Which is why military telephone wire as well as old rural Copperweld pairs
are so popular;pacing is a constant and self twisting during installation is
a given.
Calculated self impedance agrees well with results and a properly
constructed set of transformers with minimum C coupling give the best F/R
and common mode isolation.
They do exhibit a velocity factor so you cant make one as long as a single
or wider spaced pair of wires.
With my very poor ground conductivity rain or seasonal variations seem to
have little or no effect, 2-3 ground rods and 25-30' radials establish the
reference.
Carl
----- Original Message -----
From: "Mike Waters" <[email protected]>
To: "topband" <[email protected]>
Sent: Thursday, December 13, 2012 5:05 PM
Subject: Re: Topband: The Idiot's Guide To Bi-Directional Two-Wire
BeverageConstruction...
What we have is a transmission line that carries the signal from one
direction. If the spacing between the wires varies, then the impedance
does. In that case, the F/B ratio can suffer.
The Z ratio of the transformers at each end depends upon this impedance.
http://www.w0btu.com/Beverage_antennas.html#How_far_apart
73, Mike
www.
On Thu, Dec 13, 2012 at 3:08 PM, Eddy Swynar <[email protected]> wrote:
I wonder if I might prevail upon any & all with some first-hand
real-world
experience as to the "criticalness" (if any) between the two wires
running
the length & span of a 2-wire bi-directional Beverage...?
Just how important is a continuos pre-set distance between the wires,
anyway...? And who was it that came up with the necessity of
equally-spaced
wire...? And how did they determine the "optimum" distance the wires...?
_______________________________________________
Topband reflector - [email protected]
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Topband reflector - [email protected]
