"Reg Edwards" wrote in message
...

Who the heck are Ramo and Whinnery. Never heard of them! Presumably,
because you refer to them, they are or were people who make or made a
living
out of re-iterating old wive's tales in book-form.

It was obvious I introduced G = C * R / L simply to show that a line's Zo
can be purely resistive even when it is NOT lossless. It can have any
loss
you like.

Apparently you have not yet grasped the idea.

And, despite what R and W or YOU may have to say on the subject, it is an
exact expression at all frequencies from DC to almost infinity.

My only references are Ohm, Ampere and Volta who I'm sure you have heard
of.

But no hard feelings. ;o)

Tonight I'm on Chilean, dry, 2004, MontGras, Reserve Chardonnay. I didn't
choose it myself. My loving daughter does my shopping. But it's quite a
pleasant, refreshing plonk.
----
Regards, Reg.

============================================

"Cecil Moore" wrote
Reg Edwards wrote:
The condition for which Zo of a transmission line is always purely
resistive
(Zo = Ro) is extremely simple. It is -

G = C * R / L

Wonder why Ramo and Whinnery say that's an approximation for low-loss
lines? If the R+jwL angle is equal to the G+jwC angle, doesn't that
make Z0 purely resistive?
--
73, Cecil



Fields & Waves in Communication Electronics, by S. Ramo, J.R. Whinnery, and
T. Van Duzer, Wiley, 3rd edition, 1994

107 proof Baker's for me

73, H.