[Prev][Next][Index][Thread]
Pyrex diss. factor
-
To: "'Tesla List'" <tesla@pupman.com>
-
Subject: Pyrex diss. factor
-
From: Tesla List <tesla@stic.net>
-
Date: Wed, 4 Mar 1998 20:48:17 -0600
-
Approved: tesla@stic.net
----------
From: Alfred A. Skrocki [SMTP:alfred.skrocki@cybernetworking.com]
Sent: Wednesday, March 04, 1998 6:49 AM
To: Tesla List
Subject: Re: Pyrex diss. factor
On Saturday, February 28, 1998 10:55 AM Edward V. Phillips
[SMTP:ed@alumni.caltech.edu] wrote;
>> "Glass of all types has large R.F. absorption ie high power factor and
>> as such is a poor choice for any part in a Tesla coil! The same poor
>> performace yielded from salt water/bottle capacitors and glass plate
>>capacitors can be expected from using glass as a secondary form! Much
>>better to use PVC or better still polyethylene or the best of them all
>> Teflon! Although the last one will bankrupt you for sure. Heck even well
>> baked out cardboard tubing that is saturated with polyurethane and
>>allowed to dry under heat is superior to glass!"
> Not inclined to agree. My guess is that you couldn't find any
> measurable difference in the unloaded Q of a coil wound on a glass
> form of typical TC dimensions and one wound on polystyrene, which is
> a much better insulator. There just isn't enough of the electric
> field in the form to make much difference. By the way, my copy of
> "REFERENCE DATA FOR ENGINEERS" lists the dissipation factor of
> pyrex as 0.0036 at 1 MHz, which isn't bad at all.
Whether you agree or not the fact is I have made numerous secondaries
using various materials and glass including pyrex were amoung the worse!
Like I said a properly baked out cardboard tube saturated with
polyurethane has much less losses than ALL types of glass! If you don't
believe me then try it!
Sincerely
\\\|///
\\ ~ ~ //
( @ @ )
-----o00o-(_)-o00o-----
Alfred A. Skrocki
Alfred.Skrocki.Sr@JUNO.com
alfred.skrocki@cybernetworking.com
Visit my Do-It-Yourself Aquarium WEB page at;
http://www.geocities.com/CapeCanaveral/6251
.ooo0 0ooo.
-----( )---( )-----
\ ( ) /
\_) (_/