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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 7-El Yagi TRIAD H-POL OMNI-PLUS Three 490 MHz (Single 8 MHz Channel) 7-El Yagi's in a TRIAD Array was analyzed using 4nec2 after Optimization for Omni-Directional coverage, revealing it is an OMNI-PLUS Antenna (Gain significantly MORE than 0 dBd in ALL Directions), and is Horizontally Polarized, compatible with most Receive TV Antennas. Min Gain =3.8 dBi, Max Gain =4.3 dBi with SWR between 1.2 and 1.4, which leaves adequate margin for other SWR degradations in a Transmitter Application, such as in the Feedline, Connectors and Proximity to other objects. Just one 7-El Yagi provides H-POL. Gain =  9.9 dBi, F/R Ratio = 3.4 dB, Beamwidth=44-deg and Characteristic Impedance Zo=200-ohms.  So the specific OPTIMIZED Yagi has been specifically crafted to have a specific Beam Pattern...and there is considerable Gain CANCELLATION between the Yagi's in the Array....as well as COHERENT SUMMATION to fill in between each Antenna's 44-deg Beamwidth.  So the Yagi's were EXPLICITLY OPTIMIZED for this Application and I wouldn't expect just any off-the-shelf set of Yagis would work anywhere near as well.... Date(s): 9 Mar 2016. Album by holl_ands. 1 - 15 of 15 Total. 2403 Visits.
enlarge 61KB, 1024x664 1 7-El Yagi TRIAD Array OMNI-PLUS 3D View enlarge 156KB, 1152x442 2 7-El Yagi TRIAD Array OMNI-PLUS Front View [1 large square = 5-inches] enlarge 329KB, 1011x1024 3 7-El Yagi TRIAD Array OMNI-PLUS Top View [1 large square = 5-inches] enlarge 219KB, 1152x703 4 7-El Yagi TRIAD Array OMNI-PLUS UHF Gain enlarge 209KB, 1152x703 5 7-El Yagi TRIAD Array OMNI-PLUS UHF SWR (50-ohms) = 1.2 to 1.4 enlarge 248KB, 1152x703 6 7-El Yagi TRIAD Array OMNI-PLUS UHF Impedance enlarge 304KB, 1024x1024 7 7-El Yagi TRIAD Array OMNI-PLUS Azimuthal Pattern within +/- 0.25 dB Gmin = 3.8 dBi and Gmax = 4.3 dBi enlarge 286KB, 940x1024 8 7-El Yagi TRIAD Array OMNI-PLUS Elevation Pattern Nulls on N-S Axes: -14.9 dBi at Elev = -48-deg enlarge 290KB, 940x1024 9 7-El Yagi TRIAD Array OMNI-PLUS Elevation Pattern Nulls on Diagonals: -20.6 dBi at Elev = -58-deg enlarge 158KB, 1152x504 10 7-El Yagi TRIAD Array OMNI-PLUS Side View [1 large square = 5-inches] enlarge 73KB, 791x1024 11 7-El Yagi TRIAD Array OMNI-PLUS EVAL *.html Performance Summary includes 4nec2 text File enlarge 318KB, 1024x1024 12 Just ONE of the 7-El Yagis Azimuthal Pattern Max Gain = 9.9 dBi, F/B Ratio = 3.4 dB Beamwidth = 44-degrees enlarge 185KB, 1152x715 13 Just ONE of the 7-El Yagis UHF Gain enlarge 221KB, 1152x715 14 Just ONE of the 7-El Yagis Optimum SWR = 200-ohms (vice 50-ohm Array) enlarge 260KB, 1152x715 15 Just ONE of the 7-El Yagis UHF Impedance
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