Ocean Reef GSM Owner's Manual - page 6
4
INSTALLING THE MICROPHONE
The GSMs use a dynamic microphone, ”
D-Mic” encapsulated and protected
by a hydrophobic membrane (see fig. 4).
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, shown in figure 4, is fitted with a membrane that is
designed to handle pressure of more than 14.7 PSI.
If the membrane
ruptures, the microphone will flood causing transmission to cease.
Remember, the Neptune masks are designed to operate under “balanced”
pressure. If the mask is removed underwater the microphone WILL NOT
suffer any damage. However, continuing to dive 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 “jet of water”) after
each dive and should be placed in a well ventilated area that is not exposed
to direct sunlight to dry.
PROCEDURE FOR THE ASSEMBLING OF A PTT & D-MIC MICROPHONE
• unscrew the communication port plug (COMMUNICATION), insert the
PTT & microphone through the mask into the “communication” port
with the hydrophobic membrane facing the visor.
•
If the membrane is turned the wrong way, facing the mouth, phonic
performance will be diminished. Check that the microphone is in the
position shown in figure 8. Move the microphone so that it does not
interfere with the diver’s lips or the pressure compensation bracket.
The D-MIC is supplied with a “flexible contacts protective band”.
The band avoid the interaction of the mouth with the D-MIC connectors.
fig. 5
fig. 4
fig. 6