Jim,
Although I did spend eight years aboard a ballistic missile submarine, I too lack serious electronic skills. Do not allow this lack of know how to hinder you...I have learned so much just tinkering with this stuff!
I am close to finishing an underwater communication console that should it work as planned (and all looks promising) should allow for two way voice communications between two submerged submarines. The effective range is unkown at this time, but 1500' looks like an initial range for this set. It is simular in its workings as the distress pinger electronics.
To easily "talk" from the sub up to its support boat to share what is seen and felt I feel would only inhance the submarining experience.
Information while in a distressed condition is vital so as to aid a stricken boat and its crew.
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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