Re: Can twisted wire replace shielded wire?

On 2005-11-27, Fred Abse <excretatauris@xxxxxxxxxxxxxxxxx> wrote:
> On Sun, 27 Nov 2005 17:14:25 -0330, Gary wrote:
>
>> David wrote:
>>
>> <snip>
>>
>>> Characteristic impedance and DC resistance are the same if the line is
>>> infinitely long and unterminated.
>>
>>
>> Bull***.
>
> If you mean by "DC resistance", the impedance you would see at the input
> of an infinitely long line, it's not bull***, it's perfectly true, even
> if the line is made of zero-resistance conductors. You'll just see the
> line's characteristic impedance.

what about lines made of copper and plastic?

ISTM that a few hundered kilometers if RG59 is going to measure more
than 75 ohms even with far end is shorted.

There's no way an infinite length will have a lower resistance.

Bye.
Jasen
.