On 29 Jan 2004 05:45:02 -0800, (Maurizio) wrote:

Hi Richard,
I know that some studies have been done in the past using NEC4 to find
the ground wave/space wave fields, but my primary interest is in the
near zone modelling of such MF antennas, in particular in presence of
non-flat ground.
The scope is to make a tool to evaluate the radiated fields in
inhabited regions with limits in the maximum field amplitude.
A tool dedicated to this task would be very useful for the site
evaluation.

I have some idea on based on recent studies, but maybe (as often
happen) that others have already done something interesting.

Are these FCC resources dealing with such issues ?
And if so are they freely available?

Thanks in advance


Maurizio

Hi Maurizio,

Very few here have experience with the expensive NEC4, but I have
heard of such capabilities. Sounds like you want to investigate near
fields against complex terrain - that is going to take a lot of
modeling and a lot of CPU horsepower.

I am sure we would all be interested in the product of your effort.

The FCC does not like complexity, and as such you find a very common
and ordinary sameness to nearly every installation; unless they happen
to have a downtown location elevated above the street (there is one
like that in Spokane WA). Even there, the station conformed to the
slavish 120 radials strung out to neighboring buildings.

73's
Richard Clark, KB7QHC