Radio communication under water.

Discussion in 'Wireless & RF Design' started by jtmk711, Dec 26, 2009.

  1. jtmk711

    Thread Starter New Member

    Jul 24, 2009
    3
    0
    I'm toying with controlling a shallow water (100 ft max depth) ROV with radio comunications. Any recommendations as to freq, range, signal strength, etc? Thanks for any help in advance.
     
  2. steveb

    Senior Member

    Jul 3, 2008
    2,433
    469
    This is very difficult. Some details can be found here.

    http://www.qsl.net/vk5br/UwaterComms.htm

    Personally, I'd use sound, rather than radio, for underwater communications. If you are dealing with short distances, you can consider blue light as the carrier. You're looking at some challenges with any of the three methods.
     
  3. Papabravo

    Expert

    Feb 24, 2006
    10,154
    1,795
    The navy has experimented with ELF, extremely low frequency communication with submarines. Unfortunately the antenna for such a transmitter covered several square miles and it required large amounts of power to attain suitable signal levels. Don't think it is practical for your application.
     
  4. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287

    If it's fresh water, you have a chance. If it's saltwater, the only choice is ELF.

    eric
     
  5. jtmk711

    Thread Starter New Member

    Jul 24, 2009
    3
    0
    Thanks to all for the input and the link. This project is one of those things that I want to do just for the challenge. Since I live in the midwest, fresh water is definitely where my journey will start. Thanks again.
     
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