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Wireless 802.11 NMEA server
On Sat, 8 Nov 2003 14:49:10 -0500, "Jim Woodward" jameslwoodward at
attbi dot com wrote: Larry and Todd: It's not quite so simple -- take a look at http://www.mvfintry.com/pix/portland800.jpg. The page cannot be found The page you are looking for might have been removed, had its name changed, or is temporarily unavailable. Please try the following: If you typed the page address in the Address bar, make sure that it is spelled correctly. Open the home page, and then look for links to the information you want. Click the Back button to try another link. HTTP 404 - File not found Internet Information Services Technical Information (for support personnel) More information: Microsoft Support..... Here's the answer to that problem...(c; There are two w/t compartments on the main deck and six below, all possibly with data, as well as tanks. The wheelhouse can also be separated by a w/t door. (Remember that in The Perfect Storm movie, Andrea Gail flooded from the wheelhouse. What really happened, we'll never know.) But, through all those watertight bulkheads, there are wires going through stuffing tubes, right? Are all the wires Navy style with armored shields around them? Maybe you guys are right -- that wireless would work fine -- certainly there are a lot of openings in the bulkheads, although they're all small (2" tops) and sealed with intumescent caulk to keep fire and flood in one place if they happen -- AC, DC, H&C potable water, sal****er fire main, black and gray water, compressed air, diesel, and all the information wires. Oh, the memories. We did an electrical hazard inspection from Shop 51 CNSYD on the USS Saratoga, the old CV in Jacksonville. My God, what a mess she was. 64,000 electrical hits, 29,000 of them Class 1 (must be fixed before restarting the inspection). After two of our tiger team got hurt reaching up into wireways to trace cables they couldn't see, the team leader forbad anyone reaching up into any space he couldn't see his hand in. 440VAC, 400Hz bites HARD! Shake a wireway and sparks shot out all over! Hot wires just layin' up in there! The main electrical feeds go down through the voids on either side of the ship. We traced these big 3phase wires to a bulkhead but they just disappeared on the other side. We found a void noone ever cut a hatch into! The shipfitters cut a hole in it big enough for an inspection hatch and we found three cables, about #0000, DANGLING FROM THE STUFFING TUBES for a length of over 35'! The ship motion had swayed them back and forth, banging them against the bulkheads and wrenching the cables where they went through the stuffing tubes until the bare conductors were breaking apart! All this from the last yard period about 2 years previous. Someone forgot to tie them up and install an inspection hatch! NAVSEA was horrified....(c; The whole inspection was because of that cruiser that caught fire off Lebanon way back in the early 80's and the fire followed the wiring through open, unpacked collars from compartment to compartment. On Saratoga, alone, we ran Florida, Georgia and South Carolina suppliers out of TempSeal to pack them with. Some collars on that carrier are 36" wide by 8-10" high with only a couple of cable running through them! Poor Sara....many she rest in peace. Oh, another fun discovery before I quit. I opened up the fan room that provides fresh air for Central Control, the engineering space where they control all the propulsion from. The huge fan in there puts a big vacuum on this compartment, which gets its intake up a shaft alley under the flight deck. There was a thermostat in there to measure incoming air temperature in the compartment. The capillary tube for this thermostat went through the deck through a FOUR INCH HOLE someone had cut out with a torch, then they dropped the tube down into the compartment below. I got the chief engineer and showed him this hole. "Commander, look down through that hole and tell me what you see.", I requested. "I see some big piece of equipment.", he replied. "We thought so, too. IT'S THE TOP OF THE #2 BOILER! How many people in Central Control will die if that boiler explodes or leaks combustion fumes sucked up by that fan?", I asked, politely. He never answered, running out of the compartment to find the idiot who torched that hole.....Boy he was ****ED! Question then, given that running wire is really easy, because we'll have the conduit for phone, burglar, fire alarm, audio, etc. anyway (sure, maybe all of these can be wireless also, but there are some security issues, etc.), am I better off with wired or wireless? If Larry's right and 802.11 will really reject everything that it might meet, is it a more robust installation to go wireless? This assumes that all of the primary stuff on the bridge is wired -- we're talking about personal computers (in the broader sense of the words) and a couple of non-critical remote readouts here. Naw, in your application, I'd make sure it was all wired. I agree with the other posters hard wires should be the primary feed for data.....however, wouldn't it be nice to be able to see that oil pressure on the #1 engine that faltered and our current course and speed from the notebook in your cabin?.....(c; Or the PDA in your pocket? None of this will go in until we get her on this side of the pond next summer (God willing). I'd be delighted to try it sometime after then.... Good luck to you. Give us a better URL. I'd like to have a look. Larry W4CSC "Very funny, Scotty! Now, BEAM ME MY CLOTHES! KIRK OUT!" |
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