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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-FD-In-Center FM Double-Hoop + Vertical-Folded-Dipole In Center analyzed using 4nec2. This antenna responds to Horizontal and Vertical Polarization, with a Horizontal Gain of -5.2 to +0.8 dBi. Vertical Whip max was +1.2 dBi with a -10 dBi Gain hole on lower freqs for Vertically Polarized signals. Total Gain (Vert. + Horiz.) remained between -1.8 and +2.3 dBi across all angles and frequencies. However, users may be unhappy with performance if a station is only transmitting Vertical Polarity. SWR (300-ohms) was 2.2-7.2. Date(s): 23 Dec 2011. Album by holl_ands. 1 - 18 of 18 Total. 4086 Visits.
enlarge 53KB, 615x1024 1 Double-Hoop + Vertical-Folded-Dipole-In-Center 3D View enlarge 124KB, 379x1024 2 Double-Hoop + Vertical-Folded-Dipole-In-Center Side View [1 big box = 5-inches] enlarge 267KB, 1024x994 3 Double-Hoop + Vertical-Folded-Dipole-In-Center Top View [1 big box = 2.5-inches] enlarge 87KB, 1024x890 4 Double-Hoop + Vertical-Folded-Dipole-In-Center 3D View DETAIL enlarge 199KB, 1024x784 5 Double-Hoop + Vertical-Folded-Dipole-In-Center Side View DETAIL [1 big box = 2.5-inches] enlarge 115KB, 386x1024 6 Double-Hoop + Vertical-Folded-Dipole-In-Center Front View [1 big box = 5-inches] enlarge 156KB, 1152x584 7 Double-Hoop + Vertical-Folded-Dipole-In-Center FM Raw Total Gain FORWARD (90-deg) enlarge 149KB, 1152x584 8 Double-Hoop + Vertical-Folded-Dipole-In-Center FM Total Raw Gain to REVERSE (270-deg) Slightly HIGHER than Forward Gain, esp High Freqs. enlarge 145KB, 1152x584 9 Double-Hoop + Vertical-Folded-Dipole-In-Center FM Total Raw Gain to SIDE (0-deg) Horizontal + Vertical Gain only has small Total Gain loss. enlarge 179KB, 1152x584 10 Double-Hoop + Vertical-Folded-Dipole-In-Center FM SWR (300-ohms) is 7.2-2.2 enlarge 189KB, 1152x584 11 Double-Hoop + Vertical-Folded-Dipole-In-Center FM SWR (75-ohms) is 1.7-11.6 enlarge 148KB, 1152x584 12 Double-Hoop + Vertical-Folded-Dipole-In-Center FM Impedance enlarge 335KB, 1024x1024 13 Double-Hoop + Vertical-Folded-Dipole-In-Center Azimuthal Pattern at 87 MHz enlarge 327KB, 1024x1024 14 Double-Hoop + Vertical-Folded-Dipole-In-Center Azimuthal Pattern at 90 MHz Vertical Polarization Gain Hole enlarge 331KB, 1024x1024 15 Double-Hoop + Vertical-Folded-Dipole-In-Center Azimuthal Pattern at 98 MHz enlarge 339KB, 1024x1024 16 Double-Hoop + Vertical-Folded-Dipole-In-Center Azimuthal Pattern at 103 MHz enlarge 334KB, 1024x1024 17 Double-Hoop + Vertical-Folded-Dipole-In-Center Azimuthal Pattern at 108 MHz Some Gain Loss for Horizontal Polarization enlarge 48KB, 791x1024 18 Double-Hoop + Vertical-Folded-Dipole-In-Center 4nec2 File
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