CM Icom AH7000 (Diamond D-130) Discone Antenna (without top element) NEC model by Carol F. Milazzo, KP4MD
CM http://www.qsl.net/kp4md/modeling.htm
CE
SY hgh=120 'Input feed point height (in.)
SY dsc=11.5 'Input disc radial length (in.)
SY rdl=34 'Input cone radial length (in.)
SY s=1 'Input segment length (in.)
SY sn=2 'Input # of segments in source wire (in.)
SY rad=0.1 'Input radial element radius (in.)
SY sp=8 'Input number of spokes
SY ang=34 'Input cone angle [0°=down 90°=horizontal]
SY f=222 'Input design frequency (MHz)
SY seg=int(dsc/s+0.5) 'Calculate number of segments in disc radial
SY segr=int(rdl/s+0.5) 'Calculate number of segments in cone radial
SY rdlx=rdl*sin(ang) 'Calculate x coordinate of cone radial end
SY rdlz=-rdl*cos(ang) 'Calculate z coordinate of cone radial end
GW 1 sn 0 0 0 0 0 s*sn rad 'Feed point segment
GW 2 seg 0 0 s*sn 0 dsc s*sn rad 'Disc wire
GW 3 segr 0 rdlx rdlz 0 0 0 rad 'Cone wire
GM 1 sp-1 0 0 360/sp 0 0 0 2 'Rotate 360 degrees
GM 0 0 0 0 0 0 0 hgh 1 'Raise antenna to height
GS 0 0 0.0254
GE 1
LD 5 0 0 0 1390000
GN 2 0 0 0 4 0.01
EK
EX 0 1 sn 0 1 0 0
FR 0 0 0 0 f 0
EN