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Alec, I have the solution already about your forward scanning sonar. If you opened and separated the individual wires within the cable for this sonar unit, you will notice that these are individually wrapped in foil. One wire is not covered with an isolative plastic...this is to say it is exposed. This foil that shrouds each wire aids in isolating them one from another to prevent emi as individual wires transmit a short duration strong signal. This electro magnetic interference is sent down this foil and returns from each wire back into this exposed wire which serves as a common ground. When you severed this cable to install this SEACOM thru hull fitting, these wires are properly insulated but lack any shield. Once within the hull, again, these wires are insulated but are susceptible to emi having no shield. The length of this unprotected cable run is about three feet. Large spike signals in any wire will send noise down all the surrounding wires and give you this interference you see on your screen. Solution: This is at this point theoretical but make good sense... give me time to reinstall the cable to itself omitting this thru hull to first verify this system still fully function (I feel I can fix this) then, once the system if again fully working as it should, we perhaps as a group can devise a way to produce a thru hull connection that will not omit this very needed wire isolating shielding. In this way you could have this unit installed aboard your sub in working and hence usefull form. David Bartsch Hotmail: Trusted email with Microsoft’s powerful SPAM protection. Sign up now. |