Joe,
For efficient transmission, the signal is translated in frequency (still
audible but unintelligible) to maximize range and single side-band is used to
conserve energy. Anything else will have difficulties of one form or
another. Opening a basic sonar acoustic text will document this, you can’t
get around basic physics.
R/Jay
Jay K. Jeffries
Andros Is., Bahamas
A skimmer afloat is but a submarine, so poorly built it will not
plunge…
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Joseph
Perkel
Sent: Friday, November 14, 2008 4:55 PM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] sound transducers
David,
Not having any field experiences and out of curiosity, this brings to mind a
question regarding underwater voice transmission in general.
I've seen voice comm between Alvin and Atlantis, Calypso and the saucers,
habitats,...etc.
Is this voice comm severely scrambled (distorted by the seawater), and then
reprocessed by the receiving equipment?
Or, put another way, if I swim between divers with voice comm equipment,
could I hear the conversation like I do prop noises?
Joe
From: dbartsch2236@hotmail.com
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] sound transducers
Date: Fri, 14 Nov 2008 15:36:04 -0500
To all:
The transducer for solids from which can be made the broadband
voice transmitters are available on e-bay under "underwater speaker"
at this time. These are selling for $26.95 but shipping is being provided. This
is not a bad price if you were concidering delving into this area of study.
With a singing machine that is battery operated, a voice
transmitter can be made from the use of this. (It still needs to be imbedded in
molding plastic to survive deep depths.) And you will still need a means of
hearing the return responce.
It sure would be great to talk back and forth between two
submerged submarines or to your support boat without having to surface first.
David Bartsch
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