This is the 4NEC2 antenna bend model for: Zeppelinhorizontal
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 Sag Ratio )R=) 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 This is a Zeppelin type antenna where the 1/4-wave matching section is fed at the middle of the closed end.
CM To do this the 1/4-wave wires are shortened by half the separation distance.
CM Procedure is to: Set Frequency. Set X ~ 1/2 wave. Set A~ 1/4 wave. Optimize (F12) lengths X and A..
CE
SY freq=28.4
SY hgh=33 'feet 1/2 wave 469/freq
SY sep=1 'Separation between wires
SY X=17.03461 '1/2 wave long wire
SY A=8.602632 '1/4 wave short wire
SY Acf=A-(sep/2) '1/4 wave wire minus half separation
SY Embeded Calcs=2
SY Long=X+Acf 'The long straight wire
SY TotWire=Long+Acf 'The total wire
GW 1 75
Acf 0 hgh
Acf+X 0 hgh
#14 '1/2 wave
GW 2 35
0 0 hgh
Acf 0 hgh
#14 'lower 1/4 wave
GW 3 5
0 0 hgh
0 0 hgh+sep
#14 'Separation
GW 4 35
0 0 hgh+sep
Acf 0 hgh+sep
#14 'upper 1/4 wave
GS 0 0 0.3048
GE 1
GN 2 0 0 0 4 0.003
EK
EX 0 3
50% 0 1
0 0
FR 0 0 0 0 freq 0
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