NEC-LIST:Biconical antenna- problem with segmantation

Hello

I am student of Electronic engineering in the UNLP (Universidad
Nacional de La Plata) in Argentina.

I am simulating a bconical antenna for 50 to 200 MHz.
I use two programs for simulate it:

  -NEC/WIRES 2.0 by K6STI
  -4NEC2 4.3.2

I have problems when change the segmentation of the first wire ( where
apply the source) because the behavior of the antenna (impedance, gain)
change whit the amount of segment of the first wire.
I don't know why, and which is the correct segmentation.

Please, is anybody can help me I thank you.

the file for NEC/WIRE is:
-----------------------------------------------------------------------

Antena biconica con 8 radiales por lado
Free Space
50 MHz
17 aluminum wire, mm

L=600

1 0 -25 0 0 25 0 6

Shift y 25
rotate z 30
20 0 0 0 0 L 0 6
rotate z -30
20 0 0 0 0 L 0 6
rotate z 0
rotate x 30
20 0 0 0 0 L 0 6
rotate x -30
20 0 0 0 0 L 0 6
rotate x 0

rotate y 45
rotate z 30
20 0 0 0 0 L 0 6
rotate z -30
20 0 0 0 0 L 0 6
rotate z 0
rotate x 30
20 0 0 0 0 L 0 6
rotate x -30
20 0 0 0 0 L 0 6
rotate x 0
rotate y 0
Shift End

Shift y -25
rotate z 30
20 0 -L 0 0 0 0 6
rotate z -30
20 0 -L 0 0 0 0 6
rotate z 0
rotate x 30
20 0 -L 0 0 0 0 6
rotate x -30
20 0 -L 0 0 0 0 6
rotate x 0

rotate y 45
rotate z 30
20 0 -L 0 0 0 0 6
rotate z -30
20 0 -L 0 0 0 0 6
rotate z 0
rotate x 30
20 0 -L 0 0 0 0 6
rotate x -30
20 0 -L 0 0 0 0 6
Shift End

1 source
Wire 1, center
 
----------------------------------------------------------------

The file for 4NEC2 is:

----------------------------------------------------------------

CM Biconical antenna
CM Cone angle 30 deg.
CE
GW 1 1 0.0000 -0.0250 0.0000 0.0000 0.0250 0.0000 .00300000
GW 2 20 0.0000 0.0250 0.0000 0.3000 0.5446 0.0000 .00300000
GW 3 20 0.0000 0.0250 0.0000 -0.3000 0.5446 0.0000 .00300000
GW 4 20 0.0000 0.0250 0.0000 0.0000 0.5446 -0.3000 .00300000
GW 5 20 0.0000 0.0250 0.0000 0.0000 0.5446 0.3000 .00300000
GW 6 20 0.0000 0.0250 0.0000 0.2121 0.5446 0.2121 .00300000
GW 7 20 0.0000 0.0250 0.0000 -0.2121 0.5446 -0.2121 .00300000
GW 8 20 0.0000 0.0250 0.0000 0.2121 0.5446 -0.2121 .00300000
GW 9 20 0.0000 0.0250 0.0000 -0.2121 0.5446 0.2121 .00300000
GW 10 20 -0.3000 -0.5446 0.0000 0.0000 -0.0250 0.0000 .00300000
GW 11 20 0.3000 -0.5446 0.0000 0.0000 -0.0250 0.0000 .00300000
GW 12 20 0.0000 -0.5446 0.3000 0.0000 -0.0250 0.0000 .00300000
GW 13 20 0.0000 -0.5446 -0.3000 0.0000 -0.0250 0.0000 .00300000
GW 14 20 -0.2121 -0.5446 -0.2121 0.0000 -0.0250 0.0000 .00300000
GW 15 20 0.2121 -0.5446 0.2121 0.0000 -0.0250 0.0000 .00300000
GW 16 20 -0.2121 -0.5446 0.2121 0.0000 -0.0250 0.0000 .00300000
GW 17 20 0.2121 -0.5446 -0.2121 0.0000 -0.0250 0.0000 .00300000
GE 0
EX 0 1 1 00 1.0000 0.0000
FR 0 0 0 0 50
EN

-----------------------------------------------------------------------------------

Thanks to all

Dalmiro Oscar Larrea

 PD: I am sorry is my english is not correct at all

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