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In Reply to: RE: Question for Jneutron posted by JB on June 28, 2007 at 07:11:45
What I did was based entirely on the geometry, the equations, and how well the equations fit the measurements. At no point was audibility addressed. Rather, it allows others the ability to design their own cables, and the limitations that rear their ugly head (like you can't make a cable with both 10 pf per foot and 10 nH per foot).
To sum up in a few points.
1. For a coaxial cable, L times C = 1034 times DC..L is nH per foot, C is pf per foot, Dc is the dielectric constant of the insulator. This is always the tradeoff with coax, this interaction between L and C.
2. The Terman equation works. It's from 1947, and it's good. It works for all parallel wire cords.
3. For parallel flat conductors, it's possible to calculate the capacitance of the cable using the standard capacitor equation,Er*Eo*area/thickness, and then the LC=1034 DC equation to get the inductance, then the impedance using sqr(LC).
4. The best cable is one which matches the load impedance. If it doesn't match, it stores more energy.
Gotta go for now, I'll think of more..
Ask if you wish details so that you can make your own designs.
Cheers, John
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