| Neptune II | Neptune II NIRA | Communications | Shield Display |
|
|||||||||
|
|
" The
sea awoke at midnight from its sleep, and round the pebbly beaches far
and wide I heard the first wave ofthe rising tide rush onward with uninterrupted
sweep..." |
||
Communication Systems Since the beginning of Scuba Diving, divers have always wanted to be able to talk easily underwa ter. So far, the only systems available have been for commercial diving. Unfortunately, these systems are rather complicated, cumbersome and very expensive. Ocean REEF has designed a communica tion system which is easy to use, lightweight, compact and within the recreational diver's budget. It has many applications both for the professional and recreational diver such as scuba instruction, research, underwater surveying and repairs or guided dive tours identifying marine life, just to name a few. The Ocean REEF underwater communication system adds a whole new dimension of safety in diving by simplifying the work of diving instructors and guides as well as countless applications in the scientific and commercial fields. GSM DAT TM The GSM DAT" (code 33116) underwater transceiver unit incorporates the latest innovation in under- water ultrasonic 2-Way Radio communication; featuring a digital driver for vocal message equaliza- tion and an automatic system for activating (DAT™) transmission. The GSM DAT™ can be used on the Ocean Reef Neptune II Full Face Mask, preferred, or on other Full Face Masks fitted with a standard DIN female connection. Underwater communication technology is accomplished with ultrasound and is started by a PTT, Push To Talk, microphone button, which must be pressed to activate transmission and released to receive. The standard frequency is the same for all units, so it is possible to talk directly with any other GSM DAT" or GSM models, all M-101A receive units, surface M-105 Digital units and all previous surface systems (MI 03 - MI 04 - MI 05). The GSM DAT™ sound qualities depend both on the D-Mic microphone and the microprocessor (DSP), which takes the digitized vocal message and fil- ters out unwanted noise caused by exhaust air bubbles or vibrations of the mask, particularly the visor. The GSM DAT™ system uses standard alkaline 9 VDC batteries and the exclusive "D-Mic" - a special dynamic microphone for underwater use with its high acoustic qualities,
The
D-Mic housing has a hydro pho- nicmembrane,
which is permeable to air, but prevents water from passing through into
the electronics. The membrane limits attenuation of the vocal signal thanks
to its reduced thickness. The permeable cha- racteristics of the membrane
keep the internal pressure equalized at the same level as the external
ambient pressure so that the microphone can practically be used at any
depth. The D-Mic is easily installed onto the transmission button contacts,
and is also compatible with all previous GSM versions by slightly altering
the transmission button contacts, which can be performed by our Service
Centers. When we talk inside a Full Face Mask, a series of reflections
and vibrations are generated which may be called "distorted frequencies." |
|||
| These
"distorted frequencies" , if they are not removed, will by amplified
and transmitted to the receiver unit and will generate a low intelligibility
in the receiver unit. With our (DSP) micropro cessor, communication is loud
and clear. DAT™ (Digital Activation Transmission) It is an Ocean REEF worldwide innovation in underwater communications for diving.
With the DAT™ system you have an option of transmitting in a hands free mode or a manual mode. All that is required to activate transmission without keeping the micro- phone button pressed down, is to press and release the button quickly, at which point, a series of impulses are sent out keeping the GSM transceiver automatically on for 30 seconds without having to keep the button pressed down. Then the unit will return to the receiving for 20 seconds with a series of impulses in a different tone from the first. This cycle goes on until the button is pressed again for at least 1 second to return to the manual mode. DAT™ is particularly useful when it is necessary to have both hands free while transmitting, making diving far more comfortable and safer. Another benefit of the DAT™system is in case of an emergency, when activated, it will emit a sequen ce of impulses every 30-20-30 seconds, ... that can be received at a great distance so that search and rescue workers can more easily make contact with the diver. The GSM DAT™ has gold plated contacts for the 9 V alkaline battery and a "low battery" warning signal that beeps every 10 seconds. |
|||
| The GSM DAT™must be always used with the NACS™ |  |
||
