NEC-LIST:Modeling a conductive surface in NEC2

  I am trying to evaluate a few ideas for a replacement antenna for my ham
radio club's 2 Meter repeater.

The new antenna will be mounted on one of our city's water tanks. I would
like to take into account the effect of this nearby reflective surface in
the model calculations.

I understand NEC2 cannot model the surface, but that I can simulate the
surface with a wire grid. I need help with some specifics on the grid
structure.

I have a copy of Arie's "Build" to actually generate a grid of the right
size and shape, but I don't know what mesh size (size of the openings) is
appropriate. If I use too large a mesh opening, I suspect it would not
represent a plane surface accurately, but if I just use an
arbitrarily fine mesh, I will cripple this 384MB computer. Is there a rule
of thumb for adequate mesh "pore" sizes in terms of wavelength?

I could also use advice on what diameter "wire" to use for the grid, and
what conductivity, if conductivity is important. I assume it is a steel tank.

Anybody?

Jerry Flanders

W4UK

-- 
The NEC-List mailing list <nec-list_at_gweep.ca>
http://www.gweep.ca/mailman/listinfo.cgi/nec-list