> 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?
>

I build R/C model subs. Here in the UK we typically use 40MHz radio
equipment (sorry not sure what power output). Typical results using PCM
(digital coding) is 8-10 feet in chlorinated (sp?) water, probably about
double this in fresh water and virtually nothing in salt water! All this is
with a shallow angle from the transmitter to the sub. Things like pipes and
other metal objects can have a big impact on how well it works so I guess
that things are marginal...

Hope this helps

Andy

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