Zig-Zag Wedge LPA with Center Boom and Quasi-Optimum Phi=10 degrees. Other parameters are also optimized. REQUIRES AWG24 to match 300-ohm load. [Larger wire sizes INCREASE Zo.]
Date(s): 23 Dec 2008. Album by holl_ands. 1 - 10 of 10 Total. 4348 Visits.
enlarge 0KB, 1024x717 1 3D View - Zig-Zag Boom-Wedge. Angle between Zig-Zags is Phi=10 degrees.
Wire vertex positions came from ZS6BTE's 14-element LPDA, which are projected up & down onto wedges.
enlarge 0KB, 1024x700 2 Zig-Zag Wedge LPA with Center Booms. Inside View looking along X-axis.
Keep clicking image to see full rez. Click "X" as usual to close window.
enlarge 0KB, 1024x392 3 Zig-Zag Boom-Wedge LPA - Top View.
enlarge 0KB, 1024x296 4 Zig-Zag Boom-Wedge LPA - Side View.
enlarge 0KB, 1024x819 5 Average Gain Test = 1.0879
enlarge 0KB, 1024x819 6 SWR for 300-ohm load is BETTER with smaller wire sizes.
So we optimized this design for AWG24.
enlarge 0KB, 1024x819 7 Boom-Wedge Zig-Zag - Copper AWG14 Excellent 10.4 to 12.2 dBi Gain. But Front/Back Ratio drops off for low-mid freqs.
enlarge 0KB, 1024x819 8 Boom-Wedge Zig-Zag - Copper AWG14 Excellent SWR less than 1.21
enlarge 0KB, 1024x819 9 Boom-Wedge Zig-Zag - Copper AWG14 - Impedance Hi-VHF, Ch7-13 is 174 to 216 MHz.
