Ocean Technology Systems 900473-000 User Manual Download Page 25

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WATER TEMPERATURE

Variations in water temperature affects sound transmission most. In some 

areas of the ocean, the temperature changes at a fixed rate over large 

ranges of depth. If the temperature increases with depth, the velocity 

of sound increases and the sound waves will be refracted toward the 

surface. If, however, the temperature decreases with the depth, the 

velocity of sound decreases and the waves of sound are bent downward.

There are also areas in the sea where temperature changes rapidly over 

a small depth range called a thermocline. Thermoclines can to produce a 

sharp bending of sound waves and may serve as reflecting surfaces.

The velocity of sound transmission changes only about one percent for a 

temperature change of l0°F. However, the bending of the sound path has 

great effect over a distance of several hundred yards.

If the temperature of the water decreases with depth at the rate of 1°F 

for each 30 feet (starting at the surface), most of the sound energy 

originating at the source near the surface will travel along paths that are 

bent downward. Therefore, the sound energy may not reach a shallow 

detector positioned l,000 yards from the source but may reach a deeper 

detector position further from the source. Greater temperature variations 

can cause these paths to bend more sharply. The best method to deal 

with thermoclines is to bring the divers and/or transducers as close to 

each other as possible.

If a diver enters a thermocline, the diver should report it to everyone 

(surface and divers) so they know the depth of the thermocline. All 

divers should stay within that depth, and the surface station should try to 

position the surface transducer below or above, whichever is the case.

WATER DENSITY

Water density is important for the propagation of the sound. Because 

the density of sea water varies with temperature, salt content, and static 

pressure, the effect on sound of each of these three factors is usually 

considered separately.

BACKGROUND NOISE

Marine organisms play an important role in underwater acoustics.  

They are important primarily because of the effect they have on sound 

transmission, but they often serve as sources of underwater noise as 

well. High background noise can interfere with good communications.  

Such background noise can be mitigated with the squelch function. 

Summary of Contents for 900473-000

Page 1: ...User Manual...

Page 2: ...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...

Page 3: ...d the manual before charging Battery contains a protection circuit to prevent damage to the battery during use Care must be taken to ensure the battery is not damaged If the battery will not take a ch...

Page 4: ...al batteries in the same location ensure the battery contacts are protected from coming into contact with another battery Do not use this battery for other application If the battery is completely dra...

Page 5: ...ot disassemble or reconstruct the battery Do not throw drop or cause impact to the battery Do not pierce a hole or puncture the battery with sharp objects Do not use any other batteries or cells in th...

Page 6: ...v OTS MILCOM...

Page 7: ...lume 10 Squelch 10 Scrambler 10 Battery Charging 11 Low Battery Indicator 11 Battery Disposal 11 Maintenance 11 PRE DIVE PROCEDURE FOR ESTABLISHING COMMUNICATIONS 11 POST DIVE 12 Troubleshooting Guide...

Page 8: ...ume adjustments and our newest feature scrambler mode for more secure communications We ve also increased the modularity of the system that allows for ease of servicing options for cable lengths and c...

Page 9: ...tion Push To Talk PTT Transmitter Band MilCom 6000D 25 33 kHz 2 channel Battery Type Rechargeable Lithium Ion Battery Housing Injection molded polycarbonate Maximum Depth 300 ft 91 4 m Housing Dimensi...

Page 10: ...hone Microphone Connector Main Housing Belt Clip 137084 000 Housing O ring 283058 000 Rubber Armored Base O ring 283059 000 Microprocessor controlled Smart Battery 910505 000 Rubber Armored Base 13306...

Page 11: ...MAIN HOUSING The main housing of the unit contains the electronics and battery compartment of the system The connectors to the Transducer and the Earphone Microphone cables are user replaceable The B...

Page 12: ...dive EARPHONE MICROPHONE ASSEMBLIES Earphone Microphone Assemblies are available for most popular full face masks on the market Part Number Description 910496 000 OTS Guardian FFM Hot Mic Dual Earphon...

Page 13: ...or breakage When the Battery Charger is connected to the unit the LED on the Battery Charger will turn GREEN then switch to RED if the battery requires a charge If not the LED will remain GREEN to in...

Page 14: ...elect an option press the PTT button once when you hear the setting you want to change This will prompt a sub menu that will read additional choices A table of the complete menu is provided Depress th...

Page 15: ...9 OTS MILCOM Main Menu Sub Menu Channel A B Receive Low Medium High Extra High Scrambler On Off Settings indicated in Yellow are the factory default settings...

Page 16: ...lot of noises in the spectrum used for Wireless Communications Marine biological noise especially shrimp can be considerable and sounds like static Mechanical noise can come from numerous sources such...

Page 17: ...the unit shuts down due to low battery level BATTERY DISPOSAL Dispose of the Lithium Ion battery and the Battery Charger in accordance with the local state and federal electronic waste recycling regul...

Page 18: ...ere it is mounted POST DIVE PROCEDURE 1 Rinse the unit in freshwater for several mintues or until the unit is clean A mild soap solution may be used to remove contaminants and after cleansing rinse wi...

Page 19: ...ntact OTS Transmission setting stuck on PTT Contact OTS No Side Volume Contact OTS Charger LED illuminates green but the unit LED does not activate Contact OTS Charger LED illuminates green unit LED i...

Page 20: ...ling Screw O rings 2 years Battery Base and Housing O rings 2 years Cable As Required Transducer As Required Note If the unit is opened for any reason be sure to inspect the O rings for any damage or...

Page 21: ...us at SALES OTSCOMM COM or 714 754 7848 BATTERY REPLACEMENT 1 Using a large flat head screw driver loosen the screws on the bottom of the unit as shown Rotate the screws counter clockwise until the sc...

Page 22: ...crew O rings there is a second set of threads in the Rubber Armored Base continue to unscrew by pulling lightly on the Sealing Screw while unscrewing counter clockwise The Sealing Screw will extract e...

Page 23: ...hten the screws Do not over torque the screws SPARE PART ORDERING INSTRUCTIONS Spare parts are available to purchase from OTS To Purchase contact OTS at SALES OTSCOMM COM Part Number Part Description...

Page 24: ...r communication DISTANCE The sound intensity from a source varies inversely with the distance from the source As the sound passes through the water some of the energy is converted to heat and some ene...

Page 25: ...t are bent downward Therefore the sound energy may not reach a shallow detector positioned l 000 yards from the source but may reach a deeper detector position further from the source Greater temperat...

Page 26: ...he backside of the blocking object a zone of silence is formed in which reception of the transmitted signal is not possible Divers can reduce zones of silence by moving away from around or above the b...

Page 27: ...21 OTS MILCOM Notes...

Page 28: ...tory trained center or properly trained personnel In no event shall OTS be liable for consequential damages related to our product s Warranty registration is required Any parts requiring replacement d...

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