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Amron Amcom ™ II 2-Diver Standard Rechargeable Portable Communicator DISCONTINUED

SKU: OBS-2820A/23

    Availability: Contact us for availability

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    The 2820A/23 has been replaced to Model Number 2820A-01


    • Single volume control for both divers
    • Both divers can be set up on 4-Wire Mode or 2-Wire Mode or any combination of the two modes
    • Ability to use both dynamic and pre-amplified diver microphones with a unique circuit that detects microphone type and automatically adjusts volume levels
    • The divers' connections consist of cross-talk and separate speaker and microphone inputs
    • Weatherproof panel microphone for greater voice intelligibility
    • Communicator can be left on charge indefinitely without damage to the batteries or communicator (/23 and /24 versions only)
    • Communicator can be operated directly from the charger where AC power is available (/23 and /24 versions only)


    • Audio Power Output 20 Watts per channel
    • Frequency Response 500 Hz to 3 kHz
    • Isolation Transformer Split Bobbin Medical Grade
    • Dimensions 10 in. H x 9 in. W x 14.5 in. L(25.4 cm x 22.9 cm x 36.8 cm)
    • Weight 20.3 lbs (9.2 kg)
    • Power 110/220 VAC 50/60 Hz (automatic sensing), or Internal/External Batteries 12 VDC

    Amcom ™ II 2-Diver Standard Rechargeable Portable Communicator with External Charger - P/N: 2820A/23 Includes:

    Tech Note:

    All communicators will transfer topside noise to the diver when using the radio speaker only. To eliminate background noise and achieve clear communications, use a Push-to-Talk microphone, headset, or a Remote Walk-and-Talk with a headset.

    2 and 3 Year Extended Warranties are available for this product. Please refer to the Attachments tab for further information on the warranty programs.

    Note: Amron reserves the right to change the battery brand at any time without notice.


    The 2820A/23 has been replaced to Model Number 2820A-01

    The Amcom ™ II Series 2820A diver communication radio system is a full featured hard wire, two diver communicator. The 2820A models have a single earphone volume control for diver's volume (down-link) and a single volume control for the tender (up-link).

    All Amcom ™ II Series communicators have Push-to-Talk and separate, isolated inputs for each diver. The Amcom ™ II Series portable communications system delivers 20 watts "voice power"; operating from internal batteries or external 12 VDC power source. Models with the /23 or /24 option can be operated from either a 110/220 VAC, external 12 VDC power source, or an internal 12 VDC battery. All Amcom ™ II Series communicators have the capability of 2-wire and/or 4-wire communication modes. 2-Wire and 4-wire modes can be used simultaneously.

    The Amcom ™ II Series communicator has the ability to work with both dynamic and pre-amplified microphones in either 2-wire or 4-wire modes. The circuit detects the type of microphone that each diver is using then automatically switches from the pre-amp mode to dynamic mode, adjusting the specific diver's gain (volume). The tender's volume is set louder than the diver's volume. This allows the tender to hear the diver in a noisy environment while maintaining the diver's volume at a comfortable level.

    Note: Amron reserves the right to change the battery brand at any time without notice.


    Additional Information

    Search Weight 75
    Brand Amron
    GSA No
    DOD No
    Clearance Item No
    Communication Mode 2-wire/4wire
    Video No

    Product FAQ's

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    • What type of cable do I need to connect my Amron communicator to my Outland video system?
      Amron communicators and Outland Technology’s video systems have a RCA Phono Jack. To connect the two systems together, you will need an audio cable with RCA Plugs on each end.
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    • Can you stack the banana plugs from the diver's communicators cable so you can have two divers on each diver channel?

      Although it may be possible, we strongly discourage such operation. The added workload would cause overheating and stress to the amplifier card. Prolonged use in this condition will eventually cause permanent damage and failure to the amplifier card.

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    • Should I use a GFI when operating my radio off AC power?

      When operating your Amron Diver Communicator on AC, it is critical to use a Ground Fault Circuit Interrupter (GFCI) or isolation transformer for tender and diver safety. Surges and spikes are common on AC lines found on ships, generated locally, or at the end of long extension cable runs and can exceed 1kVolt. Such surges and spikes can cause the fuses, F1 and F2, to blow on the battery charger board and in extreme cases damage the charger circuitry. The battery charger is designed so that such a failure will be isolated and will not cause a safety issue to the tender or divers. It is strongly advised that your Amron Diver Communicator be operated on an AC circuit with a high quality surge arrester or an AC isolation transformer.

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    • What is the input voltage range for the 2823-603 External Battery Charger?
      The 2823-603 can operate over an input voltage range from 90-264 VAC. It operates over an input frequency range from 47-440 Hz.
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    • Why does the speaker on my communicator sound muffled?
      The simplest way to fix this issue is to unplug the red banana plug from the red microphone 5-way binding post on the communicator and rotate it 180 degrees then reinstall it. This should fix your problem. For a more detailed explanation of what happened, please read below. The issue is not with the communicator, it is with the wiring of the umbilical. There is always the potential for wiring the speakers and microphone out of phase, similar to wiring the speakers on a car stereo system. There is an orientation to the banana jacks and they should be wired for proper phasing with the communicator. A banana plug does have an identified ground side marked on the plug. Amron always sets up their umbilicals so that the ground side is located on the left side so the user can consistently plug in their umbilical and avoid phasing issues. If a banana plug is plugged upside down or is wired out of phase, the sound quality will be significantly reduced. If the phasing is out and the orientation of both plugs are the same, then the banana plug wiring should be reversed on “only one plug” to avoid this issue again. It does not matter which plug you choose to reverse the wiring on.
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    • When my battery does not appear to be holding a charge, how do I know if the problem is a bad battery or if the charger is broken?

      To determine whether the problem is with the battery or charger you will need to verify if the charger is properly charging the battery.


      1. Unplug your communicator and turn on the POWER switch. 
      2. Measure the voltage across the yellow PUSH-TO-TALK (PTT) jack and write down this value for future reference. It should be greater than 9 Volts. 
      3. Plug the communicator into an AC source and verify that the AC POWER LED on the front panel turns on. 
      4. Re-measure the voltage across the PTT jack and note it down for future reference. It should be higher than the previous measurement. 
      5. If the AC POWER LED does not light up when the communicator is plugged in, then check fuses F1 and F2 on the charger Printed Circuit Assembly (PCA). 
      6. Allow the communicator to charge overnight. 
      7. Unplug the communicator and re-measure the voltage across the PTT jack. 
        1. If it is the same or less than the voltage you measured previously, then the charger is broken and the communicator needs to be sent in for repairs
        2. If the voltage higher than previous measurement but less than 13.5 Volts, then the battery is bad and needs to be replaced. 
        3. If it is greater than 13.5 Volts but it still appears that the battery is not holding a charge, contact Amron for additional support.
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    • Can I operate my communicator while I’m charging the internal battery?
      Yes, however, the charger will charge the battery at a slower rate as some of the charger power is being used to operate the communicator. For the communicator only, units without options, about 20% of the charger’s power is being used by the communicator but units with HSU (Helium Speech Unscrambler) most of the battery charger energy is going to the communicator and HSU.
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    • How do I install a new microphone in my Amcom II or III Communicator?
      Please refer to the Panel Microphone Installation instructions located in the attachments tab.
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    • Can my Amcom communicator work on 240V / 60Hz?
      Yes, the unit will operate on 240V 50/60Hz.
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    • What is the electrical protection (IP) rating on the AMCOM II 2820A Communicators?
      2820A Portable Series: Case Closed – IP67, Case Opened – IP66.
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