Amron Amcom II 2-Diver DSP3 Portable Helium Speech Unscrambler

SKU: 1453

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Amron Amcom II 2-Diver DSP3 Portable Helium Speech Unscrambler

SKU: 1453

The AMCOM™ II 2825A-12 Two-Diver Portable Communicator with DSP3 Helium Speech Unscrambler with Outdoor AC Power Module and International Locking Power Cord features hard-wired, two-diver communications for both air and mixed gas diving. 

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The AMCOM™ II 2825A-12 Two-Diver Portable Communicator with DSP3 Helium Speech Unscrambler with Outdoor AC Power Module and International Locking Power Cord features hard-wired, two-diver communications for both air and mixed gas diving. The HSU module utilizes the latest in technological advancements.  The core of our design incorporates a state-of-the-art digital signal processor to correct raw helium speech to clear, intelligible voice. The improved Treble Boost offers greater control over the amount of gain added to the high frequency portion of the diver’s microphone. The Depth Control can be finely-tuned using a multi-turn potentiometer, providing the tender with better speech quality. The Noise Reduction Filter (NRF) uses a complex Digital Signal Processor algorithm to capture the background noise and reduce it without affecting the divers’ speech.


This innovative concept allows our HSU to be the first unscrambler to use both frequency and time domain technologies for real-time audio processing. This state-of-the-art digital design accommodates a multitude of functions ranging from the correction of the diver’s raw helium speech to normal intelligible voice levels, advanced treble boost, and complex noise reduction filters (NRF).


Our communicator features separate channels and volume controls for up to two divers and the tender so that uplink and downlink paths can be customized for varying equipment configurations and individual comfort levels.


NEWLY DESIGNED ENHANCEMENTS:


• High Audio Fidelity
Ultra-low noise circuit combined with noise suppression circuitry produces crystal clear speech. Automatic gain adjustment will guard audio signal from distortion, enhance speaker protection and audio quality. Increases band width 47%.


• Extended Battery Operation Time
Audio amplifier card deploys the state-of-the-art Class-D digital audio power amplifier. Has very low power dissipation, produces less heat, and extends battery life up to 32%.


• Flexible Gain Settings
The audio amplifier card has adjustable gain settings to accommodate different communication applications and environments.


• Ultra-Low Electromagnetic Interference (EMI)
EMI is achieved through spread-spectrum and de-phase control techniques providing for optimum integration with diving systems.


• Outdoor Rated AC Power Module
Weather resistant, IP65 rated AC power entry module accommodates country specific AC power cords.


• Country Specific V-Lock AC Power Cord
At time of order, simply choose the IP54 rated Locking AC power cord you need.


  • Helium Speech Unscrambler (HSU) is conveniently installed in the option panel of this portable communicator incorporates a state-of-the-art digital signal processor to correct raw helium speech to clear, intelligible voice. The Depth Control can be finely-tuned using a multi-turn potentiometer providing the tender with better speech quality.

  • Real-time audio processing uses both frequency and time domain technologies for optimized performance over a wide range of depths and background noise.

  • Improved Treble Boost Control feature allows for optimum frequency enhancement and improved intelligible speech from the diver’s voice.

  • The Noise Reduction Filter (NRF) uses a complex Digital Signal Processor algorithm to capture the background noise and reduce it without affecting the diver’s speech.  Noise reduction level can be reduced by up to 17 dB

  • Separate channels and volume controls for each diver and tender to accommodate individual earphone and microphone adjustments, equipment variations and individual comfort levels.

  • Divers’ umbilicals can be set to 4-wire mode (full duplex) or 2-wire mode (push-to-talk) or any combination of the two modes for any diver.

  • Ability to use both dynamic and pre-amplified diver microphones with a unique circuit that detects microphone type and automatically adjusts volume levels.

  • Weatherproof push-to-talk microphone for better voice intelligibility topside. For optimum clarity, see Tech Note (below) for other recommended equipment.

  • Internal charger allows for simultaneous charging and operation of the unit while protecting the rechargeable battery from being over-charged.  Automatically supplies power to the audio amplifier when AC power is disconnected to allow for continued operation.


  • 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 Volts Minimum - 16 Volts Maximum)

  • 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: 31 hours

  • 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: 17.25 Lbs. (7.82 Kg)