|
Jon and all: The idea of investigating underwater communications came about as the need to communicate from a submerged submarine became clear while already researching our passive sonar hydrophone. I believe Dan commented to me that the farthest he could communicate while underway was a mere two feet. This simple system we knew would have limitations and some can never be overcome simply by how this system was designed to work. With this said, lets learn as a group as to how better to design a system that would better accommodate all subbers in the way of cost and performance. The system as now designed could find a use aboard submarines that would operate in fresh and relatively shallow waters. I have an idea (That's how this whole ball got rolling by the way!) Kyle's communications console soon to be built will incorporate what I feel will be the optimum a system of this type can achieve. It will make full use of the 30 watt transmitter and contain the 18 watt electronics amplifications for the listen or "a" channel. With his permission, we could use "the best of the best" to derive at this systems limitations and learn the most from this whole thing. On this system I will install a special switch (covered against accidental activation) that will send a out very loud siren sound while terminating incoming hydrophone signals for amplification. This siren would be tested prior to the subs deployment but would not normally used once underway. It's purpose would be to instantly notify the support vessel of a problem (snagged in cables, flooding, fire, ect.) that would not allow the submarine from reaching the surface without outside assistance. A call to the local rescue squad would be initiated instantly by cell phone. Following a period of time (60 seconds...1 minute or other predetermined time period) this would be turned off and the details of the problem shared via normal broadband comms. Should the alarm continue,the sub pilot is most likely disabled himself, and this alarm would serve as the beacon to locate this disabled submarine. I am going to redirect my efforts back into passive sonar hydrophone construction but will aid anyone in obtaining one of these simple com sets if desired. I still wish to create a hydrophone that is directional. I was correct in that Kyle's collision avoidance unit only seemed direction due to its placement in front of and low to his air filled conning tower. Sound approaching from aft of his boat was reflected off this tower on account of the air within it. That most submariners are at least concidering passive sonar, collision avoidance listening devices, and underwater communications, I feel my goal has already been achieved. David Bartsch > Date: Fri, 30 Oct 2009 09:43:33 -0400 > From: jonw@psubs.org > To: personal_submersibles@psubs.org > Subject: Re: [PSUBS-MAILIST] Suggestion for UW comms > > > Alec, > > Good suggestion. Can you get a supplier name and model number? > I believe Davids Comm setup will require four pins since he uses a > separate transmit and receive unit. A four pin (if reasonably priced) > would allow for some future expansion as well, and perhaps offers more > flexibility. Once you have a supplier picked out I can try to contact > them for a group discount, or perhaps I can try to use our Tax ID number > to get the part for wholesale. That would help those on tight budgets. > > Also, it would be nice to do this through our "standards" RFC procedure > so we have a permanent record of it (see > http://www.psubs.org/guidelines/PSUBS). If you can get me the model > information, I'll write up and send out the RFC > (http://www.psubs.org/guidelines/PSUBS/psubs_guideline_form.txt). > > Jon > > > > Smyth, Alec wrote: > > > > UW comms are expensive, but for next year's convention we should make > > a real effort to have the attending subs equipped with them as a basic > > safety requirement. The cheapest way to do so would be to share a > > couple of existing sets. In order to do that, how about if we > > standardized on a bulkhead penetrator? All that is needed for a comms > > transducer, whatever the brand, is a 2 pin low current bulkhead > > penetrator. They run about a hundred bucks. Those of us with comms > > could then have our transducer and headset cables set up so they can > > just be plugged into any sub. > > > > If we standardized on a connector, it would also facilitate tests of > > David's various sonar devices or anything else PSUBS members might > > come up with in the future. > > > > I can look around for the most economical alternatives if this sounds > > like something sub owners would be interested in. > > > > > > 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. > > > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > 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 > ************************************************************************ > ************************************************************************ > ************************************************************************ > Windows 7: I wanted more reliable, now it's more reliable. Wow! |