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Brian, A special thanks go out to you for having tested this for the first time in salt water! These results were not unexpected as it was understood that anything that produced water borne noises would be picked up along with these communications. This is the primary shortfall for this simple system. It may find a general purpose aboard submarines as a casual short range boat to boat or to and from support vessels or even just divers. At the time this project was initiated back in 2007, Dan H. informed me that the farthest he could communicate while submerged was...only 2 feet! I think we have succeeded in extending this range just a bit and done this very cost effectively. As more work is done aboard submarines with this system being worked thru its paces, a fuller picture of the full capabilities and limitations of this most basic of communications systems will become clearer. Thank you again on your testing efforts and I appreciate your honest reporting as to its outcome. David Bartsch > From: brian@subatlantic.com > To: personal_submersibles@psubs.org > Subject: RE: [PSUBS-MAILIST] in-water testing session completed > Date: Fri, 16 Apr 2010 17:37:42 -0400 > > Hello All > I have done some testing with the new broadband underwater communications > Built by David Bartsch and it's been very promising I set up Pier to pier > 200 feet apart at a depth of 15 feet in Boston Harbor it was High tide water > temp 45 degrees and there was a lot of floating particulates in the water, > and was able to communicate unit to unit it's not the best test due to the > sounds around the harbor or maybe it was ? they hear everything from the > Detroit generator on the ship to the jet drive water taxi, but still could > make out the other unit and carry on a conversation, I feel that out away > from the noise of the harbor these units should perform nicely I hope to get > the small boats out and go test in the coming weeks in deeper water. > Thanks to David and his enthusiasm and knowledge and creative thinking > > > Brian V. Ryder > brian@subatlantic.com > > CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, is > for the sole use of the intended recipient(s) and may contain confidential > and privileged information or otherwise be protected by law. Any > unauthorized review, use, disclosure or distribution is prohibited. If you > are not the intended recipient, please contact the sender by reply e-mail > and destroy all copies of the original message. > > -----Original Message----- > From: owner-personal_submersibles@psubs.org > [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Jon Wallace > Sent: Monday, April 12, 2010 11:33 AM > To: personal_submersibles@psubs.org > Subject: Re: [PSUBS-MAILIST] in-water testing session completed > > > David, > > Thanks for your research and work on this project. > > We still need open water testing in depths approaching PSUB capability > since the shallow water likely set up many reflections that either > helped or hindered the range. I would concentrate further testing > efforts at finding someone who can perform deep water (150-300 feet) > testing in open water. I have no idea if the results will be better or > worse, but it seems like it is data we should have for completeness. > The 420 feet horizontal distance you reached exceeds the range of K-sub > operational limits, so knowing how the unit operates at depth and with > an equal or greater area of width (300 foot cube?) is important. I'm > not sure 35 feet of salt-water at the convention is an ideal test bed, > however it will certainly be interesting to compare salt-water results > with this unit to those I found with the pinger up in Maine. > > Jon > > > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > The personal submersibles mailing list complies with the US Federal > CAN-SPAM Act of 2003. 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