or TTV 290 Tow Vehicle They are con
62. orm and involve several procedures activating the system diagnostics which produces a chirp pattern test that checks the receivers listening for the transmitted pulses from each of the transducers one at a time and tapping under the tow vehicle to induce an acoustic signal in the hydrophone array To begin the predeployment checks first verify that the tow vehicle transducers are transmitting and then perform the steps below 1 Start the sonar data acquisition and display software 2 Inthe sonar data acquisition and display software main window choose Recording Parameters from the File menu The Teledyne Benthos Chirp Server dialog box opens as shown in Figure 3 5 on page 3 17 3 In the Teledyne Benthos Chirp Ill Server dialog box select the Chirp Pattern Test check box The tow vehicle will stop transmitting 4 Activate the sonar displays and select a range of 200 meters or greater for both channels in accordance with the instructions provided with the sonar data acquisition and display software Examine the sonar displays A chirp pattern will begin to scroll across the display for both channels and after several minutes the displays should look similar to those shown in the example in Figure 3 6 with black and gray horizontal bars of gradually increasing intensity 5 To return to normal operation clear the Chirp Pattern Test check box in the Teledyne Benthos Chirp Ill dialog box and then click Quit For the remain
63. ow cable at this time as depending on the distributed weight of the tow vehicle it may be necessary to use a different hole to balance the tow vehicle properly before deployment WARNING Do not use any of the carrying handles to hoist the TTV 290 Series Tow Vehicle Only the tow point should be used for this purpose 3 Hoist the tow vehicle and check for proper balance The tow vehicle should hang with its nose slightly above the tail Reconnect the tow cable to the forwardmost hole on the tow point if the nose is down or the next hole aft if the nose is much higher than the tail 4 When the tow vehicle is properly balanced secure the tow cable to the tow point by tightening the shackle bolt or tow cable retention bolt If a shackle bolt is used secure the bolt to the shackle with tie wraps or seizing wire to prevent the bolt from dropping out should it loosen 5 f the deck cable is used to connect to the tow vehicle secure it to the tow cable with a shackle and tie wraps SECTION 3 Setup and Deployment Tow Vehicle Deployment 3 26 A System Manual TELEDYNE BENTHOS Launching the Tow Vehicle Perform the steps below to launch the tow vehicle and verify its stability and operation The tow vehicle should be launched from the stern of the vessel using a boom or an A frame 1 Turn on the client computer 2 Turn on the transceiver by pressing I on the POWER switch The POWER indicator will illuminate and the tow ve
64. perate in continuous wave CW mode 7 Select the Internal Trigger option to use an internal key to trigger the sonar or select the External Trigger option to use an external key 8 Select the LF Enable check box to operate in the low frequency band 9 Select the HF Enable check box to operate in the high frequency band NOTE For dual frequency operation select both the LF Enable and HF Enable check boxes 10 Select the LF Rectify check box to rectify the output for a low frequency external analog signal input to CH1 ANALOG IN 11 Select the HF Rectify check box to rectify the output for a high frequency external analog signal input to CH2 ANALOG IN NOTE For the Transmit Power Gain Frequency and Pulse Length selections described below the left drop down list box corresponds to the low frequency channel Channel 1 the right to the high frequency channel Channel 2 12 Select the transmit power from the Transmit Power drop down list boxes The power level selections are from 0 for no transmitter attenuation to 7 for 21 db of transmitter attenuation in 3 db increments per step 13 Select the preamplifier gain from the Gain drop down list boxes The gain selections are from O for no gain to 7 for 42 db of gain in 6 db increments per step System Manual P N M664 0100 Rev B Chirp Acoustic Profiling System 3 19 14 15 Select the operating frequencies from the Frequency drop down list bo
65. phone array The transducers and hydrophones are interconnected with a block mold assembly that connects to the tow cable with a single connector The TTV 291 Tow Vehicle is configured with four AT 471 transducers for single channel low frequency operation P N M664 0100 Rev B Chirp Acoustic Profiling System 1 11 Hull Mount Transducer Array The Teledyne Benthos hull mount transducer array is configured in a hull mounted sea chest and is permanently connected to the DSP 665 Transceiver The system is designed primarily for deep water applications however the Remote Controlled Transmit Receive Module which is controlled by the transceiver allows for shallow water applications as well as it is configured with two remotely controlled gain stages that amplify weak return signals and attenuate strong return signals The hull mounted systems incorporate from 4 to 16 AT 471 low frequency transducers which operate in the 2 kHz to 7 kHz band and an AT 12D7 multiple element high frequency transducer that operates in the 10 kHz to 20 kHz band The transducers are wired through a junction box that connects to the Remote Controlled Transmit Receive Module and the transceiver The hull mount systems do not use a separate hydrophone as the transducers perform both the transmit and receive functions through a T R network in the module Chirp Technology Chirp technology uses digitally produced linear FM acoustic transmissions to produce high res
66. r Operator Functions 3 14 System Manual HF LF switch PREAMP GAIN dB switch TELEDYNE BENTHOS A toggle switch that when switched to LF enables the LF AUX IN input and disables the CH1 ANALOG IN input When switched to HF enables the HF AUX IN input and disables the CH2 ANALOG IN input When switched to OFF the CH1 ANALOG IN and CH2 ANALOG IN inputs function as described in DSP 665 Transceiver Connections on page 3 7 A rotary switch that selects either 0 15 or 30 dB of gain which is applied to the PREAMP IN input The rear panel operator functions are shown in Figure 3 4 on page 3 10 and are the following CH1 HYDROPHONE T R switch CH2 HYDROPHONE T R switch FUSE A toggle switch that activates the Channel 1 Transmit Receive function when switched to T R This allows the transceiver s Channel 1 to transmit and receive from the same transducer hence providing increased sensitivity for deep water applications When switched to HYDROPHONE the transceiver inputs the tow vehicle s hydrophone output A toggle switch that activates the Channel 2 Transmit Receive function when switched to T R This allows the transceiver s Channel 2 to transmit and receive from the same transducer hence providing increased sensitivity for deep water applications When switched to HYDROPHONE the transceiver inputs the tow vehicle s hydrophone output 3 amp 250 volt fuse P N M664 0100 Rev B Chirp
67. r hydrophone Frequency band Teledyne Benthos AT 14F7C high frequency transducer 90 watts 15 duty cycle at 17 kHz for 205 dB re 1 uPa 1 m nominal 4 kw maximum at reduced duty cycle Sweeps in the 10 kHz to 20 kHz band 30 conical Two 8 element hydrophone arrays 2 kHz to 100 kHz TTV 290 Series Tow Vehicle The TTV 290 Series Tow Vehicle is designed for use in deep water The TTV 292 is configured with four low frequency transducers a high frequency transducer and a hydrophone array The TTV 291 is configured for single frequency operation with the four low frequency transducers and the hydrophone array Physical Characteristics Construction Dimensions Weight in air TTV 292 Two part aluminum reinforced fiberglass 208 7 cm 82 in long and 38 4 cm 15 1 in by 53 3 cm 21 0 in in cross section 330 Ib 150 kg TTV 290 Series Tow Vehicle SECTION 2 Specifications 2 8 System Manual Weight in water TTV 292 Tether system Operating depth Towing speed TELEDYNE BENTHOS 210 Ib 95 kg Either of two Industry standard multi conductor cables Teledyne Benthos TWC 602 Kevlar reinforced with three twisted shielded pairs and three conductors for use with separate steel tow cable or Teledyne Benthos TWC 601 Rochester 301301 double armored with three coaxial pairs and three single conductors for use with winch and slip rings 1000 meters 1 to 8 knots operationa
68. ransmitter s output power level On each board the chirp transmit waveforms the transmit gate and the transmit power level control signals are input on J4 from the Front Panel board The Transmitter boards drive the transducers with the chirp transmit waveforms and are powered with 48 VDC which is input on J2 from the Front Panel board On each board the primary and secondary of output transformer T1 connect to J5 and J5 connects to J6 through a voltage divider and series resistor The voltage divider allows monitoring of the voltage output at TP5 and TP6 and the series resistor allows monitoring of the output current at TP4 and TP6 The transformer s primary has a center tap that is output on J7 and connects to an energy storage capacitor bank The output of the Transmitter on J6 connects to the transducers SECTION 4 Theory of Operation Circuit Board Description 4 8 System Manual TELEDYNE BENTHOS Received subbottom signals are input on J6 and applied to a differential amplifier through the T R network composed of high voltage coupling capacitors and diodes The diodes limit the input to the differential amplifier to 1 4 V peak to peak to protect the amplifier during the transmit burst The output of the differential amplifier drives an isolation transformer which outputs the received signals on J8 The Transmitter board includes several forms of protection current limiting thermal overload low frequency input and input isolati
69. s JMP1 JMP6 on the Transformer Jumper board that connects to the Channel 2 Transmitter board Two of the jumper sockets should have a jumper already installed 10 Reconfigure the jumper settings by removing and reinstalling as necessary the two jumpers in accordance with the HIGH and LOW jumper settings determined in Step 9 11 Replace the transceiver cover and the four cover screws 12 Slide the transceiver back into the rack and replace the four front panel screws SECTION 5 Maintenance and Troubleshooting System Troubleshooting SECTION 6 Drawings SECTION 6 Drawings Chirp Ill Acoustic Profiling System 6 3 DSP 665 Transceiver and the TTV 170 and TTV 290 Series Tow T his section includes the assemblies and wiring diagrams for the Vehicles In addition connection diagrams for the cabling in the TTV 170 and TTV 290 Series Tow Vehicles are included DSP 665 Transceiver Drawings The drawings listed below apply to the DSP 665 Transceiver C664 1283 C664 1263 B662 07747 C206 06523 B664 1233 C664 1243 B662 07777 B 250 199 D664 0091 CPU Board Assembly Front Panel Board Assembly Transformer Jumper Board Assembly Transmitter Board Assembly 1 30 kHz Power Supply Assembly 5 VDC and 12 VDC 1 8A Dual Receiver Board Assembly Rear Panel Board Assembly Multi tapped Transformer Assembly DSP 665 Wiring Diagram TTV 170 and TTV 290 Series Tow Vehicle Drawings The drawings listed below apply to the TT
70. s Tow Vehicles is required after each use including washing and inspection of cables and connectors After the tow vehicle is retrieved from service perform the steps listed below to clean and inspect the tow vehicle 1 Wash down the tow vehicle inside and out with clean fresh water and remove any debris that may have become trapped 2 Inspect the face of the transducers and hydrophone arrays Spray them with fresh water and then clean them with a mild non abrasive detergent being careful to remove any buildup After cleaning spray them again with fresh water NOTE Do not use an ammonia based cleaner such as a glass cleaner to clean the transducers and hydrophone arrays 3 Check for loose cable connections or other signs of damage The underwater connectors in the tow vehicle and on the deck cable should be kept clean Clean the connector pins and sockets with an alcohol wipe and before reconnecting any of the cables lubricate the pins with an O ring quality silicone or barium based lubricant gt NOTE Be careful not to get any lubricant on the faces of the transducers or the hydrophone arrays as doing so will severely degrade their performance System Manual P N M664 0100 Rev B Chirp Acoustic Profiling System 5 5 System Troubleshooting If while setting up or operating the system either the DSP 665 Transceiver or the TTV 170 or TTV 290 Series Tow Vehicle does not appear to be functioni
71. smitter boards In addition separate power level controls which also are input to the Front Panel board from the DSP board are output to the Transmitter boards The Channel 1 and Channel 2 received signals are input to the Front Panel board from the Rear Panel board and then output to the DSP board The DC power is input to the Front Panel board from the power supplies and then output to the Transmitter boards and the P N M664 0100 Rev B Chirp Acoustic Profiling System 4 9 Rear Panel board The preamplifier on the Front Panel board applies O 15 or 30 dB of gain to a signal that is applied to the PREAMP IN input The output of the preamplifier is applied to the PREAMP OUT output All the transceiver front panel operator functions which include the switches and indicators as described in DSP 665 Transceiver Operator Functions on page 3 13 connect to the Front Panel board In addition all the transceiver front panel connectors as described in DSP 665 Transceiver Connections on page 3 7 connect to the Front Panel board Rear Panel Board The Rear Panel board performs three primary functions the distribution of power to the hydrophone array preamplifiers and amplified chirp transmit waveforms to the transducers the filtering of the received signals from the hydrophone arrays or transducers and the interfacing with the operator functions and connectors on the transceiver rear panel DC power that is input to the Rear Panel boar
72. t also if it shows the same symptoms Tap Test Connect an oscilloscope to the pins of the transducer s connector Refer to SECTION 6 Drawings for the wiring diagrams Tap the face of the transducer with a screw driver handle or other smooth light object and note the waveform on the oscilloscope The peak voltage level should be in the hundreds of millivolts Note that for a transducer or hydrophone array the other transducers or hydrophones in the array should display a similar waveform and voltage for a similar tap furthermore if a digital oscilloscope is used it should be possible to observe that the phases are the same The hydrophone arrays each contain a built in preamplifier To perform the tap test first supply a DC voltage across the power input and power ground pins Refer to SECTION 6 Drawings for the wiring diagrams A 9 volt radio battery is ideal for this purpose P N M664 0100 Rev B Chirp Acoustic Profiling System 5 7 Short Circuit Test Only the AT 14F7C high frequency transducers can be tested for a short circuit The AT 471 low frequency transducers each have an internal transformer which appears as a short circuit when tested Disconnect the cable from the AT 14F7C high frequency transducer Using a megometer or a digital multimeter on the highest ohm scale measure the resistance of each pin of the cable or connector mold to every other pin All measurements should read greater than 10 megohms howe
73. t of its resolution is determined by the pulse length of the transmitted waveform In a multi frequency system such as the Chirp Acoustic Profiling System it is the bandwidth of the transmitted pulse that sets the system s theoretical resolution The theoretical sonar range resolution of a conventional single frequency system is calculated by multiplying the length of the pulse by the speed of sound and then dividing the product by 2 to account for the pulse s round trip range resolution pulse length x speed of sound 2 The pulse length equivalent of the de chirped swept frequency pulse equals the inverse of the bandwidth pulse length 1 bandwidth For example the duration of a pulse with a bandwidth of 9 KHz which is the bandwidth of a system configured to operate between 1 and 10 kHz is approximately 100 usec 1 9000 Hz 0 0001 sec Travelling at about 1540 m sec the sound will traverse approximately 15 cm in 100 usec Allowing for the round trip this results is a one way distance of 7 5 cm which is the range resolution In addition to the frequency and bandwidth of the insonifying beam other interrelated factors that affect the system s resolution are The horizontal width of the beam The tow speed of the vehicle The distance between the tow vehicle and the bottom The nature of the signal processing Figure 1 7 illustrates the vertical resolution achieved with a wide beam transducer that insonifies
74. th four low frequency transducers and the same hydrophone configuration A hull mount transducer array allows deep water surveys to be performed without the use of a tow vehicle A complete hull mount system includes the following Multiple Teledyne Benthos AT 471 low frequency transducers that are installed in a hull mounted sea chest and provide narrow low frequency transmit and receive beams A Teledyne Benthos At 12D7 High Frequency Transducer that is installed with the low frequency transducers and contains multiple internal elements that provide narrow high frequency transmit and receive beams and A Remote Controlled Transmit Receive Module that connects the transducer arrays to the workstation and includes a transmit receive T R network and programmable gain amplifiers which optimize performance in shallow water as well as in deep water and All required cables and a junction box for installation and wiring of the hull mount transducer array A system block diagram which depicts the functional relationships of the shipboard processing electronics and the tow vehicle or hull mount transducer arrays and hydrophones is shown in Figure 4 1 on page 4 4 System Manual P N M664 0100 Rev B Chirp Acoustic Profiling System 1 7 Advantages of Chirp Sonar Chirp sonar technology employs swept FM transmitted signals along with digital signal processing for matched filter processing of reflected energy The chirp technology del
75. tion of 12 7 by 17 1 inches and is constructed of a two part fiberglass shell and aluminum tow body The TTV 172 Tow Vehicle is configured for dual frequency operation and includes an AT 471 low frequency transducer an AT 14F7C high frequency 7 element transducer and two 8 element hydrophone arrays The hydrophone arrays are positioned in parallel thus forming a dipole configuration that provides a narrower beam in the athwart direction The transducers and hydrophones are interconnected with a block mold assembly that connects to the tow cable with a single connector The TTV 171 Tow Vehicle is configured with a single AT 471 transducer for single channel low frequency operation TTV 290 Series Tow Vehicle The TTV 290 Series Tow Vehicle is designed to operate in depths up to 1000 meters The body of the tow vehicle is 82 inches long with a cross section of 15 1 by 21 0 inches and is composed of a 316 stainless steel frame to which the upper and lower halves of a polyethylene shell are attached Three tail fins which attach directly to the frame provide stability while under tow The frame also includes a selection of tow points which extend through the top of the upper shell And the shell has four handles two on each side for carrying the tow vehicle The TTV 192 Tow Vehicle is configured for dual frequency operation and includes four AT 471 low frequency transducers an AT 14F7C high frequency 7 element transducer and an eight element hydro
76. ty Teledyne Benthos assumes no liability for damages losses or costs incurred consequentially through operation or malfunction of Teledyne Benthos products Title Title shall pass to the Buyer on delivery to the carrier at North Falmouth Massachusetts U S A Risk of damage or loss following such delivery shall be the Buyer s and Teledyne Benthos shall in no way be responsible for safe arrival of the shipment Title shall so pass to the Buyer regardless of any provision for payment of freight or insurance by Teledyne Benthos and regardless of the form of the shipping documents If shipment is consigned to Teledyne Benthos it shall be for the purpose of securing the Buyer s obligations under contract Changes Teledyne Benthos reserves the right to make changes to the design or specifications at any time without incurring any obligation to modify previously installed units In addition while considerable effort has been made to ensure that the information in this manual is accurate and complete Teledyne Benthos assumes no liability for any errors or omissions P N M664 0100 Rev B Chirp Acoustic Profiling System Quick Start Guide Use the 8 step procedure listed below to quickly set up activate and deploy the Chirp Acoustic Profiling System without having to read this entire manual The page numbers in SECTION 3 Setup and Deployment where specific information and instructions regarding each step can be found are i
77. ver a value as low as 1 megohm will allow the system to work temporarily as the short circuit is still developing WARNING Do not use a megometer to check the hydrophone arrays for a short circuit The hydrophone arrays each contain a built in preamplifier which could be damaged by the high voltage output of the megometer Before reconnecting any of the cables clean the connector pins and sockets with an alcohol wipe and then lubricate the pins with an O ring quality silicone or barium based lubricant Transmit Test Transmit into the transducer at full power It should be possible to hear the transmit burst as a sharp crisp pulse Listen for voltage arcing or hissing which indicates a faulty transducer It should also be possible to feel the transmit pulse with the hand Changing the Transformer Jumpers Each of the tow vehicles and the AT 471 transducer array used with the Chirp III Acoustic Profiling System require a specific jumper configuration on the two Transformer Jumper boards Hence when a different tow vehicle is connected to the DSP 665 Transceiver the jumper configuration on the Transformer Jumper board may require changing Before connecting a different tow vehicle refer to SECTION 6 Drawings for the assembly drawing of the Transformer Jumper board which is Drawing B662 07747 In addition refer to Figure 5 1 for the location of the Transformer Jumper boards and then perform the steps listed below to reconfigure
78. washer and lock washer and tighten with the 9 16 inch wrench P N M664 0100 Rev B Chirp Ill Acoustic Profiling System 3 7 DSP 665 Transceiver Connections Connectors are provided on the front and rear panels of the DSP 665 Transceiver for making all of the connections The front panel connectors are all BNC connectors and are shown in Figure 3 3 For information on the CH1 ANALOG IN CH2 ANALOG IN and HF LF switches called out below refer to DSP 665 Transceiver Operator Functions on page 3 13 The front panel connectors are the following CH1 ANALOG IN CH2 ANALOG IN EXT KEY IN KEY OUT LF AUX IN HF AUX IN SECTION 3 Setup and Deployment Inputs an external analog signal of 3 volts maximum at greater than 1 5 kHz to Channel 1 when the CH1 ANALOG IN switch is switched to ON Used to input analog signals from an alternate seismic source Disabled when the HF LF switch is switched to LF Inputs an external analog signal of 3 volts maximum at greater than 1 5 KHz to Channel 2 when the CH2 ANALOG IN switch is switched to ON Used to input analog signals from an alternate seismic source Disabled when the HF LF switch is switched to HF Inputs an external 0 5 volt 100 usec minimum pulse length signal that keys the transceiver Outputs a 0 5 volt 100 usec wide pulse at the start of each transmit cycle Inputs signals of 3 volts maximum at 1 5 kHz or less from a boomer ora sparker to Cha
79. xes The frequency selections for operation in chirp mode are 2 7 kHz for the low frequency channel 10 20 kHz for the high frequency channel For an expanded system other frequency selections are also available The frequency selections for operation in CW mode are 1 5 kHz 2 5 kHz 3 5 KHz and 5 0 kHz for the low frequency channel and 10 kHz 12 kHz 14 kHz 16 kHz and 20 kHz for the high frequency channel Select the pulse length from the Pulse Length drop down list boxes The available selections are listed in Table 3 2 Table 3 2 Chirp and CW Pulse Length Selections Chirp Pulse Lengths CW Pulse Lengths ms ms 5 0 0 5 10 0 1 0 15 0 1 5 20 0 2 0 30 0 3 0 40 0 4 0 50 0 5 0 60 0 6 0 16 If the tow vehicle is not to be deployed immediately click Quit to close the Benthos Chirp III Server dialog box and turn off the DSP 665 Transceiver by pressing O on the POWER switch If the tow vehicle is to be deployed immediately either click Quit to close the Benthos Chirp III Server dialog box or leave the dialog box open Changes can be made to the settings in the dialog box while acquiring data SECTION 3 Setup and Deployment System Startup 3 20 System Manual TELEDYNE BENTHOS Performing the Predeployment Checks The predeployment checks are recommended to verify that the system is functioning properly on deck before the tow vehicle is deployed The checks are easy to perf
80. y transducer a high frequency transducer and two hydrophone arrays The TTV 171 is configured for single frequency operation with the low frequency transducer and the hydrophone arrays System Manual Physical Characteristics Construction Dimensions Weight in air TTV 172 Weight in water TTV 172 Tether system Operating depth Towing speed Two part fiberglass shell with 6061 aluminum tow body 94 cm 37 in long and 32 4 cm 12 7 in by 43 4 cm 17 1 in in cross section 75 Ib 34 kg 45 Ib 20 kg Either of two Industry standard multi conductor cables Teledyne Benthos TWC 602 Kevlar reinforced with three twisted shielded pairs and three conductors for use with separate steel tow cable or Teledyne Benthos TWC 601 Rochester 301301 double armored with three coaxial pairs and three single conductors for use with winch and slip rings 600 meters 1 to 6 Knots operational Low Frequency Sonar Transmitter transducer Teledyne Benthos AT 471 low frequency transducer P N M664 0100 Rev B Chirp Ill Acoustic Profiling System Power output Frequency range Transducer radiation 2 7 400 watts 15 duty cycle at 3 5 kHz for 197 dB 1 uPa 1 m nominal 4 kw maximum at reduced duty cycle Sweeps in the 2 kHz to 7 kHz band 100 conical High Frequency Sonar Transmitter transducer Power output Frequency range Transducer radiation Sonar Receiver Receive

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