This is the 4NEC2 antenna bend model for: Standard Bent-endVertical Dipoles
To use this model:
Below. Highlight and copy (Ctrl C) the program control codes (CM,
CE, SY,etc).
Open Windows Wordpad and copy (Ctrl V) the control codes into Wordpad.
Go to "File, Save as..." and name your new antenna model.
In Windows Explorer, right-click on your new model and "Rename" the file to end as ".nec".
Open your new model to optimize the Length (L=) of the dipole
wire at the desired bend Ratio (R=) (arm=) and bend Angle (Ang=)
of interest.
4NEC2 is an NEC2, NEC4, Windows based antenna modeler and optimizer by
Arie Voors.
It is available free of charge at: www.qsl.net/4nec2/
CM Standardized Vertical Bent-end
model for comparison studies.
CM #14 AWG. Feedpoint at 1/2 wavelength over ground at 28.4 mc.
CM Variable distance of bend point from ends.
CM Bends on same side or Opposite side at any angle.
CM Dick Reid, KK4OBI, 2016
CM
CE
SY hgh=5.282
'150/28.4=5.282=1/2 wl feedpoint
height - meters
SY L=5.261399
'Optimized length of 1/2 wave dipole - meters
SY Segs=51
'Number of segments in 1/2
wave
SY R=0.6
'Bend Ratio 1=no
bend, 0.8=80% , 0.5=50% half-way
SY Arm=L*R
'Length of fixed vertical central Arm
SY SegsArm=Segs*R
'Number of segments in fixed vertical central arm
SY Bend=L*(1-R)/2
'Length of bend end section
SY SegsBend=Segs*(1-R)/2 'Numbers of segments in bend
end section
SY Ang=45
'Bend end angle 0=no
bend, 45=East, 135=West
SY X=Bend*SIN(Ang)
'X-value of bend end
SY Z=Bend*COS(Ang) 'Z-value of
bend end
GW 1 SegsArm
0 0 hgh-Arm/2
0 0
hgh+Arm/2 #14 'Center vertical section
GW 2 SegsBend
0 0 hgh+Arm/2
0 Bend hgh+Arm/2
#14 'Upper Bend end (-Bend for opposite side)
GW 3 SegsBend
0 0 hgh-Arm/2
0 Bend hgh-Arm/2
#14 'Lower Bend end
GE -1
GN 2 0
0 0 14 6.e-3
EK
EX 0 1
SegsArm/2 0 1
0 0
FR 0 0
0 0 28.4 0
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