Heading

1

 

2

3

4

5

6

7

8

9

10

11

 

GW

Wire

geom

Tag

Nr

nr of

segs

X1

Y1

Z1

X2

Y2

Z2

wire radius

 

GM

Geom Move

Tag increm

new structs

Rot X (deg)

Rot X (deg)

Rot Z (deg)

Mov X

Mov Y

Mov Z

From Tag

 

GR

Geom Rotate

Tag increm

total structs

 

 

 

 

 

 

 

 

GE

no gnd

0

 

no ground plane present (Free Space)

 

ground

plane

1

 

Ground plane present, wire-ends for Z=0 are ‘connected’ to ground

(GN card required; screen- and wire radius on GN card should be blank)

 

ground

-1

 

Ground present, wire-ends are not ‘connected’ to ground (GN card required)

EX

Voltage

Src

0

tag nr

segm nr

XX ->

real volts

imag volts

(19: 0 No act.; 1 print rel.admit. matrix asymetry)

(20: 0 No act.; 1 print imp’s for frequency loop)

(*)

Current src

6

tag nr

segm nr

XX ->

real amps

imag amps

 

 

 

 

 

 

 

 

 

 

FR

linear

0

Nr of steps

0

0

start  Mc

Step size

 

 

F1 = F0 + step

 

log

1

nr of steps

0

0

start Mc

Step size

 

 

F1 = F0 * step

GN

free space

-1

 

 

 

 

 

 

 

Nullifies previous ground settings

 

finite ground

0

nr rad. wires

0

0

diel. Const

Cond. S/m

radius screen

radius wires

(In meters) See also GE card

RP card must be set to 4

 

perfect ground

1

 

 

 

 

 

 

 

 

 

sommer

norton

2

0

0

0

diel. Const

Cond. S/m

 

 

note:  conductivity must be negative for frequency loop

LD

nullify

-1

 

 

 

 

 

 

 

 

 

serie RLC

0

tag nr

start segm

0/end segm

R ohms

L Henry

C Farad

 

LD card always in series with EX and TL cards

 

parall

1

see 0

 

 

see 0

 

 

 

LD4 does not supno automatic frequency scaling

 

serie RLC

2

see 0

 

 

R   oh/m

L  H/m

C  F/m

 

 

Grounds: cond:      diel:  

Sea water:           5.0        80

Good ground:      .01        10

Poor ground        .001        4

Polar ice              .0001      1

Fresh water         .002      80

excellent              .03        20

good                    .006      14

avarage               .005      13

poor                     .002      12

 

parall

3

see 0

 

 

see 2

 

 

 

 

impe-dance

4

see 0

 

 

Resis.

Ohms

React. Ohms

-

 

 

wire cond.

5

see 0

 

 

Cond. mho/m

 

 

 

(*)

LC trap

6

See 0

 

 

Q-coil

L henry

C farad

 

(*)

Insula-ted wire

7

See 0

 

 

Diel. const

Coat radius

 

 

TL

trans line

tag-nr port 1

seg-nr port1

tag-nr port 2

seg-nr port 2

imped ohms

Length mtrs

admit real 1

admit ima 1

admit real 2

admit ima 2

 

 

 

a) Multiple ports are connected in parallel                b) If connected to segment with LD; LD is in serie with TL

RP

normal

0

theta steps

phi steps

XNDA

 

theta start

Phi start

Theta stsize

phi stsize

far fld dist.

norm gain F

 

 

add surf wave

1

see 0

 

 XNDA:

17:         0: major/minor axis;        1: vert/hor gain       

18:         0: no norm gain;         1-5: normalized gain

19:         0: power gain;         1: directive gain       

20:         0: no avaraging;         1: avar gain; 2 avar gain

               

                                        (see also page 78 doc.)

Add surface wave

 

ground cond’s

2..3

see 0

Special ground conditions

 

ground screen

4

see 0

Ground-screen; must be specified in GN card !

 

gnd scr, cond’s

5..6

see 0

Botth ground-screen and special ground conditions

PQ

no charges

-1

 

 

 

 

 

 

 

 

 

charges

0

tag nr

start segm

0/end segm

 

 

 

 

 

PT

all curr

-2

 

 

 

 

 

 

 

 

 

no curr

-1

 

 

 

 

 

 

 

 

 

Curr.

0

tag nr

start segm

0/end segm

 

 

 

 

 

 

Receiv- pattern

1..3

tag nr

start segm

0/end segm

 

 

 

 

See page 74 manual

 

 

 

 

 

 

 

 

 

 

 

Geometry cards

I1

I2

F1

F2

F3

F4

 

3-5

6-10

11-20

21-30

31-40

41-50

 

Prog-ctrl cards

I1

I2

I3

I4

F1

F2

F3

F4

F5

F6

 

3-5

6-10

11-15

16-20

21-30

31-40

41-50

51-60

61-70

71-80

 

 

 

Note: - This summary is far from complete. It only lists the most important cards used by the author for his initial steps on the antenna-modeling path…

- Use the ‘Nec-editor’ (See ‘Settings settings’ option on the ‘Main’ form) or consult the Nec-2 user-manual to assist with filling the appropriate positions for the different Nec-2 cards.



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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl2022 - pre published v0.9