2820A-XX & 2825A-XX SERIES TWO DIVER COMMUNICATOR USER MANUAL
282XA-UM
REV 5.0
18
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 wiring diagram in section 3.6. When not wearing a headset, the tender will have
to use the PUSH-TO-TALK BUTTON to communicate to the divers. The tender can
also use the PUSH-TO-TALK BUTTON to cut off the AUDIO AUXILIARY INPUT
signal from the diver even if the tender is connected in Full Duplex (4-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
communicator by using the Amron Model 2822-28 Remote Walk-and-Talk Module
with 25-foot-long cable or the 28B Wireless Tender Option.
NOTE
: Acoustic feedback may occur when operating with a standby diver who
does not have his hat/helmet on. This can be avoided by turning his DIVER
MICROPHONE VOLUME control down. This cuts off his microphone but will
enable him to monitor the diver/tender conversation via his earphone.
4.5
VOLUME CONTROLS (2-WIRE)
4.5.1
Turn power switch to ON, turn speaker switch to ON.
4.5.2
If a headset is available, the tender should use it initially to talk and listen to
himself. If adjustments are required, increase or decrease volume (controls). This
will establish a system volume level.
4.5.3
If a headset is not available, adjust all volume controls to mid-scale. Tender has to
depress PUSH-TO-TALK BUTTON in order to talk to divers. One diver at a time,
the Tender and Diver talk to each other during Tender adjusting volume controls as
below:
4.5.4
Tender - While diver is speaking, adjust Tender Volume Control to a comfortable
level.
4.5.5
Diver - Depress the push-to-talk switch and while talking into the panel
microphone, adjust diver volume control to a comfortable level for the diver.
4.6
VOLUME CONTROLS FULL DUPLEX (4-WIRE)
4.6.1
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. The optimum settings are when controls are closely matched, with
differences compensating for differences in diver levels.
