[TowerTalk] How Helically Wound Verticals Really Work (was : Vertical dipoles)

[Roger (K8RI)]

Rick Karlquist wrote:
> Roger (K8RI) wrote:
>   
>>> But a center loaded vertical has a high profile, high wind drag, and is
>>>       
>> more fragile than the helically wound vertical.
>>     
>
> This is a straw man argument.
Hardly. I'm comparing a lumped inductance in the center to turning the 
entire antenna (or most of it) into one long linear loaded antenna.
>   You are comparing a 1 1/2 inch diameter
> HWV with a center loaded vertical using, say, a "bugcatcher" type coil.
>
>   
Yes, that's what center loaded does to get the required inductance. Now 
you could make the coil increasingly smaller and longer, but you'd 
eventually end up with the helically wound antenna.
> Suppose the center loading "coil" is constructed just like the
> "helical" windings,  
>   
Then it becomes a helically wound antenna. The smaller you make the 
diameter the longer it has to be.


73

Roger (K8RI)