[TowerTalk] UV and WX deterioration of THHN insulation, and effects

[Guy Olinger]

Current betting money in my neck of the woods is on some actual
deterioration of the surface of the copper caused by compounds in the
degrading insulation. Skin effect forces some degree of current into
the degraded copper which has a higher resistance than the non
deteriorated good stuff in the middle of the wire.

What is not in question is the higher effective resistance of the
conductor + whatever the insulation has turned into at RF after
degradation. That has simply been measured.

73, Guy K2AV

On Wed, Dec 28, 2016 at 1:03 AM, James Wolf <jbwolf at comcast.net> wrote:
> Can someone explain to me why THHN with insulation has the loss that is
> seen?  If it becomes resistive, does it somehow inhibit radiation and does
> it result in heat in the radiation?
> If it only becomes resistive, then why would it be an issue?
>
> Jim - KR9U
>
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