"Reg Edwards" wrote in message
...
The relationship between the three characteristics is more imaginary
than real. It amounts to little more than an old-wives' tale.

The reason attenuation is usually smaller for twin line than coax is
because the twin line conductors are usually of greater diameter than
the coax inner conductor.

*** Thanks - good point
and as Roy pointed out - the voltage would be higher - so the loss would be
lower.
***

And the reason twin line usually has a greater velocity is because the
conductors are spaced further apart and usually there's less
insulating material between them.
****
Does that mean that more insulaton material between the conductors decreases
the velocity factor ?
Ok - its making more sense. Ladder line just happens to have a high VF and
low loss - each for different reasons.
****

But it's quite easy to reverse the situation by obtaining large
diameter, high impedance coax and flimsy close-together twin line.
***
I guess using zip-cord (rubber lamp cord) would be an example.
*********

You guys are good.
Thanks for the info.