I am looking for a modem to work under water. The modem should be low
cost and preferably battery powered.
When I say under water I mean that a diver/vehicle will be working
underwater and some sensors on him need to transmit serial (RS232)
data to a computer on the surface. This modem should be able to
transmit that data through the water without using a wire.
The distance underwater to the surface is very small - about 25 meters
max. Think swimming pool sized areas.
I know of underwater modems that are for use at sea, but those are
over the top in size, price for a swimming pool sized operation.
Thanks
Would something like this UVM1000 work?
http://www.link-quest.com/html/models1.htm
jbf777-ga
GA Researcher
Again, size matters... I had seen the Benthos units you refer too (had
already searched for underwater acoustic modem and variants). It is
too big and heavy.
The datasonics unit (e.g. see
http://www.mkservices.demon.co.uk/mks/telesonar.htm) is capable of
operation to 2000 meters - this is an overkill for our application.
I need something small for use in a swimming pool (about 100th the
distance of what those units can transmit), and I was hoping for
something 10th the size.
I tried making contact with this company on the offchance they may
have something for underwater use even though I cannot find anything
on their site regarding this. So far (4 days) they have made no
response so I am posting a response.
The concept of a typical radio working underwater is extremely
unlikely though, and is something I investigated first... Most
underwater modems are accoustic are because they work at an incredibly
low frequency that will travel through water, but requires high power
transmission. Normal wireless radios like the ones you would work a
very very small distance underwater so would be impractical, even for
this type of application.
I'd love for the company (or someone) to tell me otherwise, but so far
they've made no reply.
I have found these products.
http://www.romor.ns.ca/products/underwateracoustics.htm
http://www.e-insite.net/ednmag/index.asp?layout=article&articleid=CA60930
If any of these products are the ones you require, I will post it as
an answer and collect the fee.
Just let me know. :)
This looks to come close to your needs:
http://www.radio-tech.co.uk/
and click on "Radio Modems":
"RTcom-RS232-Compact- L or -S Modem:
New for April 2003, this compact, fully submersible, Ip68++ encased
modem is ideal for applications demanding a highly rugged design at
and affordable price"
The unit is small, self-contained. I contacted the company, and they
quoted a price of 100 Euros, which is roughly $100.
The only down side is the range, which appears to be 10M. However,
you may want to contact the company about your needs to see if they
can accomodate you.
If this turns out to be successful, let me know, and I will post this
as an answer.
Good luck in your efforts.
I did see those when I searched. They all looked to big for a diver
to have. I guess I should have said size matters too.
#If you have any other info about this subject , Please add it free.#
Author
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