In Reply to: Air dielectric posted by Tourist on July 14, 2005 at 03:41:29:
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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Follow Ups
- Re: Air dielectric - Carlos 07/14/0512:14:47 07/14/05 (2)
- Re: Air dielectric - ChrisVH 13:18:12 07/14/05 (1)
- Re: Air dielectric - guitarplayer 15:37:11 07/14/05 (0)