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[AMPS] coil form plastics

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Subject: [AMPS] coil form plastics
From: (
Date: Sun, 14 Feb 1999 14:11:45 -0500

On Sun, 14 Feb 1999 11:28:09 +0000 "Ian White, G3SEK"
<> writes:

>In the end, the only way to find out is to try it. For situations 
>an inexpensive and easily machined material such as Delrin is proved 
>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)
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