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Wow, Sounds like you are really making progress! And I thought that taking a constant tone piezo buzzer apart and installing a momentary push button switch in series with it was going places. At least morse code or a sonar transponder beacon could be produced from it. If placed on an object of interest, you could relocate it a later date. I am still going to persue straight analog voice as any broadband passive sonar system will be able to hear without the need for translations. David Bartsch > Date: Wed, 30 Jan 2008 19:27:55 +0100 > Subject: RE: [PSUBS-MAILIST] Sub Heater Options > From: laland@artematrix.org > To: personal_submersibles@psubs.org > > David > > Off course, I would be very happy to exchange any ideas, thoughts, and > solutions with you. > > Like you said, there's a lot of problems related to underwater > communication, and both transmitting and receiving has it's own problems > that need solving (unless we just go shopping). > > It appears we both were capable of generating a musical tone under water, > and have somebody else listening to it from a said distance. > > The thing is, I'm still working with this "single tone", and will do so > until I have my own, homemade system for underwater telegraphy. > > (A digital, ROM based "emergency message generator" would be part of that > system.) > > I need to improve the signal/noise ratio in the receiver circuitry, and > hope to do this with adjustable bandpass filtering. > > And finally, when my ultrasound tone generator design is working and > properly tested using a simple piezo-electric disk submerged in a local > pond... > > then I need to think of a 10 - 20 watts output amplifier, perfectly > matched and driving a high quality sonar transducer. > > Done that, I'll see if I can master two (distinctively different) tones. > > And if so, I think it should be possible to connect up a pair of slow > (early 80's) data modems. One in the submarine, the other up above. > > And since communication with digital data can be combined with it's own > error checking, so to speak, I believe this would be worth trying prior to > going analog. > > After all this, maybe I would have gained enough confidence (and skill?) > to try prototyping a voice-modulated utrasound transceiver with proper > analog sound processing and all. > > regards, > Jens Laland, > > PS.: I need to send you some schematics, but my hand-drawn sketches will > have to be scanned at the public library, since my own computer is down at > the moment. I'll try to get them off to you tomorrow. > > ** > ** Underwater communications...This is an area worth investigating. Our group > ** has so far been able to send a simple musical tone 500 feet and pick this > ** up well...vocal communications is still under investigations as we had > ** problems in this mode. > ** I have come up with a suitable transmitter but require more testing. I > ** would love to work towards a universal underwater voice communications > ** system that all psubbers can use...and am willing to share all testing > ** info with you. My e-mail is dbartsch2236@hotmail.com and will devulge our > ** findings. Let us see what if anything, we can come up with. > ** > ** > David > ** Bartsch> > ** Date: > ** Mon, > ** 28 > ** Jan > ** 2008 > ** 20:05:26 > ** +0100> > ** Subject: > ** Re: > ** [PSUBS-MAILIST] > ** Sub > ** Heater > ** Options> > ** From: > ** laland@artematrix.org> > ** To: > ** personal_submersibles@psubs.org> > ** > > ** Øystein> > ** > > ** Nice > ** to > ** meet > ** another > ** norwegian > ** - > ** for > ** me, > ** too... > ** and > ** you > ** asked > ** me > ** do > ** I > ** have> > ** a > ** project > ** going?> > ** > > ** No, > ** I > ** have > ** not > ** started > ** welding > ** on > ** anything > ** yet, > ** but > ** I'm > ** working > ** on > ** it. > ** In> > ** the > ** meantime, > ** I > ** have > ** started > ** building > ** the > ** various > ** sub-systems > ** that > ** is> > ** needed > ** within > ** a > ** submarine.> > ** > > ** Right > ** now > ** I > ** am > ** assembling > ** (ready > ** for > ** testing) > ** an > ** all > ** brass > ** "fore > ** n'aft> > ** trim > ** indicator" > ** inspired > ** by > ** the > ** ones > ** used > ** in > ** german > ** submarines. > ** My > ** next> > ** project > ** (partly > ** started) > ** is > ** to > ** make > ** a > ** functional > ** replica > ** (in > ** brass) > ** of > ** the> > ** german > ** Papenberg > ** precision > ** depth > ** gauge > ** (used > ** down > ** to > ** about > ** approx. > ** 20> > ** meters).> > ** > > ** And > ** whenever > ** it's > ** too > ** cold > ** in > ** the > ** "mechanical > ** dept", > ** I > ** just > ** withdraw> > ** inside > ** and > ** pick > ** up > ** some > ** experimental > ** work > ** on > ** a > ** simple > ** underwater> > ** communication > ** system.> > ** > > ** Jens > ** Laland> > ** Bryne, > ** Norway> > ** > > ** ** > ** Jens> > ** **> > ** ** > ** Hyggelig > ** å > ** treffe > ** en > ** annen > ** nordmann > ** her > ** inne. > ** Har > ** du > ** no > ** prosjekt > ** på > ** gang > ** ?> > ** **> > ** **> > ** ** > ** Øystein > ** Skarholm> > ** **> > ** > > ** > > ** > > ** > > ** ************************************************************************> > ** ************************************************************************> > ** ************************************************************************> > ** The > ** personal > ** submersibles > ** mailing > ** list > ** complies > ** with > ** the > ** US > ** Federal> > ** CAN-SPAM > ** Act > ** of > ** 2003. > ** Your > ** address > ** appears > ** in > ** our > ** database> > ** because > ** either > ** you, > ** or > ** someone > ** you > ** know, > ** requested > ** you > ** receive > ** messages> > ** from > ** our > ** organization.> > ** > > ** If > ** you > ** want > ** to > ** be > ** removed > ** from > ** this > ** mailing > ** list > ** simply > ** click > ** on > ** the> > ** link > ** below > ** or > ** send > ** a > ** blank > ** message > ** to:> > ** removeme-personal_submersibles@psubs.org> > ** > > ** Removal > ** of > ** your > ** address > ** from > ** this > ** mailing > ** list > ** occurs > ** by > ** an> > ** automated > ** process > ** and > ** should > ** be > ** complete > ** within > ** five > ** minutes > ** of> > ** our > ** server > ** receiving > ** your > ** request.> > ** > > ** PSUBS.ORG> > ** PO > ** Box > ** 53> > ** Weare, > ** NH > ** 03281> > ** 603-529-1100> > ** ************************************************************************> > ** ************************************************************************> > ** ************************************************************************> > ** _________________________________________________________________ > ** Connect and share in new ways with Windows Live. > ** > http://www.windowslive.com/share.html?ocid=TXT_TAGHM_Wave2_sharelife_012008 > > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > The personal submersibles mailing list complies with the US Federal > CAN-SPAM Act of 2003. 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