"Bob Bob" wrote in message..
Also this

http://www.grantsystems.com/pdf/beeman.pdf

Looks like a system at 150Mhz.

Maybe use a 2M txcvr, a shortened antenna and a packet TNC! Lots of
these can be bought second hand very cheaply.

I assume you are licensed to use amateur equipment?

Hi,

(This is reply to both of your messages, along with a reply to others in
this thread as well.)

Apologies for not getting back to this thread until now. I had something
come up that kept me busy all weekend, and it looks like it will continue to
do so until early next week. :/

I did read all the replies though and all were very helpful. That link you
gave for the PDF will be very helpful as well. I've only had time to
briefly skim over it, but look forward to reading it in detail as I'm not
familiar with propagation through water at all.

The laser idea is pretty cool. (Wonder if IR would work at all, have to
look that up later.) From googling, found some other folks that put
together some homebrew robotic projects and had various levels of success
using DTMF. They were using generators/decoders just for simple commands,
but got an idea in my head brewing on how to turn sequences into characters
(with even some rudimentary CRC), and not requiring any computer coding at
all.

As for a license, unfornutely I don't have one (yet). I do have experience
with commercial and military communications though (mainly SHF, tactical and
fixed SATCOM, LOS/Troposcatter microwave, etc) on both the radio side
(converters, synths, amps, filters, antennas, ect) and data side (muxes,
modems, ect). Planning, when time avails, to go to a local ham radio
meeting and getting involved with the hobby.

Cheers!
-Eric