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Hi-VHF 13-El FD-Yagi (2ReflRods) - kgb
Hi-VHF Optimized 13-Element Folded Dipole Yagi (2 Reflector Rods), RESCALED from
a UHF design posted by kgb, analyzed using 4nec2.  Presumes use of Type M Copper Tubing
with O.D.=0.5695-inch.
Boom Length=115.33-in (9.6-ft).

Hi-VHF Raw Gain = 8.3 to 11.3 dBi, F/B & F/R Ratio Min. = 16.5 dB (GOOD) and SWR Under 2.4.
Date(s): 17 Jun 2010. Album by holl_ands. 1 - 11 of 11 Total. 6500 Visits.
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Hi-VHF Optimized 13-Element Yagi (Rescaled kgb)
3D View


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Hi-VHF Optimized 13-Element Yagi (Rescaled kgb)
Top View
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Hi-VHF Optimized 13-Element Yagi (Rescaled kgb)
Front View
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Hi-VHF Optimized 13-El Yagi (Rescaled kgb)
Hi-VHF Raw Gain = 8.3 to 11.3 dBi
F/B & F/R Ratio Minimum = 16.5 dB


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Hi-VHF Optimized 13-Element Yagi (Rescaled kgb)
Hi-VHF SWR (300-ohm) Under 2.4


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Hi-VHF Optimized 13-Element Yagi (Rescaled kgb)
Hi-VHF Impedance


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Hi-VHF Optimized 13-Element Yagi (Rescaled kgb)
Hi-VHF Azimuthal Pattern at 174 MHz


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Hi-VHF Optimized 13-Element Yagi (Rescaled kgb)
Hi-VHF Azimuthal Pattern at 198 MHz


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Hi-VHF Optimized 13-Element Yagi (Rescaled kgb)
Hi-VHF Azimuthal Pattern at 216 MHz


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DOC10
Hi-VHF Optimized 13-Element Yagi (Rescaled kgb)
4nec2 File


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Hi-VHF Optimized 13-Element Yagi (Rescaled kgb)
Side View
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In your nec model for this antenna,  you have defined two SY cards with the same variable(S12). 4nec2 does not allow this, and I am unable to duplicate your results.

The two declaration for S12 are:
S12= 1301/1000   and S12= S11 + S1112
 - 
autofils, Fri, 18 Jun 2010 10:59AM