UHF 4-Bay Hourglass-Loop (NO Reflector) analyzed using 4nec2 after determining best Dimensions using nikiml's Python Optimization Scripts.
Five alternative versions were analyzed to find the "Best" (version b):
===================================== a) 4 EX Statement Emulate a ZERO LOSS 4-Way Combiner, which would have 1-4+ dB Loss that is NOT shown in these Results:
UHF Raw Gain = 11.0 to 13.0 dBi and SWR (300-ohms) is under 2.0. Hi-VHF Raw Gain = 7.0 to 7.8 dBi and SWR (300-ohms) = 72 to 27 is Very Excessive.
===================================== b) Double Tier HVH: Two HVH (Holl_ands Vertical Harness) Feedlines Interconnect Outer Pairs of Hourglass-Loops, with the HVH mid-points fed from a Common SOURCE via a THIRD HVH. BEST Feedline arrangement, provides about x dB more UHF Raw Gain that 2-Bay Hourglass-Loop. Hi-VHF Raw Gain is significant, mostly Bi-Directional but with Excessive SWR on lower Channels.
UHF Raw Gain = 11.1 to 12.6 dBi, F/B & F/R Ratios = 0.8 to 4.2 dB and SWR (300-ohms) is under 1.8. Hi-VHF Raw Gain = 4.8 to 6.1 dBi is 0.1 to 0.25 dB HIGHER to REAR and SWR = 11.9 to 2.6 is Excessive on Lower Channels.
===================================== c) HVH Feedlines interconnect all adjacent pairs of Hourglass-Loops, fed from Center of the Antenna. For consistency with next two alternatives, Tops and Bottoms of Hourglass-Loops are swept back 0.5-in to prevent hitting Feedlines. Raw Gain was significantly less than either of above, so is not recommended. Hence only a few performance Charts are provided here:
UHF Raw Gain = 9.2 to 12.3 to 12.0 dBi and SWR (300-ohms) is Under 2.9.
===================================== d) "Shortest Path" Feedlines WITHOUT CROSSOVERS interconnect all adjacent Hourglass-Loops, where Feedline Width is SAME as Center Gap in each Hourglass. Raw Gain was significantly less than above with High SWR, so is not recommended:
UHF Raw Gain = 9.2 to 12.0 to 11.6 dBi and SWR (300-ohms) Under 4.2 is HIGH.
===================================== e) "Shortest Path" Feedlines WITH CROSSOVERS interconnect all adjacent Hourglass-Loops, where Feedline Width is SAME as Center Gap in each Hourglass. Unexpectedly, Raw Gain was significantly LESS than above, so is not recommended:
UHF Raw Gain = 8.7 to 10.4 and SWR (300-ohms) is Under 1.5.
Date(s): 28 Nov 2014. Album by holl_ands. 1 - 60 of 60 Total. 3085 Visits.
enlarge 55KB, 510x1024 1 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner 3D View
enlarge 130KB, 372x1024 2 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner Front View [1 large square = 5 inches]
enlarge 30KB, 791x1024 3 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner Front View
enlarge 166KB, 1024x741 4 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner UHF Raw Gain = 11.0 to 13.0 dBi
enlarge 183KB, 1024x741 5 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner UHF SWR (300-ohms) Under 2.0
enlarge 233KB, 1024x741 6 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner UHF Impedance
enlarge 316KB, 1024x1024 7 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 470 MHz
enlarge 317KB, 1024x1024 8 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 530 MHz
enlarge 317KB, 1024x1024 9 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 590 MHz
enlarge 316KB, 1024x1024 10 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 650 MHz
enlarge 315KB, 1024x1024 11 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 698 MHz
enlarge 312KB, 1024x1024 12 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 806 MHz
enlarge 171KB, 1024x741 13 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner Hi-VHF Raw Gain = 7.0 to 7.8 dBi
enlarge 198KB, 1024x741 14 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner Hi-VHF SWR (300-ohms) = 72 to 27
enlarge 231KB, 1024x741 15 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner Hi-VHF Impedance
enlarge 312KB, 1024x1024 16 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 174 MHz
enlarge 313KB, 1024x1024 17 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 198 MHz
enlarge 317KB, 1024x1024 18 UHF 4-Bay Hourglass-Loops - NO Refl 4 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 216 MHz
enlarge 92KB, 686x1024 19 UHF 4-Bay Hourglass-Loops - NO Refl Double Tier HVH 3D View
enlarge 159KB, 496x1024 20 UHF 4-Bay Hourglass-Loops - NO Refl Double Tier HVH Front View [1 large square = 5 inches]
enlarge 89KB, 300x1024 21 UHF 4-Bay Hourglass-Loops - NO Refl Double Tier HVH Side View [1 large square = 5 inches]
enlarge 102KB, 599x1024 22 UHF 4-Bay Hourglass-Loops - NO Refl Double Tier HVH 3D View
enlarge 226KB, 641x1024 23 UHF 4-Bay Hourglass-Loops - NO Refl Double Tier HVH Front View DETAIL [1 large square = 2.5 inches]
enlarge 103KB, 312x1024 24 UHF 4-Bay Hourglass-Loops - NO Refl Double Tier HVH Side View DETAIL [1 large square = 2.5 inches]
enlarge 177KB, 1024x741 25 UHF 4-Bay Hourglass-Loops - NO Refl Double Tier HVH UHF Raw Gain = 11.1 to 12.6 dBi F/B & F/R Ratios = 0.8 to 4.2 dB
enlarge 194KB, 1024x741 26 UHF 4-Bay Hourglass-Loops - NO Refl Double Tier HVH UHF SWR (300-ohms) Under 1.8
