[TowerTalk] antenna impedence and ground impedence??

[Red]

Hi, Dan;

Can your measure the real and reactive components of the impedance?  
When you say 'loaded vertical,' I'm guessing you imply a vertical 
element shorter than 1/4 wavelength and the real component is less than 
36 ohms.

What model are you using and what ground model?  NEC 2 models don't 
calculate impedance of grounded verticals over real ground very well.  
Ground and wire losses can be calculated as the difference between 
modeled real resistance over perfect ground and measured resistance of 
the actual antenna, but the modeling and other factors must be known.

73 de WOØW

Dan Sawyer wrote:

> All,
>
> I have a questions regarding calculating ground impedance. How can 
> this be measured??
>
> The impedance of a loaded vertical measures about 50 ohms, however 
> model programs predict the antenna impedance is in the range of 10 
> ohms. Does this imply ground impedance is 40 Ohms??
>
> Thanks,
> Dan
>
>
>
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