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Re: [TowerTalk] [NCCC] Dielectric Constant of THHN

To: "Jim Brown" <>,"TopBand List" <>,"NCCC" <>,"Tower Talk List" <>
Subject: Re: [TowerTalk] [NCCC] Dielectric Constant of THHN
From: "Dean Straw" <>
Date: Mon, 22 Oct 2007 15:23:28 -0700
List-post: <>

EZNEC Version 5 has a default value of 3.5 for PVC insulated wire's
dielectric constant, with a loss tangent of 0.05. (In EZNEC Version 5, in
the Wires dialog box, right click on the "Diel C" box to see default

73, Dean, N6BV

> Subject: [NCCC] Dielectric Constant of THHN

> I use THHN for antenna wire. For purposes of using NEC to design for
> length, I need the diectric constant of the insulation used in THHN.
> For #12, I've been using a thickness of 0.0445 inch and constant of
> 2.0. Is this a good first approximation?


> Jim K9YC


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