Topband: Make 80m vertical work on 160

[GEORGE WALLNER]

On Sun, 4 Oct 2009 20:28:32 +0200
  "Franki ON5ZO" <on5zo at telenet.be> wrote:
> Gentlemen, please your advice.
> 
> If I were to convert my working resonant 80m vertical 
>into a 80/160m 
> antenna, I assume I have two basic options according to 
>the literature:
> 
> - Use a trap to 'split' the antenna on 80m (resonant at 
>geometric mean of 
> 160/80m frequencies), or
> - Use a loading coil that can be switched in/out 
>...linear loading solution in 
>ON4UN's book. > 
> 
Franki,

I have tried the linear loading described in ON4UN book. 
It was not better than a high Q base mounted loading coil. 
(I guess the Q of the linear loading element is not that 
high.) On the other hand, I have a very good ground system 
here, so that may have masked the difference. Perhaps if 
the ground system was lossier, linear loading would have 
an advantage.

GL es 73,

George
AA7JV