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holl_ands | Home > Multi-Diamond Antennas > Browse:UHF Four-Unequal-Diamonds - 11 Refl RodsUHF Four Unequal Diamonds - 13 Refl RodsUHF Four-UnEqual-Diamonds CutEnds - 13RR
UHF Four Unequal Diamonds - 13 Refl Rods UHF Four Unequal Diamonds with 13 Reflector Rods analyzed using 4nec2. Active Element dimensions were same as for Dnes 11 Reflector Rod version, except that "SKALE=0.97" factor was adjusted so that Max Gain was closer to 698 MHz, the top of the New UHF Band. Rod Length, Rod-Rod Separation and Rod-Element Separation were then determined using nikiml's Python Optimization Scripts. Resulting design met my desired goals of F/R Ratio larger than 15 dB and F/B Ratio larger than 20 dB. Raw Gain increases from 10.5 to 11.5 dBi with SWR under 2.4 and CONSTANT Beamwidth of 70-deg from 470 MHz up thru 758 MHz, making it an unusually WIDE Beamwidth Antenna. Large Diamond Element Lengths: 5.47 (fm Feedpoint) & 6.21.  Small Diamond Element Lengths: 4.74. Feedpoint Gap = 2 inches; Large Diamond Outer Apex: Y=4.85, Z=3.88; Crossover: Xhop=0.5, Z=7.76; Small Diamond Outer Apex: Y=2.72, Z=11.64; Max Z=15.52. Reflector Rod Length = 13.75 inches, Rod-Rod Spacing = 1.88 inches, Rod-Element Separation = 3.68 inches. Date(s): 3 May 2013. Album by holl_ands. 1 - 21 of 21 Total. 3490 Visits.
enlarge 92KB, 584x1024 1 Four Unequal Diamonds - 13 Refl Rods 3D View Crossovers between Large & Small Diamonds do not touch. enlarge 188KB, 547x1024 2 Four Unequal Diamonds - 13 Refl Rods Front View [1 large box = 2.5 inches] enlarge 77KB, 248x1024 3 Four Unequal Diamonds - 13 Refl Rods Side View [1 large box = 2.5 inches] enlarge 196KB, 1152x678 4 Four Unequal Diamonds - 13 Refl Rods UHF Raw Gain = 10.5 to 11.5 dBi enlarge 206KB, 1152x678 5 Four Unequal Diamonds - 13 Refl Rods UHF SWR (300-ohms) is Under 2.4 enlarge 244KB, 1152x678 6 Four Unequal Diamonds - 13 Refl Rods UHF Impedance enlarge 304KB, 1024x1024 7 Four Unequal Diamonds - 13 Refl Rods Azimuthal Pattern at 470 MHz enlarge 305KB, 1024x1024 8 Four Unequal Diamonds - 13 Refl Rods Azimuthal Pattern at 530 MHz enlarge 304KB, 1024x1024 9 Four Unequal Diamonds - 13 Refl Rods Azimuthal Pattern at 590 MHz enlarge 305KB, 1024x1024 10 Four Unequal Diamonds - 13 Refl Rods Azimuthal Pattern at 650 MHz enlarge 309KB, 1024x1024 11 Four Unequal Diamonds - 13 Refl Rods Azimuthal Pattern at 698 MHz enlarge 304KB, 1024x1024 12 Four Unequal Diamonds - 13 Refl Rods Azimuthal Pattern at 758 MHz enlarge 300KB, 1024x1024 13 Four Unequal Diamonds - 13 Refl Rods Azimuthal Pattern at 806 MHz enlarge 111KB, 411x1024 14 Four Unequal Diamonds - 13 Refl Rods Top View [1 large box = 1.25 inches] enlarge 28KB, 791x1024 15 Four Unequal Diamonds - 13 Refl Rods 4nec2 File enlarge 166KB, 1152x678 16 Four Unequal Diamonds - 13 Refl Rods Hi-VHF Raw Gain = 0 dBi enlarge 209KB, 1152x678 17 Four Unequal Diamonds - 13 Refl Rods Hi-VHF SWR (300-ohms) is EXCESSIVE enlarge 239KB, 1152x678 18 Four Unequal Diamonds - 13 Refl Rods Hi-VHF Impedance enlarge 314KB, 1024x1024 19 Four Unequal Diamonds - 13 Refl Rods Azimuthal Pattern at 174 MHz enlarge 309KB, 1024x1024 20 Four Unequal Diamonds - 13 Refl Rods Azimuthal Pattern at 198 MHz enlarge 308KB, 1024x1024 21 Four Unequal Diamonds - 13 Refl Rods Azimuthal Pattern at 216 MHz
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