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Re: Air dielectric

HI
Air Dielectric is a misnomer, it is impossible to suspend a wire in free air, one needs at least several anchor points (usually a teflon monofilament twisted around the wire). Some manufacturers use hollow teflon tubes as "air dielectric". Of course the wire will touch the tube at some points.
As far as I know, few manufacturers that use this technique seal the ends of all the tubes. Even if they were sealed, a puncture would mean that new air would come in. No big deal IMO, if the wires have been protected against corrosion.
Regarding vacuum ICs, a puncture means that the dielectric changes from vacuum to air + "whatever is holding the cable" dielectric.
From a dielectric constant viewpoint, the difference is quite small, however, oxidation can be a problem, specially with untreated copper.
I hope this helps
Carlos



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