Tweakers' Asylum

Hmmmnnn...

72.37.171.36

SRMcGee

In Reply to: RE: Whut he said. posted by Poindexter on September 19, 2007 at 20:14:10

I'm placing orders with Mouser and Digikey, so this is a possibility if either carries the tubing. But why not use heatshrink? It's cheap and may fit more tightly on the wire. Is there an issue?

Follow Ups:

NO, best insulation is no insulation. - cheap-Jack 08:53:54 09/20/07 (0)
Hi.

This is a very common misunderstanding that insulation got to be tight given all wires come with skin-tight insulation/jacket.

NO, the best insulation is no insulation as free air is the best dielectric next to vaccuum. So the old way using natural material, like cotton or silk is some excellent choice as these natural materials allow air to flow freely in & out as if it were free air for the wire inside.

But Ag wires tarnishes so easily due to oxidation. Polluted city airs make things worse.

So we got to airtight the AG wires. Teflon (FEP, TFE & PTFE) tubing will be the choice as it is not so air permeable & best of all, it got very fast wave propagation velocity (vc) & very low dielectric constasnt (e), next to foam polyethylene & 3rd best to free air. Get thin wall tubing for flexibility.

Airtight both end of the tubing with the exposed Ag ends covered up with Ag solders. It's fun, but some demanding fun.

c-J
RE: Hmmmnnn... - Steve Eddy 08:39:45 09/20/07 (0)
Well, if you just want something cheap to cover the wire, then the heatshrink will do just fine.

se
The issue is... - Russ57 08:20:19 09/20/07 (0)
Many plastics are considered to have a "memory". They store the electrical signal and release it a short time latter. It is claimed this leads to a smearing effect of the signal. Teflon is your best plastic. The closet to teflon in a heat shrink is kynar but it requires very high heat.

If I was you I'd go teflon tubing (which isn't very flexible) or go with what Steve advises.

Russ

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