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With Twisted Pairs, it depends a lot on the spacing

Posted by Jon Risch (B) on July 24, 2016 at 19:56:15

In Reply to: RE: Basic IC Geometry Question posted by WntrMute2 on July 24, 2016 at 09:38:19:

The wires in the photo's you posted all have insulation that is fairly thin. This results in a wire to wire spacing that is fairly close, and even though the insulation quality may be high, it is still going to be manifesting at near 100% effect on the electric fields.

This is one reason that your capacitance per foot is so high.

This thin insulation on the wires is also one reason the shields can have deleterious effects, as it ends up too close to the wires, and interrupts and distorts the electric and magnetic fields. With a good even, tight and consistent twist, the shielding is not needed as much, but often, removing it can help audibly, just because it is too close.

Now, if that wire assembly were to be "taken apart" or disassembled, then you could use the raw individual wires, and ADD some spacing using a benign material such as cotton rope. It wouldn't have to be a very thick rope, in fact you probably wouldn't want something much thicker than the wire and insulation diameter itself. An alternative would be some foamed teflon valve stem sealer. Two or three of these spiraled together, and then the wires twisted around them in the opposite direction would provide some space between the two signal wires.

This would retain most of the benefits of a twisted pair, but reduce the capacitance for such a long run. A 10 foot cable would need to be a decently low C, so this would one way to do so, without the loss of the balanced configuration.

If additional spacing were added, then a shield could be added back onto the twisted pair with the expanded dimensions, but it may have to be a braid from another cable, in order to fit over the now much larger diameter total assembly.

Try to stay away from plated materials, use pure copper or pure silver, the outer shield of a twisted pair is not as critical for materials.



Jon Risch

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