SAM-1

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The simple acoustic modem (SAM) is ideal for underwater data transmission at low to moderate speeds and over distances up to approx. 1000m depending on modem version and conditions. The robust and reliable technology will operate in multi-path intensive harbor basins, shallow waters, and reefs as well as in the open ocean environment. In contrast to high-speed acoustic modems, the SAM devices are much smaller, consume less power, are inexpensive, and due to their particular method of operation can be more reliable for slower data transmissions in difficult environments. A very energy efficient transmission with minimal energy put into the water makes the transmissions unobtrusive and reduces the probability of detection(LPD).

Typical Uses

  • Sensor data transmission incl. pressure, temperature, salinity, chemical
  • Underwater equipment remote control
  • Autonomous or unmanned under water vehicle status & control
  • Text message exchange for manned submersibles
  • Communication with marine mammal based devices
  • SOF and intelligence applications requiring transmission efficiency and LPD

Features

  • Very small size 40mm D x 135mm L
  • Low receive mode power consumption 21 mA @ 9V – 16V
  • Bit rates from 5 to 150 bits/sec sufficient for many applications
  • Robust performance in open as well as shallow / high multi-path waters
  • Very efficient data transmission with low probability of detection
  • Very simple operation: Connect to a serial data port and go
  • Cost Effective

Hooking it up

Data exchange is transparent (i.e. serial data is directly transmitted acoustically) then received on the other end and converted back to serial data format. Data can be exchanged between two or more SAM devices at underwater locations, or between underwater SAM and a SAM lowered by cable from a vessel at the surface.

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NOTE: All information contained within this article is pure opinion. Although this article is intended to help people, it may contain faulty or misleading information. This article is not to be considered professional opinion or advice, and is in no way a replacement for reading all safety/instructional documentation. Always remember to protect yourself when handling/using hazardous materials, as well as test new techniques before using them on projects/work intended to be handed in or used.

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