Topband: The Idiot's Guide To Bi-Directional Two-Wire BeverageConstruction...

[ZR]

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" <mikewate at gmail.com>
To: "topband" <topband at contesting.com>
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 <deswynar at xplornet.ca> 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...?
>>
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