UHF 3-Bay Hourglass-Loops (NO Reflector) analyzed using 4nec2 after determining best dimensions using nikiml's Python Optimization Scripts.
Compare to performance of 2-Bay Hourglass-Loop with HVH: UHF Raw Gain FORWARD = 7.8 to 9.7 dBi, F/B & F/R Ratio has small (1.3 dB) increase at high frequencies (just -0.1 dB at low frequencies), and SWR (300-ohms) under 2.1. Hi-VHF Raw Gain = 4.6 to 5.6 dBi and SWR (300-ohms) = 67 to 33 is Excessive.
===================================== Multiple versions were analyzed with different methods for Combining Antennas:
a) Three EX Statements, emulating a PERFECT 3-Way Combiner.
UHF Raw Gain = 9.6 to 11.6 dBi and SWR (300-ohms) Under 1.9. Hi-VHF Raw Gain = 5.7 to 6.6 dBi and SWR (300-ohms) = 69 to 23 is Excessive.
Roughly 2 dB higher UHF Raw Gain than 2-Bay....most would be lost in a REAL 3-Way RF Combiner.
===================================== b) Two "Shortest Path" Feedlines From Center, SAME Width as Hourglass Center Wire. Disappointing...NO Gain improvement versus 2-Bay on low freqs and only 0.4 dB more on high freqs.
UHF Raw Gain = 7.8 to 10.1 to 9.6 dBi Up to 0.2 dB MORE Forward on Lower Channels and SWR (300-ohms) Under 3.7. Hi-VHF Raw Gain = 5.1 to 6.5 dBi and SWR (300-ohms) = 30 to 55 is Excessive.
Max UHF Gain is only 0.3 dB higher than 2-Bay with higher SWR, so ANOTHER approach is needed.
===================================== c) Two "Shortest Path" Feedlines End-Fed from Bottom, SAME Width as Hourglass Center Wire.
Very Poor UHF Performance.
===================================== d) Two HVH (Holl_ands Vertical Harness) Feedlines From Center. Disappointing...NO Gain improvement versus 2-Bay on low freqs and only 1 dB more on high freqs, although Hi-VHF SWR improved some, but was still Excessive.
UHF Raw Gain = 7.8 to 10.6 dBi and SWR (300-ohms) Under 1.8. Hi-VHF Raw Gain = 3.9 to 4.5 dBi and SWR (300-ohms = 17 to 4.2 is Excessive.
===================================== e) Double Tier HVH: Two HVH (Holl_ands Vertical Harness) Feedlines From Center, with their mid-points fed from a Common SOURCE via another pair of Feedlines. BEST Feedline arrangement, provides about 3 dB more UHF Raw Gain that 2-Bay Hourglass-Loop. Hi-VHF Raw Gain is significant, directed forward but with Excessive SWR.
UHF Raw Gain = 10.6 to 12.5 to 12.4 dBi, F/B & F/R Ratio = 1.2 to 2.8 dB and SWR (300-ohms) under 2.3. REVERSE UHF Raw Gain = 9.4 to 9.2 to 9.7 to 9.6 dBi. Hi-VHF Raw Gain = 5.3 to 6.8 dBi with slightly (0.1 to 0.2 dB) more Gain to REAR and SWR (300-ohms) = 11.4 to 8.1 is Excessive.
Date(s): 19 Nov 2014. Album by holl_ands. 1 - 93 of 93 Total. 4612 Visits.
enlarge 51KB, 528x1024 1 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner 3D View
enlarge 148KB, 495x1024 2 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner Front View [1 large square = 5 inches]
enlarge 28KB, 791x1024 3 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner 4nec2 File
enlarge 142KB, 1152x494 4 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner UHF Raw Gain versus VS at 470 MHz VS = Vertical Separation between Antennas
enlarge 126KB, 1152x494 5 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner UHF Raw Gain versus VS at 584 MHz VS = Vertical Separation between Antennas
enlarge 142KB, 1152x509 6 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner UHF Raw Gain versus VS at 698 MHz VS = Vertical Separation between Antennas
enlarge 203KB, 1024x739 7 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner UHF SWR (300-ohms) versus VS at 470 MHz VS = Vertical Separation between Antennas
enlarge 188KB, 1024x739 8 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner UHF SWR (300-ohms) versus VS at 584 MHz VS = Vertical Separation between Antennas
enlarge 204KB, 1024x739 9 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner UHF SWR (300-ohms) versus VS at 698 MHz VS = Vertical Separation between Antennas
enlarge 166KB, 1024x739 10 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner UHF Raw Gain = 9.6 to 11.6 dBi
enlarge 183KB, 1024x739 11 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner UHF SWR (300-ohms) Under 1.9
enlarge 231KB, 1024x739 12 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner UHF Impedance
enlarge 314KB, 1024x1024 13 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 470 MHz
enlarge 315KB, 1024x1024 14 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 530 MHz
enlarge 316KB, 1024x1024 15 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 590 MHz
enlarge 315KB, 1024x1024 16 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 650 MHz
enlarge 315KB, 1024x1024 17 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 698 MHz
enlarge 311KB, 1024x1024 18 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 806 MHz
enlarge 158KB, 1024x739 19 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner Hi-VHF Raw Gain = 5.7 to 6.6 dBi
enlarge 198KB, 1024x739 20 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner Hi-VHF SWR (300-ohms) = 69 to 23 is Excessive
enlarge 238KB, 1024x739 21 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner Hi-VHF Impedance
enlarge 312KB, 1024x1024 22 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 174 MHz
enlarge 313KB, 1024x1024 23 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 198 MHz
enlarge 316KB, 1024x1024 24 UHF 3-Bay Hourglass-Loops - NO Refl 3 EX Statements Emulate PERFECT Combiner Azimuthal Pattern at 216 MHz
enlarge 46KB, 561x1024 25 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center 3D View
enlarge 142KB, 491x1024 26 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center Front View [1 large square = 5 inches]
enlarge 28KB, 791x1024 27 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center 4nec2 File
enlarge 179KB, 1024x739 28 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center UHF Raw Gain = 7.8 to 10.1 to 9.6 dBi Up to 0.2 dB MORE Forward on Lower Channels and up to 0.2 dB LESS on Higher Channels.
enlarge 159KB, 1024x739 29 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedines from Center UHF Raw Gain = 7.6 to 10.1 to 9.8 dBi to REAR
enlarge 194KB, 1024x739 30 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center UHF SWR (300-ohms) Under 3.7
enlarge 305KB, 1024x1024 31 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center Azimuthal Pattern for 470 MHz
enlarge 306KB, 1024x1024 32 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center Azimuthal Pattern for 530 MHz
enlarge 305KB, 1024x1024 33 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center Azimuthal Pattern for 590 MHz
enlarge 307KB, 1024x1024 34 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center Azimuthal Pattern for 650 MHz
enlarge 306KB, 1024x1024 35 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedines from Center Azimuthal Pattern for 698 MHz
enlarge 299KB, 1024x1024 36 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center Azimuthal Pattern for 806 MHz
enlarge 184KB, 1024x739 37 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center Hi-VHF Raw Gain = 5.1 to 6.5 dBi
enlarge 194KB, 1024x739 38 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center Hi-VHF SWR (300-ohms) = 30 to 55 is Excessive
enlarge 230KB, 1024x739 39 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center Hi-VHF Impedance
enlarge 304KB, 1024x1024 40 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center Azimuthal Pattern for 174 MHz
enlarge 307KB, 1024x1024 41 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center Azimuthal Pattern for 198 MHz
enlarge 311KB, 1024x1024 42 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines from Center Azimuthal Pattern for 216 MHz
enlarge 52KB, 562x1024 43 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines End-Fed 3D View To prevent touching Feedlines, Horizontal Elements are Offset 0.5-in to Rear
enlarge 105KB, 337x1024 44 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines End-Fed Front View [1 large square = 5 inches]
enlarge 113KB, 1152x497 46 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines End-Fed UHF Raw Gain = 5.7 to 10.1 to 7.8 dBi is Very Poor Performance compared to others.
enlarge 190KB, 1024x741 47 UHF 3-Bay Hourglass-Loops - NO Refl 2 Feedlines End-Fed UHF SWR (300-ohms) under 4.5 is Very Poor Performance compared to others.
enlarge 309KB, 1024x1024 67 UHF 3-Bay Hourglass-Loops - NO Refl HVH - Holl_ands Vertical Harness Azimuthal Pattern at 174 MHz
enlarge 309KB, 1024x1024 68 UHF 3-Bay Hourglass-Loops - NO Refl HVH - Holl_ands Vertical Harness Azimuthal Pattern at 198 MHz
enlarge 313KB, 1024x1024 69 UHF 3-Bay Hourglass-Loops - NO Refl HVH - Holl_ands Vertical Harness Azimuthal Pattern at 216 MHz
enlarge 63KB, 582x1024 70 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH 3D View
enlarge 132KB, 384x1024 71 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH Front View [1 large square = 5 inches]
enlarge 82KB, 262x1024 72 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH Side View [1 large square = 5 inches]
enlarge 77KB, 865x1024 73 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH 3D View DETAIL
enlarge 319KB, 975x1024 74 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH Front View DETAIL [1 large square = 1.25 inches]
enlarge 118KB, 403x1024 75 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH Top View [1 large square = 1.25 inches]
enlarge 169KB, 1024x677 76 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH UHF Raw Gain = 10.6 to 12.5 to 12.4 dBi UHF F/B & F/R Ratio = 1.2 to 2.8 dB
enlarge 135KB, 1024x677 77 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH UHF Raw Gain = 9.4 to 9.2 to 9.7 to 9.6 dBi to REAR
enlarge 187KB, 1024x677 78 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH UHF SWR (300-ohms) Under 2.3
enlarge 308KB, 1024x1024 79 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH Azimuthal Pattern at 470 MHz
enlarge 306KB, 1024x1024 80 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH Azimuthal Pattern at 530 MHz
enlarge 305KB, 1024x1024 81 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH Azimuthal Pattern at 590 MHz
enlarge 305KB, 1024x1024 82 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH Azimuthal Pattern at 650 MHz
enlarge 304KB, 1024x1024 83 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH Azimuthal Pattern at 698 MHz
enlarge 302KB, 1024x1024 84 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH Azimuthal Pattern at 758 MHz
enlarge 305KB, 1024x1024 85 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH Azimuthal Pattern at 806 MHz
enlarge 160KB, 1024x677 88 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH Hi-VHF Raw Gain = 5.3 to 6.8 dBi Sightly (0.1 to 0.2 dB) More Gain to REAR
enlarge 170KB, 1024x677 89 UHF 3-Bay Hourglass-Loops - NO Refl Double-Tier HVH Hi-VHF SWR (300-ohms) = 11.4 to 8.1 is Excessive
