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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
2m "Classic" 3QWL+QWL J-Pole 2-meter "Classic" J-Pole with L1=3/4 and L2=1/4 Wavelength analyzed using 4nec2. Analysis for other L1, L2 Lengths to be provided in a separate Album. Includes PARAMETRIC SWEEP Analysis to investigate Performance as Feedpoint Height is varied and also as L1-L2 Separation is varied. Date(s): 6 Mar 2018. Album by holl_ands. 1 - 27 of 27 Total. 1275 Visits.
enlarge 19KB, 495x1024 1 2m "Classic" 3QWL+QWL J-Pole 3D View enlarge 83KB, 270x1024 2 2m "Classic" 3QWL+QWL J-Pole Side View [1 large square = 5-inches] enlarge 27KB, 791x1024 3 2m "Classic" 3QWL+QWL J-Pole 4nec2 File, includes Dimensions enlarge 199KB, 1152x662 4 2m "Classic" 3QWL+QWL J-Pole 144-148 MHz Raw Gain = 3.0 to 3.1 dBi enlarge 224KB, 1152x662 5 2m "Classic" 3QWL+QWL J-Pole 144-148 MHz SWR(50-ohm) = 1.4 to 1.7 enlarge 248KB, 1152x662 6 2m "Classic" 3QWL+QWL J-Pole 144-148 MHz Impedance enlarge 326KB, 1024x1024 7 2m "Classic" 3QWL+QWL J-Pole Azimuthal Pattern at 130 MHz 130 MHz F/B = 1.3 dB Not Quite a True OMNI enlarge 324KB, 1024x1024 8 2m "Classic" 3QWL+QWL J-Pole Azimuthal Pattern at 146 MHz 146 MHz F/B = 1.3 dB Not Quite a True OMNI enlarge 317KB, 1024x1024 9 2m "Classic" 3QWL+QWL J-Pole Azimuthal Pattern at 160 MHz 160 MHz F/B = 0.7 dB Not Quite a True OMNI enlarge 324KB, 1024x1024 10 2m "Classic" 3QWL+QWL J-Pole Elevation Pattern at 130 MHz enlarge 324KB, 1024x1024 11 2m "Classic" 3QWL+QWL J-Pole Elevation Pattern at 146 MHz enlarge 327KB, 1024x1024 12 2m "Classic" 3QWL+QWL J-Pole Elevation Pattern at 160 MHz enlarge 202KB, 1152x662 13 2m "Classic" 3QWL+QWL J-Pole 420-450 MHz Raw Gain ~ 0 dBi enlarge 219KB, 1152x662 14 2m "Classic" 3QWL+QWL J-Pole 420-450 MHz SWR(50-ohms) is Too High enlarge 249KB, 1152x662 15 2m "Classic" 3QWL+QWL J-Pole 420-450 MHz Impedance enlarge 312KB, 1024x1024 16 2m "Classic" 3QWL+QWL J-Pole Azimuthal Pattern at 400 MHz Significant Gain Loss to the Rear enlarge 333KB, 1024x1024 17 2m "Classic" 3QWL+QWL J-Pole Azimuthal Pattern at 440 MHz Not Quite True Omni enlarge 322KB, 1024x1024 18 2m "Classic" 3QWL+QWL J-Pole Azimuthal Pattern at 470 MHz Moderate Forward Gain Loss enlarge 326KB, 1024x1024 19 2m "Classic" 3QWL+QWL J-Pole Elevation Pattern at 400 MHz Significant Gain Loss enlarge 327KB, 1024x1024 20 2m "Classic" 3QWL+QWL J-Pole Elevation Pattern at 440 MHz Significant Gain Loss enlarge 328KB, 1024x1024 21 2m "Classic" 3QWL+QWL J-Pole Elevation Pattern at 470 MHz Significant Gain Loss enlarge 207KB, 1152x662 22 2m "Classic" 3QWL+QWL J-Pole 146 MHz Raw Gain ~ 3.0 dBi for Sep = 2 to 16 inches Raw Gain drops off less than 3.0 dBi for Sep above 18 and NULL near 40 inches enlarge 197KB, 1152x662 23 2m "Classic" 3QWL+QWL J-Pole 146 MHz F/R Ratio = 1.5 to 5.7 For Sep = 2 to 22 inches Closest to "True Omni" for small Sep Highest F/R near Sep = 16.5 inches enlarge 225KB, 1152x662 24 2m "Classic" 3QWL+QWL J-Pole 146 MHz SWR(50-ohms) Under 2.7 for S12 = 2 to 6 inches Increase L1 to L2 Separation for higher Characteristic Impedance enlarge 176KB, 1152x662 25 2m "Classic" 3QWL+QWL J-Pole 146 MHz Raw Gain 2.2 to 2.3 dBi For Hfeed = 1 to 18 Raw Gain roughly CONSTANT as vary Feedpoint Height. A Bit Closer to True Omni as INCREASE Hfeed. enlarge 201KB, 1152x662 26 2m "Classic" 3QWL+QWL J-Pole 146 MHz SWR(50-ohms) Under 2.0 for Sep = 2.5 to 4.5 inches For Higher Characteristic Impedance simply increase Hfeed. enlarge 233KB, 1152x662 27 2m "Classic" 3QWL+QWL J-Pole 146 MHz Impedance for Hfeed = 1 to 19 inches
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