[AMPS] RF Choke Forms

[measures]

>
>I have seen and used Teflon in many high power HF amps.
>It has good D factor numbers, and is easy to groove and tap.
>Henry uses Teflon in all their high power industrial RF generators
>that run continuously, 8 hrs per day; and most of their ham amps.
>Creative Electronics also uses it.
>
>G-10 fiberglass is almost as good, but will usually not survive a
>choke fire. (melts)
>
The key to surviving a choke fire is to unkey promptly.  I had a G10 
choke fire in my 8169 amplifier that it caused a stentorian arc to the 
roof of the rf deck  The G10 discoloured a bit but did not burn.  I 
removed the crispy-crittered turns.  The choke resonance moved up and the 
amplifier exhibited a gain of 65.  .  

My main objections to Teflon are lack of rigidty, cold flow, and 
phosgene.  The D-factor is wonderful.  
>
cheers, Phil. 

-  Rich..., 805.386.3734, www.vcnet.com/measures.  


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