Hi David, Many thanks for the comments. Regards, Hugh
From:
owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org]
On Behalf Of David Bartsch
Sent: 31 August 2008 17:05
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Hydrophones
Hugh,
One more note as to how well your "dolphin ear"
performs...Peter Madson while aboard "Kraka" used a simular unit
attached (I think He used tape) to the inside of one of his forward viewports
and was able to hear a large yacht start its engines whle His boat was
submerged. A more detailed explaination as to how well it performed would be
best comming from this man. Shielding was an area of concern to him...
Peter, have you used this device in any further tests?
David Bartsch
From: hc.fulton@gmail.com
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Hydrophones
Date: Sun, 31 Aug 2008 10:01:27 +1200
David,
Yes would like to get a hydrophone. Count me in.
I got a dolphin ear but it is a bit questionable. How
would you rate its performance
Hugh
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of David
Bartsch
Sent: 30 August 2008 13:14
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] Hydrophones
Frank,
I will in the weeks ahead produce the single hydrophone intended for
installation aboard your boat. This is being done so that you could mount this
device early with the use of the proper thru-hull fitting. It can be placed
within a ballast tank and will hear thru this as long as water is present on
both sides. This will not create additional drag if installed in this or
likewise manner. I will set up a small process whereby many can be produced at
the same time...So....
Does anyone else want a preproduced hydrophone for installation aboard
other submarines or for perhaps testing? Perhaps the how-to-instructions so
that you could build your own?
I used an all electronics preamp kit and all electronics 7watt amplifier
kit and these worked great together allthough other electronics could provide
equally good results. Go to allelectronics.com for ordering info. The preamp
was less than $10.00 with the 7watt amplifier close to $15.00. All that is left
is a small 12vdc battery and a small project box to fit it all in withy the
panel controls and on/off switch.
If you want to take this plunge, here is a great chance to dive in.
David Bartsch
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