To Larry , Harold and all, sorry for being slow in a reply but I have been
reading the notes about the wire. I have some short lengths left over from
an aircraft job. The rating on it seem very good but I just wanted to make
sure I was not missing something. The Tefzel is very common in aircraft and
appeared to be better than Teflon in some ways so I would consider it good
to use after the experts have also agreed.
Thanks again
KD0ZZ , Rich
I am not getting older but having a propagation problem with the neurons in
the grey matter.
Any errors in spelling or facts are tramsmission errors
-----Original Message-----
From: Larry Benko [mailto:xxw0qe@comcast.net]
Sent: Monday, July 28, 2008 10:18 AM
To: Harold Mandel
Cc: Rich Schmuke; amps@contesting.com
Subject: Re: [Amps] Wire
I had responded to Rich last week but I guess he either didn't like my
answer or just wanted more opinions.
Look at
http://www.welchfluorocarbon.com/techdata.htm#Table1FluoropolymerSelectionGu
ide
for more than you probably want to know. I measured some 20 or 22 gauge
twisted Teflon and Tefzel wire a few years ago and couldn't see any
difference other than Tefzel has a slightly higher dielectric constant
(2.6 vs 2.2). Tefzel is not rated to quite as high temperature but both
are plenty high enough. :)
Also in may last job we used only Tefzel wire in aircraft products. I
think it is becoming more common that Teflon insulated wire. Also the
breakdown voltage is higher than Teflon and the material is harder which
is good for wire that is wound against a surface. Both Teflon and
Tefzel are DuPont registered trademarks.
73, Larry W0QE
Harold Mandel wrote:
> Rich
>
> [snip]
> Does any know a reason why TefzelR ETFE insulated wire would not be as
> good or better because the dielectric strength is even higher...
> [snip]
>
> A balun will generate heat.
>
> Manufacturers of popular baluns realized
> stations would attempt to load RF into
> huge mismatches and because they wanted
> to reduce warranty claims, went for the
> cheapest solution that would withstand
> heated wires the longest.
>
> While PTFE insulated wire is a common
> choice for commercial balun products there
> are always upgrades in quality.
>
> Why not build such a device and test it
> using your ETFE stuff? Mismatch it
> and report on its ability to handle
> high temperatures.
>
> I for one would be very interested in
> insulation that would surpass PTFE.
>
> Hal Mandel
> W4HBM
>
>
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> http://lists.contesting.com/mailman/listinfo/amps
>
>
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