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Jon, This is simple...Yes butt connections. I exposed only enough wire to install these butt connections leaving the foil on the unstripped wire. This is to say that only 1/4" of the insulation was removed from each wire so to install this butt connection. The foil was left intact on any wire length not used for this connector. Once all color to color connections were made, I electrically taped these together as a bundle. A small amount of simple aluminum foil could have been placed around each wire to ensure full emi protection but as was later found when testing, this 1/2" of unshielded length did not matter. He did a great job at what he did, It was this thru hull incoming cable that caused the bulk of his problem. This cable did have combined foil protection but not from wire to wire. I can unwrap this repair and take photos but this will have to wait until i go back to work on Friday night. In going thru this, It has been proved that this cable can be cut in two to allow for the slightly larger cable plug end to pass thru a thru hull fitting. This would then be reinstalled in a similar manner as i have done once within the submarine. I am sending his thru hull fitting back to him as I am sure it has other uses. David Bartsch > Date: Thu, 18 Mar 2010 12:23:27 -0400 > From: jonw@psubs.org > To: personal_submersibles@psubs.org > Subject: [PSUBS-MAILIST] Interphase Vista > > > Nice work David! > > I have a couple questions about the repair, and a couple comments about > the device. In regards to the repair, can you provide more detail on > what the problem was as well as the solution. Your description did not > say what you did with the shielding of the individual nine wires. Some > photos would speak volumes here. As I understand it, the "cable" > consists of nine individual wires. Eight wires are both insulated and > shielded. The ninth wire is bare. All wires were cut, including the > shielding. You reconnected all the insulated wires with in-line crimps > (I assume you mean a solderless butt connector), and you reconnected the > non-insulated wire with a butt-connector. How then did you handle the > foil shielding for each individual wire? > > Jon > > > > David Bartsch wrote: > > To all (and Alec), > > > > The forward scanning sonar is repaired and wow! I must have one of > > these things! This gives you the ability to split screen the display > > to give a picture view of both the bottom contour and a forward scan > > of what's ahead! > > When not in the split screen mode it shows the depth in large black > > lettering on the upper right of the display. > > I can see the bottom of the above ground pool very well and when > > turned from side to side shows this narrowing of the channel forward > > of the unit on the side with the side of pool closer to this transmit > > head. > > The sensitivity can be adjusted which would be great in weed thick > > areas to diminish this soft return item. > > Selecting greater depths is but a push of a button away. The > > selections are in easy to read menu selections. (for people who are > > challenged like me) > > It is very accurate and uses a lcd display with the forward scan > > being updated from left to right with the speed controlled by the > > depth selection. The deeper of course the slower this scan rate. > > > > Now to the meat of our problem... > > Each wire (of which there are nine) is wrapped in a fine aluminum > > foil. As signals spike there way down the individual wires, any extra > > emf produced by the wire that sends it is transferred to this foil. > > One of the nine wires has no insulation on it and as these foil runs > > are physically touching, this extra signal is channeled to this bare > > wire and in this way does not go to the other wires within this cable. > > To repair this unit, I simply removed the thru hull provided and > > connected this original transducer cable with itself using nine > > in-line crimps (no shielding). The thru hull first installed had three > > feet of wire that although containing individual wires was not > > shielded from cross talk. This is what clouded his display and allowed > > for only bottom depth indications. > > > > How does he install this wire (we already know we can cut this > > cable to insert it perhaps as an intact cable) thru the side of a > > submarine and ensure it is sealed against leaks under water pressure? > > Is there a thru hull that can handle nine wires and keep them from > > transferring emf one wire to another? > > > > I MUST have such a unit! Lets get some idea's on this one as this > > thing is nothing short of awesome! > > > > > > David Bartsch > > > > ------------------------------------------------------------------------ > > Hotmail: Trusted email with powerful SPAM protection. 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