[TowerTalk] COUNTERPOISE for Dipoles

[n4kg@juno.com]

Tom,

I prefer to think of 1 WL Quad loops as two 1/2 Wave Length dipoles
stacked 1/4 WL apart with the ends folded towards each other 
resulting in a square loop that is 1/4 WL on each side.

Using this imagery, it is much easier to visualize the current
distributions.  While your description of 1/4 WL dipoles, end
loaded, is also accurate, I don't think most people relate well 
to the concept of 1/4 WL dipoles.

Tom  N4KG

On Sun, 13 Aug 2000  "Tom Rauch" <w8ji@contesting.com> writes:
> 
> > > Consider a loop. It is really two bent 1/4 wl long dipoles, one 
> is
> > > center fed and the other is fed from the ends by the "bent" 
> loading
> > > sections. These loading sections have phase reversal at the 1/2 
> way
> > > point, and oppose each other, so they contribute nothing to far- 
> field
> > > radiation.
> > 
> > Now I'm really confused.  I thought a full wave loop was 2 half 
> wave
> > sections stacked a quarter wave apart.  What am I missing here??  
> > Tom W7WHY
> 
> I edited that wrong. The quad element is two 1/4 wl long dipoles 
> spaced 1/4 wl apart. Take the "bent" out ahead of the 1/4wl 
> dipoles, and it will be better. 
> 
> The 1/4 wl dipoles aren't bent, they are simply end-loaded by the  
> sections beyond the "bend" that contribute nothing to far-field 
> pattern.
> 
> So what you have is two stacked 1/4 wl long end-loaded dipoles. 
> You have the gain of two end-loaded 1/4 wl dipoles stacked 1/4 wl 
> apart. 
> 73, Tom W8JI
> w8ji@contesting.com
> 
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