mm-7911 a0 - obc 12 transceiver

MM-7911 Installation & Maintenance Manual for Type 7911 OBC12 Transceiver

Head Office

Sonardyne International Limited Blackbushe Business Park Yateley, Hampshire GU46 6GD United Kingdom

T. +44 (0) 1252 872288 F. +44 (0) 1252 876100 E. [email protected] www.sonardyne.com

Section 0 MM-7911Page 3 of 20 Issue A - Rev 0

A M E N D M E N T R E C O R DAll amendments and additions will be issued with a new copy of this sheet,

recording the history of amendments.

Issue Revision Date Comments Section Page

A 0 14.11.97 Initial Issue All All


SECTION 11. OBC12 TRANSCEIVERS (DRG 7.1)

1.1 INTRODUCTION

OBC12 TRANSCEIVER, REMOTE TRANSDUCER AND CABLE FIG 1

The OBC12 transceiver is an acoustic transceiver, part of Sonardynes Ocean BottomCable acoustic positioning system. The transceiver is controlled from a PC runningSonardynes Genieapp software or the clients own navigation software. It is used to gatherrange data to groups of beacons that are attached to the Ocean Bottom Cable

Range data collected by the OBC12 transceiver from various known points around thebeacon, are used by the software to determine its absolute position.

The OBC12 transceivers are designed to be mounted near to the remote transducer .Theremote acoustic transducer is usually mounted through the hull of the ship. The transceiverand transducer are depth rated to 500 metres and so can be mounted on tail buoys, withthe remote transducer mounted into a towfish.

Four units that make up the transceiver assembly:

Remote transducer 7912-000-0X

Transducer cable 7911-006

Comms and power cable to the transceiver 7911-007

OBC12 transceiver 7911-000-0X

1.2 PHYSICAL FEATURES

The OBC12 is a Hard Anodised tubular unit 24.1(612mm long) and 7.0 (178 mm)diameter, weighing 11.5kg in air. There are two connectors on the top of the transceiverhousing. An 8 pin AGP male connector, providing power, communications and hard waretrigger to the unit. The other a 4 pin AGP female connector, providing power and signals tothe remote transducer. It is a watertight unit and is depth rated to 500 meters.


The OBC12 transceiver operates in the HF range between 35-55khz. It has 12 parallelchannels and 18 virtual channels. It uses RS232 communications but is also configurable toRS485 half duplex. The DC supply input voltage for the transceiver is 12-24v DC.

A facility also exists to enable an RSSI noise measurement to be taken via the hard wiretrigger link wires. This RSSI reading will give an indication of the ambient noise present inthe water.

1.3 REMOTE TRANSDUCER (DRG 7.2)The remote transducer is 6.5 (165mm long) and 3.5 (89mm) in diameter. This unit has a 4pin AGP Female connector on it, in order for the remote transducer cable (7911-006) to beconnected between the transducer and the transceiver. Its depth rating is 500 meters and itweighs 1.45 kg in air.

REMOTE TRANSDUCER FIG 2

1.4 SAFETY

The only likely danger associated with handling these instruments occurs if the insidebecomes pressurised. This danger can occur in any underwater instrument where waterleaks slowly in during immersion at great depth and cannot leak out again fast enough. Theair compressed inside can cause the endcap to fly off with some velocity when removed forservicing.

Ensure that care is taken when dismantling the unit and that the relevant instructions arefollowed.

The power supply is a maximum of 36v DC and the acoustic transmitter has an open circuitvoltage of 1800 Vpp AC.

1.5 LABELLING

The housing label for each unit carries unique identifying information:Type : 7911-000-01Serial Number : XXXXX/XX (Batch Number)12-24v DC INPUTRS232 comms (or RS485 Half Duplex)EXT TRIGGERROM : V5.XX (EPROM Version)


SECTION 22. TESTING

This section covers the testing of all transceivers.

An OBC12 Transceiver should be communications tested in the instrument room beforedeployment. If a known working transponder is available the unit can also have its acoustictransmission and reception tested.

2.1 OBC TEST EQUIPMENT

General Equipment

OBC12 Power/Comms Cables AGP-2008-Female (Cable No 7911-007, DRG No 7.3)PC running latest version of Genieapp or Clients softwareOBC12 Transceiver (7911-000-0X, DRG No 7.1)Remote transducer cable AGP-2004-Male to AGP-2004-Male (Cable No 7911-006, DRGNo 7.4)Remote transducer (7912-000-01, DRG No 7.2)12 / 24v DC power supply

2.2 SETTING UP

2.2.1 Connect a Power/Comms Cable from the OBC12 connector to the PC and power supply,with an in line 750 mA fuse.

2.2.2 Make sure that the power supply is earthed and that the screen of the power / comms cableis earthed. Also make sure that the earth pin of the RS232 connector is connected.

(FAILURE TO DO THIS MAY RESULT IN INCORRECT RANGES BEING RECEIVED BYTHE TRANSCEIVER.)

2.2.3 Connect the transducer cable between the transceiver and the transducer.

2.3 TESTING THE TRANSCEIVER COMMUNICATIONS (USING GENIEAPP SOFTWARE)2.3.1 Refer to OM-7918 section 11, for the setting up of comm ports in the Adif file for the

transceiver. Make sure each individual transceiver has its own comm port set.

2.3.2 Run the Genieapp software and go into the Database Menu, and then into the DevicesMenu. Check that the configuration, and serial port allocation is correct, including the Baudrate which is internally default set on the transceiver to 38400.

2.3.3 Exit back into the Main Menu and then go into the Test System Menu.

2.3.4 (Refer to OM-7918 Section 10.4) Use the Transceiver Communications Test, as this willrepeatedly test the communications link to one particular transceiver. Choose thetransceiver to test and type in its name and press ENTER.

2.3.5 The system then checks that the named device is listed in the ADIF database file. Forexample, if the device name TCVR is used but not listed in the ADIF file then the systemwarns:

WARNING: The Device Was Not Found: TCVR


2.3.6 The system checks to see if the device is a transceiver which can be checked with thisutility. If not, the system warns :

WARNING: Device is Not A Transceiver: TCVR

2.3.7 Finally the system checks that the device is connected to the system. If no communicationsare achieved the system warns :

WARNING: Cannot Communicate With Device: TCVR

2.3.8 If the transceiver is found correctly then commands are repeatedly sent to it.

e.g. 03@,TC:57.34003@,TC:57.34003@,TC:57.34003@,TC:57.340

If the communications link is working then the above will be seen on the screen. If thecommunications link is not working then the following will be seen in yellow:

2.4 TESTING THE TRANSCEIVER COMMUNICATIONS (WITHOUT GENIAPP SOFTWARE)2.4.1 Instead of using Genieapp make sure a suitable program is running on the PC such as

PCPlus, Procomm, or Hyper Terminal in windows 95.

2.4.2 Check that the transceiver is connected to the P.C.

2.4.3 Check that the Devices page is set up for the Serial comms are set to:

Baud Rate: 38400Stop Bit: 1Data: 8Parity: NONE

2.4.4 Send the following commands to the transceiver and check for replies :

SEND REPLYP1 CRLF P1 TDR PORT: 1P2 CRLF P2 TDR PORT: 2P3 CRLF P3 TDR PORT: 3

This will check that the P.C. is talking to the Receiver Boards 1,2,& 3. Another check thatcan be done is to send a Firmware Version command:

SEND REPLYFV CRLF FV VX.XX: HF MROV OBC12

(Refer to the OBC12 Transceiver Interfacing General Specification.)


2.5 TESTING THE ACOUSTIC RANGING (USING GENIEAPP SOFTWARE)2.5.1 Test communications to the transceiver.

2.5.2 Connect the remote transducer.

2.5.3 Run the Genieapp software Test System menu and Beacon range test.

2.5.4 This option is used to test acoustic ranging between a single transceiver and a singlebeacon.

2.5.5 The transceiver to test has first to be selected. The screen shows a list of availabletransceivers and prompts the user for a transceiver name :

Please Enter The Name Of The Device:

2.5.6 Type in the name of the transceiver to test and press ENTER.

2.5.7 The system then checks that the named device is listed in the ADIF database file. Forexample, if the device name TCVR is used but not listed in the ADIF file then the systemwarns:

WARNING: The Device Was Not Found: TCVR

2.5.8 The system checks to see if the device is a transceiver which can be checked with thisutility. If not, the system warns :

WARNING: Device is Not A Transceiver: TCVR

2.5.9 Finally the system checks that the device is connected to the system. If no communicationsare achieved the system warns :

WARNING: Cannot Communicate With Device: TCVR

2.5.10 If the transceiver is found then the system asks for the address of the beacon.

Please Enter The Address Of The Beacon:

Type in the address of the beacon to test and press ENTER.

2.5.11 The system then asks for the reply channel for the beacon.

Please Enter The Reply Channel For The Beacon:

Type in the reply channel for the test beacon and press ENTER.

2.5.12 If the beacon is found correctly then it is initialised and is used to interrogate the beaconselected.

Beacon Replies17 OK 300.8716 OK 300.8715 OK 300.84

2.5.13 If the beacon is not successfully found then the following will be shown :


2.5.14 If a spurious reply is sent back due to noise, the beacon reply may still be seen on thescreen as a reply, but the time taken for this range to be received may be less than 300ms.This is a good indication that the range is false and caused by serious noise problems.

Beacon Replies17 OK 240.8716 OK 245.8715 OK 242.84

2.5.15 Deploy beacon in water and check that the ranges received have a range greater than300ms, or greater than the turn around time of the beacon in use, e.g. a T.A.T. 300msshould get a range in the region of 300 +ms. Use low transmit power and high receivesensitivity. If a transceiver is found to be faulty see section 4.0 Disassembly and Section5.0 Diagnostics.


SECTION 33. INSTALLATION

3.1 MOUNTING THE TRANSCEIVER

3.1.1 The transceiver needs to be located as near to the remote transducer as possible. Asuitable location needs to be used as the transducer cable 7911-006 is only 6m long. Thiscable can be extended to 10m long if sliced correctly. The transceiver needs to be firmlyfixed down, either by substantial tie-wraps or ideally using jubilee clips.

3.1.2 When mounting the transceiver on a tailbuoy run the comms & power cable (DRG NO 7.3)to the PC and a suitable DC power supply.

3.2 MOUNTING THE TRANSDUCER

3.2.1 When mounting the transducer on the end of a through hull pole, a mounting plate may beneeded in order to match up different hole dimensions (see DRG 7.2). The AGP connectormay not fit through the top of the pole. In this case the cable needs re-splicing. Make surethat the splice is kept on the outside of the pole to prevent water ingress (see 6.3 forconnection and pin details & DRG No 7.4).

3.2.2 When mounting the transducer in a towfish make sure there is enough slack cable on thetransducer cable so the towfish is hanging on the chain and not hanging on the transducercable.

3.3 RE-SPLICING THE TRANSDUCER CABLE

3.3.1 When re-splicing the cable, make sure that the following wires are soldered to each otherand then individually heat-shrinked for insulation: RED to RED, BLACK to BLACK etc.

3.3.2 To ensure noise does not get into the system, ensure the cable screen is continued throughthe splice. Use foil or screening tape (copper tape) to connect one end of the screen to theother and wrap around the main conductors.

3.3.3 Wrap the splice in insulating tape, cover it with self amalgamating tape and then apply theinsulating tape on top.

3.4 NOISE PROBLEMS

3.4.1 Make sure that the transducer is deployed into the water before starting any noise tests.

3.4.2 The transceiver needs to be set to high gain and transmit power to high in the devices pageof the Sonardyne software.

3.4.3 Make sure there are no transponders in the water. There should be NO replies received. Ifnoise is present in any of the frequency groups used, spurious replies may be seen. Tocheck this make sure that the ADIF file used, has frequency groups 1 to 9 listed in it. Usethe GENIEAPP software and go into Navigate. Press page-down and check that no repliesare being received by the system in the Beacons Observation (QC) Page for frequencies 1to 9. Spurious ranges caused by noise will be inconsistent and may be less than 300ms.


3.5 NOISE ON THE COMMS LINES

3.5.1 This problem can occur and may give false ranges due to corrupt data. The solution to thisproblem is to increase the isolation between the P.C. and the transceiver.

3.5.2 If cable has been re-spliced, check to see that the screen on both halves of the cable hasbeen well connected together (see 3.3).

3.5.3 The 0V Float wire on the RS232 comms should be connected to 0V (pin 5 on 9 way and pin7 on 25way) going into the P.C. (see DRG No 7.3 for wiring details).

3.5.4 If the above makes no difference to the problem, use an optoisolated comms card, and / orrun a fibre optic link from the P.C. to the transceiver. (Consult a Sonardyne Engineer.)

3.5.5 Note: The power supply used may be noisy, to overcome this use a better isolated mainsconverter or try using a battery.

3.5.6 Make sure that the screening of the comms and power cable is connected to a suitableearth, such as the earthing point on the power supply if it has one, or ships earth. (Note: theships earth may be noisy.) Check to see what noise is present using an Oscilloscope.

3.5.7 Check that the comms and power cable is not running along side another power cable or acable that has bad insulation as this may produce cross talk.

3.5.8 If noise still affects the comms line, then the OBC12 may need to be changed to RS485half duplex comms (consult a Sonardyne Engineer).

3.6 RSSI NOISE MEASUREMENT READINGS

3.6.1 A measurement of the ambient noise can be taken using the RSSI output in the pre-ampstage. This measurement should be done with the electronics assembly in the housing, asthe noise generated by machinery and other electrical items can have a significant effecton the voltage measurement taken.

3.6.2 The OBC12 transceiver needs to be opened up and the electronics assembly removed inorder to get to the RSSI pin. ( see 4.2 ) The RSSI pin can be found on SK4 of the CPUboard 3, which is the receiver board furthest from the motherboard. SK4 is a 22 pin socket,with a RSSI output on pin 15 and 0v output on pin 18.

3.6.3 The RSSI output and 0v need to go to the orange and yellow wires usually used by thehardwire link, with a 100 Ohm resistor in series with the RSSI output. To do this, disconnectthe 2 pin Molex connector at the top of the Mother board and connect RSSI and 0v to thefemale part of the connector. Pins 15 and 18 should now be using the hardwire trigger wiresand passing the voltage reading up through the watertight connectors, to a multimeter.

3.6.4 The measurement taken should be around 0.3 - 0.6v for a good ambient noisemeasurement. If the voltage is any more than this then the noise level may be to high toget good acoustics.


SECTION 44. DISASSEMBLY

This Section covers the disassembly and rebuilding of OBC12 Transceivers.

The OBC12 Transceiver should be thoroughly washed in fresh water and cleaned of any oilor grease. It is recommended that a clean, cool, dry area is used for dismantling this unit.In hot environments water vapour is held in the air. The water may condense out inside theunit when submerged and cause corrosion.

OBC12 TRANSCEIVER DISASSEMBLED FIG 3

The above diagram indicates the OBC12 when disassembled. The parts that can be seen inthe picture are:

Chassis (containing the electronics)HousingGuard ( and relevant Flanges)Silicon Gel Bag

4.1 REMOVING THE TRANSDUCER / COMMS / POWER ENDCAP

4.1.1 The unit and connectors should first be cleaned of oil and grease and washed withfreshwater.

The working area should be clean, dry and well lit.

4.1.2 Take care not to stand in line with either end of the unit in case leakage has causedpressure to build up, which might push the end out at a high velocity.


4.1.3 Remove the guard that is protecting the 4 & 8 pin connectors by undoing 6 x M10 Nylocnuts on the underside of the flange. Remove the M10 washers and the plastic washers.Remove the top flange, guard and plastic retaining clip. Ease out the endcap carefullyusing the bottom flange to grip on to. Be careful not to use too much force as the chassiscontaining the electronics as he electronics may suddenly move and could cause damage.Care must also be taken to ensure that the endcap does not jump out at force, due topressurisation. Take care not to scratch the inside sealing face of the housing.

4.1.4 Wipe the "O" rings and grooves free of Vaseline to avoid picking up dirt.

4.2 REMOVING THE ELECTRONICS ASSEMBLY

ELECTRONICS ASSEMBLY, 3 CPU/RX BOARDS, MOTHER BOARD AND TX BOARD FIG 4

4.2.1 Remove the chassis assembly clear of the housing, so that the electronics can easily bedisassembled.

4.2.2 The electronics consist of three CPU receiver boards 7911-035-01, one motherboard 7812-036-02 and one transmitter board 7812-035-03.

4.2.3 The connections to these boards need to be removed. These consist of a 2 pin Molexconnector for the hard wire link. The 4 pin Molex connector to the transducer at the bottomend of the chassis. The 8 pin Molex RS232/485 connector and the 3 pin Molex powersupply connector at the top end.

4.2.4 The PCBs are supported by four rubber shock mounts. To detach the PCBs from these,remove two screws on either end of the motherboard. The whole electronic assemblyshould now lift out of the chassis.

4.2.5 To remove the CPU receiver boards from the motherboard remove the six screws andwashers and take off the first of the three boards. Then remove the next six stand-offspacers and remove the second board. Remove the next six stand-off spacers and six nutsand remove the third board. (Note: this board should be address number one which iswritten on the EPROM.)

4.2.6 To remove the transmitter board, remove six M3 Nyloc nuts and washers.

4.2.7 Inspect the sealing area of the bore of the housing tube for corrosion or scratches. Inspectthe chassis parts and PCBs for any sign of corrosion or leakage. The wiring can bechecked for continuity and insulation with the circuit boards removed. Check from theunderwater connectors to the Molex connectors.

4.2.8 Check the shock mount rubber parts for signs of wear or fatigue. Replace if necessary.


4.3 DISMANTLING THE 8 PIN POWER CABLE / COMMS AGP CONNECTOR

4.3.1 Make sure the 2 pin hard wire Molex connector, 8 pin comms connector and the 3 pinPower connectors have been removed from the transmitter and motherboard.

4.3.2 Remove the four caphead screws with a 6 mm Allen key. Cut away the heatshrink from thewires and desolder the connections.

4.3.3 Fitting a new connector is the reverse of the procedure. Use heatshrink on the solderedconnections.

UsePin Connections: Pin 1 green & yellow screen

Pin 2 red + Ve SupplyPin 3 white RS232 (TX)Pin 4 blue RS232 (RX)Pin 5 green COMMS 0 VOLTS FLOATPin 6 black - VE SUPPLYPin 7 orange EXT TRIGGER (-VE)Pin 8 yellow EXT TRIGGER (+VE)

(Refer to DRG No A3-7911-007)4.4 DISMANTLING THE 4 PIN TRANSDUCER AGP CONNECTOR

4.4.1 To remove the transducer endcap make sure the 4 pin transducer Molex connector hasbeen removed from the Motherboard. The tie wraps retaining the transducer wire onto thechassis must be cut.

4.4.2 Remove the four caphead screws with a 6 mm Allen key. Cut away the heatshrink from thewires and desolder the connections.

4.4.3 Fitting a new connector is the reverse of the procedure. Use heatshrink on the solderedconnections.Pin Connections: Pin 1 coax cable - Live

Pin 2 coax cable - GroundPin 3 screenPin 4 n/c

4.4.4 Rebuilding the endcap is the reverse of the procedure.

4.5 REFITTING THE CIRCUIT BOARDS

4.5.1 Fit the Transmit PCB 7812-035-03 first, to the correct side of the motherboard. This willengage the 6 pins of the connector in the middle of the board, 12 pins at the top of theboard and 8 pins at the bottom of the motherboard. The card fits over the six M3 studs,spaced off by the Nyloc nuts on the motherboard. Secure with six plain washers and M3Nyloc nuts. Connect the 8 pin RS232 Molex connector, and the 4 pin transducer Molexconnector.

4.5.2 Fit the first CPU card 7911-035 on the other side, engaging the three connectors, the 6-pinMotherboard plug in the middle and the single row and double row of pins from Tx Card atopposite ends of the board.

(Make sure that the first CPU card 7911-035 used is address No 1 which is written onthe EPROM ).

Fit the six M3 nuts to the studs and then the six M3 stand-off space connectors. Then fit thesecond CPU card, making sure it is address No 2. Fit six stand-off spacers and fit the thirdCPU card. This is CPU card address 3. Add the six M3 screws and washers.


4.5.3 Engage the slots of the Chassis End Plates with the free ends of the motherboard andclamp with Four M3 cap head screws and washers. Check that the hardwire trigger andpower lead are connected to their Molex connectors on the motherboard.

4.6 REFITTING THE TRANSDUCER / COMMS / POWER ENDCAP

4.6.1 The O rings should be removed and inspected for signs of corrosion. The grooves thathouse them should be cleaned of Vaseline and then reapplied with new Vaseline.

4.6.2 Add a silicon gel bag to the chassis assembly containing the electronics PCBs.

4.6.3 Slowly push the chassis into the outer housing, making sure that the bottom flange is addedfirst. The retaining plastic clip is then added to the outer housing once the chassis has beenfully pushed in.

4.6.4 The top Flange is added and the guard is then slotted into position and tightened up on theunderside using six M10 plastic washers followed by six M10 washers and Nyloc nuts.


SECTION 55. DIAGNOSTICS

5.1 TESTING THE COMPLETE OBC 12 TRANSCEIVER

There are no batteries within the unit, so on removal from storage the operational statusshould be the same as when it was put into storage. There are no external controls andthere is no functional testing which can be performed without the aid of other equipment.

Testing the unit is done using the suite of test routines in the System Testing menu.Operation of the software is described in section 10 of the 7918 Operations Manual.

The Transceiver Communications Test in System Testing can be used to testcommunications to any transceiver, as described in 2.3 and 2.4 for use without Gennieapp.This does not test the acoustic capability of the unit.

Transceiver Ranging Test is used to test a transceiver or transponder with another workingtransceiver. This test checks the acoustic performance and the communications of atransceiver. Any working transceiver can be used to test any other transceiver using thetest routines described in 2.5.

5.2 SUBSTITUTION METHOD

If testing of a closed OBC 12 Transceiver reveals any faults, the problems can only be inthe following modules:

Transmitter (Tx) PCB CPU PCB x 3

Transducer

Wiring and connectors

Mother board

Test results which indicate a specific function is at fault, such as transmission or receptiondo not conclusively point to one board or the other, because functions are spread acrossboth boards. The Tx PCB carries out mainly analogue functions and the CPU boardincludes the digital parts of both transmitter and receivers.

Substitute known functional modules into the faulty unit according to priority order ofactions in the following table. After each substitution re-test the unit.

NOTE: Testing the OBC 12 in an open environment e.g. on a bench , out of the housingcan result in electrical coupling giving spurious range measurements. The power supplyused needs to be earthed and the screen of the comms cable needs to be attached toearth. Also make sure that the 0v pin of the RS232 connector is connected.

WARNING: When using a lap top computer be aware that the noise generated by thescreen as this can cause problems if measuring receiver sensitivity when the OBC12electronics assembly is out of its housing.

Comms OK indicates satisfactory replies on the monitor to the Comms Test. If "NOTFOUND" is repeatedly received this is indicated by "NIL COMMS" on the table below.


To check that an individual CPU receiver board is working, use PC Plus and talk to eachindividual receiver board using the following commands:

p1 CRLF receiver board 1p2 CRLF receiver board 2p3 CRLF receiver board 3

(FOR COMMANDS TO THE OBC12 TRANSCEIVER SEE THE OBC12 INTERFACINGGENERAL SPECIFICATION)

5.3 TABLE OF SUBSTITUTIONS

COMMS RX TX ACTION

OK OK NIL 1. Substitute Pre-Amp/Tx board2. Substitute CPU receiver board 1

OK PARTIAL OK 1. Substitute Pre-Amp / TxChannels 1-4 2. Substitute CPU receiver board 1Channels 5-8 3. Substitute CPU receiver board 2Channel 9 4. Substitute CPU receiver board 3

5. Test / Replace the Acoustic Transducer

OK NIL OK 1. Substitute Pre-Amp/Tx2. Substitute relevant CPU3. Test / Replace the Acoustic Transducer

OK NIL NIL 1. Test / Replace Transducer2. Substitute Pre-Amp/Tx3. Substitute relevant CPU

NIL COMMS (Supply current correct) 1. Check wiring comms connector90mA@ 24v Quiescent 2. Substitute Pre-Amp/Tx

3. Substitute relevant CPU

NIL COMMS (Incorrect or no current) 1. Check wiring/connections1. Replace motherboard2. Substitute Pre-Amp/Tx3. Substitute relevant CPU

NOTE: When substituting the relevant CPU board, use PC Plus and the above mentionedcommands to see which CPU board needs changing.

The transducer may be given a simple electrical test if an AC electronic component bridgeis available. Disconnect the transducer and measure the transducers capacitance byconnecting pins 1 and 2 of the AGP lead to the component bridge and measure thetransducer's capacitance, it should be 7.5 - 9 nF. A very low value, or half the value,indicates a broken or open-circuit transducer.


SECTION 66. TECHNICAL NOTES

6.1 TECHNICAL SPECIFICATION

Acoustics:Frequency Band Sonardyne HF 35 to 55 kHz

Tx Frequencies Programmable by group numberSource Level 188-190 dbTx Beam pattern Omni Directional

Rx Sensitivity


Transducer Connector

Four pin AGP 2004F1 - Positive2 - Negative3 - Screen4 - N/C

6.4 OBC 12 SPARE PARTSItem Description DRG NO Qty Order

Code

CPU PCB 7812-036-02 631-3508Tx PCB 7812-035-03 631-3191Integral Transceiver Guard 7417-009-A2 750-0579AGP power B/Head Connector 2008-M 312-5416AGP Transducer B/Head Connector 2604-F 312-5618PCB ASSY Motherboard 7812-036-02C2 631-3508


SECTION 77. TECHNICAL DRAWINGS

7.1 OBC12 TRANSCEIVERS

7.2 REMOTE TRANSDUCER

7.3 MOUNTING THE TRANSCIEVER

7.4 MOUNTING THE TRANSDUCER

Head Office

Sonardyne International Limited Blackbushe Business Park Yateley, Hampshire GU46 6GD United Kingdom

T. +44 (0) 1252 872288 F. +44 (0) 1252 876100 E. [email protected] www.sonardyne.com

0. Contents1. OBC12 Transceivers (Drg 7.1)1.1 Introduction1.2 Physical Features1.3 Remote Transducer1.4 Safety1.5 Labelling

2. Testing2.1 OBC Test Equipment2.2 Setting Up2.3 Testing the Transceiver Communications (Using GENIEAPP Software)2.4 Testing the Transceiver Communications (Without GENIEAPP Software)2.5 Testing the Acoustic Ranging (Using GENIeAPP Software)

3. Installation3.1 Mounting the Transceiver3.2 Mounting the Transducer3.3 Re-Splicing the Transducer Cable3.4 Noise Problems3.5 Noise on the Comms Lines3.6 RSSI Noise Measurement Readings

4. Disassembly4.1 Removing the Transducer/Comms/Power Endcap4.2 Removing the Electronics Assembly4.3 Dismantling the 8 Pin Power Cable/Comms AGP Connector4.4 Dismantling the 4 Transducer AGP Connector4.5 Refitting the Circuit Boards4.6 Refitting the Transducer/Comms/Power Endcap

5. Diagnostics5.1 Testing the Complete OBC 12 Transceiver5.2 Substitution Method5.3 Table of Substitutions

6. Technical Notes6.1 Technical Specification6.2 Remote Transducer6.3 Connectors6.4 OBC 12 Spare Parts

7. Technical Drawings7.1 OBC12 Transceivers7.2 Remote Transducer7.3 Moutning the Transceiver7.4 Mounting the Transducer

mm-7911 a0 - obc 12 transceiver

Documents

remote transducer cable

remote transducer fig

remote transducer drg

acoustic transceiver

withthe remote transducer

introductionobc12 transceiver

007obc12 transceiver

transceiver assembly