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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. |
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