Topband: Modeling a BOG

[Richard Karlquist]

On 2015-02-22 05:19, Tom W8JI wrote:
> I highly doubt any NEC based model predicts an accurate pattern for
> wires buried in dirt, in ground contact, or very near normal earth.
> 
> It would mostly be a case of GI =GO.
> 
> 73 Tom
> 


Jerry Burke, one of the developers of NEC told me that
they tried to characterize ground by measuring open
wire lines laying on the ground.  It is a straightforward
exercise to back out the complex characteristic impedance
and propagation constants of the line.  The problem they
found was that there was no value of complex ground
conductivity that you could plug into NEC and get the
modeled NEC line to correspond to the measured data.

In any event, if you measure a BOG, you will see that after a
few hundred feet the signal has been attenuated away and
you don't need to waste wire making it any longer.

Rick N6RK