From: dbartsch2236@hotmail.com
To: sjpearceqld@bigpond.com
Subject: transmission tests
Date: Sat, 27 Oct 2007 18:18:59 -0400
Stephen,
Having first constructed a simple tone generation circuit that produced a 1khz tone that when applied to the "dipping" hydrophone, I removed this signal and instead connected this hydrophone to the output of a stereo at the point that it would have connected to the speaker. The result was not what I had expected, and cranking up the volume did not damage or explode the piezo element! I could hear loud very audible voice or music depending upon the station to which I tuned the stereo receiver.
This find is significant!
If you were to use a hydrophone (One specific to this purpose), one could transmit voice in a cone some sixty degrees wide toward an intended receiver (another submarine), and the responding message could be picked up by the passive sonar array or single hydrophone for listening! Underwater communications of the most simple form is born!
Consider this...you take a portable bullhorn and instead of using the supplied speaker, you apply this to this hydrophone and start talking underwater.
David Bartsch
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