On 16 sep, 18:11, Roy Lewallen wrote:
On 9/16/2010 1:41 PM, lu6etj wrote:





Hello Roy

I do not saw this post. I do not know how you make the simulation, I
try a similar one changing "Wire Loss" to "User defined" an put there
5 ohm-m.

The "Average gain" results was very bad, as yours, then, thinking of
aspect ratio of IEEE antenna paper (and big masses involved in water
and soil reflections) I modeled it with 300 mm diameter wire. New
Average Gain now was 0.53 = -2.65 dB, pretty near values given in
paper.

Ita was approximateli correct my procedure on EzNEC? what do you think
about results?

Thank you very much in advance.

Miguel LU6ETJ

PD: I will repeat this post in another point of thread becaus this one
it is older.

The conductivity of sea water is about 5 S/m. This is a resistivity of
0.02 ohm-m, which is the value you should enter as wire loss.

Roy Lewallen, W7EL- Ocultar texto de la cita -

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Sorry, it is not my day, I didn't see this answer neither. Ok, TKS, my
mistake, now I put 1/5 S/m = 0.2 ohms-m (free space simulation, 0,97 m
length, 10 segs) and similar results to bad resistivity but with 50 mm
wire diameter now (0,57). Do you trust in this results?, seems more
optimistics than IEEE paper.

Miguel