2825R TWO DIVER RACK MOUNT COMMUNICATOR USER MANUAL
2825R-UM
REV 3.0
18
When the tender uses a headset or push-to-talk microphone, follow the connection
instruction in section 4.2.1 and in the wiring diagram in sections 4.9 and 4.10.
When using the Amron Model 2821-28 Push-to-Talk Microphone, the tender
presses the push-to-talk button on the side of the microphone and speaks clearly at
a distance of between 1 and 2 inches (25 to 51 mm). When done speaking, the
tender releases the push-to-talk button to allow the diver to communicate.
In 2-wire mode the tender must press the Push-to-talk Switch to be heard. If you
are using the Amron Remote Push-to-Talk, Model 2821-28, the tender may press
the Push-to-talk Switch on the belt module.
5.4.2
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 4.10. 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
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 diver microphone will be
louder in Full Duplex (4-Wire) mode than in 2-Wire mode. This can be a significant
advantage when using longer dive umbilical cables.
To use Full Duplex (4-Wire) mode, the tender must use a headset and connect per
the instructions in 4.2. The tender will have to use the PUSH-TO-TALK BUTTON to
communicate if the diver is in 2-Wire mode. When the tender uses a headset, the
SPEAKER SWITCH should be turned off to prevent acoustic feedback. Acoustic
feedback can also be avoided by moving the tender away from the 2825R by using
the Amron Model 2822-28 Remote Walk-and-Talk Module. In this way, the PANEL
SPEAKER can allow other members of the diving crew to monitor the dive
operation or to communicate to the diver by pressing the PUSH-TO-TALK
BUTTON and talking into the speaker.
NOTE
:
Diver microphone is louder in 4-wire than 2-wire operation.
Tender earphone is louder than divers earphones for both 2-wire and 4-wire
operation.
Tender earphone is about four times louder than diver's earphone.
5.5
Volume Controls
– 2-Wire
Turn power switch to ON, turn speaker switch to ON, and adjust both volume controls to mid-
scale. Tender has to depress PUSH-TO-TALK BUTTON in order to talk to diver. Tender and
Diver talk to each other during Tender adjusting volume controls as below:
NOTE
: The upper row of volume controls, set the microphone volume, the lower row of
volume controls, set the earphone volume. Tender controls are considered master controls.