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The GSM Mercury uses a dynamic microphone, ”

D-Mic II

” encapsulated  and 

protected by a hydrophobic membrane.
It is very similar to the 

D-Mic

but in a different housing allowing a much easier 

handling and use of it.

The microphone allows dependable clear reproduction of the human voice.  It 
removes unnecessary noise such as the noise of bubbles being exhaled from the 
mask.

The 

D-Mic II

microphone uses a hydrophobic membrane that allows air to pass 

through while protecting the microphone from water. This membrane also 
reduces the “muffling” effect allowing a phonic performance that is very high. 
Another characteristic of the hydrophobic membrane is its mechanical strength.  
The 

D-Mic II

, is fitted with a membrane that is designed to handle pressure of 

more than 1bar (14.7 PSI). If the membrane brakes, the microphone will flood 
causing transmission to stop. OCEAN REEF IDMs masks are designed to operate 
with “balanced” pressure. If the mask is removed underwater the microphone 
WILL NOT suffer any damage. However, continuing to descend WITHOUT the 
mask sealed on the face the microphone may result in exceeding the 1 bar 
mecahnical resistance of the membrane, resulting in damaging permantly the 
microphone (in relation to the depth at which the mask was removed). 
Ascending must be done in accordance with the dive tables or dive computer to 
avoid decompression problems. The communicator and microphone should be 
rinsed with fresh water (immersed, high pressure water is not reccomended as it
can damage components) after each dive and should be placed in a well 
ventilated area that is not exposed to direct sunlight to dry.

D-Mic II

does not have a polarity restriction when assembled on the PTT 

contacts. Be careful to unscrew the two screws before removing it.
Clean the contacts and lubricate them on a timely base.

Microphone

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Summary of Contents for GSM Mercury

Page 1: ...underwater naturally by INSTRUCTION MANUAL...

Page 2: ......

Page 3: ...MIC Functioning Scheme Antenna Battery compartment Mounting the GSM Mercury on the Extender Frame Microphone Replacing the New D Mic Replacing the Battery Checking before use Basic Instructions for u...

Page 4: ...hing else than fresh water and the compartments opened unscrewed DO NOT apply any type of aerosol spray on the GSM Mercury communication unit Doing so may cause permanent damage to certain components...

Page 5: ...s with volume adjustment new PTT MIC assembly for a more ergonomic use two channels D A T mode handsfree mode rechargeable replaceable battery micro USB cable for charging the battery the unit is fold...

Page 6: ...The new GSM DC2 consists of three main parts 1 PTT MIC 3...

Page 7: ...g a normal use it is activating the transmission mode when pressed and the receiving mode when released PTT When into the programming mode it is used to make the desired selection by pressing once qui...

Page 8: ...lume will rise to level 3 by pressing it again it will lower to level 1 etc Programming mode navigation by keeping it pressed 2 seconds the unit will enter the programming mode guided by voice program...

Page 9: ...ng phase until the diver pushes the PTT yellow button keeping it pressed the diver is able to communicate to other underwater or surface units activated on the same channel Releasing the PTT button wi...

Page 10: ...et contacts for the automatic turning on off of the unit on the sides there is the strap holder to keep the left strap in a streamline position after the adjustment of the mask and the new foldable su...

Page 11: ...hen connecting the micro usb cable to charge the battery a red LED will show battery under charge while a green LED will show battery fully charged The micro usb cable may be connected to a wall adapt...

Page 12: ...n the picture below Begin mounting the L antenna earphone of the Mercury Securing it to the Extender Frame exactly like a Neutral or an earphone support Bridges have L and R written on them for identi...

Page 13: ...f the mask by screwing it on The crown around the PTT will turn until flush Last connect the battery compartment to the right side of the Extender Frame by having the cable connecting the two ears pas...

Page 14: ...will flood causing transmission to stop OCEAN REEF IDMs masks are designed to operate with balanced pressure If the mask is removed underwater the microphone WILL NOT suffer any damage However contin...

Page 15: ...nd pull off the new D MIC Replace with the new one being careful not to overtight the little screws to avoid damages to the contacts Replacing the Battery The battery is replaceable by disconnecting t...

Page 16: ...the antenna of another active unit about 5 cm 2 inches keeping your fingers on the On Off contacts You should also be able to hear the communication when the unit is not immersed in water Pushing the...

Page 17: ...iving It is best to attract their attention before sending a message Talking and listening while underwater requires practice With experience divers will become more proficient in the use of the commu...

Page 18: ...you may experience difficulty communicating because 1 The surface is full of air bubbles formed by the waves 2 The sand under water is causing ultrasonic noise due to the waves For more information ht...

Page 19: ...near magnetic fields Do not allow it to fall or be knocked around Make sure there is no dirt debris or water in any part of the unit especially in the battery housing or under the o ring If any dirt...

Page 20: ...they are now free to reply i e OVER Being it a Push To Talk system like a walkie talkie unit if one person talks all other units can only listen One at a time talking Speaking in the mask for prolong...

Page 21: ...tic D A T Speaker volume adjustment 3 levels Charging time from fully discharged 1h Autonomy 25h System Type H SSB Frequency ch1 32 768 KHz ch2 41 000 KHz Working range 250 m 800 ft Low battery autono...

Page 22: ...d that have not been used incorrectly or handled negligently The unit must be returned to the outlet from which it was bought along with the warranty card Even during the guarantee period this guarant...

Page 23: ......

Page 24: ...16010 Sant Olcese Genova Italia Tel 39 010 7082011 Fax 39 010 7082099 diving oceanreefgroup com oceanreefgroup com OCEAN REEF Inc 2510 Island View Way Vista CA 92081 Phone 1 760 744 9430 Fax 1 760 744...

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