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Tying conductors together for signal wiring in chassis
Tying conductors together for signal wiring in chassis
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Old 22nd December 2017, 09:49 AM   #11
DF96 is offline DF96  England
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Join Date: May 2007
Quote:
Originally Posted by force of 1/2
I called the shield “floating” because it is only attached to ground at one end. I apolgize if I used the wrong term, though I don’t think I did.
'Floating' means not connected to anything anywhere.

Quote:
The original grounding scheme works well, so I don’t need to experiment there.
. .
The original coax only carries the “signal” (or flow as Scottjoplin called it). The shield does not carry the signal return. The returns are accomplished by short leads from the input jacks to the star ground. The coax cable in question is only carrying “signal” from input jacks to the selector switch.
That is the wrong way to do things. You may get away with it this time, but that just means you are lucky.

Quote:
Does anyone know any reasons (I’d like to hear the science) why tying together a twisted pair inside a shield to make a coaxial wire would present any disadvantages or potential advantages. I know I can use it in any way I choose, but I would like to hear if any one has some solid information to preface the choice.
A twisted pair inside a shield is not coax. Coax means 'coaxial' which means everything has the same axis; it is this symmetry which provides the protection against magnetic fields and then only when the shield is used as the signal return. A pair of wires cannot qualify. All you have is a shielded wire, which will protect against electric fields. You are wide open to magnetic coupling due to the poor grounding arrangements.

As others have said, you could improve things by using shielded twisted pair for the signal wiring. Or you could use the wire as if it were coax by using the shield as signal return. Asking about optimum ways to use the wrong wire with the wrong grounding is not going to get you very far.
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