Cecil Moore wrote:
. . .
Can the single-wire transmission line be modeled with EZNEC
if the height is greater than 0.2 wavelength?

Can it be modeled with NEC4? If so, could someone do it
and report the results?

I don't think either program can model it. Single wire transmission line
operation depends on an interaction among the field from the wire
current, the insulation, and the air, that NEC-2 and -4 don't model. The
wire insulation calculation provided by EZNEC and NEC-4 only calculates
the effect of insulation on wire impedance, not on how the field
launches from the wire. You might be able to do it with a 3D field
solving program (which, last I heard, were in the $20k+ category).

Roy Lewallen, W7EL

Thanks,
found this website
http://www.amasci.com/tesla/tmistk.html
he gets pretty off-beat: suggesting one can use the earth as the
single-conductor transmission line (as opposed to using an antenna)

"Crazy George" wrote in message
...
Google "G-Line".

"Cecil Moore" wrote in message
...
Hal Rosser wrote:
The idea of a single-conductor transmission line makes it an inviting
idea, but physically building the impedence matching sections on the
ends
look like a real challenge.

A single-wire transmission line has a Z0 of a few
hundred ohms. A transformer at each end is all you
need for impedance matching. The single-wire section
will radiate but it's surprising to me how much power
can be delivered to a load at the end of the wire.

My Electronics Equations Handbook give the Z0 of a
single-wire transmission line as 138*log(4D/d) where
'D' is the distance above ground and 'd' is the
diameter of the wire. A 0.1" dia. line 30 ft. in
the air has a Z0 of 574 ohms.
--
73, Cecil http://www.qsl.net/w5dxp

your idea of an impedence transformer at each end is interesting,
also, this website goes into some detail - and even goes as far as to
suggest using the earth as the single-conductor transmission line.
http://www.amasci.com/tesla/tmistk.html