[Amps] Wire

[d.cutter at ntlworld.com]

My *2kW* Drake balun has a polycarbonate frame around the toroid to support the bare wire off the toroid.  Bare wire cools better, particularly when suspended off the toroid like this.  

David
G3UNA
> 
> From: "Gary Hinson" <Gary at isect.com>
> Date: 2008/07/29 Tue AM 03:18:43 BST
> To: <amps at contesting.com>
> CC: 'Rich Schmuke' <rdj at wildblue.net>
> Subject: Re: [Amps] Wire
> 
> > I often see  a note about the use of Teflon wire for baluns . 
> > Does any know
> > a reason why  TefzelR ETFE insulated wire would not be as 
> > good or better
> > because the  dielectric strength is even higher and the main 
> > reason it I
> > have some wire on hand. Ref wire type M22759/16   (12ga)
> 
> Hi Rich.
> 
> There *may* be some cunning impedence reason but my guess is that the main
> driver for using Teflon insulated wire is good HV insulation coupled with
> low diameter.
> 
> Personally, I find the stripped out inner conductor line from strag ends of
> decent coax to be more than adequate for mine.  And free.
> 
> Mechanical strength and water resistance of the whole job is far more
> important to me than the RF performance.  Corrosion and mechanical stress
> kills my baluns, not the wrong kind of insulation.  Mind you, I do use
> appropriate size and types of core given the power level and band.
> 
> 73,
> Gary  ZL2!FB
> 
> http://www.g4ifb.com/html/homebrew.html
> 
> 
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