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Slide the GSM G.divers onto the New NACS
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TM
Place back the o-ring on one of the notch at the end of the New NACS
3 . MICROPHONE
The GSM G.divers use a dynamic microphone, "D-Mic" encapsulated and protected by
a hydrophobic membrane.
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 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, 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. Remember that the
Neptune 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 be damaged if
the limits, indicated above, are exceeded. (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, not a strong "flow of water") after each dive and should be
placed in a well ventilated area that is not exposed to direct sunlight to dry.
D-Mic has not 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.
4 . PROCEDURE FOR THE ASSEMBLING OF A
PTT & D-MIC MICROPHONE ON THE MASK
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TM
• unscrew the communication port plug, insert the microphone through the
port into the mask with the hydrophobic membrane facing the visor.
• If the membrane is turned the wrong way, facing the mouth, phonic
performance will be diminished. Move the microphone so that it does not
interfere with the diver's lips or the pressure equalization system.
The D-Mic is supplied with a "flexible contacts protective band".
The band avoid the interaction of the mouth with the D-Mic connectors.
5 . CHECKING BEFORE USE
Once the battery has been installed and you have checked that the cap and cover have
been closed properly, dampen your fingers and touch the two screws (On/Off switch
contacts) and activate the polarity circuit. You will hear a "beep" indicating activation.
Run another finger along the antenna. You will hear a "zzzzzz" type sound coming from
the speaker.
Try to bring the antenna transducer near the antenna on a M100 unit, or the antenna on
a GSM G.divers 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.
If you hear a repeated "beep" (about every 30 seconds) this means that the battery is
running low. Change it.
6 . BASIC INSTRUCTIONS FOR
UNDERWATER COMMUNICATION
The GSM G.divers is activated for reception as soon as it is immersed in water, and it
turns off a few seconds after it dries out.
When it's switched on, this is confirmed by a "beep".
Push the PTT button and the activation of the transmission mode is anticipated by
another "beep", wait until this is over before speaking.
When a message is incoming from your buddy or from the surface you'll hear the
"beep" that anticipate the transmission, breath slowly to avoid bubbles to disturb
MEMBRANE ON THIS SIDE
communication.
When speaking to other divers, remember that they are diving. 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 communications system.
Speak slowly, and pronounce each word clearly. Only speak after having sent a
call impulse by pressing the button on the microphone. It is advisable to practice
in a swimming pool before using the device in open water.
Bubbles, and especially, small air bubbles, that are in contact with or near
those communicating reduce the transmitting power. When using the unit in
swimming pools or in highly oxygenated water, coat your antenna in silicone
lubricant. This will make it more difficult for the air bubbles to adhere to it.
Obstacles such as rocks may reduce your communication range.
Owner's Manual
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