| Sorry to disagree, Reg, but it appears you're overlooking an
important
| point--the difference between the efficiency of the radiating system
| itself, versus the efficiency of the ground area external to the
| radiating system.
|
| BL&E shows that when 90 - 120 (actually 113) radials of 0,4 w/l form
| the ground system for a 1/4 wl radiator, the efficiency is 98.7%
| efficient, REGARDLESS OF THE SOIL RESISTIVITY UNDER THE RADIALS.
This
| is shown by obtaining the field strength of 192 mv/meter at 1 mile
for
| 1000 watts delivered to the antenna under the conditions described
| above, compared to 194.5 mv/meter with a perfect ground having an
| efficiency of 100%
|
| It is only the soil resistivity of the ground external to the radial
| system that determines the field stength external to the radial
| system. Consequently, the soil resistivity (or conductivity, if you
| like) is significant only in the areas external to the radial
system.
|
| Walt, W2DU

Walt,

What if the ground outside the radial system was comprised of 30-1000
feet of sand and rock overlying any conductive soil below? Would we
then be able to measure 192 mv/meter at one mile with our 113 radials
of 0.4 w/l?

Ron, WA4IWN