This is the 4NEC2 antenna bend model for: OCF L-Dipole Ratios
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 find the impedance of a dipole
fed at various feedpoints (R=).
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 model for
variable L-Dipole OCF ratio
CM #14 AWG. 1/2 wavelength feedpoint over ground at 28.4 mHz.
CM Off-Center Feed. Must use Auto-Segment. Variable bend ratio.
CM Dick Reid, KK4OBI, 2016
CM
CE
SY hgh=5.2817 '150/28.4 = 5.2817m = halfwave off
ground at 28.4 mHz
SY L=5.2324 'Length of resonant straight wire - meters
SY R=0.6 'Enter off-center bend ratio (0.5 =
center)
SY vert=L*R 'Ratio length of vertical - meters USE
AUTO-SEG!
SY arm=L*(1-R) 'Ratio length of side arm - meters
GW 1 25
0 0 hgh+vert
0 0 hgh
#14 'Vertical
GW 2 25
0 0 hgh
arm 0 hgh
#14 'Side Arm
GE -1
GN 2 0
0 0 14 6.e-3
EK
EX 0 1
25 0 1
0 0
EX 0 2
1 0 1
0 0
FR 0 0
0 0 28.4 0
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