[SMCARA] FW: RE: Stupid question of the day (SQOD)

[F. Veitch]

Should have sent this to all.

Try the following, build the vertical with the base located the desired
number of ft/m above XYZ=0,0,0 For instance at 10m above the XY=0 plane

So for a 2.5 m long vertical, use 0 0 10 0 0 12.5 
Next place the radials starting at 0 0 0 and extending out the distance
chosen, so for 1 m radials, use 0 0 10 0 1 10 for the first, 0 0 10 0 -1 10
for the second, 0 0 10 1 0 10 for the third, 0 0 10 -1 0 10 for the fourth.

Now there are 5 wires connected at 0 0 10.  Use the first segment in the
vertical wire for the excitation point (and use a fairly large number of
segments - like 20 or so for the vertical.  Run this with no ground just to
see what you get.  Then, add a perfect ground and see what happens.

I use NEC-2, but the geometry should work the same.  Send me your geometry
file and I will try it in NEC-2 for you. 

NEC-WIN Pro is actually the software I use and it will handle HUGE numbers
of segments.  Largest model I have run to date is about 6500 segments.  It
takes about 20 minutes to run on a 1.6 GHz Pentium.  Mininec usually is
segment limited for most applications.  If you have run into segment limits,
let me know and I will run on the big application.


Regards
Fletch
K3JYD