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Al, Looks like we are going to need your help here...don't give up yet! David Bartsch > From: wreckdiver@frontiernet.net > To: personal_submersibles@psubs.org > Subject: RE: [PSUBS-MAILIST] Suggestion for UW comms > Date: Fri, 30 Oct 2009 11:08:35 -0400 > > > Interesting to see this subject cycle around every now and again. A year or > so ago I mentioned I have a design and circuit boards for an SSB UQC based > on a cave radio that I was going to modify to drive an ultrasonic > transducer. Nobody seemed interested at the time so I dropped development > of it at the time. The design was for 32.750 khz so it would be compatible > with most scuba based comms like OTS, Divelink, and Orcatron. The problem > was (and still is) finding an affordable transducer designed for that > frequency. I contacted most of the major transducer mfgs and they all > wanted BIG BUCKS (read $$$$) for their off the shelf transducers. > > I have enough transducers of my own to build 1 radio pair but to build > additional ones, I would need a source for additional transducers. Even if > I can obtain transducers from one of the comm. Companies such as OTS, they > won't be "CHEAP"...we're probably talking $200+ for EACH transducer and you > would need 2, 1 for the sub and one for the surface radio. That means you > have $400 - $500 invested before you even begin the electronics. > Again...NOT CHEAP!!! I personally don't think there is such a thing as a > cheap, reliable, underwater communications solution except maybe for Jens' > suggestion of a 2-wire telephone link to the surface but then again, like > Jay mentioned...that would not necessarily be reliable due to problems with > wire breakage / maintenance. > > Again, at the time I advertised my radio solution, no one seemed interested > so I stopped development on it. (I also had other commitments and problems > that prevented me from continuing work on it at the time). If PSUBS would > like me to continue development on it, I can start the project back up this > winter. > > I also have bought several of those pingers off of Ebay. I actually > contacted the seller and he was willing to sell be all I wanted at $10 a > piece. At the time, I was hoping to be able to scavenge the transducer from > them but the electronics and transducer are totally potted in epoxy and no > matter how carefully I tried to dissect it, I didn't have any luck. BTW, > these are designed to be run off a 9v battery and are activated when it > comes in contact with water across 2 exposed screws. > > With regards to a standardized connector...the OTS transducer uses a 2 pin > AMP modular waterproof connector. I can get the part number later. The > only problem is it is plastic instead of metal. I believe there's a 4 pin > version of this also but I suspect David's hydrophone could be modified to > work with a single transducer for both transmit and receive. > > Al - WA3PWX > > > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > The personal submersibles mailing list complies with the US Federal > CAN-SPAM Act of 2003. Your email 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 email message to: > removeme-personal_submersibles@psubs.org > > Removal of your email 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 > ************************************************************************ > ************************************************************************ > ************************************************************************ > New Windows 7: Find the right PC for you. Learn more. |