Hi John,
        Something I've been thinking about. Instead of rf why not acoustic.

        I'm sure someone has tried something like this ?

        Would pulses sent on say a 40khz carrier update the subs
controls frequently enough ? I'm sure you would get better range than
rf. There would probably be interference problems to overcome with
multiple transmitters (fish finders ?). And how much range is really
necessary before the sub goes out of sight.

        I finally found what looks like a reasonable supplier of
acoustic transducers.

        http://www.hexamite.com/he123tr.htm

        Does anyone know of other similar suppliers.

        I havn't ordered from them as I haven't yet had time to try
some experiments.

At 2:35 PM -0700 7/9/01, O'Reilly John E NORC wrote:
>Has anyone ever tried transmitting from above water to underwater and vice
>versa?  I am thinking of using 2m amateur transceivers on either end, and
>I'm wondering what kind of range I can get with a couple of watts.  Also, if
>I put one half of the antenna (either ground or radiator) in the water, will
>that make a difference?
>
>TIA
>John
>
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