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 holl_ands | Home > LPDA + ZigZagLPA Antennas > ZigZagNoBoom > 
Hi-VHF Zig-Zag Wedge LPA (No Boom RG-59)
Hi-VHF Band, Zig-Zag Wedge LPA, using Saw-Tooth Wire Elements.
Phi=18 degrees and other variables are optimized for 300-ohm load, using AWG12 or preferably larger wire size,
such as QICT (Quarter Inch Copper Tubing) or Shielded Coax.
Smaller wire sizes have slightly higher SWR and much lower F/B ratios.
Balun (4:1, 300 to 75-ohm coax transformer) connects between two wires connecting Top & Bottom Z-Zs.
See 2nd page for detailed Sweep Plots.  Gain is sightly more than LPDA on high channels and slightly less on low.
Date(s): 2 Jan 2008. Album by holl_ands. 1 - 12 of 26 Total. 4565 Visits.
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14-El LPDA vs 14-El Stacked and Wedge Zig-Zags
Net Gain and Front-to-Back Ratios

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Zig-Zag Wedge LPA (No Boom), Phi=18 degrees.

Vertex positions came from a 14-element LPDA design,
which are projected up & down onto wedges.

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Zig-Zag Wedge LPA (No Boom) Dimensions - Top View.
RED is Bottom and GREEN is Top Zig-Zag.

Dimensions in plane of Zig-Zag to facilitate construction.
Dimensions in X-Y plane are same as Stacked Zig-Zag.  

Click image to see full rez.
Click "X" as usual to close window.

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Zig-Zag Wedge LPA (No Boom).
Inside View looking along X-axis.
One small box = 1 inch.
Note reversal of zig-zag direction.

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Zig-Zag Wedge 14-Elements LPA - Side View.
One small box = 2 inches.
At wide end, Top Z-Z is 31.36 inches above Bottom Z-Z.

Phi=18 degrees is angle between Top & Bottom Zig-Zags.

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4nec2 File: Hi-VHF Wedge (Phi=18deg) Zig-Zag LPA

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Zig-Zag Wedge LPA - Phi=18 - BARE RG-59

Gain = 9.2 to 10.6 dBi.

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Zig-Zag Wedge LPA - Phi=18 - BARE RG-59

SWR less than 1.27
Excellent match to 300-ohm load.

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Zig-Zag Wedge LPA - Phi=18 - BARE RG-59
Impedance vs Frequency.

Hi-VHF Band is 174 to 216 MHz.
Charts include 12 MHz below and above the Band.

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Zig-Zag Wedge LPA - BARE RG-59
Wide Sweep Phi from 5 to 155 degrees.

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Zig-Zag Wedge LPA - BARE RG-59
Medium Sweep Phi from 5 to 55 degrees.

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Zig-Zag Wedge LPA - BARE RG-59
Narrow Sweep Phi from 6 to 26 degrees.

Phi = 14 to 22 degrees is Quasi-Optimum.

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