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RE: [PSUBS-MAILIST] Hydrophones
Doug,
The
pinger is included in the slides and is easy to construct. Be advised it
is a 3.2Khz audio pinger and does not conform to ABS standards. We also
had no luck with directionality using the hydrophones as currently designed,
however Lynn Darnell is looking at this issue. From the surface, it was
fairly easy to home-in on it using a grid type search pattern since it's easy to
hear when you are getting closer to it. In fresh water, the pinger and
hydrophone combination worked very well. In salt-water it was quite a bit
less effective, just as Jay Jeffries had suspected it would be. In the
testing we did in salt-water at the convention, the hydrophones were much more
sensitive to passing motor boat traffic than they were in fresh water. At
one point, the noise from a motor boat was so loud that it was difficult to hear
the pinger.
The
attractiveness of the home-built models is their very inexpensive fabrication
costs, about $10 for a hydrophone depending upon how much the wiring costs you,
and $20 for the pinger (only because we used a $12 Radio Shack buzzer as the
acoustic transmitter).
I'm
going to have to split up the slide show into multiple files because it is HUGE
as is. If that's not feasible, I'll just create CD's and ship them out to
people.
I'm
glad to see interest in this. As I've said from the beginning, these units
should be considered prototypes that can stand LOTS of improvements from smarter
people out there, than me. Have fun with the existing models and feel free
to make them better.
Jon
Good, I look forward to the
plans. Do you guys have a pinger too? --Doug