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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
FM Double-Hoop + Vertical-Dipole Outside FM Double-Hoop plus Vertical Dipole Outside analyzed using 4nec2. This antenna responds to both Horizontal and Vertical Polarization, although they are only have equal Raw Gain at about 97 MHz. Below 97 MHz, Vertical Gain is reduced by more than 10 dB and above 97 MHz Horizontal Gain is reduced by more than 10 dB. However, Total Gain (Vert. + Horiz.) remained between -1.9 and +2.1 dBi across all angles and frequencies. SWR (75-ohms) was under 5.  SWR (300-ohms) was excessive on the lowest frequencies. Although Raw Gain varies quite a bit,  the Omni-Directional azimuthal coverage remains very consistent across all angles. However, users may be unhappy with performance if a station is only transmitting one Polarity. Date(s): 17 Dec 2011. Album by holl_ands. 1 - 15 of 15 Total. 4323 Visits.
enlarge 71KB, 726x1024 1 FM Double-Hoop + Vertical-Dipole 3D View enlarge 145KB, 563x1024 2 FM Double-Hoop + Vertical-Dipole Front View [1 big box = 5-inches] enlarge 260KB, 1024x974 3 FM Double-Hoop + Vertical-Dipole Top View [1 big box = 2.5-inches] enlarge 183KB, 1152x584 4 FM Double-Hoop + Vertical-Dipole FM Total Raw Gain FORWARD enlarge 146KB, 1152x584 5 FM Double-Hoop + Vertical-Dipole FM Total Raw Gain to SIDE (0-deg) enlarge 178KB, 1152x584 6 FM Double-Hoop + Vertical-Dipole FM SWR (300-ohms) Excessive on Low Freqs enlarge 187KB, 1152x584 7 FM Double-Hoop + Vertical-Dipole FM SWR (75-ohms) Under 5.0 enlarge 158KB, 1152x584 8 FM Double-Hoop + Vertical-Dipole FM Impedance enlarge 144KB, 560x1024 9 FM Double-Hoop + Vertical-Dipole Side View [1 big box = 5-inches] enlarge 333KB, 1024x1024 10 FM Double-Hoop + Vertical-Dipole Azimuthal Pattern at 87 MHz enlarge 315KB, 1024x1024 11 FM Double-Hoop + Vertical-Dipole Azimuthal Pattern at 91 MHz enlarge 334KB, 1024x1024 12 FM Double-Hoop + Vertical-Dipole Azimuthal Pattern at 97 MHz enlarge 334KB, 1024x1024 13 FM Double-Hoop + Vertical-Dipole Azimuthal Pattern at 103 MHz enlarge 317KB, 1024x1024 14 FM Double-Hoop + Vertical-Dipole Azimuthal Pattern at 108 MHz enlarge 48KB, 791x1024 15 FM Double-Hoop + Vertical-Dipole 4nec2 File
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