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Amron 2820A Instruction 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. Copyright© 2013 Amron International, Inc.
Instruction Manual
For
Amron International, Inc.
Model 2820A& 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

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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© 2013 Amron International, Inc.

  • Page 2: Table Of Contents

        ELECTRICAL Specifications ...................... 1     Mechanical SPECIFICATIONS ....................2     Drawing Front Panel Controls Model 2820A ................3     Drawing Front Panel Controls Model 2825A ................4 2.  LIMITED WARRANTY AND SERVICE POLICY .................. 5      Limited Warranty ......................... 5  ...
  • Page 3     9.16 2824-500B Battery Box Internal Charger.................. 60     9.17 2823-603 External Charger Assembly ..................61     9.18 28xx-FS-01 Field Spares Kit for 2820A, 2825A ................ 62     9.19 Optional Spares ........................62 2820A-25A-UM REV 3.0...

  • Page 4: Introduction And Specifications

    The 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 5: Mechanical Specifications

    Height ......................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 ..................

  • Page 6: Drawing Front Panel Controls Model 2820A

    MODEL 2820A-25A USER MANUAL AMCOM II MODEL 2820A DIVER COMMUNICATOR The Model 2820A AMCOM II is a full featured, hardwire diver communicator. The 2820A features a single earphone volume control for the divers (downlink) and a volume control for the tender (uplink).

  • Page 7: Drawing Front Panel Controls Model 2825A

    MODEL 2820A-25A USER MANUAL AMCOM II MODEL 2825A DIVER COMMUNICATOR The Model 2825A AMCOM II is a deluxe hardwire diver communicator. The 2820A features individual earphone volume controls for each diver (downlink) as well as a volume control for the tender (uplink).

  • Page 8: 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 9: Options And Accessories

    It requires the divers are wired in 4-Wire mode. This options is available on the 2825A only. ACCESSORIES Amron produces a series of accessories designed to operate with the entire line of AMCOM communicators. 3.2.1 Amron Heavy-Duty Headset - Model 2401-28 - The Model 2401-28 is a heavy-duty headset with boom microphone.
  • Page 10 MODEL 2820A-25A USER MANUAL 3.2.5 Amron Remote Push-to-Talk Module - Model 2821-28 - 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.

  • Page 11: Controls And Connections

    MODEL 2820A-25A USER MANUAL 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. We also recommend reading the FULL DUPLEX description located in the Operation Section of this manual, for an explanation of advantages and "How to Implement"...

  • Page 12: Tender Connections

    2822-28.. DIVER CONTROLS 4.3.1 Diver Volume Model 2820A – Controls both divers 1 & 2 earphone volumes. 4.3.2 MICROPHONE Volume Model 2825A (Divers 1 & 2) - Controls amplification of diver’s microphone signal, therefore control diver’s volume to tender and to all divers.

  • Page 13: Other Connections

    WARNING! The EXTERNAL BATTERY input can be used to recharge the 2820A & 2825A rechargeable sealed lead acid battery. It is strongly advised to use the provided Amron External Charger, Model 2823-603, to charge or operate the communicator.

  • Page 14: Option Controls Wireless Tender /28A Option

    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 15 MODEL 2820A-25A USER MANUAL 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.

  • Page 16: Drawing 2-Wire Connections

    MODEL 2820A-25A USER MANUAL DRAWING 2-WIRE CONNECTIONS 2820A-25A-UM REV 3.0...

  • Page 17: Drawing, Full Duplex (4-Wire) Connections

    MODEL 2820A-25A USER MANUAL DRAWING, FULL DUPLEX (4-WIRE) CONNECTIONS 2820A-25A-UM REV 3.0...

  • Page 18: Drawing, Operator Connections, P-T-T. Microphone

    MODEL 2820A-25A USER MANUAL 4.10 DRAWING, OPERATOR CONNECTIONS, P-T-T. MICROPHONE 2820A-25A-UM REV 3.0...

  • Page 19: Drawing, Operator Connections, Headset

    MODEL 2820A-25A USER MANUAL 4.11 DRAWING, OPERATOR CONNECTIONS, HEADSET 2820A-25A-UM REV 3.0...

  • Page 20: Installation And Operation

    AC lines found onboard ships, from local generators, or at the end of a long extension lines. These spikes can exceed 1kV! Such spikes can be high enough to cause the input fuses on the Amron Model 2823-603 Battery Charger to blow and, in extreme cases, actually damage the charger circuitry.

  • Page 21: Battery Condition

    MODEL 2820A-25A USER MANUAL Operating time for the rechargeable 12V battery 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.

  • Page 22: Battery Installation:/24 Ac Powered Units

    MODES OF OPERATION The Model 2820A and 2825A have the capability of 2-wire and/or Full Duplex (4 wire) communication modes. 2-Wire and Full Duplex can be used simultaneously (divers on Full Duplex, tender on 2-wire).

  • Page 23: Volume Controls - 2-Wire

    Tender Microphone (input). Turn speaker off to avoid acoustic feedback. Operation with speaker is possible by extending tenders headset away from the speaker. Use Amron Model 2822-28 headset extension cable (25-ft). Up to three divers can be “stacked” onto a single diver channel. Connect the diver’s microphones in parallel by stacking the banana plugs on the microphone jack and do the same with the diver’s earphone plugs on the earphone jack.

  • Page 24: Other Diver Controls - (2-Wire)

    MODEL 2820A-25A USER MANUAL  Tender Microphone Volume: Tender talks while depressing PTT ‘All Divers Switch’, divers determine a comfortable listening level, having the tender adjust as needed. Diver 1  Diver 1 Earphone Volume: Tender talks while depressing Diver 1 PTT Switch, diver 1 determines a comfortable listening level while having the tender adjust as needed.

  • Page 25: Other Diver Controls (4-Wire Mode)

    This can be avoided by turning his volume down (Diver to Tender Model 2825A), which cuts off his microphone, yet will enable him to monitor the diver/tender conversation. On the Model 2820A you can disconnect his microphone circuit which will disable his microphone.
  • Page 26 The jacks on the front panel are pin jacks; mating plugs are available from Amron or any electronic supply store. It is recommended the internal batteries be removed from the radio to prevent overcharging or charging of non-rechargeable batteries.

  • Page 27: Wireless Options

    1,1,1,1,0,0,0,1 (1 is ON). In order to change the channel of operation, it is required to apply changes to both units (master and remote). Amron recommends that the channel be changed by a trained technician. Additionally, 2829-11 Wireless Headset and Transceiver Kits can be purchased for use with the Amcom as standby “listen only”...
  • Page 28 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 29: Maintenance And Troubleshooting

    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. Plug the microphone lead into the TENDER MICROPHONE (red) jack and the headset lead into the TENDER HEADSET (black) jack.

  • Page 30: General Maintenance

    MODEL 2820A-25A USER MANUAL 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. Plug the microphone lead into the TENDER HEADSET (black) jack and the headset lead into the DIVER MICROPHONE (red) jack.

  • Page 31: Troubleshooting

     Inspect the case lid O-ring for any damage and replace if necessary.  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.
  • Page 32 MODEL 2820A-25A USER MANUAL 6.4.1 Connection Issues Most diver communicator problems are caused by bad connections. Making good connections will result in years of good communications. For longer life, all connections should be soldered and copper wire must be tinned. It is strongly suggested that dual banana plugs be used topside to provide convenient and secure connections.
  • Page 33 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 34 180 degrees before reconnecting. 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 35 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-25A-UM...

  • Page 36: Full Duplex (4-Wire) - What, Why And How

    MODEL 2820A-25A 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. Full Duplex (4-Wire) mode has the following advantages: ...

  • Page 37: 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 38: 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 39 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 40: Drawings And Schematics

    MODEL 2820A-25A USER MANUAL DRAWINGS AND SCHEMATICS 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 41: Schematic 2820A And 2820A/23

    MODEL 2820A-25A USER MANUAL SCHEMATIC 2820A AND 2820A/23 2820A-25A-UM REV 3.0...

  • Page 42: Schematic 2820A/24

    MODEL 2820A-25A USER MANUAL SCHEMATIC 2820A/24 2820A-25A-UM REV 3.0...

  • Page 43: Schematic 2825A And 2825A/23

    MODEL 2820A-25A USER MANUAL SCHEMATIC 2825A AND 2825A/23 2820A-25A-UM REV 3.0...

  • Page 44: Schematic 2825A/24

    MODEL 2820A-25A USER MANUAL SCHEMATIC 2825A/24 2820A-25A-UM REV 3.0...

  • Page 45: Schematic Option /26Dsp2

    MODEL 2820A-25 5 A USER MAN NUAL SCHEMA ATIC OPTION /26DSP2 2820A-25 5A-UM EV 3.0...

  • Page 46: Schematic Option 2828-100A

    MODEL 2820A-25A USER MANUAL SCHEMATIC OPTION 2828-100A 2820A-25A-UM REV 3.0...

  • Page 47: Parts Identifier Front Panel Model 2820A

    MODEL 2820A-25A USER MANUAL PARTS IDENTIFIER FRONT PANEL MODEL 2820A 2820A-25A-UM REV 3.0...

  • Page 48: Parts Identifier, Front Panel Model 2825A

    MODEL 2820A-25A USER MANUAL PARTS IDENTIFIER, FRONT PANEL MODEL 2825A 2820A-25A-UM REV 3.0...

  • Page 49: Parts Identifier, Models /24, 224/26Dsp2 & /24/28A Option

    EL 2820A-25 5A USER MAN NUAL PARTS ID DENTIFIER, M M ODELS /24 , 224/26DSP2 2 & /24/28A O OPTION 2820A-25 5A-UM EV 3.0...

  • Page 50: Parts Lists

    MODEL 2820A-25A 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 51: Amcom Ii Model 2820A

    MODEL 2820A-25A 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 52: Amcom Ii Model 2820A/23

    MODEL 2820A-25A 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 53: Amcom Ii Model 2820A/24

    MODEL 2820A-25A USER MANUAL AMCOM II MODEL 2820A/24 PART # DESCRIPTION 2832-202-02 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 8-32X3/4KTSB...

  • Page 54: Amcom Ii Model 2825A

    MODEL 2820A-25A 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 2890-03...

  • Page 55: Amcom Ii Model 2825A/23

    MODEL 2820A-25A 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 2890-04...

  • Page 56: Amcom Ii Model 2825A/24

    MODEL 2820A-25A USER MANUAL AMCOM II MODEL 2825A/24 PART # DESCRIPTION 2832-202-02 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: Amcom Ii Model 2825A/24/26Dsp2

    MODEL 2820A-25A USER MANUAL AMCOM II MODEL 2825A/24/26DSP2 PART # DESCRIPTION 2832-202-01 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 58: Amcomm Ii Model 2825A/24/26Dsp2 (Continued)

    MODEL 2820A-25A USER MANUAL AMCOMM II MODEL 2825A/24/26DSP2 (CONTINUED) PART # DESCRIPTION MRA112-A-RO SWITCH ROTARY SP2-12 POS BLACK LEDBLUE-3MM LED BLUE 3MM PANEL MOUNT INCL 8511-30-00 CLIPCORD WHITE STYLE C2A 2826-DSP2-200 PC CARD ASSEMBLY UNSCRAMBLER 2836 SHORTY BUSHING.750 HOLE 2820A-25A-UM...

  • Page 59: Amcom Ii Model 2825A/23/28A

    MODEL 2820A-25A USER MANUAL AMCOM II MODEL 2825A/23/28A PART # DESCRIPTION 2832-202-01 PC CARD ASSEMBLY AMCOM II DELUXE 2820-301 AMCOM II CASE ASSEMBLY 2820A-400 FRONT PANEL ASSY WIRED 2820-500 CARD AND BATTERY BOX ASSY 2405-28 MICROPHONE PUSH TO TALK 2890-04...

  • Page 60: Amcom Ii Model 2825A/24/28A

    MODEL 2820A-25A USER MANUAL 9.10 AMCOM II MODEL 2825A/24/28A PART # DESCRIPTION 2832-202-01 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 61: Amcom Ii Model 2825A/24/28A (Continued)

    MODEL 2820A-25A USER MANUAL 9.11 AMCOM II MODEL 2825A/24/28A (CONTINUED) PART # DESCRIPTION TAT-1/8 HEAT SHRINK TUBING 1/8IN BLACK 43025-0800 RECEPTACLE 8PIN MICRO-FIT 43030-0007 CONTACT3.0mm FEMALE SOCKET 39-01-2040 RECEPTACLE 4PIN MINI-FIT 39-00-0039 TERMINAL FEMALE CRIMP MINI-FIT 8511-30-00 CLIP CORD WHITE STYLE C2A...

  • Page 62: 2825A-400M Front Panel Assembly

    MODEL 2820A-25A USER MANUAL 9.14 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 1498-102 JACK, BANANA RED...

  • Page 63: 2820-500 Battery Box

    MODEL 2820A-25A USER MANUAL 9.15 2820-500 BATTERY BOX PART # DESCRIPTION *NOT AVAILABLE FOR SALE BATTERY BOX QUICK CLIP STYLE *NOT AVAILABLE FOR SALE CHASSIS UNIVERSAL CARD *NOT AVAILABLE FOR SALE BRACKETSUPPORT RAIL 528-1017 BUSHING STRAIN RELIEF NYLON GEE62F-C0 GROMMET EDGING BLACK...

  • Page 64: 2823-603 External Charger Assembly

    MODEL 2820A-25A USER MANUAL 9.17 2823-603 EXTERNAL CHARGER ASSEMBLY PART # DESCRIPTION 2823-6003 CHARGER CHASSIS ASSEMBLY *NOT AVAILABLE FOR SALE COVER MODEL 2823-603 CHARGER LEDGREEN LED GREEN BRITE LEDHOLDER-BLK.25 MOUNTING CLIP FOR 5MM LED 530-105-0772-1 PLUG TIP RED 530-105-0773-1 PLUG TIP BLACK...

  • Page 65: 28Xx-Fs-01 Field Spares Kit For 2820A, 2825A

    MODEL 2820A-25A USER MANUAL 9.18 28XX-FS-01 FIELD SPARES KIT FOR 2820A, 2825A QUAN PART # DESCRIPTION 7580K6 SWITCH TOGGLE SPS 757-3522 SWITCH TOGGLE DPST ON-ON PBSWITCH SWITCH PUSH BUTTON SEALED N.O 8-32X3/4KTSB SCREW KNURLED THUMB BRASS ¾ P16NP-10K POTENTIOMETER 10K OHM W/KNOB...

This manual is also suitable for:

2825a

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