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Hi David,
We have two grown kids and it's too soon for grandkids,
altough my wife may with the last thought.
I would be happy to turn some steel tube if you want to
experiment with that.
In either case my address follows:
Jim Kocourek
1479 S. County Road W
Reedsville, WI 54230
Best Regards,
Jim K
----- Original Message -----
Sent: Tuesday, August 05, 2008 4:35
PM
Subject: RE: [PSUBS-MAILIST]
Convention
Jim,
Have you any young kids that show an
interest in science? perhaps Grandkids? A simple study with this kind of thing
is all it takes to get a young mind asking "what if?"
Want
a working hydrophone to play with? I have one just sitting here following the
in-lake water tests! Give me your address and its on the way as well as
amplifier info. Go ahaed...dive in and listen for
yourself.
David Bartsch
From: kocpnt@tds.net
To: personal_submersibles@psubs.org
Subject:
Re: [PSUBS-MAILIST] Convention
Date: Tue, 5 Aug 2008 08:39:49
-0500
Hi David,
I am located in Wisconsin and would be happy to help if
I can. I must tell you that I have minimal electronic experience.
Best Regards,
Jim K
----- Original Message -----
Sent: Tuesday, August 05, 2008 3:30
AM
Subject: RE: [PSUBS-MAILIST]
Convention
Jim,
The military used hydrophones formed
in a circle. Since sound propogates from a single point of origin, it
expands from this point in an ever enlarging circle. These sound waves would
eventually encounter this hydrophone array and strike specific hydrophones
in a set given order as it continues to pass thru this array. The military
having almost endless resources had the ability to determine the bearing to
the point of this sounds origin by this sequence of detections and hence
where it came from.
Dealing with Psubs, we have limited space,
limited funds, and the need for exact contact bearing of detection is not
critical.
I too am at a loss as to the lack of bearing accuracy
now being shown from these later units. The initial "dolphin ear" hydrophone
had almost no side detection capability and the level of detection increased
as the source became closer to ninty degrees from the piezo elements
mounting surface. It was bi-dirrection as back side detections were also
part of its beam pattern.
I need to go back and redesign this unit
so as to regain its dirrectionality (Is there such a word?)
Where
is your location, and do you feel like participating in this road of
discovery? Your input, testing, and evaluations would be a great asset to us
all.
Do you have a working sub or one under construction? Are
there lakes, ponds, or other bodies of water nearby for
testing?
David Bartsch
From: kocpnt@tds.net
To: personal_submersibles@psubs.org
Subject:
Re: [PSUBS-MAILIST] Convention
Date: Mon, 4 Aug 2008 21:02:13
-0500
Hi David,
I think that the underwater hydrophone testing went
well. The results were not as good as hoped for from a directional
standpoint. I brought up that if we used some of the same components and
made the tube from steel or some othe dense material, I think that
directionality will be improved. This is just a guess. Perhaps the opposite
is also true, you could use the similar tube and some insulation to soften
the reaction of the outside diameter of the tube and allow the acrylic front
take a higher percentage of the feedback. I feel as if one or the other of
these approaches are worth testing for positive directional
results.
Best Regards,
Jim K
----- Original Message -----
Sent: Monday, August 04, 2008 5:45
PM
Subject: RE: [PSUBS-MAILIST]
Convention
Jim,
It is my understanding that the
weather played against us when it came to the underwater passive
hydrophone and pinger presentations. Of what you were able to participate
in, what are your thoughts and reactions on this
presentation?
David Bartsch
From: kocpnt@tds.net
To:
personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST]
Convention
Date: Mon, 4 Aug 2008 05:29:08 -0500
Hi All,
Having just returned from the comvention, I
would like to thank Jon & Ray for all the effort to put together a
fine meeting. I learned a lot and met some more great people. Also thanks
to all presenters, who added to my personal knowlwdge base.
Thanks again,
Jim K
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