Wire question for Bill or Mark or anyone else

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Toy Maker
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Wire question for Bill or Mark or anyone else

Post by Toy Maker » Wed Jun 22, 2011 6:04 pm

Ok digital cables are supposed to be 75ohm...

What's the difference between a solid core braided wire, and a stranded core braided wire?
Would either make any difference in short runs? Say 1-2 meters. From what I understand, the shielding is the most import and part... ??

Say this wire over coax?

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Re: Wire question for Bill or Mark or anyone else

Post by radioeng2 » Wed Jun 22, 2011 6:17 pm

Lets see....SPDIF is I believe 75 ohm and AES/EBU is 110 ohm.

In general, stranded is for flexible wire use and solid is for installed and not fooled with use.

I think the important part for digital is uniform impedance which probably means the terminating connection as much as the cable. Too me...the braid part refers to the shielding.

Stranded core sounds goofy to me...but I'm not real sure about that. More info is needed than me on this one.
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Good question, James

Post by treitz3 » Wed Jun 22, 2011 6:32 pm

I tend to prefer solid over stranded but this is with speaker cables only. I have no clue how this would impact the signal/sound when it comes to a digital cable. Sorry, that's all I got for ya'. Never used a digital cable before.
Toy Maker wrote:What's the difference between a solid core braided wire, and a stranded core braided wire?
As far as I know, it just refers to what type of wire is located inside [look at the two white and the two red wires, not the outer braiding].
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Re: Wire question for Bill or Mark or anyone else

Post by BillD » Wed Jun 22, 2011 7:22 pm

Well, RG-59/U is available in either stranded or solid. RG-6/U is solid (I think Belden might make a stranded version). Solid core is harder to terminate if you use push-on and crimp stuff, but if you solder, solid is much easier. I'm a solid core fan, myself.
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Re: Wire question for Bill or Mark or anyone else

Post by Toy Maker » Thu Jun 23, 2011 1:41 am

Everything I do is soldered. I don't really care which wire I use. Just trying to see if there is any reason NOT to use the wire above, instead of coax to make a couple digital RCA cables ??
Coax is very stiff, and would rather not use it.

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Re: Wire question for Bill or Mark or anyone else

Post by BillD » Thu Jun 23, 2011 10:59 am

Well, the 75Ω part isn't resistance, it's impedance, and has to do with capacitance and inductance. Now, Z= sqrt(L/C), where L is inductance in Henries and C is capacitance in Farads (and actually, + R for the resistance, which is assumed negligible). Most cables have these listed per foot, but you can see that the "per foot" will cancel out in the L/C calculation (except for R, again insignificant). But, why is it important to be 75Ω. The receiving end is expecting a certain impedance and if it isn't right (either low or high), you get a "reflection" of some of the signal (loss). If it's right, all the signal gets swallowed up by the receiving component.
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Re: Wire question for Bill or Mark or anyone else

Post by TNRabbit » Thu Jun 23, 2011 11:25 am

Toy Maker wrote:Everything I do is soldered. I don't really care which wire I use. Just trying to see if there is any reason NOT to use the wire above, instead of coax to make a couple digital RCA cables ??
Coax is very stiff, and would rather not use it.
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Re: Wire question for Bill or Mark or anyone else

Post by ekog » Mon Jul 18, 2011 1:19 am

Braided wire is normally used for applications where you want ease of handling (Can be bent or lightly twisted with out to much concern) and solid wire is usually to be installed and left in place (repeated bending and handling can more easily cause issues with cable integrity). If the spec’s of the cable are the same pick accordingly. If you’re talking about the braided insulated wire inside the cable (not the actual wire itself) it is usually braided specifically to reject the frequencies produced by the signal being carried across the cable itself (the braid tightness will vary depending on what the cable is designed to be used for) or cable that are collocated to it. Looking at the cable you have in the picture I can’t tell what you’re going to use it for but it looks like good cable (as much as you can tell from the looks of a cable anyway).
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Re: Wire question for Bill or Mark or anyone else

Post by PDR » Mon Jul 18, 2011 1:43 am

ekog.......dont know if your aware,......but your avatar is the same as Nelson Pass....on all his posts, almost everywhere....


kinda creepy......

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