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KK4OBI Bent Dipoles


This is the 4NEC2 antenna bend model for: Off-Center-Feed (OCF) Impedance

To use this model:
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 OFC feedpoint impedance study
CM #14 AWG.  1/2 wavelength feedpoint over ground at 28.4 mc.
CM Velocity factor to hit target frequency
CM Variable Off-Center feed ratio.
CM Dick Reid, KK4OBI, 2016
CM
CE
SY F=28.4                         'Frequency target
SY hgh=5.282                    '150/28.4=5.282=1/2 wl feedpoint height - meters
SY R=0.5                           'off center ratio. 0.5=center feedpoint
SY vel=0.974185               'Optimized #14 AWG velocity factor to hit frequency target
SY L=150/F*R*vel            'ratio arm length - meters
SY oth=150/F*(1-R)*vel    'other arm length - meters
GW    2    25    -L    0    hgh    0    0    hgh    #14    'ratio arm
GW    3    25    0    0    hgh    oth    0    hgh    #14    'other arm
GE    -1
GN    2    0    0    0    14    6.e-3
EK
EX    0    2    25    0    1    0    0
EX    0    3    1    0    1    0    0
FR    0    0    0    0    28.4    0
EN

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