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Amron 2820A User Manual

Two diver communicator
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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.
User Manual
For
Amron International, Inc.
Model 2820A and 2825A
Two Diver Communicator
S/N ____________________
1380 Aspen Way, Vista California 92081-8349
United States of America
Phone: (760) 208-6500
Fax (760) 599-3857
Email:
sales@amronintl.com
Web:
www.amronintl.com
Copyright© 2017 Amron International, Inc.

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  • Page 1 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© 2017 Amron International, Inc.

  • Page 3: Table Of Contents

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL TABLE OF CONTENTS INTRODUCTION AND SPECIFICATIONS ..................1 INTRODUCTION ........................... 1 ELECTRICAL SPECIFICATIONS ....................1 MECHANICAL SPECIFICATIONS ....................2 AMCOM II MODEL 2820A DIVER COMMUNICATOR ..............3 AMCOM II MODEL 2825A DIVER COMMUNICATOR ..............4 LIMITED WARRANTY AND SERVICE POLICY ..................
  • Page 4 2820A-400M FRONT PANEL ASSEMBLY ................53 9.12 2825A-400M FRONT PANEL ASSEMBLY ................54 9.13 2824-500B BATTERY BOX INTERNAL CHARGER ..............55 9.14 28XX-FS-01 FIELD SPARES KIT FOR 2820A, 2825A ............. 55 9.15 OPTIONAL SPARES ........................56 2820A & 2825A-UM REV 8.0...

  • Page 5: Introduction And Specifications

    AMCOM II is offered in two basic versions. The units are identical except the Model 2825A has independent microphone and earphone volume controls for each diver and the tender. The Model 2820A has a single earphone volume control for diver’s volume (down-link) and a single volume control for the tender (up-link).

  • Page 6: Mechanical Specifications

    ......................10.0 In. (25.4 Cm) Weight with Batteries Model 2820A....................17.35 Lbs. (7.87 Kg) Model 2820A/23 with External Charger ............20.53 Lbs. (9.31 Kg) Model 2820A/24 ..................17.98 Lbs. (8.16 Kg) Model 2825A....................18.20 Lbs. (8.26 Kg) Model 2825A/23 ..................21.13 Lbs. (9.58 Kg) Model 2825A/24 ..................

  • Page 7: Amcom Ii Model 2820A Diver Communicator

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL AMCOM II MODEL 2820A DIVER COMMUNICATOR The Model 2820A AMCOM II is a full-featured, hard-wired diver communicator. The 2820A features a single earphone volume control for the divers (downlink) and a volume control for the tender (uplink).

  • Page 8: Amcom Ii Model 2825A Diver Communicator

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL AMCOM II MODEL 2825A DIVER COMMUNICATOR The Model 2825A AMCOM II is a deluxe hard-wired diver communicator. The 2825A features individual earphone volume controls for each diver (downlink) as well as a volume control for the tender (uplink).

  • Page 9: Limited Warranty And Service Policy

    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.

  • Page 10: Options And Accessories

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL OPTIONS AND ACCESSORIES 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. OPTIONS MODEL /23 –...
  • Page 11 2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL MODEL 2405-28 – AMRON PUSH-TO-TALK MICROPHONE 3.2.3 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).

  • Page 12: Tender And Diver Controls And Connections

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL TENDER AND DIVER CONTROLS AND CONNECTIONS Before using the AMCOM II 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.

  • Page 13: Tender Connections

    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...

  • Page 14: Diver Controls

    MICROPHONE even if the tender is away from the communicator using the Remote Push-to-Talk Module in 2-Wire mode. DIVER CONTROLS DIVER EARPHONE VOLUME (Model 2820A) – This control sets the earphone 4.3.1 volume level to both divers. DIVER EARPHONE VOLUME (Model 2825A) – The 2825A has separate earphone 4.3.2...

  • Page 15: Other Connections And Controls

    It is strongly recommended that an Amron External Charger Model 2823-603 be used as the 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.

  • Page 16: Option Controls: Helium Speech Unscrambler/26Dsp3

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL 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. ON/OFF SWITCH – Allows the selection of air (OFF) or helium (ON) operation. In 4.6.1...

  • Page 17: Option Controls: Wireless Tender /28A Option

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL DEPTH CONTROL – Selects the amount of frequency correction performed by the 4.6.3 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.

  • Page 18: Drawing, 2-Wire Connections

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL DRAWING, 2-WIRE CONNECTIONS 2820A & 2825A-UM REV 8.0...

  • Page 19: Drawing, Full Duplex (4-Wire) Connections

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL DRAWING, FULL DUPLEX (4-WIRE) CONNECTIONS 2820A & 2825A-UM REV 8.0...

  • Page 20: Drawing, Operator Connections, P-T-T Microphone

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL 4.10 DRAWING, OPERATOR CONNECTIONS, P-T-T MICROPHONE DRAWING, OPERATOR CONNECTIONS, HEADSET 2820A & 2825A-UM REV 8.0...
  • Page 21 2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL 2820A & 2825A-UM REV 8.0...

  • Page 22: Installation And Operation

    1kV! Such spikes can be high enough to cause the input fuses on the battery charger to blow and, in extreme cases, actually damage the charger circuitry. Amron has designed the Model 2823-603 (/23 Option) battery charger and the internal battery charger (/24 Option) to isolate such faults to ensure that they will not cause a safety issue for the diver or tender.

  • Page 23: Battery Condition

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL 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, turn the unit off and charge batteries.

  • Page 24: Modes Of Operation

    MODES OF OPERATION The Model 2820A and 2825A have the ability to operate in either 2-Wire or Full Duplex (4- Wire). Both the diver and tender can be connected in either mode and a combination of modes can be used. If either the diver or the tender is wired in 2-Wire mode, the tender must use a push-to-talk, either the PUSH-TO-TALK ALL SWITCH or PUSH-TO-TALK JACK, when talking to the diver.
  • Page 25 4.2 and in the wiring diagram in sections 4.8 and 4.10. When using the Amron Model 2405-28 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).

  • Page 26: Volume Controls - 2-Wire

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL weaker than the others. It is strongly advised that the setup be carefully tested before use. VOLUME CONTROLS – 2-WIRE Turn unit ON; adjust all volume controls to mid-scale. For 2-Wire Mode, Tender has to depress PTT Switches in order to talk to Divers.

  • Page 27: Other Diver Controls - (2-Wire)

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL Diver 2  Diver 2 Earphone Volume – Tender talks while depressing Diver 2 PTT Switch, diver 2 determines a comfortable listening level, having the tender adjust as needed.  Diver 2 Microphone Volume – Diver 2 talks while tender adjusts to a comfortable listening level.

  • Page 28: Other Diver Controls (4-Wire Mode)

    Connect tender headset earphones to headset (input), and headset microphone to Tender Microphone (input). Turn speaker off to avoid acoustic feedback. Operation with speaker is possible by extending tender's headset away from the speaker. Use Amron Model 2822-28 headset extension cable (25 foot).
  • Page 29 The Model 2825A has an automatic speaker disconnect relay which disconnects the front panel speaker when using the hand-held microphone. This greatly reduces the background noise during transmissions to the divers. This feature is also functional when using an AMRON headset, and headset extender (Model 2821-28). 5.11.6 TAPE RECORD JACK Isolated audio output to drive an audio tape recorder or VCR.

  • Page 30: Wireless Options

    WIRELESS TENDER OPTION /28A This option is installed in the right-hand section of the Diver Communicator’s front panel. Amron’s Full Duplex Wireless Tender is designed to allow the top-side tender to communicate to divers with hands-free operation. This allows the tender to check equipment and perform other tasks while still maintaining constant contact with the divers.
  • Page 31 Amron’s advanced NOISE REDUCTION FILTER (NRF) incorporates a complex DSP algorithm which filters out background noise while allowing the diver’s speech to be clear and intelligible. Amron NRF automatically captures the frequency spectrum of applied background noise within the audio frequency bandwidth and reduces it without affecting the diver’s speech.

  • Page 32: Maintenance And Troubleshooting

    4. Identify the microphone and headset leads. When using an Amron headset, the microphone is the red banana plug and the headset is the black banana plug.

  • Page 33: General Maintenance

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL 4. Identify the microphone and headset leads. When using an Amron headset, the microphone is the red banana plug and the headset is the black banana plug. 5. Plug the microphone lead into the TENDER HEADSET (black) jack and the headset lead into the DIVER MICROPHONE (red) jack.
  • Page 34  Inspect the front panel gasket for any damage and replace if necessary.  On the communicator - recharge the battery using the Amron 2823-603 Battery Charger.  Perform the 2-Wire and Full Duplex (4-Wire) system checks as described in section 5.2.

  • Page 35: Troubleshooting

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL TROUBLESHOOTING Most problems are usually simple issues that can often be found by careful inspection of the diver communicator, diving umbilical, and diver wiring. The following section will describe the troubleshooting procedure for several common issues. If these sections do not cover your particular issue, it is recommended that the diving umbilical be disconnected from the diver communicator and the check-out procedures in section 5.1 be conducted.
  • Page 36 Drain the speaker if necessary. If these steps do not solve the problem then disconnect the diver umbilical and perform the communicator check out procedure per section 5.1. If the communicator fails the check-out procedure, contact Amron per section 2.2 for further assistance. If the communicator checks out, then the problem is likely in the diver umbilical communication cable.
  • Page 37 If this does not solve the problem and the umbilical cannot be immediately replaced, then operate in 2-Wire mode until a replacement umbilical can be used. Amron strongly recommends the use of the Amron CC1 communication cable. It has been specially designed for clear communications and long service life.
  • Page 38 Open the front panel and inspect as described in section 5.3.3. If that does not resolve the problem then contact Amron per section 2.2 for further assistance. 2820A & 2825A-UM...

  • Page 39: Full Duplex (4-Wire) - What, Why And How

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL FULL DUPLEX (4-WIRE) – WHAT, WHY AND HOW Amron has designed the AMCOM Full Duplex (4-WIRE) mode from the ground up, taking advantage of state-of-the-art electronics technology to provide a superior hard-wire communication experience.

  • Page 40: What Is Full Duplex (4-Wire)

    On the surface, a tender using a headset may get some acoustic feedback via the PANEL SPEAKER. The solution is to put some distance between the tender and the PANEL SPEAKER by using the Amron Model 2822-28 Walk-and-Talk Module accessory. Alternatively, the PANEL SPEAKER can be turned off using the SPEAKER SWITCH located on the front panel.

  • Page 41: Why Full Duplex (4-Wire)

    Amron Diver Communicator uses an independent microphone amplifier for each diver circuit as well as for the tender. This allows Amron Diver Communicators to use the power of common-mode rejection to cancel any coupled noise for each microphone as well as providing less loading of the microphone than in 2-Wire mode.
  • Page 42 To revert back to 2-Wire mode, simply remove black banana plug from DIVER EARPHONE (black) jack and plug it on top of DIVER MICROPHONE (red) plug. Things to keep in mind when using Amron's AMCOM diver communicators: With the AMCOM diver communicators you can mix 2-Wire and Full Duplex (4-Wire) modes of operation.

  • Page 43: Drawings

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL DRAWINGS The following drawings illustrate the electrical and mechanical details of the AMCOM II Diver Communications. The corresponding parts lists for each drawing are detailed in the parts lists section, or are included as part of the drawing.

  • Page 44: Parts Identifier Front Panel Model 2820A

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL PARTS IDENTIFIER FRONT PANEL MODEL 2820A 2820A & 2825A-UM REV 8.0...

  • Page 45: Parts Identifier, Front Panel Model 2825A

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL PARTS IDENTIFIER, FRONT PANEL MODEL 2825A 2820A & 2825A-UM REV 8.0...

  • Page 46: Parts Identifier, Models /24, /24/26Dsp3 & /24/28A Option

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL PARTS IDENTIFIER, MODELS /24, /24/26DSP3 & /24/28A OPTION 2820A & 2825A-UM REV 8.0...

  • Page 47: Parts Lists

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL PARTS LISTS The parts lists include both mechanical and electrical parts. The following information will be useful in interpreting data which is not self-explanatory. REVISIONS The parts lists in this manual are for the current model of diver communicator as of the printing date.

  • Page 48: Amcom Ii Model 2820A

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL AMCOM II MODEL 2820A PART # DESCRIPTION 2832-202-02 PC CARD ASSEMBLY AMCOM II STD 2820-301 AMCOM II CASE ASSEMBLY 2820A-400 FRONT PANEL ASSY WIRED 2820-500 CARD AND BATTERY BOX ASSY 2890-03 BATTERY 6V SPRING TERMINAL 8-32X3/4KTSB SCREW KNURLED THUMB BRASS ¾...

  • Page 49: Amcom Ii Model 2820A/23

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL AMCOM II MODEL 2820A/23 PART # DESCRIPTION 2832-202-02 PC CARD ASSEMBLY AMCOM II STD 2820-301 AMCOM II CASE ASSEMBLY 2820A-400 FRONT PANEL ASSY WIRED 2820-500 CARD AND BATTERY BOX ASSY 2890-04 BATTERY RECHARGE 6V GEL 5AMP...

  • Page 50: Amcom Ii Model 2820A/24

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL AMCOM II MODEL 2820A/24 PART # DESCRIPTION 570-1008-23 PC CARD ASSEMBLY AMCOM II STD 2820-301 AMCOM II CASE ASSEMBLY 2820A-400 FRONT PANEL ASSY WIRED 2824-500B BATTERY BOX-INTERNAL CHARGER 2890-05 BATTERY RECHARGE 12V GEL 7.2 AMP...

  • Page 51: Amcom Ii Model 2825A

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL AMCOM II MODEL 2825A PART # DESCRIPTION 2832-202-01 PC CARD ASSEMBLY AMCOM II DELUXE 2820-301 AMCOM II CASE ASSEMBLY 2825A-400 FRONT PANEL ASSY WIRED 2820-500 CARD AND BATTERY BOX ASSY 2405-28 MICROPHONE PUSH TO TALK...

  • Page 52: Amcom Ii Model 2825A/23

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL AMCOM II MODEL 2825A/23 PART # DESCRIPTION 2832-202-01 PC CARD ASSEMBLY AMCOM II DELUXE 2820-301 AMCOM II CASE ASSEMBLY 2825A-400 FRONT PANEL ASSY WIRED 2820-500 CARD AND BATTERY BOX ASSY 2405-28 MICROPHONE PUSH TO TALK...

  • Page 53: Amcom Ii Model 2825A/24

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL AMCOM II MODEL 2825A/24 PART # DESCRIPTION 570-1008-20 PC CARD ASSEMBLY AMCOM II DELUXE 2820-301 AMCOM II CASE ASSEMBLY 2825A-400 FRONT PANEL ASSY WIRED 2824-500B BATTERY BOX-INTERNAL CHARGER 2405-28 MICROPHONE PUSH TO TALK 2890-05 BATTERY RECHARGE 12V GEL 7.2A...

  • Page 54: Amcom Ii Model 2825A/24/26Dsp3

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL AMCOM II MODEL 2825A/24/26DSP3 PART # DESCRIPTION 570-1008-20-HSU PC CARD ASSEMBLY AMCOM II DELUXE 2820-301 AMCOM II CASE ASSEMBLY 2825A-400 FRONT PANEL ASSY WIRED 2824-500B BATTERY BOX-INTERNAL CHARGER 2405-28 MICROPHONE PUSH TO TALK 2890-05 BATTERY RECHARGE 12V GEL 7.2A...

  • Page 55: Amcom Ii Model 2825A/24/26Dsp3 (Continued)

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL AMCOM II MODEL 2825A/24/26DSP3 (CONTINUED) PART # DESCRIPTION 113-10K-05 POTENTIOMETER; 10K OHM +/-5% 190-0500-15 KNOB; TURN-COUNTING DIAL 8511-30-00 CLIPCORD WHITE STYLE C2A 570-1006-02 DSP3 HSU PROGRAMMED 2836 SHORTY BUSHING.750 HOLE 2820A-25A-UM USER MANUAL FOR ALL 282XA 2820A &...

  • Page 56: Amcom Ii Model 2825A/24/28A

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL AMCOM II MODEL 2825A/24/28A PART # DESCRIPTION 570-1008-20 PC CARD ASSEMBLY AMCOM II DELUXE 2820-301 AMCOM II CASE ASSEMBLY 2825A-400 FRONT PANEL ASSY WIRED 2824-500B BATTERY BOX-INTERNAL CHARGER 2405-28 MICROPHONE PUSH TO TALK 2890-05 BATTERY RECHARGE 12V GEL 7.2A...

  • Page 57: 2820-301 Case Assembly - Amcom Ii

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL 2820-301 CASE ASSEMBLY – AMCOM II 9.10 PART # DESCRIPTION 2820-301 CASE ASSEMBLY 2820-3006 GASKET, LID TO CASE 2820-3031 GASKET, PANEL 9.11 2820A-400M FRONT PANEL ASSEMBLY PART # DESCRIPTION *NOT AVAILABLE FOR SALE...

  • Page 58: 2825A-400M Front Panel Assembly

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL 9.12 2825A-400M FRONT PANEL ASSEMBLY PART # DESCRIPTION *NOT AVAILABLE FOR SALE PANEL FRONT AMCOM II DELUXE PBSWITCH SWITCH PUSH BUTTON SEALED N.O 7580K6 SWITCH TOGGLE SPST 757-3522 SWITCH TOGGLE DPST ON-ON...

  • Page 59: 2824-500B Battery Box Internal Charger

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL 9.13 2824-500B BATTERY BOX INTERNAL CHARGER PART # DESCRIPTION *NOT AVAILABLE FOR SALE BRACKETSUPPORT RAIL *NOT AVAILABLE FOR SALE CHASSIS UNIVERSAL CARD 190-0101-01 POWER SUPPLY PC CARD MODIFIED GEE62F-C0 GROMMET EDGING BLACK...

  • Page 60: Optional Spares

    2820A AND 2825A TWO DIVER COMMUNICATOR USER MANUAL 9.15 OPTIONAL SPARES PART # DESCRIPTION QUAN 570-1008-20 AMPLIFIER CARD ASSEMBLY 570-1008-23 AMPLIFIER CARD ASSEMBLY 570-1008-20-HSU AMPLIFIER CARD ASSEMBLY 190-0101-01 POWER SUPPLY PC CARD MODIFIED 2405-28 MICROPHONE PUSH TO TALK 2890-05 BATTERY 12VDC SLIDE TERM. GEL 2820A &...

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