Amron AMCOM III 2830A/24, Руководство пользователя, Страница: 21 / 50

2830A THREE DIVER COMMUNICATOR USER MANUAL
2830A-UM REV 5.0
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time to safely complete dive operations. A battery that has not been used for a long period of
time will exhibit a higher voltage than the actual charge state. This is known as surface
charge and will quickly dissipate once the unit is turned on. It is recommended that the unit
be left on for 5 minutes before relying on the BATTERY CONDITION INDICATOR.
5.4 MODES OF OPERATION
The Models 2830A the ability to operate in either 2-Wire or Full Duplex (4-Wire). Both the
diver and tender can be connected in either mode and a combination of modes can be used.
If either the diver or the tender is wired in 2-Wire mode, the tender must use a push-to-talk,
either the PUSH-TO-TALK BUTTON or PUSH-TO-TALK JACK, when talking to the diver.
2-Wire communication is defined as a single communication path, normally the diver is the
priority signal path
–
tender listens to diver. Signal reversing is accomplished by pushing the
PUSH-TO-TALK BUTTON
–
diver hears tender. Often times a 4-conductor communication
cable is used with 2 wires tied together as a pair for redundancy, this is still a 2-Wire system.
Since only one person can talk at a time, there is a level of discipline that goes with using 2-
Wire mode in order to obtain clear communication. One advantage of 2-Wire is that the
tender's microphone is not active unless one of the two push-to-talk controls, PUSH-TO-
TALK BUTTON or PUSH-TO-TALK JACK, are active. This eliminates any possible acoustic
feedback between the tender's microphone and the PANEL SPEAKER. It also prevents noise
from the surface reaching the diver and allows the tender to communicate with other
members of the surface crew without involving the diver.
Full Duplex (4-Wire) communication is defined as a dual communication path, a signal path
(a pair of wires) for up-link and a signal path (a pair of wires) for down link. A common
example of Full Duplex communication is the telephone. Full Duplex (4-Wire) has the
advantage of natural communication without having to use the PUSH-TO-TALK BUTTON.
This keeps the tender's hands free to perform other task. It does not require the same level of
discipline to achieve clear communications that 2-Wire does. It has the advantage that
neither the diver nor the tender are cut off when the other is talking. Because the diver's
microphone is not connected in parallel with the earphone, the diver is louder and potentially
clearer in Full Duplex (4-Wire) mode. More information on this mode can be found in Section
7, FULL DUPLEX (4-WIRE) - WHAT, WHY AND HOW.
5.4.1 2-WIRE
For communicator model 2830A (Binding Post Connectors) - Connect the
communications cable from the divers umbilical (hat/helmet) to Diver 1, Diver 2
and/or Diver 3, microphone (input) under the words 2-wire. Wires should be well
fastened to the binding posts and not touching each other. If more than one diver is
connected to any input, (Diver 1, Diver 2 or Diver 3), the divers on the same two
terminals will not be able to cross-talk (talk to each other).
For communicator model 2830A-MS (MS Connectors, 5 PIN) - Connect the
communications cable from the divers umbilical (hat/helmet) to Diver 1, Diver 2 and
Diver 3, Umbilical MS Connector Pin A & B. Pin A should have one of microphone
wires and one of earphone wires, same thing for Pin B. Wires should be well
soldered to the mating connector. Pin A & B wires should not touch each other.