[Elecraft] OT; Feedline question

[Wes Stewart]

Why do you suppose a little bit of dielectric on the wire would make a huge 
change, when the majority of dielectric is still air?


On 4/15/2017 3:56 PM, Clay Autery wrote:
> Thanks....
>
> So, these numbers are for BARE copper, right?
> Using insulated wire changes things a bunch....
>
> For instance 18 GA THHN/THWN has an approx. dc of 2.35, XLPE has a dc of
> 5 or so....  As the dielectric constant gets larger, things get real....
> fast.
>
> 18 GA THHN/THWN...  (dc = 2.35 approx.)
>
> To get the same 464 Ohms, the Center to center distance must increase to
> 7.52 inches or so...