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RF communication through salt water

Former Member

Hi

 

I'm working on a project where I need to transmit RF signals through salt water. The distance in water will be max. 5m (16ft). I was thinking going for a ATmega build with the RF433Mhz modules of something, but don't know if that will work in saltwater. I have tried to do some reasearch on this subject but couldn't find much. Does anyone know some good research on this or can suggest other build it would be much appreciated.

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  • What bandwidth does your signal need?

    It is much easier to propagate low frequencies - so choose the lowest feasible frequency.

    Frequencies in the 3KHz-30KHz range penetrate about 20m.

    Frequencies in 3-300 Hz range can penetrate hundreds of meters.

    I did some work at about 15 Hz that had no trouble over short distances, but you don't get much data rate at that frequency.

    You might investigate using sonar - I have used 5 MHz sonar transducers.

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  • What bandwidth does your signal need?

    It is much easier to propagate low frequencies - so choose the lowest feasible frequency.

    Frequencies in the 3KHz-30KHz range penetrate about 20m.

    Frequencies in 3-300 Hz range can penetrate hundreds of meters.

    I did some work at about 15 Hz that had no trouble over short distances, but you don't get much data rate at that frequency.

    You might investigate using sonar - I have used 5 MHz sonar transducers.

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