Re: Topband: Two Wire Beverage Question

[Herb Schoenbohm <herbs@vitelcom.net>]

Tracey,

As I understand the principles of the Beverage both conductors should be 
parallel to the ground to work properly.  The good operation of a 
Beverage depends on a process known as wave tilt. 

"When a vertically polarized signal travels over the surface of an 
imperfect conductor such as the earth, the wave front leans forward in 
the direction of the propagation.  this is caused by the slower 
propagation of the earth.  the amount of forward tilt depends on the 
frequency of the rf wave and the characteristics of the surface over 
which the wave is traveling.  At the low frequencies at which the 
Beverage is used the wave tilt is approximately proportional to the 
square root of the product of the frequency and coil resistively.  As 
the resistance of the surface is increased, the wave travel along the 
surface is reduced and a greater wave tilt results."  T.O. 31-1-141-15 
U.S. Army Publication

They also add that..... "the wave antenna operates in conjunction with 
ground to produce a vertically polarized radio wave.  However, because 
of the forward tilt, there is horizontal component of the electrical 
field, and it is not exactly in phase with the vertical component.  
Therefore, the resultant polarization of the radiated wave is elliptical."


73

Herb Schoenbohm, KV4FZ

Tracey Gardner wrote:

> Just a quick question on the two wire Beverage as per Jeff Parker, KA1GJ
>
> http://members.cox.net/kb1gw/KA1GJ-Beverage.htm
>
> Am I correct in thinking that using two wires vertically spaced rather than
> horizontally, wouldn't work, due to cancellation?
>
> 73s Tracey
>
>
>  

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