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RE: Dig. Coax in/out audio cables.

Posted by Duster (M) on October 4, 2016 at 11:30:45

In Reply to: RE: Dig. Coax in/out audio cables. posted by PingPing on October 3, 2016 at 14:56:12:

You might be expressing the notion that a twisted pair will pass signal for a digital application, but it won't provide a precision 75 ohm signal transfer from end to end for an S/PDIF digital application. The only reputable S/PDIF digital cable I've come across in the past 20 years that is not a coaxial cable is the Kimber AGDL silver digital cable, which is not even a twisted pair, it's a tri-braided geometry design. I have found no mention of the characteristic impedance of the Kimber AGDL. On the other hand, a balanced AES/EBU digital application interface depends on the mirror-image of a twisted pair for noise cancellation purposes, and the 110 ohm characteristic impedance of an AES/EBU interface involves a generous 110 ohm ± 20% (88-132 ohm) range.

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Text taken from http://www.epanorama.net/documents/wiring/cable_impedance.html

"A twisted pair of 22 gage wire with reasonable insulation on the wires comes out at about 120 ohms for the same mechanical reasons that the other types of transmission lines have their own characteristic impedances."

http://www.epanorama.net/documents/wiring/cable_impedance.html

http://www.epanorama.net/documents/wiring/twistedpair.html

http://www.epanorama.net/documents/wiring/coaxcable.html

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