[TowerTalk] antenna file

[jimlux]

N7mal wrote:
> Anyone have a NEC type file of an 80 and 40 meter dipole(no traps) fed with 
> the same feedline.?.?. If so please reply direct.
> THANK YOU
> 
> 
SY, L80=20	' 80m half length
SY, L40=10	' 40m half length
SY, HT=20		' height if above ground
'80 m dipole legs
GW, 81, 20,-L80,0,0.50,-.3,0,0.5,.001
GW, 82, 20, L80,0,0.50, .3,0,0.5,.001
'40m dipole legs
GW, 41, 20,-L40,0,0.0, -.3,0,0,  .001
GW, 42, 20, L40,0,0.0,  .3,0,0,  .001

'wires to feedpoint
GW, 83, 1, -0.3,0,.5,  -0.1,0,0.5, .001
GW, 84, 1,  0.3,0,.5,   0.1,0,0.5, .001

GW, 43, 1, -0.3,0,0, -0.1,0,0.5, 0.001
GW, 44, 1,  0.3,0,0,  0.1,0,0.5, 0.001
' feedpoint
GW, 99, 1, -0.1,0,.5, 0.1,0,.5, .001
' move the whole thing to appropriate height if not free space
GM 0,0,0,0,0, 0,0,HT,0
GE
GN,-1		'free space
'voltage source at feed
EX, 1,99,1,00,1.0,0.0

... whatever analysis you want..

I'd load it into 4nec2 and run the optimizer to adjust L80 and L40 for 
the appropriate match.