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Hi-VHF+UHF LPDA (July 30, 2014)Hi-VHF+UHF LPDA (Log Periodic Dipole Array) Antennas, including Sweept Forward "VEE" types,
analyzed using 4nec2. |
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UHF LPDA (8 Dec 2011)UHF Log Periodic Dipole Array (LPDA) Antennas analyzed using 4nec2.
All are 75-ohms Impedance, except as noted below.
Although analyzed using Zig-Zag Feedlines, Raw Gain should be close if using Dual-Boom Feedline,
although the actual SWR will depend on the Boom dimensions, so construct a detailed model. |
| 16 Albums
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Hi-VHF LPDA (December 24, 2008)Hi-VHF Log Periodic Dipole Array (LPDA) Antennas analyzed using 4nec2.
ZS6BTE's Hi-VHF 14-Element LPDA for comparison to Zig-Zags.
Element lenghts and spacings are same as in Zig-Zags. |
| 5 Albums
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VHF LPDA (25 Aug 2013)| VHF (Ch2-13) Log Periodic Dipole Array (LPDA) Antennas analyzed using 4nec2. |
| 3 Albums
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ZigZagBoom (December 24, 2008)| Zig-Zag LPAs with Center Boom. |
| 1 Albums
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ZigZagNoBoom (December 23, 2008)Wedge Zig-Zag (No Center Wires or "Booms").
Phi=18 degrees (et. al) are optimized for 300-ohm load, using Quarter Inch Tubing or RG cable.
Stacked Zig-Zag is lower (1-2 dB) Gain version when space is not available for Wedge.
EDIT (22Jun2009): Added details for Building and Attic Installation for Hi-VHF Zig-Zag LPA. More to come..... |
| 3 Albums
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FM Stacked ZigZag - As Built About 1967 (December 16, 2008)FM Band, Stacked Zig-Zag Log Periodic Array, using Saw-Tooth RG-59 Wire Elements.
On higher frequencies, Gain is very low and Impedance is TOO HIGH!!
Does not appear to be very well optimized. |
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15 Images
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