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To all, To best inform everyone as to the dirrection or method of underwater comunications our group will eventually persue, allow me to explain the required compatable equiptment needed to cross comunicate between two submurged submarines using our system. Our system does not use radio transmissions at all. Active (talk or transmit) uses voice audible sound transmissions into the water via a transducer and is covering 10hz to 18khz broadband. Likewise, the hydrophone for the returning response will also use the full range of human hearing. In short, this feature will be a secondary purpose to the passive hydrophone listening device our group is now developing. A surface "radio" system will still be required of like or compatable equipment with the rest of the group. Think of this system as a possible backup should radio communication within the medium of water fail to rendure the needed results. I believe in redundancy or fail safe backups. > Date: Thu, 25 Oct 2007 12:51:41 -0700 > From: psubs2001@yahoo.com > Subject: RE: [PSUBS-MAILIST] RFC - Radio communications for submersible dive operations > To: personal_submersibles@psubs.org > > Hi, > > Interestingly as a community we have all come to > understand that underwater communications are > important. Important enough that there are three > distinct projects to design a reasonable cost system. > The project leaders are: > > Al Secor > David Bartsch > PSUBS Safety Committee > > At this point I just wanted the teams to be aware who > is out there. > > Perhaps when each are done we will have three seperate > designs available. Hopefully compatible. Or perhaps > the teams will synergize their ideas into one design. > Who knows at this time. > > I do stress that they need to be all compatible. What > are the basic specs that need to be spelled out to > make sure they are all designed to be compatible? > Frequency? Side bands? What? Is there a standard > somewhere we can all use? > > Regards, > Ray > > > --- "Smyth, Alec" <Alec.Smyth@compuware.com> wrote: > > > Way to go Al! If you can come up with a > > build-it-yourself design or even > > a buy-it-from-Al design, that would be a huge > > contribution given the > > prices for the off the shelf comms. I'm going to > > pass your email to a > > friend who just possibly could help with the > > transducer issue. > > > > Thanks, > > > > Alec > > > > > > The contents of this e-mail are intended for the > > named addressee only. It contains information that > > may be confidential. Unless you are the named > > addressee or an authorized designee, you may not > > copy or use it, or disclose it to anyone else. If > > you received it in error please notify us > > immediately and then destroy it. > > > > From: owner-personal_submersibles@psubs.org > > [mailto:owner-personal_submersibles@psubs.org] On > > Behalf Of Al Secor > > Sent: Wednesday, October 24, 2007 8:25 PM > > To: personal_submersibles@psubs.org > > Subject: Re: [PSUBS-MAILIST] RFC - Radio > > communications for submersible > > dive operations > > > > Hi Guys, > > > > I have been working on a design for U/W comm for a > > couple of years now > > and have a design that works but needs refining. My > > design operates on > > Double Side Band at 32.768Khz. I chose this > > frequency to be compatible > > with the OTS Buddy Phone on my Aga full face mask. > > Now the problem and why I am not ready to release > > the design.... > > > > The biggest problem is securing an omnidirectional > > transducer with full > > electrical specs that doesn't cost an arm & a leg or > > requires buying > > 1000+ quantities. The one I'm using now I purchased > > from OTS for $200 > > but don't have specs on it so my driver circuit is > > not optimum. I would > > also like to modify my design to be true SSB (Single > > Side > > Band) with a > > supressed carrier for better power efficieny. I > > have an idea on how to > > do this but won't get a chance to work on it until > > the end of December. > > > > We will also need to settle on a frequency since the > > transducers have a > > pretty narrow bandwidth. I obviously vote for > > 32.768 Khz USB. > > > > I'll try to keep interested parties posted on my > > progress. > > > > Al Secor - WA3PWX > > > > ----- Original Message ----- > > From: "Ray Keefer" <psubs2001@yahoo.com> > > To: <personal_submersibles@psubs.org> > > Sent: Wednesday, October 24, 2007 2:08 PM > > Subject: RE: [PSUBS-MAILIST] RFC - Radio > > communications for submersible > > dive operations > > > > > > > Hi, > > > > > > Just so everyone knows. The safety committee is > > looking into > > > possibilities for underwater communications since > > radios have > > > limitations underwater. We have yet to come to any > > conclusions for a > > > reasonable cost recommendation. > > > > > > Currently we are looking at scratch built, kit > > built, or off the shelf > > > > > alternatives for sub-to-sub and surface-to-sub > > communications. If you > > > have any ideas or recommendations we can look at > > by all means speak > > > up. > > > > > > Our tenative schedule is to have something decided > > for use for the > > > 2009 PSUBS Convention. Which means soon enough > > that owners can > > > retrofit their subs in time. > > > > > > Other projects the safety committe is working on > > are a standardized > > > buoy and more fomalized dive operations plan. Both > > are going to be > > > critical when operating in USCG waters at the 2008 > > PSUBS Convention. > > > > > > Just thought you would like a glimpse of some of > > the behind the scenes > > > > > work. Details will be shared when appropiate. > > > > > > Regards, > > > Ray > > > > > > --- Emile van Essen <emile@airesearch.nl> wrote: > > > > > >> James, > > >> > > >> Sorry for the language. One click further was > > English . > > >> But the price was noted there. 1100,- Euro for > > one unit. Maybe > > >> somewhere else for 2 units a better price. > > >> > > >> Team Nemo and the C-quester from U-boatworx uses > > this sets; Sound > > >> quality is perfect but I don't know how the > > transducer is built in. > > >> > > >> Both OTS and ocean reef can work on 32.768 KHz. > > So you can chat with > > > > >> other psubbers ;-) > > >> > > >> Regards, Emile > > >> > > >> -----Oorspronkelijk bericht----- > > >> Van: owner-personal_submersibles@psubs.org > > >> [mailto:owner-personal_submersibles@psubs.org] > > >> Namens James Frankland > > >> Verzonden: woensdag 24 oktober 2007 15:01 > > >> Aan: personal_submersibles@psubs.org > > >> Onderwerp: RE: [PSUBS-MAILIST] RFC - Radio > > communications for > > >> submersible dive operations > > >> > > >> Hi Emile > > >> > > >> That ocean reef system look really good. > > >> > > >> My Dutch is a bit rusty, so Ive found the page in > > English here! > > >> > > >> Thanks > > >> James > > >> > > >> http://www.oceanreefgroup.com/ > > >> > > >> > > >> > > >> ----- Original Message ----- > > >> From: Emile van Essen > > [mailto:emile@airesearch.nl] > > >> To: personal_submersibles@psubs.org > > >> Sent: Wed, 24 Oct 2007 12:49:56 +0200 > > >> Subject: RE: [PSUBS-MAILIST] RFC - Radio > > communications for > > >> submersible dive operations > > >> > > >> James, > > >> > > >> A CB does not work in salt water. The more > > electrical conductive, the > > > > >> worse. > > >> > > >> It is good to have a CB or VHF for surface and a > > acoustic for > > >> submerged. > > >> > > >> The Ocean Reef surface station is a option for > > sub to sub or sub to > > >> surface. > > >> > > > > > > www.divequipment.nl/producten.asp?categorie_id=15&product_id=325## > > >> > > >> > > >> or some more expensive > > >> http://www.oceantechnologysystems.com > > >> > > >> The trancducer may have a depth limit. > > >> > > >> Emile > > >> > > >> -----Oorspronkelijk bericht----- > > >> Van: owner-personal_submersibles@psubs.org > > > === message truncated === > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! 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