Do you know any under water wireless device

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1

Hi
My recent project need wireless data transmission under water.
Do you know where can I find the under water wireless modem?

Thanks

2

I may be wrong but I think transmitting underwater requires a very low frequency to work. I’m not too sure but I think thats how the old style submarines used to do it. I may be wrong though.

3

Seen some people do it with xbee… it’s based on the application though…

4

@ HughB,
If i’m not mistaken then the submarine problem is because of the salt in the water. That makes the water conductive and thus lower frequencies are required to minimize the water’s effect…

@ Tzu Hsuan,
Is it salt water or fresh water? :slight_smile:

5

In my project, I would put a wireless node in the river under a bridge.
so it should have water, sand, soil…
I fund a researcher who use the Xbee pro in their under water project.
Please see it below,
http://ace.utsa.edu/morefiles/Matthew_J_Journal1[Gox].pdf

6

“LEGO NXT Underwater Vehicle” this project use Xbee pro 900.
http://www.users.on.net/~bpesic/media.html

I may do some experiments using Xbee pro under water.
If I done i can post here.

thanks.

7

@ errol
i knew there was more to it just wasnt sure what :-[. Totally forgot about salt making water conductive.

8

If you put the device under water, but could bring the antenna above water, it would take away the range problem.

What about ultrasonic? It should be quite possible to have a low speed data comms link using piezo transducers with good range under water.