Amron AMCON II 2825R Series User manual

User Manual
For
Amron International, Inc.
Model 2825R-XX Series
Two Diver Rack Mount Communicators
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© 2018 Amron International, Inc.

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TABLE OF CONTENTS
1INTRODUCTION AND SPECIFICATIONS ..........................................................................................1
1.1 Introductions..................................................................................................................................1
1.2 Electrical Specifications ................................................................................................................1
1.3 Mechanical Specifications.............................................................................................................1
1.4 Amcom II Model 2825R-XX Two Diver Rack Mount Communicator ............................................2
2OPTIONS AND ACCESSORIES..........................................................................................................3
2.1 Options..........................................................................................................................................3
2.2 Accessories...................................................................................................................................3
3CONTROLS AND CONNECTIONS......................................................................................................5
3.1 Tender Controls ............................................................................................................................5
3.2 Tender Connections......................................................................................................................6
3.3 Diver Controls................................................................................................................................7
3.4 Diver Connections.........................................................................................................................7
3.5 Other Connections ........................................................................................................................8
3.6 Option Controls: DSP3 Helium Speech Unscrambler...................................................................9
3.7 Drawing, 2-Wire Connections .....................................................................................................10
3.8 Drawing, Full Duplex (4-Wire) Connections................................................................................11
3.9 Drawing, Push To Talk Microphone Connections.......................................................................12
3.10 Drawing, Operator Connections, Headset ..................................................................................13
4INSTALLATION AND OPERATION...................................................................................................14
4.1 Operation.....................................................................................................................................14
4.2 AC Power....................................................................................................................................14
4.3 Modes Of Operation....................................................................................................................14
4.4 Volume Controls (2-Wire)............................................................................................................16
4.5 Other Diver Controls (2-Wire) .....................................................................................................16
4.6 Volume Controls (4-Wire)............................................................................................................17
4.7 Other Tender Controls ................................................................................................................18
4.8 Options........................................................................................................................................19
5MAINTENANCE AND TROUBLESHOOTING...................................................................................20
5.1 Diver Radio Communicator Check Procedures ..........................................................................20
5.2 General Maintenance..................................................................................................................21
5.3 Recommended Maintenance Schedule......................................................................................22
5.4 Troubleshooting ..........................................................................................................................23
6DRAWINGS ........................................................................................................................................26
6.1 Parts Identifier, Front Panel, Model 2825R-01............................................................................27
6.2 Parts Identifier, Front Panel, Model 2825R-02............................................................................28
PARTS LIST .......................................................................................................................................2977.1 Amcom II Rack Mount, Model 2825R-01....................................................................................30
7.2 Amcom II Rack Mount with DSP3 Helium Speech Unscrambler, Model 2825R-02...................30
7.3 Sub Assembly 2825R-400M, Front Panel Components.............................................................30
7.4 Sub Assembly 2825R/26-400M-DSP3, Front Panel Components .............................................31
7.5 28XXR-FS-02 Spares Kit For 2825R-XX Series Communicators ..............................................31
7.6 Optional Spares ..........................................................................................................................32
8LIMITED WARRANTY AND SERVICE POLICY................................................................................33

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1 INTRODUCTION AND SPECIFICATIONS
1.1 Introductions
The 2825R-XX Series AMCOM II Rack Mount Diver Communicators are a full featured, two-
diver, hardwire communicator that uses state-of-the-art electronics to provide clear and
reliable communications. The 2825R-XX is designed for integration into a standard 19 inch
equipment rack and all necessary connections can be made via the front panel jack or rear
mounted MS connector.
For maximum safety and to enjoy all the features of the 2825R-XX, it is important that the
tender read and understand the entire manual, including all warnings, before first use.
1.2 Electrical Specifications
Input Impedance (Each Input) ................................................................................... 250 Ohms
Frequency Response ........................................................................................ 300 - 10000 Hz
Common Mode Rejection ..................................................................................40 dB Minimum
Current Drain Maximum Full Volume .............................................................................3 Amps
Minimum Quiescent ................................................................................................ 0.190 Amps
Output Impedance ........................................................................................................... 4 Ohm
Power Supply Voltage ..............................................12 VDC Nominal (9 VDC Min - 16 VDC Max)
AC Power Operating Range .................................................................... 90-264 VAC, 50-60 Hz
Sensitivity (Input) .............................................................................................................0.5 mV
Output Power (RMS @ 4 Ohm Load, 12 VDC) ..................................................10 Watts Audio
Battery Life (typical) ..................................................................................................... 45 Hours
1.3 Mechanical Specifications
Panel ....................................................................................... Anodized Brushed Aluminum
Enclosure ..........................................................................................Black Anodized Aluminum
DIMENSIONS
Length ..........................................................................................................12.5 In. (31.8 Cm)
Width ..........................................................................................................19.0 In. (48.2 Cm)
Height ............................................................................................................7.0 In. (17.7 Cm)
Weight with battery ........................................................................................ 19.5 Lbs. (8.8 Kg)

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1.4 Amcom II Model 2825R-XX Two Diver Rack Mount Communicator
The front panel contains all the controls and connections required to operate the
communicator. It is intended that the divers will be connected to the communicator using the
rear chassis MS connector, but the front panel 5-way binding post can be used as required.
The rear chassis contains the AC power inlet, recorder output and an MS connector with all the tender
and diver connections. This allows a clean installation by routing all the connections from the back in
the rack. The rear tender connections allow for the installation of a separate, remote tender station
located away from the rack.

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2 OPTIONS AND ACCESSORIES
2.1 Options
The following options are available to customize the AMCOM communicator. Options have to
be ordered at the time of purchase or the communicator has to be returned to AMRON for the
option to be installed.
2.1.1 Model 2825R-02 With DSP3 Helium Speech Unscrambler
The AMRON’s DSP3 Helium Speech Unscrambler uses state of the art Digital
Signal Processor (DSP) technology to correct raw helium speech in clear,
intelligible voice. The HSU option includes a complex noise reduction filter to
improve communications in situations with high background noise levels.
2.2 Accessories
The following accessories are available for the AMCOM communicator. Accessories can be
ordered at any time.
2.2.1 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.
2.2.2 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).
2.2.3 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).
2.2.4 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
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.

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2.2.5 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.
2.2.6 Model 3110 –Amron Chamber Speaker
The Model 3110 Chamber Speaker includes a push-to-talk switch along with a
headset connector. When the occupant(s) want to talk to the operator, the push-to-
talk switch on the chamber speaker must be pressed, even if the headset is in use.
2.2.7 Model 3115 –Amron Chamber Speaker
The Model 3115 Chamber Speaker allows the operator to monitor conversations
within the chamber with the speaker wired in 2-WIRE mode. There is a speaker
on/off switch that allows the occupants to turn off the speaker for private
conversations. The operator can talk to the occupant(s) by using the PUSH-TO-
TALK BUTTON or PUSH-TO-TALK JACK. The Model 3115 also features a
headset jack wired in Full-Duplex (4-Wire) mode that allows an occupant to use our
standard 2460-31R or deluxe 2401-31R headset to talk to the chamber operator
without the use of the PUSH-TO-TALK BUTTON or PUSH-TO-TALK JACK. This
speaker is approved for US Navy chambers.
2.2.8 Model 3113 –Amron Chamber Speaker
The Model 3113 Chamber Speaker has all the features of the Model 3115 except
for the speaker on/off switch.
2.2.9 Model 3125 –Amron Inner-Lock Combo Box
The Model 3125 features a talk-back speaker with on/off switch and headset jack
that operates in the same manner as the Model 3115. It also includes a sound-
powered phone with bracket, chamber temperature probe, scrubber power circuit
wiring, chamber environmental conditioning unit wiring and electrical penetrator
adaptor all together in a single pre-wired, pre-tested housing.
2.2.10 Model 3126 –Amron Outer-Lock Combo Box
The Model 3126 features a talk-back speaker with on/off switch and headset jack
that operates in the same manner as the Model 3115. It also includes the sound-
powered phone and bracket like the Model 3125 but does not have the additional
chamber function wiring of the 3125.

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3 CONTROLS AND CONNECTIONS
Before using the 2825R-XX diver communicator, the tender should be familiar with all the operating
controls and connections. While reading this manual, you will find capitalized words such as PANEL
SPEAKER. These words are to remind the reader that additional information can be found in this
section of the manual.
3.1 Tender Controls
The following controls are located on the front panel of the 2825R-XX/24 in the tender
section.
3.1.1 Power Switch –This switch controls power to the unit.
3.1.2 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.
3.1.3 Push-To-Talk All Divers Switch –This switch allows the tender to talk to all
divers 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.
3.1.4 Tender-To-Divers Volume –This control sets the volume for the divers’ earphone.
Rotate this knob clockwise to increase the volume.
3.1.5 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.
3.1.6 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.
3.1.7 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
battery should be recharged immediately.
3.1.8 Panel Microphone –A water-resistant condenser microphone that allows the
tender to talk to the divers using the PUSH-TO-TALK BUTTONS. On the 2825R-
XX, the volume level is controlled by the MICROPHONE VOLUME control. The
PANEL MICROPHONE is muted when the SPEAKER SWITCH is turned off.
WARNING: Do not plug or cover the PANEL MICROPHONE hole. This may
dampen the tender-to-diver communications or damage the microphone
requiring replacement.

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3.2 Tender Connections
3.2.1 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 4.10.
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
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 4.9. 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 4.11. 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.

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3.2.2 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. On the 2825R-XX, the TENDER
MICROPHONE VOLUME control adjusts the sensitivity of the input.
3.2.3 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 2825R-XX. The difference
between using the PUSH-TO-TALK JACK and PUSH-TO-TALK BUTTON is that
the button allows the tender to communicate using the PANEL MICROPHONE.
3.3 Diver Controls
The following controls are located on the front panel in the individual diver sections.
3.3.1 Diver Microphone Volume –The 2825R-XX has a separate microphone volume
control for each diver. This sets the gain for the diver’s microphone amplifier and
controls the diver’s volume level to the tender and other diver.
3.3.2 Diver Earphone Volume –The 2825R-XX has individual earphone volume
controls for each diver. This allows the tender to set the best volume level for each
diver.
3.3.3 Diver On/Off –There is a separate DIVER ON/OFF momentary switch for each
diver. This control allows the tender to temporarily cut off the microphone of an
individual diver. It can be used in 2-Wire or Full Duplex (4-Wire) modes.
3.3.4 Crosstalk –There is a separate CROSSTALK momentary switch for each diver.
Normally used in 2-Wire mode, this control allows the selected diver to talk to the
other diver while the tender monitors the conversation.
3.4 Diver Connections
3.4.1 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 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.
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
activated.