> let's see if we can obtain an accurate change in field
> strength from added
> base resistance in NEC-2. Here's a 7 MHz vertical mounted
> 1' above average
> Sommerfield GND. The vertical has 16 resonant radials.
<SNIP>
> The relative field strength is exactly as one would
> calculate given the
> source current into 36.9 ohms (in this case we can
> 'assume' that the radiation
> resistance is 36.9 ohms).
I'm sure we all agree if a lumped resistance component is
placed in series with a fixed load resistance-- Ohm's law
will work as expected.
I think the point being missed is the "ground resistance"
measured at the base of a vertical by watching the impedance
change at best has only a very poor relationship to the
actual ground loss in the antenna.
73 Tom
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