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holl_ands | Home > LPDA + ZigZagLPA Antennas > Hi-VHF+UHF LPDA

Hi-VHF+UHF LPDA Hi-VHF+UHF LPDA (Log Periodic Dipole Array) Antennas, including Sweept Forward "VEE" types, analyzed using 4nec2. Date(s): July 30, 2014. 1 - 1 of 1 Total. Shared

1. HiVHF+UHF 8-El VEE LPDA  (30Jul2014) Hi-VHF+UHF 8-El "VEE" LPDA (with Shorting Stub) analyzed using 4nec2 after Dimensions determined using nikiml's Python Optimization Scripts. Although there is usable Raw Gain in UHF Band, there is a "Gain Hole" and SWR is High except for a narrow range of frequencies. Hi-VHF Raw Gain = 7.5 to 7.1 dBi. UHF Raw Gain = 9.6 to 5.4 (GAIN HOLE) to 11.1 to 10.3 dBi. Hi-VHF SWR (75-ohms) Under 2.4. [BEST Characteristic Impedance] UHF SWR (75-ohms) Under 4.4 and Under 2.7 above 630 MHz. Hi-VHF SWR (300-ohms) = 4.2 to 2.9 to 5.5. UHF SWR (300-ohms) Excessive, except Under 2.7 above 624 MHz. Optimum Forward Swept ANGLE = 26.7-deg was essential to providing best UHF Band coverage. 3883 Visits 18 Images Gallery Album