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Lo-VHF 2-Bay Folded Dipole - OPT
Lo-VHF 2-Bay Folded Dipoles analyzed using 4nec2.

FYI: Ch6 Center Freq = 85 MHz so 1/2-WL = 69.43-in.

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a) Ch6 2-Bay Folded Dipole [using AWG10] with "best" Dimensions determined using
nikiml's Python Optimization Scripts:

L2 = 65.21-in = Folded Dipole Overall Element Length [OPTimized]
HS = 84.11-in =  Height Separation between Folded Dipoles [OPTimized, Max=100-in]
FS = 1.01-in = Feedline Separation [OPTimized]
Gap = Gap Size = FS [CROSS-BAR CONSTRAINT]
FW = 2-in = Separation between FD Elements [CONSTRAINT]
RACT = Rfeed = 0.051 [All AWG10]

Ch6 (82-88 MHz) Raw Gain = 6.4 to 6.6 to 6.4 dBi and SWR (300-ohms) = 1.8 to 1.6 to 2.1.

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b) Same, except Half-Wavelength Dimensions, i.e. L2+FW = HS = 1/2-WL = 69.43-in.
Somewhat lower Gain, SWR still Excellent.

Ch6 (82-88 MHz) Raw Gain = 5.9 to 6.3 dBi and SWR (300-ohms) = 2.0 to 1.6 to 2.0.
Date(s): 9 May 2018. Album by holl_ands. 1 - 14 of 14 Total. 0 Visits.
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Ch6 2-Bay Folded Dipole - OPT
3D View


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Ch6 2-Bay Folded Dipole - OPT
Front View
[1 large square = 12.5-inches]


Enlarge Microsoft Word Document 3
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DOC3
Ch6 2-Bay Folded Dipole - OPT
4nec2 text File includes Dimensions


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Ch6 2-Bay Folded Dipole - OPT
Ch6 (82-88 MHz) Raw Gain
= 6.4 to 6.6 to 6.4 dBi


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Ch6 2-Bay Folded Dipole - OPT
Ch6 (82-88 MHz) SWR (300-ohms)
= 1.8 to 1.6 to 2.1


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Ch6 2-Bay Folded Dipole - OPT
Ch6 (82-88 MHz) Impedance


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Ch6 2-Bay Folded Dipole - OPT
Azimuthal Pattern at 82 MHz


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Ch6 2-Bay Folded Dipole - OPT
Azimuthal Pattern at 85 MHz


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Ch6 2-Bay Folded Dipole - OPT
Azimuthal Pattern at 88 MHz


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Ch6 2-Bay Folded Dipole - OPT
Elevation Pattern at 82 MHz


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Ch6 2-Bay Folded Dipole - OPT
Elevation Pattern at 85 MHz


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Ch6 2-Bay Folded Dipole - OPT
Elevation Pattern at 88 MHz


Enlarge Microsoft Word Document 13
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DOC13
Ch6 2-Bay Folded Dipole - OPT
EVAL Performance Summary text File


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HTML14
Ch6 2-Bay Folded Dipole - OPT
EVAL Performance Summary *.html


 
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