Research Edition Modem

Our research edition modems are designed to bridge the gap between developing applications using a simulator and high-end commercial deployments. Due to its low cost, these modems provide an easier entry to the world of underwater communications to any underwater technology enthusiasts.

Key Features

  • Up to 15 kbps data rate*.
  • Ranging functionality with 0.1 m precision.
  • Doppler resilience of ±4 knots or better.
  • Support for coherent and incoherent communication schemes.
  • Support for arbitrary signal transmission as well as recording (passband, baseband).
  • Support for user defined communication schemes using UnetStack.

* Depending on channel conditions and reliability requirements.

Standalone Configuration

A modem in the standalone configuration (SC) operates on external power source such as a battery (for underwater deployments) or a power supply (for deployments from the water surface).



Feature Details
Modulation (software defined) PSK-OFDM, FH-BFSK
FEC (Forward Error Correction) - LDPC (up to 1/6 rate code)
- JANUS (1/2 rate convolution code)
JANUS support Yes, subject to operating frequency band
Carrier frequency 24 kHz
Bandwidth 12 kHz (20 - 32 kHz)
Source level 175 dB re 1 µPa @ 1 m rms (nominal)


Feature Details
Framework UnetStack
User Interface Interactive web UI
Software Interfaces Java, Groovy, Python, C, JavaScript, Julia, Matlab


Feature Details
Power source 22 - 28 VDC (24 VDC recommended)
Power consumption < 4 W (receive mode, nominal)
< 25 W (transmit mode, avg.)
External interface Ethernet (10/100 Mbps)
On-board storage 32 GB


Feature Details
Hull material Acrylic
Operating depth 100 m
Dimensions ⌀ 130 ✕ 290 mm
Operating temperature 0 to 40 °C