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.
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.
VHF LPDA (25 Aug 2013)|
|VHF (Ch2-13) Log Periodic Dipole Array (LPDA) Antennas analyzed using 4nec2.||2 Albums|
ZigZagBoom (December 24, 2008)|
|Zig-Zag LPAs with Center Boom.||1 Albums|
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.....
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.