I'm cofude also. In dive training, and in all the related pubs on the
subject I could find, it's commonly stated that sound travels much more
efficiently and for longer distances in H2O...Why do you say that the
effective distance would be reduced in a sonar ap? Also, the sonar buoys we
used to make had small amounts of drive for the transmitters and not much
amp gain for the receivers. They recorded sounds from many miles away..

> Yes it would. Only it would better if the 40kHz would not be exactly
> 40kHz, but slightly tuned to match the transmitter best.
> Driving 12V pk-pk
> square wave into one of those will probably cover up to 20 meters of
> distance under good conditions (or 3-4 meters when used as a sonar).
>
> Peter
>
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