Amron AMCOM III series User manual

User Manual
For
Amron International, Inc.
Model 2830A/24 and 2830A/24-MS
Three Diver Communicator
S/N ____________________
1380 Aspen Way, Vista California 92081-8349
United States of America
Phone: [phone]
Fax [phone]
Email: [e-mail]
Web: www.amronintl.com
This manual and the information contained herein are provided for use as an operation and maintenance
guide. No license or rights to manufacture, reproduce, or sell either the manual or articles described
herein are given. Amron International, Inc. reserves the right to change specifications without notice.
Copyright© 2015 Amron International, Inc.

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TABLE OF CONTENTS
1INTRODUCTION AND SPECIFICATIONS ..........................................................................................1
1.1 INTRODUCTION...........................................................................................................................1
1.2 ELECTRICAL SPECIFICATIONS.................................................................................................1
1.3 MECHANICAL SPECIFICATIONS ...............................................................................................2
1.4 AMCOM III MODEL 2830A DIVER COMMUNICATOR................................................................3
2WARRANTY AND SERVICE POLICY.................................................................................................4
2.1 LIMITED WARRANTY ..................................................................................................................4
2.2 SERVICE POLICY ........................................................................................................................4
3OPTIONS AND ACCESSORIES..........................................................................................................5
3.1 OPTIONS......................................................................................................................................5
3.2 ACCESSORIES ............................................................................................................................5
4TENDER AND DIVER CONTROLS AND CONNECTIONS.................................................................7
4.1 TENDER AND DIVER CONTROLS..............................................................................................7
4.2 TENDER CONNECTIONS............................................................................................................7
4.3 DIVER CONNECTIONS................................................................................................................9
4.4 COMMUNICATOR MODEL 2830A-MS (MS CONNECTORS, 5 PIN) .........................................9
4.5 OTHER CONNECTIONS............................................................................................................10
4.6 OPTION CONTROLS: HELIUM SPEECH UNSCRAMBLER/26DSP3.......................................11
4.7 OPTION CONTROLS: WIRELESS TENDER, /28A OPTION ....................................................12
4.8 DRAWING, 2-WIRE CONNECTIONS.........................................................................................13
4.9 DRAWING, FULL DUPLEX (4-WIRE) CONNECTIONS.............................................................14
4.10 DRAWING, PUSH-TO-TALK MICROPHONE CONNECTIONS.................................................15
5INSTALLATION AND OPERATION...................................................................................................16
5.1 OPERATION...............................................................................................................................16
5.2 CHARGING THE BATTERY.......................................................................................................16
5.3 INITIAL POWER ON - BATTERY CONDITION CHECK............................................................16
5.4 MODES OF OPERATION...........................................................................................................17
5.5 VOLUME CONTROLS –2 WIRE................................................................................................18
5.6 OTHER DIVER CONTROLS (2-WIRE MODE)...........................................................................18
5.7 VOLUME CONTROLS (4-WIRE MODE)....................................................................................18
5.8 OTHER DIVER CONTROLS (4-WIRE MODE)...........................................................................19
5.9 WIRELESS TENDER OPTION /28A ..........................................................................................19
5.10 HELIUM SPEECH UNSCRAMBLER OPTION /26DSP3............................................................20
6MAINTENANCE AND TROUBLESHOOTING...................................................................................22
6.1 FULL DUPLEX (4-WIRE) CHECK ..............................................................................................22
6.2 2-WIRE CHECK..........................................................................................................................22
6.3 GENERAL MAINTENANCE........................................................................................................23
6.4 RECOMMENDED MAINTENANCE SCHEDULE .......................................................................23
6.5 TROUBLESHOOTING................................................................................................................25
7FULL DUPLEX (4-WIRE) - WHAT, WHY AND HOW........................................................................29
7.1 WHAT ARE 2-WIRE AND 4-WIRE MODES?.............................................................................29
7.2 WHAT IS FULL DUPLEX (4-WIRE)?..........................................................................................30
7.3 WHY FULL DUPLEX (4-WIRE)?.................................................................................................31
7.4 HOW DO YOU USE FULL DUPLEX (4-WIRE)? ........................................................................31

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8DRAWINGS ........................................................................................................................................33
8.1 PARTS IDENTIFIER, FRONT PANEL MODEL 2830A/24 .........................................................34
8.2 PARTS IDENTIFIER, FRONT PANEL MODEL 2830A/24-MS...................................................35
8.3 PARTS IDENTIFIER, MODEL 2826DSP3 & 28A OPTIONS......................................................36
9PARTS LIST GENERAL.....................................................................................................................37
9.1 AMCOM III MODEL 2830A/24....................................................................................................38
9.2 AMCOM III MODEL 2830A/24/26DSP3......................................................................................39
9.3 AMCOM III MODEL 2830A/24/28A.............................................................................................40
9.4 AMCOM III MODEL 2830A/24-MS..............................................................................................41
9.5 AMCOM III MODEL 2830A/24/28A-MS......................................................................................42
9.6 AMCOM III MODEL 2830A/24/26DSP3-MS...............................................................................43
9.7 2820-301 CASE ASSEMBLY......................................................................................................44
9.8 2830A-400M FRONT PANEL ASSEMBLY.................................................................................44
9.9 2824-500B BATTERY BOX INTERNAL CHARGER ..................................................................45
9.10 28XXA-FS-01 FIELD SPARES KIT FOR 2830A ........................................................................45
9.11 OPTIONAL SPARES ..................................................................................................................46

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1 INTRODUCTION AND SPECIFICATIONS
1.1 INTRODUCTION
The AMCOM III series of diver communication systems are full-featured, hard wire, three-
diver communicators. The AMCOM III has independent microphone and earphone volume
controls for each diver and the tender.
All AMCOM III series have push-to-talk, and separate isolated inputs for each diver. The
AMCOM III Model 2830A/24 is a portable three diver communication system, delivering 20
Watts of "voice power", operating from either a 110/220 VAC, an external 12 VDC power
source, or an internal 12 VDC backup battery.
The Model 2830A has the capability of 2-wire and/or Full-Duplex (4-wire) communication
modes. 2-Wire and Full-Duplex (4-wire) modes can be used simultaneously. Full-Duplex is a
communications system designed from the "ground-up" to take advantage of the current
"state of the art" in semiconductor technology and provide superior diver hard wire
communication.
This portable diving communicator has the ability to work with the Dynamic and Pre-Amplifier
microphone in both 2-wire and 4-wire modes. This unique design has the ability to detect
both pre-amp and dynamic diver microphones that are in use. This feature will automatically
switch from a preamp mode to a dynamic mode and will adjust the specific diver gain
(volume).
The Model 2830A’s with 20 watts of power is the most powerful communicator on the market.
The untouched volume and clarity allows the tender’s volume to be set at very high levels
especially in noisy environments while the divers are at a comfortable listening level.
1.2 ELECTRICAL SPECIFICATIONS
Input Impedance (Each Input) .................................................................................. 250 Ohms
Frequency Response ........................................................................................ 300 - 10000 Hz
Common Mode Rejection (minimum) ................................................................................40 dB
Current Drain Maximum Full Volume .............................................................................3 Amps
Typical Quiescent ............................................................................0.25 mAmps
Minimum Load Impedance ...............................................................................................2 ohm
Nominal Power Supply Voltage ....................................................................................... 12 VDC
Operational Supply Voltage ...........................................................90-264 Volts AC, 47-440 Hz
Sensitivity (Input) .....................................................................................................0.5 mVRMS
Maximum Output Power (4 Ohm Load, 14 VDC) ...........................................................20 Watts
Battery Life (typical) ..................................................................................................... 15 Hours

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1.3 MECHANICAL SPECIFICATIONS
Panel .....................................................................................Powder Coated Stainless Steel
Enclosure .................................................................................... High Impact Resistant Plastic
DIMENSIONS
Length ............................................................................................................14.5 in. (36.8cm)
Width ..............................................................................................................9.0 in. (22.9cm)
Height ............................................................................................................10.0 in. (25.4cm)
WEIGHT WITH BATTERIES
2830A/24 ......................................................................................................18.73 Lbs. (8.50kg)
2830A/24-MS................................................................................................18.90 Lbs. (8.60kg)
2830A/24/26DSP3....................................................................................... 19.28 Lbs. (8.74Kg)
2830A/24/26/DSP3-MS ............................................................................... 19.45 Lbs. (8.80Kg)
2830A/24/28A with Remote Wireless Tender Kit...................................... 23.48 Lbs. (10.65Kg)
2830A/24/28A-MS with Remote Wireless Tender Kit ............................... 23.63 Lbs. (10.27Kg)

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1.4 AMCOM III MODEL 2830A DIVER COMMUNICATOR
The Model 203-A AMCOM II is a full-featured, hard wired diver communicator. It features individual
earphone volume controls for the tender (uplink) and each diver (downlink) earphones along with
individual microphone level controls for maximum flexibility. Divers can be individually wired in either
2-Wire or 4-Wire mode. The 2830A diver microphone inputs automatically detect if a pre-amplified
microphone is being used and adjusts the system gain. This allows mix use of pre-amplified and
dynamic microphones. It can be ordered in the following configurations:
Standard model (2830A/24 - shown above)
With MS connectors for military umbilical lines (2830A/24-MS)
With Wireless Tender Option (2830A/24/28A)
With Wireless Tender Option and MS connectors (2830A/24/28A-MS)
With Helium Speech Unscrambler DSP3 (2830A/24/26DSP3)
With Helium Speech Unscrambler and MS connectors (2830A/24/26DSP3-MS)

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2 WARRANTY AND SERVICE POLICY
2.1 LIMITED WARRANTY
AMRON INTERNATIONAL, INC., (Amron) warrants that its products are free from defects in
material and workmanship under normal use and service for a period of 90 days from date of
shipment as described in Amron literature covering this product. Amron’s obligation under
this warranty is limited to the repair of or replacement, at Amron’s option, of defective
material. This warranty shall not cover defects which are the result of misuse, negligence,
accident, repair or alterations.
2.2 SERVICE POLICY
For technical assistance or to request a repair, please call [phone], Monday –Friday,
8 a.m. to 5 p.m. PT. Have the model number and serial number handy and be prepared to
offer as much information as possible about the problem.
Please do not return any product without obtaining a return authorization number. Detailed
instructions will be provided at the time of request.

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3 OPTIONS AND ACCESSORIES
3.1 OPTIONS
Amron produces this communicator with a series of options.
3.1.1 -MS
The communicator is equipped with MS connectors for the diver microphone and
earphone. These are compatible with standard US Navy diver umbilical. This
option can be ordered with /26DSP3 and /28A options.
3.1.2 MODEL /26DSP3 –HELIUM SPEECH UNSCRAMBLER (HSU)
Amron’s DSP3 HSU uses state-of-the-art Digital Signal Processor (DSP)
technology to correct raw helium speech into clear, intelligible voice. The /26DSP3
option includes a complex noise reduction filter to improve communications in
situations with high background noise levels.
3.1.3 MODEL /28A –WIRELESS TENDER OPTION
The communicator is equipped with a wireless module and includes a Model 2829-
11 Wireless Tender Headset. The wireless headset allows the tender freedom to
move around. It requires the divers to be wired in 4-Wire mode.
3.2 ACCESSORIES
Amron produces a series of accessories designed to operate with the entire line of AMCOM
communicators.
3.2.1 MODEL 2401-28 –AMRON HEAVY-DUTY HEADSET
The Model 2401-28 is a heavy-duty headset with boom microphone. It comes
equipped with color-coded, dual banana plugs that mate directly to AMCOM diver
communicators. It includes a 6-foot (1.8-meter) cord.
3.2.2 MODEL 2460-28 –AMRON STANDARD HEADSET
The Model 2460-28 is a light and comfortable headset designed for extended wear
at an economical price. It comes equipped with color-coded, dual banana plugs
that mate directly to AMCOM diver communicators as well as a spiral cord that can
be extended up to 8 feet (2.4 meters).
3.2.3 MODEL 2405-28 –AMRON PUSH-TO-TALK MICROPHONE
The Model 2405-28 is a hand-held, noise canceling, push-to-talk microphone that
provides excellent sound quality to the diver. It comes equipped with a spiral cord
that can be extended up to 6 feet (1.8 meters).
3.2.4 MODEL 2822-28 –AMRON REMOTE WALK-AND-TALK MODULE
Designed for Full Duplex (4-Wire) applications, the Model 2822-28 provides the
tender with mobility around the dive site while maintaining communications with the

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diver. It comes equipped with a small clip-on belt module that contains the
connectors for the headset, and 25 feet (7.6 meters) of lightweight flexible cable.
Custom cable lengths are available.
3.2.5 MODEL 2821-28 –AMRON REMOTE PUSH-TO-TALK MODULE
Designed for 2-Wire applications, the Model 2821-28 provides the tender with
mobility around the dive site while maintaining communications with the diver. It
comes equipped with a small clip-on belt module that contains a Push-to-Talk
switch, connector for the headset, and 25 feet (7.6 meters) of lightweight flexible
cable. Custom cable lengths are available.
3.2.6 MODEL 2829-11 –AMRON WIRELESS TENDER HEADSET
A heavy-duty headset combined with a wireless belt module that is compatible with
the /28A option. One headset comes with communicators ordered with the /28A
options but additional headset can be ordered to allow other crew member to
monitor communications.

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4 TENDER AND DIVER CONTROLS AND CONNECTIONS
Before using the AMCOM III series diver communications system, you should familiarize yourself with
its operating controls and connections. Improper use of controls and connections will deprive the user
of the full benefits of this communication system. We strongly recommend the tender read FULL
DUPLEX (4-WIRE) –WHAT, WHY AND HOW located in section 7 of this manual.
4.1 TENDER AND DIVER CONTROLS
4.1.1 POWER SWITCH –This switch controls power to the unit.
4.1.2 SPEAKER SWITCH –This switch allows the tender to turn off the speaker. If the
tender is using a headset, it may be necessary to turn off the speaker in order to
prevent acoustic feedback.
4.1.3 PUSH-TO-TALK BUTTON –This button allows the tender to talk to the diver when
operating in the 2-Wire mode. It is not necessary to use this control in the Full
Duplex (4-Wire) mode. When using Full Duplex mode, this control allows the
tender to interrupt the diver by forcing the diver into listen only mode.
4.1.4 TENDER TO DIVER VOLUME –This control sets the volume for the diver's
earphone. Rotate this knob clockwise to increase the volume.
4.1.5 DIVER TO TENDER VOLUME –This control sets the volume for the tender's
earphone and/or panel speaker. Rotate this knob clockwise to increase the volume.
4.1.6 PANEL SPEAKER –A waterproof, acoustic horn speaker that allows the tender to
listen to the divers. The volume level is controlled by the EARPHONE VOLUME
control and it can be turned off using the SPEAKER SWITCH.
4.1.7 BATTERY CONDITION INDICATOR –A steady GREEN light indicates battery
charge level is good. Blinking GREEN light indicates battery charge level is at a low
level with less than 3 hours of running time available. Steady RED light indicates
battery charge level is below the level necessary to guarantee proper operation.
WARNING: When BATTERY CONDITION INDICATOR is steady RED light, the
batteries should be replaced or recharged immediately.
4.2 TENDER CONNECTIONS
4.2.1 TENDER HEADSET JACK –This is the dual banana jack (color-coded black) that
functions as both an output (earphone) and input (microphone) for the tender as
controlled by the PUSH-TO-TALK BUTTON and PUSH-TO-TALK JACK. Using this
connection, the tender can be wired in either 2-Wire or Full Duplex (4-Wire) mode
regardless of the mode used for the diver.
To connect the tender in the Full Duplex (4-Wire) mode, connect the earphone
(black) banana plug of the headset to this jack and the microphone (red) to the
TENDER MICROPHONE jack (red) as shown in the wiring diagram in section 4.9.
In this mode, the tender does not have to use the PUSH-TO-TALK BUTTON to
communicate with a diver who is also connected in the Full Duplex (4-Wire) mode.
This configuration can be used even if the diver is connected in 2-Wire mode. In

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that situation, the tender is required to use the PUSH-TO-TALK BUTTON or
PUSH-TO-TALK JACK.
The headset microphone is always active, which means that there can be acoustic
feedback between the PANEL SPEAKER and the microphone if the tender is near
the communicator. To prevent this, the PANEL SPEAKER can be turned off using
the SPEAKER SWITCH. Another option is to move the tender away from the
communicator by using the Amron Model 2822-28 Walk-and-Talk Module
accessory. This allows the tender to communicate while other members of the
surface crew listen using the PANEL SPEAKER. This module comes with 25 feet
(7.6 meters) of cable (custom cable lengths are available).
The tender can also be connected in 2-Wire mode by stacking both the earphone
(black) and microphone (red) banana plugs into this jack as shown in the wiring
diagram in section 4.8. The diver does not have to be connected in 2-Wire mode if
the tender is in 2-Wire mode. In order to talk to the diver, the tender must use
either the PUSH-TO-TALK BUTTON or PUSH-TO-TALK JACK. Since the headset
microphone is not active until one of the push-to-talk methods is used, there is no
chance for acoustic feedback to occur and surface conversation or noise is not
transmitted to diver and the PANEL SPEAKER can be left on. This may, for some
situations, make for a better overall diving experience. If the tender requires more
mobility at the dive site, the Amron Model 2821-28 Remote Push-to-Talk Module
can be used to extend the headset cable. It includes a push-to-talk button on a clip-
on belt module and comes standard with 25 feet (7.6 meters) of cable (custom
cable lengths are available).
The tender may also use the optional Amron Model 2405-28 Push-to-Talk
Microphone. This microphone comes with two color-coded banana plugs. The
black plug goes into the TENDER HEADSET jack and the yellow plug goes in the
PUSH-TO-TALK JACK as shown in the wiring diagram in section 4.10. To
communicate with the diver, the tender presses the button on the side of the
microphone. There is no chance of acoustic feedback since the PANEL SPEAKER
is cut off when the tender uses the microphone. When using the Push-to-Talk
Microphone, the SPEAKER SWITCH must be turned on in order to hear the diver.
4.2.2 TENDER MICROPHONE JACK –This is a dual banana jack (color-coded red) that
functions as the microphone input from the tender's headset. It is only used if the
tender is in Full Duplex (4-Wire) mode.
4.2.3 PUSH-TO-TALK JACK –This is a dual banana jack (color-coded yellow) that
allows for remote keying of the push-to-talk function of the communicator. It is use
by the Push-To-Talk Microphone (Amron Model 2405-28) and the Remote Walk-
And-Talk Module (Amron Model 2822-28).
The difference between using the PUSH-TO-TALK JACK and PUSH-TO-TALK
SWITCH is that the switch allows the tender to communicate using the PANEL
MICROPHONE. If both are used at the same time, the PANEL MICROPHONE is
active. This allows another crew member to talk to the diver using the PANEL
MICROPHONE even if the tender is away from the communicator using the
Remote Push-to-Talk Module in 2-Wire mode.

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4.3 DIVER CONNECTIONS
4.3.1 DIVER MICROPHONE –This is a dual 5-way binding post jack (color-coded red)
that functions as both an output (earphone) and input (microphone) for the diver as
controlled by the PUSH-TO-TALK BUTTON and PUSH-TO-TALK JACK. Using this
connection, the diver can be wired in either 2-Wire or Full Duplex (4-Wire) mode
regardless of the mode used for the diver.
To connect the diver in 2-Wire mode, connect both the diver microphone and
earphone to this jack. If the diver umbilical uses banana plugs, simply stack both
plugs into this jack as shown in the wiring diagram in section 4.8. In this mode, the
diver microphone will be active and heard on tender headset and/or PANEL
SPEAKER unless the PUSH-TO-TALK BUTTON or PUSH-TO-TALK JACK is used.
When a pre-amp microphone is used in the 2-Wire mode setup, it is required to
have special speakers supplied only by Amron. Contact Amron for more
information.
To connect the diver in Full Duplex (4-Wire) mode, connect the diver microphone to
this jack and the diver earphone the DIVER EARPHONE jack as shown in the
wiring diagram in section 4.9. The diver can use this mode even if the tender is
wired in 2-Wire mode.
4.3.2 DIVER EARPHONE - 4 Wire, (Diver 1, 2 & 3) –This is a dual 5-way binding post
jack (color-coded black) that functions as the output for the diver's earphone. It is
only used when the diver is in Full Duplex (4-Wire) mode.
4.4 COMMUNICATOR MODEL 2830A-MS (MS CONNECTORS, 5 PIN)
UMBILICAL CONNECTORS
Each diver has one MS Connector. The MS Connector has 5 pins for contacts.
4.4.1 Pin A and Pin B (Input/Output) –Functions as a microphone (input) and as an
earphone (output) when PTT switch is depressed (used in both 2 & 4-wire mode).
In the 2 wire mode of operation the microphone is connected into the Umbilical
Connector Pin A & B; also the Earphone is connected into Umbilical Connector Pin
A & B. Conversation’s (up-link & down-link) are switched automatically when push
to talk switch is actuated. When a pre-amp microphone is used in the 2-wire mode
setup, it is required to have special speakers supplied only by Amron. Contact
Amron for more information.
In Full Duplex (4-wire) mode, only the diver microphone is connected into umbilical
connector pin A & B.
4.4.2 Pin C and Pin D (Output) –It is the connection point for the diver’s earphone when
operating in the Full Duplex mode (4-wire).
4.4.3 Pin E (Earth Ground) –Connected to communicator chassis and ground of AC
cord. When communicator AC cord ground pin is contacted to Earth Ground, then
Pin E of each diver MS Connector will become Earth Ground.)

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4.5 OTHER CONNECTIONS
4.5.1 EXTERNAL BATTERY (INPUT) –External 12 VDC power input, to operate the unit
from an external battery or power source. Power requirements are 12 Volts DC
(nominal), not less than 9.5 or more than 18 volts. Source must be able to supply a
peak current of 3 Amps for proper operation. These jacks are used for charging the
internal batteries.
It is highly recommended to use an Amron External Charger, Model 2823-603 as
external power supply. The Amron External Charger was specifically designed for
use with all Amron communicators and has a high degree of insulation between the
primary and secondary circuits for diver protection and safety.
WARNING: When using the EXTERNAL POWER SOURCE, it is required to
use an isolated DC power supply that has very low ripple voltage. It has to be
properly isolated from AC line for diver protection and safety. An improperly
isolated power supply could cause diver electric shock.
4.5.2 RECORDER OUTPUT –This is a single RCA Phono jack (color-coded black) that
provides a transformer isolated signal of both the diver and tender
communications. It is designed to drive the standard line-level inputs of audio or
video recorders with input impedances as low as 600 Ohms.
4.5.3 AC POWER –AC power cord is mounted in the option panel located on right side
of the communicator front panel. The option panel has an AC power indicator to
identify the presence of AC power.
The communicator operates over a voltage range of 90-264 VAC with a frequency
range of 47-440 Hz. There is no user action requires as the power supply
automatically adjusts to the input voltage provided.

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4.6 OPTION CONTROLS: HELIUM SPEECH UNSCRAMBLER/26DSP3
The controls for the DSP3 Helium Speech Unscrambler (HSU) are located in the options
panel on the right side of the front panel as shown below.
4.6.1 ON/OFF SWITCH –Allows the selection of air (OFF) or helium (ON) operation. In
the OFF position, the divers’ microphone signal bypasses the HSU. In the ON
position, the microphone signals are routed to the HSU and the tender can adjust
the controls as necessary.
4.6.2 TREBLE BOOST –Selects the amount of gain added to the High Frequency (HF)
portion of the divers’ microphone signals. This compensates for the HF drop-off in
the sensitivity of most microphones. The TREBLE BOOST feature allows for
optimum frequency enhancement and improved intelligible speech from the diver’s
voice.

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4.6.3 DEPTH CONTROL –Selects the amount of frequency correction performed by the
HSU to produce intelligible speech. This control uses a multi-turn potentiometer
and is equipped with a turn counting knob and lock. Once the desired setting is
reached, the lock can be used to prevent accidental changes to this control.
4.6.4 NOISE REDUCTION FILTER –The Noise Reduction Filter (NRF) uses a complex
Digital Signal Processor algorithm based on a statistical-model of human voice
activity to capture the background noise and reduce it without affecting the divers’
speech. The noise level can be reduced by up to 17 dB.
4.7 OPTION CONTROLS: WIRELESS TENDER, /28A OPTION
This option is mounted in the right hand side of the front panel. This Wireless Tender Option
is for four-wire (Full Duplex) operation only. System comes standard with a remote wireless
tender module.
4.7.1 WIRELESS OPTION PANEL –Comes standard with antenna and power on/off
switch. The “ON/OFF” switch powers the wireless PC card inside the
communicator. The antenna has a swivel and tilt that allows the antenna to be
folded down during shipment. For operation, the antenna should be pointing
upwards. For installations where the Diver Communicator is located inside a
structure, there is an optional Remote Antenna kit available. This kit allows the
antenna to be located outside the structure for maximum effective range.
IMPORTANT: When the wireless option is not used, turn the option panel switch to
“OFF”. When option panel switch is turned “ON”, the wireless remote should be
“ON”. Otherwise a static noise may be heard through the communicator’s panel
speaker as it scans for available Remote Wireless Tender.
4.7.2 REMOTE WIRELESS TENDER MODULE –This module comes standard with an
internal rechargeable battery. Headset and external 110V charger jacks are located
on remote module.
4.7.3 ON/OFF-VOLUME CONTROL –Adjusts the listening volume and turns the unit
“OFF” when it is turned completely upwards.
4.7.4 TALK PUSH BUTTON –This button is located on the top of the unit and is labeled
TALK. When it’s first turned on, the Remote Wireless Tender Module is in Standby
Mode (listen only) as indicated by the LED closest to the button being red. When
the button is pressed, the Remote Wireless Tender Module is in “Talk Mode” (listen
and talk, full duplex) and the LED is green. Pressing the TALK button toggles
between the two modes. Multiple Remote Wireless Tender Modules can be in the
Standby (listen only) mode at the same time. Only one module can be in the talk
mode.
4.7.5 HEADSET JACK –Located on the side opposite to the ON/OFF-Volume Control.
Plug the remote wireless headset to this Jack.
4.7.6 CHARGE JACK –Located on the side next to the ON/OFF-Volume Control. Plug
the remote wireless charger to this jack.

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4.8 DRAWING, 2-WIRE CONNECTIONS

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4.9 DRAWING, FULL DUPLEX (4-WIRE) CONNECTIONS

2830A THREE DIVER COMMUNICATOR USER MANUAL
2830A-UM
REV 5.0
15
4.10 DRAWING, PUSH-TO-TALK MICROPHONE CONNECTIONS

2830A THREE DIVER COMMUNICATOR USER MANUAL
2830A-UM
REV 5.0
16
5 INSTALLATION AND OPERATION
5.1 OPERATION
The 2830A comes in a yellow, rugged plastic case. To open the enclosure: release the two
latches on the front of the unit and raise the lid. The lid of the communicator can be removed
by sliding the lid to the side.
The AMCOM III panels are graphically dived into sections: Tender Controls, Diver Controls,
and Power input. Items within these areas are functions or controls relating to the Tender,
Diver(s) or power items.
5.2 CHARGING THE BATTERY
The AMCOM III portable diver communicators are supplied with a gel cell sealed lead acid
battery, with an internal charger. To charge the batteries, connect the unit to a 110/220 VAC
outlet. The charger has an universal input voltage range of 90-264VRMS with a frequency
range of 47-440Hz. Always use a power cord approved for the country of use. It may be
purchased locally or ordered from AMRON.
It is recommended the unit be placed on charge, and left on charge, until the unit is to be
used again. This ensures the unit will always be ready to use, and the batteries are fully
charged. The charger is designed not to damage the batteries when left on continuous
charge. Full charge will occur in roughly 10 hours (depending on the age of the battery and
the surrounding temperature). If the unit is in constant use (daily) it is recommended the unit
be left on charge during the weekend to top off the batteries. Batteries must be recharged
periodically, a minimum of at least once every six months.
Operating time for the rechargeable batteries depends upon the age of the batteries. Gel Cell
batteries have a life of 300 cycles, or 3 years. Gel cell batteries do not have memory;
therefore they can be placed on charge at any time.
NOTE: Do not continue to operate rechargeable batteries below the low battery condition or
permanent damage will occur. When the battery condition indicator turns to red color, shut
unit off and charge batteries.
5.3 INITIAL POWER ON - BATTERY CONDITION CHECK
Turn all the volume controls to minimum and turn on the POWER SWITCH. The state of the
battery is shown on the BATTERY CONDITION INDICATOR as follows:
STEADY GREEN –the battery is good and has more than 30% remaining life
BLINKING GREEN –the battery is low and has less than 30% remaining life
OFF or NO LIGHT the battery is depleted and needs to be changed/recharged before
use
The BLINKING GREEN light provides a warning that the battery is low and should be
changed or recharged before starting the dive operation. When the indicator starts BLINKING
GREEN during dive operations, there is, depending on age of the battery and the ambient
temperature, approximately 4 hours of remaining life for the 2830A. This should be sufficient