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holl_ands | Home > Omni & Quasi-Omni Directional Antennas > Browse:FM Flat-Swept SBGH H-POL OMNI-PLUSFM TRIAD 4xRectangular-Loops H-OMNI-PLUSFM Goalkeeper Quad-Trap+Spurs Quasi-OMNIFM TRIAD Array of Dipoles H-OMNIFM Double-Hoop H-POL OMNIFM Double-Hoop + Vertical-Dipole OutsideFM Double-Hoop + Vertical-FD-OutsideFM Double-Hoop + Vert. Dipole In CenterFM Double-Hoop + Vertical-FD-In-CenterFM Double-Hoop + Vertical Whip OutsideFM Vertical Folded Dipole VPOL TRUE-OMNIFM Vertical Stick Dipole V-POL TRUE-OMNIFM + VHF Discone V-POL TRUE-OMNIFM Monopole Whip over Groundplane OMNIFM Turnstile QuasiOMNI Antennacraft FMSSFM Turnstile Quasi-Omni - AlternateFM Turnstile - A-C FMSS RotatedFM ESS Curves - Fracarro & DipolFM ZigZag - Triax FM ZigmaFM Right Circular Folded Dipole PairFM Cycloid Dipole - Circular Polarized490 MHz Flat-Swept SBGH H-POL OMNI-PLUS490 MHz Flat-Swept SBGH OMNI + TOP-HAT490 MHz 3-Dipole TRIAD Array H-POL OMNI490 MHz Crossed-Dipoles + One TL - OMNI490 MHz Crossed-Dipoles, 2 Unequal TLs490 MHz 7-El Yagi TRIAD H-POL OMNI-PLUS490 MHz 4El Yagi Triad H-POL True-OMNI490 MHz Collinear Helical HPOL OMNI-PLUS490 MHz Double Diamond H-POL Quasi-OMNIUHF Vertical Folded Dipole V-POL OMNIUHF SBGH H-POL OMNI-PLUS by nikimlUHF Hoverman Type 1 H-POL Quasi-OmniUHF M4 (10x9.5) Twisted 4-Bay Quasi-OMNIUHF 2xM4 Twisted 8-Bay - Quasi-OMNIHi-VHF Goalkeeper Quad-Trapezoid+SpursHi-VHF Monopole Whip V-POL TRUE-OMNIHi-VHF Vertical Folded Dipole OMNICh2-69 Crossed Loops 90-deg Phase ShiftCh2-69 + FM Crossed Loops - UVOX-22m "Classic" 3QWL+QWL J-Pole
490 MHz 4El Yagi Triad H-POL True-OMNI 490 MHz 4-Element Yagi Triad Array, a TRUE-OMNI-Directional Antenna with Horizontal Polarization was analyzed with 4nec2 after determining Dimensions using nikiml's Python Optimization Scripts. BTW: TRUE-OMNI has SAME Gain in ALL Directions (+/- 1 dB). Raw Gain = 2.7 to 3.3 dBi at 490 MHz and SWR (50-ohms) Under 1.2. That's a lot of complexity for just slighly more than the Gain of simple Dipole. Gain in one direction must be working AGAINST Gain in the opposite direction, bearing in mind that each 4-El Yagi generates Gain of about 8-10 dBi each. Date(s): 13 Apr 2016. Album by holl_ands. 1 - 14 of 14 Total. 2007 Visits.
enlarge 60KB, 1152x709 1 490 MHz 4El Yagi Triad H-POL True-OMNI 3D View enlarge 111KB, 1152x339 2 490 MHz 4El Yagi Triad H-POL True-OMNI Front View [1 large square = 5-inches] enlarge 301KB, 992x1024 3 490 MHz 4El Yagi Triad H-POL True-OMNI Top View [1 large square = 5-inches] enlarge 205KB, 1152x715 4 490 MHz 4El Yagi Triad H-POL True-OMNI UHF Raw Gain enlarge 212KB, 1152x715 5 490 MHz 4El Yagi Triad H-POL True-OMNI UHF SWR (50-ohms) Min at 492 MHz Excellent, under 1.2 from 486 to 494 MHz enlarge 238KB, 1152x715 6 490 MHz 4El Yagi Triad H-POL True-OMNI UHF Impedance enlarge 313KB, 1024x1024 7 490 MHz 4El Yagi Triad H-POL True-OMNI Azimuthal Gain = 2.7 to 3.2 dBi at 486 MHz enlarge 314KB, 1024x1024 8 490 MHz 4El Yagi Triad H-POL True-OMNI Azimuthal Gain = 2.7 to 3.3 dBi at 490 MHz enlarge 318KB, 1024x1024 9 490 MHz 4El Yagi Triad H-POL True-OMNI Azimuthal Gain = 2.7 to 3.5 dBi at 494 MHz enlarge 331KB, 962x1024 10 490 MHz 4El Yagi Triad H-POL True-OMNI Elevation Pattern at 490 MHz Null at 48-deg Look-Down Angle isn't Deep Enough to be much of a Problem enlarge 114KB, 1152x363 11 490 MHz 4El Yagi Triad H-POL True-OMNI Side View [1 large square = 5-inches] enlarge 33KB, 791x1024 12 490 MHz 4El Yagi Triad H-POL True-OMNI 4nec2 File includes Summary of Dimensions enlarge 26KB, 791x1024 13 490 MHz 4El Yagi Triad H-POL True-OMNI EVAL *.txt File Summary of Performance enlarge 73KB, 791x1024 14 490 MHz 4El Yagi Triad H-POL True-OMNI EVAL *.html Performance Summary
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