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Al, I am working on a fast and cheap simple to operate underwater communications setup that uses acoustics and will go side by side with the passive sonar system Dan will soon install aboard "persistance". He says that the two of you get together periodically and I wonder if I could ask that you dissect this system with him and see if it could be useful. As I said before it is as simple as they come and should have a broadband range of 500' or perhaps a little farther. Two boats if so equipt could possably talk back and forth while submerged. David Bartsch > Date: Thu, 10 Apr 2008 17:24:34 +0000 > From: wreckdiver@frontiernet.net > To: personal_submersibles@psubs.org; empiricus@telus.net > Subject: Re: [PSUBS-MAILIST] radio link > > > If you want something that is tried and true and not half assed then > you need to go ultrasonic as Jay mentioned earlier. The following > companies offer off the shelf solutions for underwater to surface comms: > > www.ots.com > > www.divelink.com > > www.oceanreefgroup.com > > There are a few others but these guys are the major players with OTS > probably being the top dog (I speaking strictly non commercial, non > military). > > Ir you want reliable (mostly) and non-Mickey-mouse comm, this is the > way to go. It's going to be somewhat pricey but hey, if we can afford > side scan sonar and all other types of expensive "toys" then a > reliable form of surface communication should be affordable. > > Now, on a side note, I am working on a cheaper alternative using the > same basic design as the companies listed above. My major stumbling > block is an affordable transducer which I am still looking for and > have not yet found. Most of the ones I've located so far cost as > much, if not more than the costs of the entire units of the above > companies. OTS acts very suspicious when I try to purchase a > "replacement transducer"..... > > I've mentioned in several previous posts that I am working on this and > pretty much get silence in return so I have to wonder how many people > are actually willing to step up and "pet the pony" and actually > purchase something like this. I couldn't even get a response as to > what people view as an acceptable price to invest in something like > this would be. Right now, my prototype is spoken for and is being > built for Dan H. for use on Persistance. If I don't get any feedback, > this will likely be the only pair of units I will build. > > Al Secor - Electrical Engineer for IBM, Ham Radio operator callsign WA3PWX > > > Quoting Rick and Marcia <empiricus@telus.net>: > > > Thanks, Carsten - I'll be operating in seawater and am looking for something > > that will work from scuba depths up to the surface. > > > > I'd like to avoid wire if I can for obvious reasons. As it will be > > temporary during trials, I'm willing to go the wire route if Ihave to. > > > > Should I use wire, I'll need to know if there are any issues around length > > of wire or power requirements. I know that salt and submerging the antenna > > during transmission are not good. > > > > Rick > > > > > > > > ----- Original Message ----- > > From: <MerlinSub@t-online.de> > > To: <personal_submersibles@psubs.org> > > Sent: Thursday, April 10, 2008 8:56 AM > > Subject: RE: [PSUBS-MAILIST] radio link > > > > > > We have good results with CB-radios (27 Mhz) as Sub-to-sub or > > sub-to-surface(boat) > > communication even with antennas underwater on short distance up to 6- 8 > > Meter in freshwater. > > > > regards Carsten > > > > > > <ag@desertstar.com> schrieb: > >> > >> All, > >> > >> FWIW, there is a company in the UK which claims to have made some > >> advances in underwater radio comms. There literature is short > >> on technical detail, but they have done some demos and are funded. > >> http://www.wirelessfibre.co.uk/ > >> > >> I am not aware of any one else offering production underwater rf systems > >> commercially. > >> > >> Their data sheet for their S1510 claims 100 bit/sec, which can be done > >> pretty easily acoustically. The don't specify range. Their broadband > >> modem claims 100 Kbit/sec but at a range of only 5m. > >> > >> I would still go with a hydroacoustic system unless broadband acoustic > >> noise was a huge factor. > >> > >> -a > >> > >> > >> > Rick, > >> > > >> > Yes it will, you just have to be careful of submerging the antenna while > >> > transmitting which will result in blowing your transmitter. The tourist > >> > sub > >> > I was considering being the maintenance manager for used a similar > >> > arrangement but didn't dive deeper than 50 ft. Anything trailing from a > >> > sub > >> > is at great risk of fouling especially in thrusters/prop. Ultrasound > >> > (UQC) > >> > is the best way to go. > >> > > >> > R/Jay > >> > > >> > > >> > > >> > > >> > > >> > Respectfully, > >> > > >> > Jay K. Jeffries > >> > > >> > Andros Is., Bahamas > >> > > >> > Vive vt vivas > >> > - Live that you may live > >> > > >> > > >> > > >> > From: owner-personal_submersibles@psubs.org > >> > [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Rick and > >> > Marcia > >> > Sent: Thursday, April 10, 2008 01:25 > >> > To: personal_submersibles@psubs.org > >> > Subject: Re: [PSUBS-MAILIST] radio link > >> > > >> > > >> > > >> > Hi, Jay - so if I have a VHF onboard and run an antenna cable to a > > float > >> > (with the antenna attached above water) that would work? > >> > > >> > > >> > > >> > Rick > >> > > >> > ----- Original Message ----- > >> > > >> > From: Jay K. Jeffries <mailto:bottomgun@mindspring.com> > >> > > >> > To: personal_submersibles@psubs.org > >> > > >> > Sent: Friday, April 04, 2008 3:48 AM > >> > > >> > Subject: RE: [PSUBS-MAILIST] radio link > >> > > >> > > >> > > >> > The antenna length for VLF and energy requirements for the radio will > > far > >> > surpass that of a VHF radio. > >> > > >> > R/Jay > >> > > >> > > >> > > >> > > >> > > >> > Respectfully, > >> > > >> > Jay K. Jeffries > >> > > >> > Andros Is., Bahamas > >> > > >> > Vive vt vivas > >> > - Live that you may live > >> > > >> > > >> > > >> > From: owner-personal_submersibles@psubs.org > >> > [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Rick and > >> > Marcia > >> > Sent: Friday, April 04, 2008 07:29 > >> > To: personal_submersibles@psubs.org > >> > Subject: Re: [PSUBS-MAILIST] radio link > >> > > >> > > >> > > >> > Hi, Max - sorry for the late response, I've been overseas. > >> > > >> > > >> > > >> > Thanks for the great info. Now to decide whether VLF would be easier to > >> > implement than a hard-wire to the float. Guess the ham guys will fill > > me > >> > in > >> > there. I know that VLF carries less information - or is that ULF . . . > >> > > >> > > >> > > >> > Cheers and thanks again :-) > >> > > >> > > >> > > >> > Rick > >> > > >> > > >> > > >> > > >> > > >> > ----- Original Message ----- > >> > > >> > From: Max Elliott <mailto:max.elliott@gmail.com> > >> > > >> > To: personal_submersibles@psubs.org > >> > > >> > Sent: Saturday, March 08, 2008 7:04 PM > >> > > >> > Subject: Re: [PSUBS-MAILIST] radio link > >> > > >> > > >> > > >> > Rick, > >> > > >> > My HAM friends tell me you are looking for a Very Low Frequency (VLF > > 3KHz > >> > - > >> > 30KHz) set up like the military uses, and the good news is that you can > >> > DIY > >> > one fairly easily. (So they said.). I believe that this frequency gets > >> > some 20 meters of penetration, but that's just a ballpark rumor I have. > >> > > >> > I haven't built one, but I'm connected to some hams in Napa and > > Washington > >> > state and would be happy to get you some contact information if you're > >> > interested in talking to them. They will have the math at their > >> > fingertips > >> > to tell you what your power and range requirements will work out to. > >> > They'd > >> > also know how to avoid stepping on any legal and military toes. > >> > > >> > http://www.radio-flier.com/diy_corner.html - you'll find VLF for an > >> > example > >> > receiver. I would advise google/shopping around for more information. > >> > > >> > I'd bet the HAMming community would be happy to help someone building a > >> > PSUB. It just seems like the hard-science, unique kind of projects they > >> > enjoy. > >> > > >> > --Max Elliott > >> > > >> > > >> > > >> > On Sat, Mar 8, 2008 at 6:29 PM, Rick and Marcia <empiricus@telus.net> > >> > wrote: > >> > > >> > Has anyone figured out how to establish a radio/video link with a > > surface > >> > vessel? > >> > > >> > > >> > > >> > My somewhat non-tech mind is thinking of a hard-wired connection with > > the > >> > antenna attached to a diver's float. > >> > > >> > > >> > > >> > How far from the transmitter can you run an antenna? > >> > > >> > > >> > > >> > I have offers from the Canadian Coast Guard to act as standby divers but > >> > I'd > >> > like to give them a play-by-play on her maiden voyage. > >> > > >> > > >> > > >> > > >> > > >> > Rick Lucertini > >> > > >> > Vancouver, Canada > >> > > >> > > >> > > >> > > >> > >> > >> > >> > >> ************************************************************************ > >> ************************************************************************ > >> ************************************************************************ > >> 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 > >> ************************************************************************ > >> ************************************************************************ > >> ************************************************************************ > >> > >> > > > > > > > > > > ************************************************************************ > > ************************************************************************ > > ************************************************************************ > > 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 > > ************************************************************************ > > ************************************************************************ > > ************************************************************************ > > > > > > > > > > > > > > > > ************************************************************************ > > ************************************************************************ > > ************************************************************************ > > 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 > > ************************************************************************ > > ************************************************************************ > > ************************************************************************ > > > > > > > > Al Secor > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > 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 > ************************************************************************ > ************************************************************************ > ************************************************************************ > Pack up or back up–use SkyDrive to transfer files or keep extra copies. Learn how. |