> The dialectric has very little effect if you do not have the shield hooked
> up at both ends. Coax is coax only if you use the shield.
>
i don't think so. there is still the conductor there and the dielectric is
between them. you can't get rid of the capacitance between them, nor can you
get rid of the losses in that capacitor. i would expect very different
effects based on the lengths of the coax if you don't connect the shield since
it would effectively be a floating conductor. this could lead to strange
resonances and possibly very high voltages near the ends if it happens to be a
resonant length.
i would also expect that you may lose the advantages of the shielding for
running them as a balanced line if you don't connect the shields. leaving the
shields floating in this case would cause coupling between the floating
shields and would probably open you up to problems with nearby conducting
objects which is one of the few advantages to using the parallel coax this
way.
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