This is the 4NEC2 antenna standard model for: Bow Tie 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 the new model to optimize for various Length and amount of Fan height
(Symbols, "L=, F=").
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 Standard Bow Tie Model generalized for optimization.
CM Half-wave feed point elevation over "Real Ground".
CM AWG #14. Validated by Avg Gain Test.
CM 9-wire design using gap wire and two wires on each end.
CM Auto-seg needs enough segments/halfwave to get at least 3 segs on gap wire
CM Includes imbedded summary calcs.
CM
CM KK4OBI
CE
SY rad=#14 'Size of wire. Radius in meters or AWG number.
SY L=2 'Meters length of bow from middle of gap to end
SY F=0.4498 'Meters Fan half-height above or below middle.
SY G=0.038 'Half the Gap dimension between the ends of the bows.
SY H=4.640373 'Feed point height above ground - meters
SY ## Summary calculations start here ##=1 'Use Shift + Y to see Symbols and Summary calculations
SY TotWide=2*L 'Total Width of Bow Tie meters
SY Feet=TotWide*3.28084 'Convert Total Width to feet
SY Ratio=Feet/3.39 'Half wave dipole width reduction ratio
SY B=L-G 'Base for calculation of right triangle. meters
SY LenAngle=sqr(B*B+F*F) 'Length of one angled wire (hypotenuse). meters
SY LenVert=F*2 'Length of one vertical end wire in meters
SY LenTotal=G*2+LenAngle*4+LenVert*2 'Sum of Gap and all wire lengths. meters
SY LenTotalFeet=LenTotal*3.28084 'Total Wire needed converted to feet
SY HalfAngle=atn(F/L) 'Degrees arctangent of height/width
SY Included Angle=HalfAngle*2 'Degrees angle of Bow Tie
GW 1 9
-L 0 H
-L 0 H+F
rad 'end center up
GW 2 27
-L 0 H+F
-G 0 H
rad 'end up to gap left
GW 3 9
-L 0 H
-L 0 H-F
rad 'end center down
GW 4 27
-L 0 H-F
-G 0 H
rad 'end down to gap left
GW 5 3
-G 0 H
G 0 H
rad 'Feed point gap wire
GW 6 27
G 0 H
L 0 H+F
rad 'end gap right to right up
GW 7 9
L 0 H+F
L 0 H
rad 'right up to right end center
GW 8 27
G 0 H
L 0 H-F
rad 'end cap ight to right down
GW 9 9
L 0 H-F
L 0 H
rad 'right doen tp right center
GE 1
LD 5 0 0 0 58000000
GN 2 0 0 0 13 0.005
EK
EX 0 5
50% 0 1
0 0
FR 0 0 0 0 28.4 0
EN