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I was using the Sierra 1 rc Bismarck and the range was 200' at the farthest. Normal boat traffic will no doubt be picked up much farther. It does get flaky when the range is less than 20' but farther out it's great. If I add the analog meter circuit this should get this to within 1 to 3 degrees! The farther out from the array the more accurate the results. The next logical step is for Jens to come up with a time delay circuit whereby three fix mounted hydrophones at the base of a K250/350 can determine the actual bearing with beam forming as apposed to turning an actual array. This is where we intend to go with this. There are some bugs to work out. The need for shielding of signal wires came in loud and clear as I once again heard radio stations...when I ran the rc boat I almost went deaf! It's like when "skunk works" found what shape best evaded radar. Once discovered, they were handed it back and told to find a way to make it fly... We have a passive sonar that can show the bearings of detected contacts. All we need now is a simple way to install and use on these small submarines. We have our work cut out for us. I was very impressed with this first in-water test of this system. David Bartsch From: alanjames@xtra.co.nz To: personal_submersibles@psubs.org Subject: Re: [PSUBS-MAILIST] directional passive sonar has arrived! Date: Mon, 29 Nov 2010 17:40:55 +1300 Keep at it David sounds great.
I guess you now have the added security that you will be able to tell
what direction the crocodiles comming from. (Lake Placid movie)
Alan
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