2820A-XX & 2825A-XX SERIES TWO DIVER COMMUNICATOR USER MANUAL
282XA-UM
REV 5.0
17
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) with a tender
wearing a headset 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 tasks. 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 is cut off when the other is talking,
allowing the tender and all divers to constantly communicate with each other. 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.
4.4.1
2-WIRE OPERATION
To connect the diver in 2-Wire mode, connect the communication umbilical wires to
the DIVER MICROPHONE (RED) binding post jack on the communicator as shown
in the wiring drawing in section 6. If the umbilical uses a banana plug, simply insert
the plug into the binding post jack. Verify that it is firmly and completely seated.
This may require that the external plastic nut be tightened down. If the umbilical
uses bare wires, loosen the external plastic nut of the binding post jack. Either
insert the bare end of the wire into the hole in the metal shaft of the binding post or
firmly wrap the wire around the shaft. Tighten the nut until the bare wire is firmly
fastened by the nut. The nut should not be fastened on the insulation of the wire
nor should any of the bare wires touch.
The tender can operate in the 2-Wire mode without a headset or push-to-talk
microphone. When the tender wants to talk to the diver, he presses the PUSH-TO-
TALK BUTTON on the front panel and speaks clearly into the PANEL MIC. When
done speaking, the tender releases the PUSH-TO-TALK BUTTON to allow the
diver to communicate.
When the tender uses a headset, follow the wiring diagram in section 3.8. Please
note that when in the 2-Wire mode, the tender must press the Push-to-Talk Switch
on the front panel to be heard.
When using the Amron Model 2405-28 Hand Held Push-to-Talk Microphone, follow
the wiring diagram in section 3.7. Always talk close to the microphone, with the
edge of the lip guard just touching the upper lip. This is important because the
noise-canceling feature accepts close sounds best and discriminates against
sounds greater than 1/2-inch (12 mm) away.
If using the Amron Remote Walk-and-Talk, Model 2821-28, the tender may press
the Push-To-Talk Switch on the belt module to speaker to the divers.
4.4.2
4-WIRE OPERATION
To connect the diver in Full Duplex (4-Wire) mode, connect the communication
umbilical wires to the DIVER MICROPHONE and DIVER EARPHONE jacks as
shown in wiring diagram in section 3.6. If the umbilical uses a banana plug, simply
insert the plug into the correct binding post jack. Verify that it is firmly and
completely seated. This may require that the external plastic nut be tightened. If the
umbilical uses bare wire ends, loosen the external plastic nut of the binding post
