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Re: Jon, thanks and here are some things I'm sorting through

Actually, you have the basics down, except for #1.

Coax is not necessarily the best geometry, it is just one of the most conveninet, and available in a wider range of god materials.

Twisted pair with an equivalent amount of shielding, WELL SPACED AWAY FROM THE PAIR, will outperform a coax, but the problem with most commercial twisted pairs is that they are so close to one another (thin insulation, which raises the capacitance and dielectric involvement), and have very little spacing of the shield away from the twisted pair.

That is why I tell folks to make a twisted pair from coax cores, the insulation is thicker, and you can then space the shield away enough to avoid the worst of the shield distortion of the EM fields.
Jon Risch

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