Re: [PSUBS-MAILIST] sonar research

David,

I can try to arrange two boats to perform an operational test of these units in deep salt water.

R/Jay

Respectfully,

Jay K. Jeffries

Andros Is., Bahamas

As scarce as the truth is, the supply has always been in excess of the demand.

-Josh Billings

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of David Bartsch
Sent: Tuesday, February 10, 2009 1:50 AM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST ] sonar research

Jon,

Here are some suggestions and areas I am at a stand still with reguard to your suggested testing:

(1) I agree that deep water testing of this unit is required.
      Frank is in the process of making a compression chamber for testing the HBH-2 hydrophone to ensure that it will indeed go down to the 500' we ask of it without it flooding. As to how far he has reached in this task I can only speculate...enlighten us Frank D. Where are you at with this? Is there anything anyone else can do to aid you in this?
      During the development phase of this hydrophone, it was suggested that as pressure increased, the surface upon which the piezo element was mounted would distort and cause unknown results. The only way I can see testing this would be as you suggest...to send a functional hydrophone down on a submarine designed for this depth of 300' you desire and listen to the results. This test would require but a single amplification channel (preamplifier card and 7 watt amplifier card) as the transmit function is at this point not being tested.
      And finally, now that I brushed this subject, although I am confident this "broadband voice transmitter" or transducer for solids imbedded in a hefty l ayer of two part molding plastic would hold up under simular pressure as the hydrophone, this must also be verified with testing.

(2) As to what if any effect salt water would have on this mode of communication...one name comes to my mind...Jay Jeffries in the Bahamas. I would suggest that once the handset modification is finished and verified to be fully functional on Les's console #2, that we somehow send both console #2 and console #3 down to the Bahamas for some fun in the sun with Jay (If I have some loud swim trunks can I go too?) granted He would be willing to test these for us.

(3) This one I can actually do...Having built three so far, and having messed up in as many ways as I could think of, I feel I would be the best qualified to hopefully help others avoid at least some of my pitfalls that I ran across. I could go back into my old sent e-mails and compile a series of pictures of these consoles at verious stages of construction and provide these along with how-to instructions.

                                                                                            David Bartsch

> Date: Mon, 9 Feb 2009 12:40:44 -0500
> From: jonw@psubs.org
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] sonar research
>
>
> Glad to hear the testing phase is in progress. A couple things that
> come to mind.
>
> 1) Deep water test is necessary. Based upon our "pinger" experiences we
> know that reflections and such can have impact on results. It's
> possible that the ice covering helped or hindered the test. As soon as
> possible, one hydrophone/transmitter set should be lowered to deep water
> (minimum 300 feet) and then tested with the surface unit. This would
> also help with pressure testing the transmitter housing.
>
> 2) Salt water testing. Our pinger tests showed a dramatic decrease in
> performance within salt water as compared to fresh water. We need to
> know the capabilities of the communicator in a salt water environment.
>
> 3) White paper. We could really use two pieces of documentation. The
> first, providing the theory of the design and a walk through of the
> pitfalls that were encountered along the way. The second being a parts
> list and "how-to" so that people can make their own. I have the wiring
> schematic from David which I will be posting as soon as we figure out if
> we want a separate project page for this. >
> Jon
>
>
>
> marki katschor wrote:
> >
> >
> > Hi All, Today we made a trip to a small pond to test the two sonar
> > transmitter units i recived from David Bartsch. We found a ice
> > hole and made one 58 paces from that one. Set up the two units
> > just by lowering the hydrophones and transmitters a foot or two in
> > the ice water, the ice was a foot thick. The hydrophones pick up
> > super sound. The voice transmitting worked well but next test i;m
> > going to mount the underwater parts to a poll so i can point the
> > units at each other for better pickup and transmit. I'm happy,
> > thanks David. Dave-thats $200 plus the four amp kits-$45 ($245 per
> > unit).. I think the next test this week will prove more than 200
> > feet from one ice hole to another. I have been working on my sub
> > at a shop where its warm,, working on the last window #12. The
> > minkota motor thruster swivel thru hulls- cost $100 a set if
> > anyone wants a set. Leslie Katschor
> >
>
>
>
>
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