[TowerTalk] 40m 4el KLM - replacing linear loading with coils

[David Gilbert]

Definitely true.

There is some benefit, however, to use two loading coils on either side 
of center for each element (instead of center coils) because that gives 
better current distribution along the elements.  Most modern Shorty-40's 
do this, and it's the same reason why some mobile vertical antennas use 
center loading instead of base loading.

I suspect that using two coils for each element might even be stronger 
mechanically since the split elements have less cantilever weight where 
the two coils are positioned versus a single center one.

73,
Dave   AB7E



On 4/28/2020 2:19 PM, jimlux wrote:
>
> One could also simplify the overall design - make all elements exactly 
> the same length, and use different values of the center loading 
> inductance to "tune" the elements.  There's nothing special about the 
> physical length of the elements, other than it creates the right 
> impedance at the right frequency, and you can get there with loading 
> reactance.