On Sun, 14 Feb 1999 11:28:09 +0000 "Ian White, G3SEK"
<G3SEK@ifwtech.demon.co.uk> writes:
SNIP
>
>In the end, the only way to find out is to try it. For situations
>where
>an inexpensive and easily machined material such as Delrin is proved
>to
>work, there's no point in paying for PTFE or ceramic.
B&W initially used ceramic forms for their 802 plate RFC. As a cost
reduction they went to Delrin. I have several failed Delrin RFC's here
that all failed at the tube end only which makes me believe it was a RF
related failure, not DC or straight IR losses.
Soft Teflon makes a poor choke form but hard Teflon works quite well. I
believe it has a fiberglass mixture. Machines well and costs less than
pure Teflon.
73 Carl KM1H
>
>73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'
> 'In Practice' columnist for RadCom (RSGB)
> http://www.ifwtech.demon.co.uk/g3sek
>
>--
>FAQ on WWW: http://www.contesting.com/ampfaq.html
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>Search: http://www.contesting.com/km9p/search.htm
>
>
___________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
or call Juno at (800) 654-JUNO [654-5866]
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|