From: "Joseph Perkel" <joeperkel@hotmail.com>
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Hydrophone systems
Date: Fri, 11 May 2007 11:57:43 +0000
David,
Free is always the "right price"! I cannot be there but, look forward to
seeing the results.
Let me ask you this,... what can a homebuilder expect in terms of narrowing
the bearings to prop sounds to say... within 5 deg? Is that a reasonable
expectation?
Joe
From: "David Bartsch" <dbartsch2236@hotmail.com>
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Hydrophone systems
Date: Thu, 10 May 2007 23:32:25 -0400
>Joseph Perkel,
> Nice hydrophones...my plans are free and will be available at the
>upcomming convention!
>
>
>>From: "Joseph Perkel" <joeperkel@hotmail.com>
>>Reply-To: personal_submersibles@psubs.org
>>To: personal_submersibles@psubs.org
>>Subject: [PSUBS-MAILIST] Hydrophone systems
>>Date: Thu, 10 May 2007 18:44:20 +0000
>>
>>
>>Peter and others,
>>
>>When I was considering a war-boat replica, I had gone as far a
>>acquiring plans for a homemade directional hydrophone.
>>http://www.digitalmarketingusa.com/hydrophone.html
>>
>>There are a number of commercial, albeit expensive units that are
>>off the shelf such as
>>http://www.sonotronics.com/html/products/receivers/mantrak.html
>>
>>The idea being that one could mount such a device atop a short
>>shaft through a simple rotating thru hull. One could have a fixed
>>compass rose on the inside with the bow of course aligned
>>@ 360 deg, in order for the operator to determine and call out
>>bearings.
>>
>>When I was diving, I was fairly certain within.... I would guess a
>>90 deg swath of the direction of props to try to keep myself from
>>being blended. This is
with human ears so I am quite sure these
>>units will get that down to the degree.
>>
>>If you really want to get fancy, there are software programs
>>available that will determine range based upon density and sound
>>wave propagation. This could be run on a Panasonic "Toughbook".
>>
>>Joe
>>
>>
>>
>>
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>
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