Aquacom® MK-IV User Guide (rev. J)
Contents
1. oerte teet ynn e usc inte Specifications 52 2 donee esae e Gs c o HP RR Equipment Description sss Package Design 5c neo eee nta hts Included withthe MK IV 3 2 ttem ees Additional Components Sold Separately 2 3 1 Communication Cables see 2 3 1 1 ComRop S s onietteos eci cene 2 3 1 2 Spiral FOUT caro noi eerte 2 3 1 3 Shielded Cable eene rers 2 3 40 Diver Microphoh s isses niin eter 2 3 2 1 ME 16R Hot Mic 912086 000 2 32 2 Super Mic Depth Master sss 2 3 2 3 Preamplified Powered Microphones 2 3 3 Earphone Microphone EM Assemblies 2 3 3 1 EMA 2 911060 001 sene 2 3 3 5 EMA 2SM 911060 098 sss 2 3 3 3 EMX 2 911060 008 sese 2 3 3 4 EMX 2B 911060 026 esses 2 3 3 5 EMO 2 900096 686 sse 2 3 3 0 EMH2 1 911060 009 sses 2 3 3 7 EMH2 1SM 911060 100 2 3 3 8 EMS 2 911060 017 ssssne 2 3 3 5 LAR V Adapter 900282 000 2 3 3 10 EMD 2 911060 067 seen 2 3 3 11 EMD 2SM 911060 101 sss 2 3 3 2 EMDG 2 911060 076 sss 2 3 3 13 EMHI 1 900332 000 sess 2 3 3 14 EMHI ISM 900332 001 s 2 3 3 15 EMMT 1 911060 0902. Figure 3 Battery Panel Assembly Key 1 Retainer screws 4 2 Battery 3 Battery leads 2 4 Battery bracket 5 Retainer nuts 4 6 GFCI 7 Thermal breaker tightening 10 Connect the battery leads red positive black negative as marked on the battery IMPORTANT NOTE Always connect the positive red lead first 11 Reinstall the MK IV panel being careful not to contact the thermal breaker Fig 3 7 and GFCI 6 switches against the flange of the case doing so might trip the switches Note The proper setting for both switches is to ON indicated on the GFCI switch as the 1 showing instead of the 0 and the adjacent indicator C10 colored red instead of green 12 Secure with moderate tightness the panel to the case with the fourteen screws and seals 13 Reconnect all devices to the front panel 3 2 AC POWER To operate the MK IV using AC power connect the supplied AC power charging cable to the panel connector Fig 2 10 Connect the cable s power plug to an AC power outlet that supplies 90 240 volts at 50 60 Hz Operation of the unit with AC power will supply charging current to the battery See Section 3 1 1 for safety precautions Note The standard AC power cable has a plug compatible with the standard electri cal outlets used in the U S A However if you need a plug for a different region of the world appropriate power cords are available from OTS or your OTS dealer 32 1 ELEC
3. RECORD OUT A four pin military style MS plug for connecting a record ing device see Section 4 2 Step 5 The mating connector is provided with the MK IV AUX SPEAKER A four pin military style MS plug for connecting an external auxiliary speaker see Section 4 2 Step 5 The mating connector is provided with the MK IV HSU A six contact military style MS receptacle for connecting a helium speech unscrambler HSU SPEAKER VOLUME Control knob for adjusting the audio volume of the front panel speaker and an external speaker if connected A full counter clockwise rotation past the detent turns off the speaker Panel speaker The front panel speaker for listening to the divers commu nications without a headset Speaker switch A switch for turning on and off the panel speaker 19 Panel screw 1 of 14 These fourteen 10 32 Phillips screws secure the panel to the case They should be maintained at moderate tightness 10 SECTION 3 SUPPLYING ELECTRICAL POWER The MK IV 3 Diver Intercom provides three options for power supply the internal RB 1 battery 90 240 volts AC power at 50 60 Hz or an external 12 volt DC power supply The best option for you will depend on your particular application see Section 4 2 for information on setup of the MK IV 3 1 BATTERY POWER Inside the MK IV is an RB 1 six cell lead acid battery which supplies 12 volts at 5 0 amp hours The RB 1 is the latest in state of the art battery tech
4. sss 2 3 3 06 EMMT ISM 911060 102 2 3 3 17 EMMT 2 911060 091 sees 2 3 3 18 EMMT 2SM 911060 103 2 3 4 HHM IV Hand Held Microphone 2 3 5 Umbilical Adapters ete Punctlofs eiit corper Toe hea b Do IPS Supplying Electrical Power eee laddove 3 1 1 Battery Charging iis eee a eee 11 3 1 2 Battery Replacement sss 12 DAMM elg 13 3 2 1 Electrical Safety Mechanisms ssssssss 14 3 2 1 1 GFECLI ions since bor tr are 14 32 12 Thermal Breaker esses 15 3 3 External DC POWGE issto oe irm e rir pP Red 15 Section 4 Operation iona peine re entree ERR ee ERE IPS 16 4 1 Adjustments and Controls seen 16 4 1 System POWeE o unco nci rrr teta rtr repere 16 4 1 2 Diver Controls opisir sro eee ehe en 16 4 1 2 1 Diver Audio Volume Controls 16 4 1 2 2 INAC Control sese 16 4 1 2 3 Microphone Type Selection 17 41 24 Diver PTT Control 18 4 1 3 Tender Control seieessesisde feast veedesees etree rte 18 4 1 4 Speaker Power and Volume esses 19 MEME EE 19 43 R GceptiOnz sooo o HERE HR E Ge D HERREN ERE NER 21 AA Transisi ON S55 oerte et rare Tar ER CINE EGO RE PERDRE ERE EEE 22 4 5 Reco
5. Aquacom MK IV 3 DIVER INTERCOM Full Duplex Surface Station for Underwater Communications on a a cw f BacocobocoPo OOo 3 loo mms AQUACOM a OMK IV 3 DIVER INTERCOM A DIVER 1 DIVER 2 DIVER 3 NA ON A to jw vo yw Yo yw par e a onde EE LEX LES E ere Qi UMBILICAL g ASA E neconb our O b POWER t Technology in Depth Undersea Systems International Inc dba Ocean Technology Systems NOTICE This manual and the information contained herein are provided for use as a main tenance and operation guide No license or rights to manufacture produce and or sell either the manual or articles described herein are given Undersea Systems International Inc dba Ocean Technology Systems hereinafter referred to as OTS reserves the right to change specifications without notice It is recommended that all users read and fully understand this manual before using the MK IV 3 Diver Intercom All statements technical information and recommendations herein are based on tests we believe to be reliable but the accuracy or completeness thereof is not guar anteed and the following is made in lieu of all warranties expressed or implied including the implied warranties of merchantability and fitness for p
6. durable and rugged and require less maintenance than standard microphones although they often have lower fidelity with somewhat diminished dynamic range and speech intelligibility Powered microphones are available separately with two contact connectors or can be custom fitted with earphones depending on your particular requirements For information on available powered microphones contact OTS or your local OTS dealer 2 3 3 EARPHONE MICROPHONE EM ASSEMBLIES We offer our standard microphones integrated into earphone microphone EM assemblies designed to fit the communication port of full face masks FFMs produced by various manufacturers Table 1 is a compatibility chart of some of the standard non powered EM assemblies available for use with a ComRope connected to the MK IV 3 Diver Intercom Note If you have a diving helmet or mask that is not on the compatibility chart contact OTS or your local OTS dealer for availability or for information on custom EM assemblies The following are full descriptions of each of the EM assemblies listed in Table 1 2 3 3 1 EMA 2 911060 001 The EMA 2 EM assembly is designed for all Divator MKII AGA full face masks FFMs It has two ceramic earphones with holders an ME 16R Hot Mic a Hi Use connector and a push to talk PTT but ton The assembly is installed into the Divator MKII FFM communication port 2 3 3 2 EMA 2SM 911060 098 The EMA 2SM EM assembly is designed to be install
7. water from entering the case 4 7 HELPFUL HINTS These guidelines are provided to help you understand how best to use the MK IV 3 Diver Intercom 1 Before diving operations begin check to ensure the microphone earphone and wiring connections are secure and operating properly Ninety percent of all problems in underwater communications are due to a connection problem 2 Ifyou will use battery power always check the battery power level before the dive and recharge the battery if necessary 3 Secure the MK IV if using it on a vessel that is rolling about Strain relieve the umbilical s diver intercom cables so they will not pull on the MK IV 4 Ensure the umbilicals are dressed out so as not to trip anyone 5 When talking to divers keep in mind they have many things happening while underwater It is best to get the diver s attention before giving him a message e g Alpha Diver Alpha Diver this is Topside come in Alpha Diver The 22 diver should then respond to inform you that he is listening e g Topside this is Alpha Diver go ahead Avoid excessive tender to diver volume Most of the time when there is too much volume the diver will hear distortion and ask for more volume Speak slowly in one brief continuous sentence Speaking in short sentences gives divers a chance to take a breath and still receive a clear message When communicating with divers it is a good idea to have the divers repeat y
8. TRICAL SAFETY MECHANISMS The MK IV provides two 13 mechanisms for electrical safety when AC power is used a GFCI and a thermal breaker These allow for the remote possibility of an electrical failure that could otherwise present a risk of electrical shock Such an event is extremely unlikely but if it were to occur the safety mechanisms would immediately deactivate the unit s power as a precaution to prevent personal injury or damage to the MK IV 3 2 1 1 GFCI The GFCI ground fault circuit interrupter protects the divers by immediately cutting off power to the unit in the unlikely event of a system failure such as failure of the power supply Fig 4 6 that could otherwise send excess AC current down the communications lines to the divers The GFCI trips to deactivate the power when the AC current is diverted to a ground The GFCI can be accessed for troubleshooting or testing To do so it is necessary to remove the panel assembly follow steps 1 4 of Section 3 1 2 IMPORTANT NOTE Because of the possibility of electrical shock when the panel is opened the GFCI should be accessed only by a qualified technician furthermore the MK IV must be in a dry environment and on a stable surface Refer to Figure 3 Item 6 for the location ofthe GFCI A green LED Fig 4 2 dimly illuminates to indicate the GFCI is active A status window Fig 4 3 shows a red color if the GFCI is active or green if it has been tripped to deactivate AC
9. a second twisted shielded or unshielded pair The unshielded pair is used for the earphones while the balanced twisted pair is used for the microphone Unlike spiral four cable little can go wrong with this system provided the microphone is connected to the shielded twisted balanced cable 2 3 2 DIVER MICROPHONES See Figure 1 for examples of non powered and powered preamplified micro phones 2 3 2 0 ME 16R Hot Mic 912086 000 The ME 16R Hot Mic Fig 1A is a 150 ohm water resistant microphone element It is a state of the art dynamic microphone element designed to give you long trouble free use and the highest intelligibility possible Although the Hot Mic is trouble free it should be maintained Rinse it with freshwater after use to get all dirt debris or salt water from the grill Dry it with a clean soft towel If the element ever needs to be replaced it is easily removed by unscrewing the two small screws located on its base Getting the microphone wet does not harm it However the microphone element canonly withstand an 8 to 10 foot depth pressure differential If you removed your diving FFM at the back of the boat and the microphone became wet there would be no problem but ifthe FFM with element dropped more than 8 to 10 feet into the water the change in pressure probably would damage the microphone element In tests we have taken off the FFM at 30 feet and replaced it still at 30 feet without any problem b
10. ath the panel and the o ring seal between the case and lid to assure they are clean and show no signs of deterioration 8 Inspect the fourteen seals that are underneath the screws and washers Fig 2 21 for signs of damage Replace them as necessary see the Appendix p 27 Item 5 9 Ifthe battery has not been used for a long time we suggest six months recharge it to maintain its life If your organization has established a formal Preventive Maintenance System PMS program the steps above can be incorporated into your regular scheduled maintenance program but should be done frequently 52 TROUBLESHOOTING The MK IV was designed as high quality communications equipment Nevertheless as with any electronic equipment failures occasionally may occur Table 4 provides a list of some problems that might occur possible causes and our recommended solutions to attempt If you are experiencing a performance failure of the MK IV that is not mentioned in Table 4 or if you have attempted the suggested solutions and the failure persists contact OTS or your local OTS dealer for consultation or repair see p 28 for OTS contact information If you need to replace any components or parts refer to the Appendix for a list of spare parts and components available from OTS 24 Table 4 Troubleshooting Problem Probable Cause Remedy No power Battery exhausted Battery leads loose Defective ON OFF switch Board connect
11. e Headphone impedance output Protection circuits Battery type Battery life Operating temperature Storage temperature Cabinet material Front panel material Housing dimensions Weight 90 264 V AC 47 63 Hz 5 amps DC 125 mA 16 watts max 4 watts per diver 2 watts each for tender headset and speaker 300 4000 Hz Non powered 150 ohms 300 ohms GFCI 10 mA through ground path Thermal circuit breaker 2 A slow trip Rechargeable lead acid 12 V 5 Ah 14 hours continuous use full charge 40 C to 50 C 40 F to 122 F not charging batteries not mains power 40 C to 40 C 40 F to 104 F w mains power and charging Note Room temperature recommended for charging 25 C to 65 C 13 F to 149 F Molded composite 0 080 stainless steel powder coated Height Lid on 14 1 2 inches Lid off 8 1 2 inches Width 14 inches Depth 12 1 2 inches 28 lbs SECTION 2 EQUIPMENT DESCRIPTION 2 1 PACKAGE DESIGN The Aquacom MK IV 3 Diver Intercom is housed in a sturdy impact and rust resistant fiberglass case with stainless steel latches The case is opened with a counterclockwise rotation of the handles on the two butterfly latches that secure the lid the lid can be fully opened and even removed easily at the hinge The configuration of the multiple sets of feet on the case allows the unit to stand safely with the panel facing upward or forward The connectors and control
12. e the MK IV is a four wire round robin system received communications can be heard while the tender is transmitting and pressing the push to talk PTT button on the headset to transmit is unnecessary although the PTT button on the optional hand held microphone must be pressed 4 5 RECORDING COMMUNICATIONS If you would like to record the communications attach one of the supplied MS con nectors to the cable of the recording device according to the instructions provided in Step 5 of Section 4 2 Setup Plug the recorder connector into the panel Fig 2 15 Ensure the recorder is recording when the MK IV is operated All sounds outputted to the speaker will be recorded at line level 4 6 AFTER THE DIVE After each use be sure to disconnect all the connectors from the MK IV panel and cover the panel connectors with the attached dust caps to protect them If you have been using the battery for power recharge the battery for the next use Follow the preventive maintenance instructions presented in Section 5 1 to maintain your MK IV in optimal condition If the MK IV is going to be transported airborne open both safety vents to depres surize the unit s interior during flight The valves are located on the upper and lower halves of the case s front with the panel facing upward and are opened by fully counterclockwise rotation Before using the MK IV again close the ventilation valves by rotation fully clockwise to prevent
13. ed into all Divator MKII AGA FFMs It consists of two ceramic earphones with holders a Super Mic a Hi Use connector and a PTT button The assembly is installed into the Divator MKII FFM communication port 2 3 3 5 EMX 2 911060 008 The EMX 2 EM assembly is designed for the EXO 26 original FFM It consists of two dynamic earphones an ME 16R Hot Mic a Hi Use connector and a PTT button 2 3 3 4 EMX 2B 911060 026 The EMX 2B EM assembly is designed for the EXO 26 standard full face mask It is similar to the EMX 2 but fits the balanced regulator version of the EXO 26 with an oral nasal cavity 2 3 3 5 EMO 2 900096 686 The EMO 2 EM assembly is designed to be in stalled into the Ocean Reef NIRA Neptune FFM It has two earphones with holders a Hot Mic a Hi Use connector and a PTT button It is installed into a port on the side of the FFM 2 3 3 6 EMHZ2 1 911060 009 The EMH 1 EM assembly is optionally included with the HM 2 mouth mask It has one head strap one ceramic earphone a Hot 6 Table 1 Compatible EM Assemblies with Standard Microphones Earphones Part Num Micro Sin Model Number ber phone gle Dual Mask Type EMA 2 911060 001 Hot Mic x All Divator MK II FFMs EMA 2SM 911060 098 ee x All Divator MK II FFMs EMX 2 911060 008 Hot Mic x EXO 26 original FFM EMX 2B 911060 026 Hot Mic x EXO 26 standard FFM EMO 2 900096 686 Hot Mic x Ocean Ree
14. f FFM EMH 2 1 911060 009 Hot Mic x HM 2 mouth mask EMH2 1SM 911060 100 meee x HM 2 mouth mask EMS 2 911060 017 Hot Mic x ScubaPro FFM deor 900282 000 rame x LAR V mouthpiece EMD 2 911060 067 Hot Mic x M 48 SuperMask FFM EMD 2SM 911060 101 rud x M 48 SuperMask FFM EMDG 2 911060 076 ME 500 x ION Panorama Moye Dive EMH1 1 900332 000 Hot Mic x HM 1 mouth mask EMH1 1SM 900332 001 DE x HM 1 mouth mask EMMT 1 911060 090 Hot Mic x Mantis FFM EMMT 1SM 911060 102 id x Mantis FFM EMMT 2 911060 091 Hot Mic Mantis FFM EMMT 2SM 911060 103 ae x Mantis FFM Mic a Hi Use connector and a PTT button located on the HM 2 mask 2 3 8 7 EMH2 1SM 911060 100 The EMH 1SM EM assembly is optionally included with the HM 2 mouth mask It has a head strap one ceramic earphone a Super Mic a Hi Use connector and a PTT button located on the HM 2 mask 2 3 3 8 EMS 2 911060 017 The EMS 2 is an EM assembly designed to be installed into a ScubaPro FFM It consists of two earphones with holders a Hot Mic a PTT button and a Hi Use connector 2 3 3 LAR V Adapter 900282 000 This adapter is placed between the in halation hose and LAR V bite mouth DSV T bit assembly It is designed to allow basic words to be transmitted without the need for a full or half mask It consists of one earphone an ME 500 microphone a Hi Use connector and a PTT button 7 2 3 3 10 EMD 2 911060 067 The EMD 2 EM assembly is designed to be installed in
15. fied microphones and standard non powered microphones used by the divers See Section 2 3 2 and contact OTS or your local OTS dealer for informa tion on our selection of preamplified and dynamic microphones The MK IV has a toggle switch to select the type of microphone used by the divers Fig 5 When the switch is set for use of a power mic the red mic power indicator LED Fig 2 8 on the panel illuminates Power is sent to the microphone inputs and amplification is reduced to accommodate the preamplified microphone Ifa non powered microphone e g a Hot Mic or Super Mic is used while the microphone selection switch is in the power mic position the microphone will still operate but with less volume due to the reduced amplification Current limiting resistors in the circuit will prevent excessive current from flowing through low impedance microphone elements However we do not recommend this operation To set the microphone type selection switch follow these instructions 17 1 Ensure the power switch Fig 2 11 is toggled to the off position If the unit is connected to an external power source unplug the power cable from the power source 2 Disconnect all devices attached to the front panel 3 Using a 2 Phillips screwdriver remove and set aside the fourteen panel screws Fig 2 21 and neoprene seals 4 Using the two handles Fig 2 14 remove the front panel The MK IV s internal hardware and electron
16. ge of the external DC power source falls below that of the internal bat tery the MK IV will begin to draw current from both power sources Therefore the battery level indicator Fig 2 13 will monitor the voltage of both the internal battery and the external DC source SECTION 4 OPERATION The Aquacom MK IV 3 Diver Intercom while providing a variety of powerful functions and features is relatively simple to set up and operate by following the instructions provided here 4 1 ADJUSTMENTS AND CONTROLS The MK IV 3 Diver Intercom has various controls that allow you to customize and adjust the settings to your preference to provide optimal communications for your situation This section describes the available controls 4 1 1 SYSTEM POWER Once a power source is available Section 3 the power switch on the front panel Fig 2 11 toggles the unit s power on and off 4 4 DIVER CONTROLS 4 1 2 1 Diver Audio Volume Controls The microphone and earphone audio signal volume levels are separately adjustable for each diver Fig 2 1 and 4 so you can adjust the levels to provide the best combination for all divers and the tender to hear the communications comfortably 4 1 2 2 INAC Control The U S Navy first put the Inhalation Noise Attenuation Circuit INAC into use more than 20 years ago The purpose of this circuit was to reduce inhalation noise produced by preamplified microphones that tend to boost high frequency noise T
17. his noise is loudest in some but not all diving masks and helmets Depending on the microphone mask combination the INAC does attenuate diver inhalation noise However if the microphone mask and regulator produce low noise levels the INAC does not operate correctly because the INAC relies on noise levels that are much higher than that of divers speech A diver s speech will be cut off 1f inhalation noise levels are insufficient for the INAC to function correctly We therefore advise you to use the INAC only when warranted by inhalation noise levels otherwise the INAC controls should be set to the off position The INAC level control Fig 2 3 allows you to turn on and off the INAC circuit and to adjust the INAC detection sensitivity for each diver A higher sensitivity setting causes the INAC to turn off the diver s microphone more readily when in halation is detected Adjust the sensitivity for each diver such that speech is heard but inhalation breathing noise is not A red LED Fig 2 2 is provided for each diver s INAC control it illuminates to indicate that the INAC is active reducing noise 4 1 2 3 Microphone Type Selection The MK IV accommodates both powered 16 a MK IV PANEL BATTERY PANEL y s o o PX POWER CONTROL BOARD PANEL BOARD MIC SELECT SWITCH Figure 5 Location of Microphone Type Selection Switch preampli
18. ics are attached to the panel so it is fairly heavy and requires special care when being handled Lay the panel upside down with the panel controls facing downward 5 Find the toggle switch for selecting the type of diver microphone As illustrated in Figure 5 it is located on the left edge of the lower printed circuit board The two switch positions are labeled PWR and DYN 6 Set the switch at the appropriate position for the type of microphone the divers will use either PWR for powered pre amplified microphones or DYN meaning dynamic for standard non powered microphones Note All divers must use the same type of microphone powered or standard 7 Reinstall the MK IV panel being careful not to contact the thermal breaker Fig 3 7 and GFCI 6 switches against the flange of the case doing so might trip the switches Note The proper setting for both switches is to ON indicated on the GFCI switch as the 1 showing instead of the 0 and the adjacent indicator C10 colored red instead of green 8 Secure with moderate tightness the panel to the case with the fourteen screws and seals 9 Reconnect all devices to the front panel as well as the external power source if used see Section 4 2 for setup instructions 4 1 2 4 Diver PTT Control Most diver earphone microphone assemblies have a push to talk PTT button that for many communication systems has to be pressed for the diver to transmit
19. ify that one of the battery level indicator LEDs Fig 2 13 illuminates the green LED should illuminate in the presence of a battery or external DC power source of at least 10 volts If an AC power source is used the red charge indicator LED Fig 2 9 will also illuminate Sounds from all divers microphones connected to the MK IV can be heard Final adjustments Before and during the dive slowly adjust all volume levels as necessary to obtain the desired communication volumes If interference from diver breathing noise is a problem set the INAC level Section 4 1 2 2 to the minimal sensitivity necessary to stop the interference while still allowing the divers communications to be heard RECEPTION Once the MK IV 3 Diver Intercom is powered up it communicates all sounds detected by the diver microphones If necessary use the INAC sensitivity controls to screen out diver inhalation breathing noise from each diver Section 4 1 2 2 Adjust all audio volumes to comfortable listening levels The receive volume level of the tender headset is controlled by adjustments to the diver mouth volume levels it does not have its own independent control 4 4 TRANSMISSION 21 The tender should adjust the headset s boom microphone or hold the hand held microphone so that it is close to his mouth within 1 4 inch is best To transmit voice communications the tender should speak slowly clearly and directly into the microphone Becaus
20. in this event you will have to replace the battery Replacement RB 1 batteries part no 910319 000 are available from OTS or your local OTS dealer Follow these instructions to replace the RB 1 battery 1 Ensure the power switch Fig 2 11 is toggled to the off position If the unit is connected to an external power source unplug the power cable from it 2 Disconnect all devices attached to the front panel 3 Using a 2 Phillips screwdriver remove and set aside the fourteen panel screws Fig 2 21 and neoprene seals 4 Using the two handles Fig 2 14 remove the front panel The MK IV s internal hardware and electronics are attached to the panel so it is fairly heavy and requires special care when being handled 5 Disconnect the battery leads on opposite ends of the battery Fig 3 3 using a slotted screwdriver IMPORTANT NOTE Always disconnect the negative black lead first to prevent accidental short circuiting 6 Remove and set aside the four screws Fig 3 1 and lock nuts 5 that secure the battery 2 to the battery tabs 4 7 Lift or slide out the battery from the tabs 8 Replace the battery with the new one installing it with the terminals down and with the top of the battery with the label facing away from the electronics on the battery plate The and signs should be oriented as illustrated in Figure 3 9 Replace the four screws and lock nuts Tighten them securely without over 12
21. indicator LED Section 3 1 1 and Table 2 If the battery 1s not sufficiently charged recharge it per the instructions in Section 3 1 1 3 Diver microphone type selection Follow the instructions in Section 4 1 2 3 to select the type of microphone the divers will be using 4 Test of GFCI electrical safety mechanism If you are going to use the MK IV with AC power we recommend you test the GFCI according to the instructions in Section 3 2 1 1 GFCI IMPORTANT NOTE This step must be done in a dry environment with no sea spray or standing water around and should be done only by a qualified test technician due to the safety risk associated with having the panel assembly open while AC power is supplied to the unit 19 Table 3 Connectors and Wiring of External Devices Item 1 Connection Diver umbilicals Connector OTS P N Connector Industry P N Pin Signal 211218 000 MS3116E14 5P mUOU Mic ground Mic signal Ear signal Ear signal Chassis ground Tender headset J070 5 MS3116E10 98P wga Tender mic signal Tender mic return Tender ear signal Tender ear return Chassis ground No connection AC charger J070 MS3116E10 6S Huma AC hot Neutral Chassis ground No connection No connection No connection External speaker 211106 000 MS3116F8 4S Source Ground No connection No connection Record out 211106 000 MS3116F8 4S No connecti
22. iver earphone microphone assemblies TENDER MOUTH VOLUME This knob controls the output audio volume from the microphone on the tender headset or optional HHM MKIV hand held microphone sold separately The setting affects the audio heard by all divers HEADSET This six contact military style MS receptacle accepts the con nector from the supplied THB 16 tender headset or the optional HHM MKIV hand held microphone sold separately MIC POWER This LED illuminates red to indicate when the microphone type selection switch see Section 4 1 2 3 and Fig 4 is set to the power mic position so that power is supplied to the microphone CHARGE indicator When AC power is supplied Item 9 this LED indica tor illuminates red or green to indicate the charging status of the battery see Section 3 1 1 AC CHARGER power four pin military style MS connector for provid ing external AC power to charge the battery Section 3 1 1 or to operate the unit using AC power Section 3 2 POWER switch A two position toggle switch for turning on and off the MK IV power 12 VOLT DC POWER A receptacle that accepts a double banana plug from a 12 volt DC power source as an alternate to the internal battery or an AC power source BATTERY LEVEL Three LEDs that illuminate to indicate the battery volt age level as explained in Section 3 1 Handle 1 of 2 Handles for lifting either the MK IV unit with the case open or the panel out of the case
23. knobs on the front panel are all military style and are therefore constructed to a high quality standard providing ruggedness and durabil ity for use in marine and other harsh environments The panel speaker meets military standard MIL L 24296A and is built for durability and endurance under demanding environmental conditions Its resistance to shock vibration and salt spray make it an excellent speaker for oceanic shipboard use 2 2 INCLUDED WITH THE MK IV The following items are provided with the MK IV THB 16 tender headset with boom microphone part no 900298 032 AC power charging cable part no 91408 1 000 Two 2 four socket military style MS connectors OTS part no 211106 000 industry part no MS3116F8 4S MK IV 3 Diver Intercom user s manual document no 506118 000 Warranty card with the MK IV unit s serial number doc no 506014 000 2 3 ADDITIONAL COMPONENTS SOLD SEPARATELY 2 3 1 COMMUNICATION CABLES Each diver requires an intercom cable for connection from his earphone and microphone to the MK IV Be sure to obtain the 5 pin military style plug on one end that matches the diver umbilical receptacles Section 2 4 Item 5 on the MK IV refer to Table 3 Item 1 in Section 4 2 The other end of the cable should have the connector for your particular earphone microphone assembly 2 3 1 1 ComRopes OTS offers ComRopes consisting of communication cables bundled inside a durable yet flexible rope Various
24. l Breaker The thermal circuit breaker Fig 3 7 monitors the amount of AC current passing through the circuit Ifthe internal power supply Fig 4 6 were to fail allowing excessive current to pass through then the thermal breaker would trip deactivating AC power to the unit If the thermal breaker trips it must be reset before the MK IV can be used again with AC power To do so the panel assembly must be removed follow steps 1 4 of Section 3 1 2 IMPORTANT NOTE Because of the possibility of electrical shock when the panel is opened the thermal breaker should be accessed only by a qualified technician furthermore the MK IV must be in a dry environment and on a stable surface Refer to Figure 3 Item 7 for the location of the thermal breaker When the thermal breaker trips the unit s power is immediately deactivated as indicated by the charging indicator LED s Fig 2 9 turning off The unit s power cannot be reactivated from an AC source until the thermal breaker is reset although power can still be obtained from batteries or an external DC source 3 3 EXTERNAL DC POWER To operate the MK IV using an external 12 volt DC power source such as a lead acid battery of 5 0 Ah or other DC power supply connect electrical cables via a standard double banana plug to the DC power receptacle Fig 2 10 on the MK IV front panel Be sure to connect the negative lead to the black socket and the positive to the red Ifthe volta
25. lengths of ComRopes are avail able with connectors to match different earphone microphone assemblies Contact OTS or your local OTS dealer for information about available ComRopes for use with the MK IV 2 3 1 2 Spiral Four This cable has been used extensively with military and commercial divers for many years It has been available as military surplus but is becoming harder to find However there are some cable manufacturers that have duplicated this cable and it is now available to the diving community The most important feature of this cable is the internal wires used for microphone and earphone circuits Usually there are two white and two brown or black cables configured in a twisted pattern Always connect the speaker or microphone to either the white pair or the black brown pair If this is not done electrical feedback squeal will occur When connected correctly the cable is balanced and clear communication is possible A Non powered dynamic mic ME B Non powered dynamic mic 16R Hot Mic for Interspiro Shure microphone for band FFM mask or SuperLite helmet C Powered preamplified micro D Powered preamplified micro phone for Interspiro FFM phone for band mask or Super Lite helmet Figure 1 Examples of Standard and Preamplified Microphones 2 3 1 3 Shielded Cable Another available cable contains at least one twisted shielded balanced cable and
26. lled into the Mantis FFM It consists of two earphones two earphone holders a Hot Mic a Hi Use connector and a PTT button 2 3 3 18 EMMT 2SM 911060 103 The EMMT 2SM EM assembly is designed to be installed into the Mantis FFM It consists of two earphones two earphone holders a Super Mic a Hi Use connector and a PTT button 2 3 4 HHM MKIV HAND HELD MICROPHONE As an alternative to the THB 16 headset a hand held microphone the HHM MKIV is available It should be used if the tender prefers to use the panel speaker instead of the head set s earphone to listen to received communications Unlike use of the THB 16 headset the PTT button on the HHM MKIV must be pressed in order to transmit This feature is useful if the tender does not want to transmit constantly 2 3 5 UMBILICAL ADAPTERS OTS offers adapters to interface to your current umbilical communications cables OTS offers a 6 pin to 5 pin p n 914085 000 military style adapter for use with Hydrocomm cables Another available adapter is a double banana to 5 pin p n 914085 001 military connector for use with communication cables having standard double banana plug connectors 8 2 4 FUNCTIONS Figure 2 depicts the MK IV panel with its controls and connections The numbered text below is the key to the indexed items in Figure 2 Boldfaced text in all capital letters refers to the label on the panel 1 DIVER MOUTH VOLUME 1 of 3 Volume control knob for listening to di
27. mpted by other than an Ocean Technology Systems factory trained service center or properly trained personnel In no event shall Ocean Technology Systems be liable for consequential damages Undersea Systems International Inc dba Ocean Technology Systems 3133 West Harvard Street Santa Ana CA 92704 USA Toll free 800 550 1984 Telephone 714 754 7848 Fax 714 966 1639 E mail ots otscomm com Web www otscomm com You can now register your product online at the OTS Web site Just visit http www otscomm com register html O Copyright 2010 by Undersea Systems International Inc dba Ocean Technology Systems All rights reserved
28. nd listen simultaneously without the need for a push to talk system that would interrupt communications The MK IV 3 Diver Intercom represents the latest generation of intercom technol ogy with many useful features for outstanding performance including an INAC Inhalation Noise Attenuation Circuit for reduction of diver inhalation noise a MIL spec speaker designed for high quality sound MIL spec connectors for all communication connections capability of both powered preamplified and non powered microphones remote speaker and record out connections GFCI and transformer isolation for enhanced diver safety a durable heavy duty housing and much more In all the MK IV 3 Diver Intercom is second to none 1 1 GENERAL This manual contains much of the information you will need to know regarding the Aquacom MK IV 3 Diver Intercom communication system Section contains a table of specifications and an overview of the functions of the MK IV Before operating the MK IV 3 Diver Intercom read this entire manual In addition to the information presented on functions and operation there are some important safety issues all users must be familiar with before using the MK IV If you have any questions contact your local OTS dealer or feel free to contact OTS directly see page 28 for OTS contact information 1 2 SPECIFICATIONS Input voltage Input current Idle current Audio power Frequency response Microphone input impedanc
29. ng Every 15 sec 6 5 V 1 These values are approximate and should be used only as an estimate 11 failure or defective battery cell gasses released during charging can thus dis sipate out of the unit through the vent the released gasses are lighter than air and travel upward Allow at least 20 minutes after charging for any gasses to dissipate before returning the unit to its operating position and closing the ventilation valve by rotation fully clockwise to prevent water entry 2 Because the ventilation port should be open while AC power is used and the battery recharges the MK IV should be operated in such a way as to minimize contact with splashing or spraying water Operation away from direct contact with salt water or freshwater splashes or sprays is always recommended when operating 110 220 volt mains powered electronics A fully depleted battery can be recharged completely in about 3 5 hours While the battery is being charged and its voltage is below maximum the charge indicator LED Fig 2 9 illuminates red in color When the battery has been com pletely recharged the charger will enter trickle charge mode to maintain maximal battery voltage indicated by green illumination of the charge indicator LED 3 1 2 BATTERY REPLACEMENT The RB 1 battery should provide a long lifetime of service through many depletion and recharging cycles Nevertheless eventually the battery may cease maintaining an adequate charge
30. nology pro viding a long service life high cycle life superior reliability even under extreme conditions and use and relative safety minimal or no gassing under normal charg ing conditions The RB 1 is recognized by Underwriters Laboratories UL as a component and meets UL1989 Use the battery level indicator LEDs Fig 2 13 to monitor the voltage level ofthe internal battery The battery s charge status is indicated by the LEDs and beep tone sounds as described in Table 2 When the battery charge drops to approximately 6 volts the MK IV s power will shut off Refer to Section 3 1 1 for information on recharging the battery 3 1 1 BATTERY CHARGING The MK IV is equipped with an internal bat tery charger so one only has to connect the MK IV to an AC power source per the instructions in Section 3 2 to recharge the battery Safety Precautions 1 While charging the battery it is very important to open the MK IV s lower safety vent located on the front of the case s lower half when the panel faces upward by unscrewing the ventilation valve fully counterclockwise Ideally while the batteries recharge the MK IV should be rotated 90 degrees onto the back of the case such that the valve is facing up in the event of a charger Table 2 Battery Voltage Indication LED Color LED Status Beep Tone Voltage Green Solid None Above 9 V Yellow Solid None 9v Red Solid Every 30 sec 8 V Red Blinking Every 30 sec 7V Red Blinki
31. on No connection Source Ground HSU J070 4 MS3116E10 6P 7AMOUQADPS gawr DADS Signal in out Ground Signal in out Control Voltage 1 12 V Voltage 2 5 V 20 10 11 4 3 Diver connections With the MK IV power switch still in the off position plug the communication cable e g ComRope from each diver into the diver umbilical connector on the panel Fig 2 5 With multiple divers note which diver is designated as Diver 1 Diver 2 etc Tender connection Plug the headset or hand held microphone connector into the headset jack Fig 2 7 Auxiliary connections If you are going to use a recording device a remote speaker or a helium speech unscrambler HSU connect the device to the appropriate jack on the panel Fig 2 15 16 and 17 Power connection If an AC power source will be used to operate the MK IV follow the instructions in Section 3 2 Ifa DC source is to be used follow the instructions in Section 3 3 Initial adjustments Turn all volume controls diver mouth diver ear tender mouth and external speaker to a minimal setting Doing so will prevent ear damage in case the settings were previously too high Turn off or to a minimal setting the INAC for each diver Power activation Before activating the unit s power ensure the lower ven tilation valve on the front of the case is completely closed rotated fully clockwise Turn on the system power Section 4 1 1 Ver
32. or not making contact Open circuit on board GFCI switch defective or tripped Thermal breaker switch defective or tripped Recharge battery Check battery connections Change switch Clean pins Repair or replace board Check GFCI switch 1 should show instead of 0 C10 indicator red instead of green Check thermal breaker switch Should be set to ON Battery does not charge charge indicator LED does not illuminate Damaged power cord GFCI switch defective or tripped Thermal breaker switch defective or tripped Check power cord Check GFCI switch 1 should show instead of 0 C10 indicator red instead of green Check thermal breaker switch Should be set to ON Battery does not hold a charge Defective battery Replace battery Power only for a short time when power switch is turned on Defective boot circuit or CPU chip Replace board Does not operate on external DC power Incorrect polarity or insufficient voltage Check voltage and polarity of DC power source Does not operate on AC power Defective AC power outlet cont Check AC power source See Section 3 2 1 Electrical Safety Mechanisms for information and instructions 25 Table 4 continued Problem Probable Cause Remedy Damaged power cord GFCI switch defective or tripped Thermal breaker switch defective or tri
33. our messages to ensure they understood what you said Also repeat what you heard the divers say to ensure everyone is communicating accurately If this is the first time you or anyone on your team is using underwater com munications the team should get together to talk about the system Practice alternative communications to allow for the event the communications system fails to function 23 SECTION 5 MAINTENANCE AND TROUBLESHOOTING 5 1 PREVENTIVE MAINTENANCE Although the Aquacom MK IV 3 Diver Intercom has a rugged design it should be treated with care as with any quality electronic equipment The following should be done regularly or before every dive to prevent malfunction of the MK IV 1 Clean the MK IV by wiping it free of dirt debris and water with a clean soft cloth Warm water with a small amount of nonabrasive soap is the recommended cleaning solution Do not saturate the cloth or sponge doing so may allow water to flow inside the case and cause damage To clean the headset or optional hand held microphone use a mild soap solu tion and wipe it dry Examine the exterior of the MK IV to assure there is no damage Inspect the connectors and controls on the panel for signs of damage Check the connectors for bent or corroded pins Check the power cables for cuts and abrasions With the unit s power on test the indicator LEDs to ensure they illuminate when they should 7 Inspect the case gasket underne
34. power When the GFCI trips the unit s power is immediately deactivated as indicated by the charging indicator LED s Fig 2 9 turning off Also the GFCI switch Fig 4 4 moves to the off position the power indicator LED Fig 4 2 turns off although this can be difficult to determine because its illumination 1s very dim and the GFCI status window shows a green color The unit s power cannot be reactivated from an AC source until the GFCI is reset although power can still be obtained from batteries or an external DC source Key 1 GFCI test button 4 GFCI toggle switch 2 GFCI power indicator 5 Thermal breaker toggle switch 3 GFCI status indicator 6 Charger power supply Figure 4 Electrical Safety Mechanisms 14 If AC power will be used It is a good idea to test the GFCI before each use of the MK IV to verify that the fail safe mechanism works for assurance of diver safety As explained previously this test must be done away from water to prevent risk of electric shock with the unit s panel opened and it should be done only by a quali fied technician To test the GFCI press the test button Fig 4 Item 1 on the GFCI case The power should immediately deactivate If it does not contact OTS for assistance Do not use the MK IV until this problem is solved MPORTANT Be sure to move the GFCI switch back to the on position or the unit s power will not activate 3 2 1 2 Therma
35. pped Check power cord Check GFCI switch Check thermal breaker switch No diver voice Microphone type incompatibility Poor diver and or tender headset connections If problem only with tender defective or damaged headset Loose diver connection at processor board Defective PCB Defective volume control Defective panel speaker Check for correct dyn power mic selection for type of microphones Ensure all mics are of the same type Check diver and tender headset connections Check headset cable and connector Check diver connector clean or reconnect Replace board Replace control Replace speaker No tender voice Poor tender headset connection Loose tender connection at processor board Check tender headset connection Check tender connector clean or reconnect Defective board Replace board Weak battery Recharge the battery No record out function Board connector not Clean pins or replace making contact defective connector See Section 3 2 1 Electrical Safety Mechanisms for information and instructions 26 APPENDIX SPARE COMPONENTS AND PARTS Part Description OTS P N U S Military P N Figure Item 1 THB 16 tender headset 900298 032 N A N A with boom microphone 2 AC power charging cable 914081 000 N A N A 3 RB 1 battery 910319 000 N A 32 4 Panel screw 244004 000 N A 2 21 5 Panel sealing washer 245051 001 N A N A 6 Panel handle
36. rding Communications 22 46 Aliterthe Dive ione donee ee tee PRO RECRS 22 4 Helpful Hints cerner in i o rem ore o E 22 Section 5 Maintenance and Troubleshooting ss 24 5 1 Prey ntive Maintenance uiia e REED 24 5 2 Troubleshooting ttr tereti 24 Appendix Spare Components and Parts eese 27 Limited Warranty e ensoeeniiee ee et ees 28 Tables Table 1 Compatible EM Assemblies with Standard Microphones 7 Table 2 Battery Voltage Indication sess 11 Table 3 Connectors and Wiring of External Devices 20 Table 4 Troubleshooting 1 c n nisi es 25 26 Illustrations Figure 1 Examples of Standard and Preamplified Microphones 4 Figure 2 MK IV Panel Layout etie eere 9 Figure 3 Battery Panel Assembly sssssssseeeee 13 Figure 4 Electrical Safety Mechanisms eee 14 Figure 5 Location of Microphone Type Selection Switch 17 iii SECTION 1 INTRODUCTION Congratulations You have just purchased one of the finest state of the art under water communication systems available The Aquacom MK IV 3 Diver Intercom allows open round robin communications through intercom lines among a surface tender with a headset included and up to three divers with earphone microphone assemblies sold separately All users can speak a
37. s 243007 000 N A 2 14 7 Panel connectors a Diver umbilical connectors 211217 000 MS3112E14 5S 2 5 b Tender headset connector J070 1 MS3114E10 98S 2 7 c AC charger power connector J070 2 MS3114E10 6P 2 10 d 12 volt DC power connectors Red 211136 000 N A 2 12 Black 211136 001 N A 2 12 Record out amp aux speaker 211105 001 MS3114E84P 2 15 16 connectors f HSU J070 3 MS3114E10 6S 2 17 8 Panel speaker 110052 000 N A 2 19 9 Control knobs pointed 242018 000 MS91528 2 1 3 4 6 18 10 Bumper feet 24806 1 000 N A N A 11 LED lens caps a Red H016 N A 2 13 b Yellow H016 3 N A 2 13 c Green H016 2 N A 2713 d Clear 248060 000 N A 2 8 12 Case housing 134145 000 N A N A 13 Case gasket 282032 000 N A N A 14 Case lid o ring 282033 000 N A N A 27 Undersea Systems International Inc dba Ocean Technology Systems LIMITED WARRANTY Ocean Technology Systems Aquacom MK IV 3 Diver Intercom is fully warranted against defects in materials and workmanship for a period of one year from the time of purchase Our obligation under this warranty is limited to the replacement of any part or parts that prove to our satisfaction to have been defective and that have not been misused or carelessly handled Labor is warranted for one year from time of purchase The complete unit and or part must be returned to our factory transportation charges prepaid We reserve the right to decline responsibility where repairs have been made or atte
38. to the M 48 SuperMask FFM It consists of two earphones earphone holders a Hot Mic a Hi Use connector and a PTT button 2 3 3 11 EMD 2SM 911060 101 The EMD 2SM EM assembly is designed to be installed into the M 48 SuperMask FFM It consists of two earphones earphone holders a Super Mic a Hi Use connector and a PTT button 2 3 3 12 EMDG 2 911060 076 The EMDG 2 EM assembly is designed to be installed into the Drager Panorama Nova Dive Mask It consists of two earphones earphone holders an ME 500 microphone a Hi Use connector and a PTT but ton 2 3 3 13 EMHI 1 900332 000 The EMH MAG2 EM assembly is designed to be installed into the HM 1 silicone half mask It consists of one earphone a Hot Mic a Hi Use connector and a PTT button 2 3 3 14 EMHI 1SM 900332 001 The EMH MAG2SM EM assembly is de signed to be installed into the HM 1 silicone half mask It consists of one earphone a Super Mic a Hi Use connector and a PTT button 2 3 3 15 EMMT 1 911060 090 The EMMT 1 EM assembly is designed to be installed into the Mantis FFM It consists of one earphone an earphone holder a Hot Mic a Hi Use connector and a PTT button 2 3 3 16 EMMT 1SM 911060 102 The EMMT 1SM EM assembly is designed to be installed into the Mantis FFM It consists of one earphone an earphone holder a Super Mic a Hi Use connector and a PTT button 2 3 3 17 EMMT 2 911060 091 The EMMT 2 EM assembly is designed to be insta
39. urpose Seller s and Manufacturer s only obligation shall be to replace such quantity of the product proved to be defective Before using the user shall determine the suitability of the product for intended use and the user assumes all risk and liability whatsoever in connection therewith Neither Seller nor Manufacturer shall be liable either in tort or in contract for any loss or damage direct incidental or consequential arising from the use of or the inability to use the product No statement or recommenda tion not contained herein shall have any force or effect unless it is in an agreement signed by officers of the Seller and Manufacturer IMPORTANT SAFETY NOTICE Please read before using product It is absolutely essential that all operators are properly trained and equipped and fully understand this user s manual before attempting to use the MK IV 3 Diver Intercom While the MK IV provides good underwater communications it does not change or eliminate the potential hazards of diving Refer to the Library page of our Web site www otscomm com for a list of any changes made to this manual since its publication Copyright 2010 by Undersea Systems International Inc dba Ocean Technology Systems All rights reserved Specifications are subject to change without prior notice 506118 000 J i Section 1 1 1 1 2 Section 2 2 1 2 2 2 3 2 4 Section 3 3 1 TABLE OF CONTENTS Introduction
40. ut if one were to take off the FFM at 30 feet and drop down to 40 feet the pressure difference may damage the microphone 2 3 2 Super Mic Depth Master The Super Mic offers patented technol ogy that overcomes a limitation of other microphones It can be used at any depth and unlike the Hot Mic or many other microphones can withstand changes in depth while submerged so it will not be damaged if the diver needs to descend with the mask flooded such as when a full face mask is removed and stowed when the diver changes to another air system It is a ceramic microphone with a compact lightweight design and noise cancelling properties reducing background noises for clearer communications When only the highest quality of intelligibility is required the Hot Mic is the preferred choice but the Super Mic s intelligibility is sufficient for most diving situations To assure clear communications when using the Super Mic it should be no more than 1 4 inch from the corner of the diver s mouth After each dive clean the Super Mic by rinsing it with freshwater and drying it with a clean soft towel No other maintenance is required U S Patent no 7 170 822 EU patent nos 000458351 0001 0002 0003 0004 0005 0006 5 Note Do not press on the microphone diaphragm doing so may cause damage 2 3 2 3 Powered Preamplified Microphones The MK IV supports the use of preamplified microphones Fig 1C amp D which tend to be more
41. ver speech Separate volume controls are provided for the three diver connections Rotate the knob clockwise to increase and counterclockwise to decrease the volume NAC indicator 1 of 3 This red LED indicator illuminates to indicate when he INAC function is active reducing noise levels One indicator is provided or each diver NAC LEVEL 1 of 3 This knob controls the INAC sensitivity A separate NAC control is provided for each diver A clockwise rotation increases the ensitivity to shut off the diver transmission more readily in response to diver nhalation noise A full counterclockwise turn past the detent shuts off the NAC 4 DIVER EAR VOLUME 1 of 3 A knob is provided for adjustment of the receive volume for each diver earphone Clockwise rotation increases and UJ N p i e p m2 v Q AQUACOM CoE 5 gt MK IV Om 3 DIVER INTERCOM A J DIVER 1 DIVER 2 DIVER 3 D E om o nd nd me Ea _O ete e tex e te 3 vla gt o e Pou koru UMBILICAL UMBILICAL g 49 a Figure 2 MK IV Panel Layout 9 10 11 12 13 14 I5 16 17 18 19 20 2 counterclockwise rotation decreases the volume UMBILICAL 1 of 3 The five socket military style MS receptacles for connecting the cables from the d
42. voice communications However because the MK IV is a four wire round robin system the diver microphone is constantly in transmission mode so the PTT button is not used 4 1 3 TENDER CONTROL Control of tender communications is simple with one tender control the tender mouth volume control knob Fig 2 6 It is used to adjust the audio volume output by the tender microphone on the supplied headset or optional HHM MKIV hand held microphone sold separately Adjust the tender mouth volume level in coordination with the diver earphone volume levels Section 4 1 2 1 to provide the optimal listening volume for each diver A fully counterclockwise turn ofthe tender volume control past the detent deactivates the tender microphone so no tender speech will be heard The tender headset listening volume is controlled via the diver microphone vol ume controls Section 4 1 2 1 there is no separate audio volume control for the headset earphones The THB 16 tender headset has a push to talk PTT button below the earcup 18 however because the MK IV is a four wire system with constant intercom com munications the headset s PTT button is not used If you use the optional HHM MKIV hand held microphone sold separately press and hold down the PTT button on the microphone while speaking 4 1 4 SPEAKER POWER AND VOLUME The speaker volume control knob Fig 2 18 adjusts the audio volume output from both the panel speaker 19 and an
43. y external speaker connected to the auxiliary speaker jack 16 If the tender prefers to listen only through the headset the speaker on off switch 20 should be turned to the off position If a remote speaker is used it operates independently of the on off switch 20 and is still affected by the volume control knob 4 2 SETUP To prepare the MK IV 3 Diver Intercom for use follow these simple instruc tions 1 Electrical connector wiring If you plan to use system components or acces sories not manufactured by OTS or not designed to be compatible specifically with the MK IV you will need to acquire the correct connectors and install them onto the cable or wiring harness of your equipment Refer to Table 3 for a list of compatible connectors and for information for the wiring hookup for each device Provided with the MK IV are two 4 contact military style MS receptacles for connection of a recording device and an external speaker The two connectors are identical If you are going to record communications or use an external speaker make the wiring connections depicted in Table 3 1tems 4 and 5 from the device s cable to the supplied MS connector 2 Battery charge If the internal battery is going to be used for powering the unit ensure the battery is adequately charged by checking the battery level indicator LEDs Section 3 1 or if a completely full charge is needed by connecting AC power and observing the color of the charge
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