Reg Edwards wrote:

"Roy Lewallen" wrote -
I disagree. Transmission lines have two conductors. Radials don't.

Roy, try using your imagination!

My "Electronics Equations Handbook" gives the specifications
for a "SINCLE-WIRE ABOVE-GROUND TRANSMISSION LINE" including
Z0, C, L, and resistivity adjusted for frequency.
--
73, Cecil http://www.qsl.net/w5dxp

I disagree. Transmission lines have two conductors. Radials don't.
Roy, try using your imagination!
My "Electronics Equations Handbook" gives the specifications
for a "SINCLE-WIRE ABOVE-GROUND TRANSMISSION LINE" including
Z0, C, L, and resistivity adjusted for frequency.

Don't forget the single-conductor transmission line invented by Goubau
and named "G-Line" in his honor. Quoting from page 164 of my 1972 copy
of "The Radio Amateur's VHF Manual":

"The basic idea is that a single conductor can be an almost loseless
transmisison line at untra-high frequencies, if a suitable launching
device is used. A similar launcher is placed at the other end.
Basically the launcher is a cone-shaped device which is a flared
extension of the coaxial feedline...."

--
--Myron A. Calhoun.
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448
NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol)

wrote:
I disagree. Transmission lines have two conductors. Radials don't.

Roy, try using your imagination!

My "Electronics Equations Handbook" gives the specifications
for a "SINCLE-WIRE ABOVE-GROUND TRANSMISSION LINE" including
Z0, C, L, and resistivity adjusted for frequency.


Don't forget the single-conductor transmission line invented by Goubau
and named "G-Line" in his honor. Quoting from page 164 of my 1972 copy
of "The Radio Amateur's VHF Manual":

"The basic idea is that a single conductor can be an almost loseless
transmisison line at untra-high frequencies, if a suitable launching
device is used. A similar launcher is placed at the other end.
Basically the launcher is a cone-shaped device which is a flared
extension of the coaxial feedline...."

I was in error in saying that a transmission line must have two
conductors. The "G-Line" is the one exception I know of. But it
certainly doesn't function in anywhere near the same manner as a buried
radial. I'm afraid only Reg knows how his "R-Lines" work.

Roy Lewallen, W7EL

"Cecil Moore" wrote
My "Electronics Equations Handbook" gives the specifications
for a "SINCLE-WIRE ABOVE-GROUND TRANSMISSION LINE" including
Z0, C, L, and resistivity adjusted for frequency.
=======================================
Single-wire lines -

Primary Constants :
The single conductor has resistance and inductance.
Resistance includes radiation resistance.
Space and its contents has permittivity, permeability and conductance.
The 'return path' is space and whatever it contains.

Secondary Constants :
Phase shift and propagation velocity.
Attenuation (loss).

All parameters obey the classical mathematical rules of Maxwell and
Heaviside.

There are also, very common, 2 and 3-wire (3-phase) transmission lines
which have smaller radiation resistances, but radiation resistances
they DO have depending on conductor spacing.
----
Reg.

Reg Edwards wrote:
There are also, very common, 2 and 3-wire (3-phase) transmission lines
which have smaller radiation resistances, but radiation resistances
they DO have depending on conductor spacing.

One of the ARRL Antenna Compendiums describes a 4-wire transmission
line whose Z0 is selectable depending on how the wires are connected.
--
73, Cecil http://www.qsl.net/w5dxp

"Reg Edwards"
There are also, very common, 2 and 3-wire (3-phase) transmission lines
which have smaller radiation resistances, but radiation resistances
they DO have depending on conductor spacing.
__________

Doesn't the term "radiation resistance" normally apply to a characteristic
of antennas -- not transmission lines?

RF