RE: [PSUBS-MAILIST] performance

["Jay K. Jeffries" <bottomgun@mindspring.com>]

David,

Those objectives sound very doable.  Years ago, I was party to an experiment that used a 200 Watt underwater speaker to transmit clear voice.  They were able to transmit relatively clear voice with no frequency shifting or SSB across the Charles River in Boston in front of MIT (~600 yards).  This is a body of water that had very little background noise when the experiment was made in the winter.  No biologics (the croaker fish and snapping shrimp will be a big impediment in saltwater) and saltwater issues were to be found in this environment to degrade the signal.

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 David Bartsch
Sent: Saturday, November 15, 2008 2:43 AM
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] performance

 

To All:
 
  As Jay has pointed out, the performance of this system will not in any way rival more professional set ups or those of military grade. It is being designed for short range (500' or less) broadband voice communications intended for the weekend sport submariner.
  In that Jay works on acoustics in the Bahamas for the military, I will not question his knowledge in this field as He is far more in the know than am I.
  The results of our in-water testing in Michigan this Spring will be shared with the group for open discussion and comments.
 
                                                                                                                                         David Bartsch