UHF Hourglass Loop


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UHF Hourglass Loop

UHF Hourglass Loop analyzed using 4nec2 after finding "best" dimensions using nikiml's Optimizations Scripts.
Based on UHF Hourglass Loop posted by oneolddude in www.digitalhome.ca forum.
However Optimization and Rescaling increased 470 MHz Gain by about 0.5 dB with Max Gain on 698 MHz.

Five versions are analyzed here. ALL provide very wide Beamwidths (60-50 degrees even at High Freqs):

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a) AWG6 or AWG12/10 with NO Reflector Rods (Optimization search across ALL THREE Variables):

UHF Raw Gain = 4.7-6.0 dBi with Excellent SWR under 1.6, using AWG6.
UHF Raw Gain = 5.0-6.0-5.2 dBi with Excellent SWR under 2.0, using AWG12 (or AWG10).

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b) AWG10 Elements + 1/4" 11x Reflector Rods (Optimization search across ALL THREE Variables):

USB Raw Gain = 9.3 to 10.3 dBi, F/B & F/R Ratio = 19.4 dB and SWR (300-ohms) Under 2.4

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c) AWG6 Elements + 1/4" 15x Reflector Rods (Search across ALL SIX Variables):

UHF Raw Gain = 9.6 to 10.4 to 10.3 dBi, F/B & F/R Minimum = 19.6 dB and SWR (300-ohms) Under 1.8.

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d) AWG12 Elements + AWG12 15xReflector Rods:

UHF Raw Gain = 9.4 to 10.2 dBi, F/B & F/R Minimum = 17.1 dB and SWR (300-ohms) Under 1.8.

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e) Grid Mesh 24x19.5-in (per 300-ohm post):

UHF Raw Gain = 9.4-10.8 dBi with SWR under 2.4, using AWG6.
Front/Back and Front/Rear Ratios 15 dB or better.

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f) Grid Mesh 24x19.5-in (Re-Optimized using nikiml's Python scripts):

UHF Raw Gain = 9.5-10.6 dBi with SWR under 2.5, using AWG6.
Front/Back and Front/Rear Ratios 17 dB or better.

PS: For improved F/B and F/R Ratios, should try different Grid Mesh sizes.

EDIT (10Dec2012): Added 4nec2 analysis with Grid Mesh (per 300ohm post) and
Re-Optimized version, with somewhat better F/B and F/R Ratios.

EDIT (10Jul2014): Replaced 15xRR version with improved SWR version (with 0.2 drop in Gain).

EDIT (8Mar2015): Added 11RR version.

Date(s): 30 Nov 2012. Album by holl_ands. 1 - 81 of 81 Total. 13892 Visits.

enlarge 65KB, 646x1024 1 UHF Hourglass Loop - No Reflector 3D View	enlarge 234KB, 847x1024 2 UHF Hourglass Loop - No Reflector Front View - AWG-10 Version Total Height = 13.0-in, Width = 10.25-in, Feedpoint Gap=3.0-in, Diagonals = 7.5-in [1 big box = 1.25 inches]	enlarge 28KB, 791x1024 3 UHF Hourglass Loop - No Reflector 4nec2 File - oneolddude's modified
enlarge 175KB, 1152x692 4 UHF Hourglass Loop - No Reflector UHF Raw Gain = 4.7 to 5.9 dBi	enlarge 208KB, 1152x692 5 UHF Hourglass Loop - No Reflector UHF SWR (300-ohms) Under 2.0	enlarge 246KB, 1152x692 6 UHF Hourglass Loop - No Reflector UHF Impedance
enlarge 316KB, 1024x1024 7 UHF Hourglass Loop - No Reflector Azimuthal Pattern at 470 MHz	enlarge 317KB, 1024x1024 8 UHF Hourglass Loop - No Reflector Azimuthal Pattern at 590 MHz	enlarge 319KB, 1024x1024 9 UHF Hourglass Loop - No Reflector Azimuthal Pattern at 698 MHz
enlarge 311KB, 1024x1024 10 UHF Hourglass Loop - No Reflector Azimuthal Pattern at 758 MHz	enlarge 309KB, 1024x1024 11 UHF Hourglass Loop - No Reflector Azimuthal Pattern at 806 MHz	enlarge 22KB, 791x1024 12 UHF Hourglass Loop - No Reflector Python Optimization Control *.bat file
enlarge 148KB, 1024x690 13 UHF Hourglass Loop - No Reflector Hi-VHF Raw Gain - 3.8 to 3.9 dBi	enlarge 182KB, 1024x690 14 UHF Hourglass Loop - No Reflector Hi-VHF SWR (300-ohms) = 222 to 62 is Excessive	enlarge 224KB, 1024x690 15 UHF Hourglass Loop - No Reflector Hi-VHF Impedance
enlarge 315KB, 1024x1024 16	enlarge 314KB, 1024x1024 17	enlarge 318KB, 1024x1024 18
enlarge 121KB, 884x1024 19 UHF Hourglass Loop - 11 Reflector Rods 3D View - AWG10 & 1/4" RR Version	enlarge 290KB, 1015x1024 20 UHF Hourglass Loop - 11 Reflector Rods Front View - AWG10 & 1/4" RR Version Hourglass Height = 12.5-in, Width = 10.125-in, Feedpoint Gap=2.5-in. Overall Height with Refl Rods= 20.0-in. [1 big box = 2.5 inches]	enlarge 138KB, 552x1024 21 UHF Hourglass Loop - 11 Reflector Rods Top View - AWG6 & 1/4" RR Version Refl Rod Length = 21.0-in, Rod-to-Rod Separation=2.0-in, Rods-to-Hourglass Separation=4.0-in. [1 big box = 2.5 inches]
enlarge 180KB, 1024x741 22 UHF Hourglass Loop - 11 Reflector Rods USB Raw Gain = 9.3 to 10.3 dBi USB F/B & F/R Ratio = 19.4 dB	enlarge 184KB, 1024x741 23 UHF Hourglass Loop - 11 Reflector Rods USB SWR (300-ohms) Under 2.4	enlarge 227KB, 1024x741 24 UHF Hourglass Loop - 11 Reflector Rods USB Impedance
enlarge 298KB, 1024x1024 25 UHF Hourglass Loop - 11 Reflector Rods Azimuthal Pattern at 470 MHz	enlarge 298KB, 1024x1024 26 UHF Hourglass Loop - 11 Reflector Rods Azimuthal Pattern at 530 MHz	enlarge 298KB, 1024x1024 27 UHF Hourglass Loop - 11 Reflector Rods Azimuthal Pattern at 590 MHz
enlarge 298KB, 1024x1024 28 UHF Hourglass Loop - 11 Reflector Rods Azimuthal Pattern at 650 MHz	enlarge 304KB, 1024x1024 29 UHF Hourglass Loop - 11 Reflector Rods Azimuthal Pattern at 698 MHz	enlarge 299KB, 1024x1024 30 UHF Hourglass Loop - 11 Reflector Rods Azimuthal Pattern at 758 MHz
enlarge 300KB, 1024x1024 31 UHF Hourglass Loop - 11 Reflector Rods Azimuthal Pattern at 806 MHz	enlarge 30KB, 791x1024 32 UHF Hourglass Loop - 11 Reflector Rods 4nec2 File Contains Summary of Dimensions	enlarge 143KB, 549x1024 33 UHF Hourglass Loop - 11 Reflector Rods Side View - AWG6 & 1/4" RR Version Rod-to-Rod Separation=2.0-in, Rods-to-Hourglass Separation=4.0-in. [1 big box = 2.5 inches]
enlarge 175KB, 1024x741 34 UHF Hourglass Loop - 11 Reflector Rods Hi-VHF Raw Gain TO REAR = 5.9 to -1.9 dBi Hi-VHF F/B & F/R Ratio = 0.3 to -8.2 dB MORE GAIN TO REAR	enlarge 167KB, 1024x741 35 UHF Hourglass Loop - 11 Reflector Rods USB Raw Gain FORWARD = 5.6 to 6.3 dBi	enlarge 188KB, 1024x741 36 UHF Hourglass Loop - 11 Reflector Rods USB SWR (300-ohms) = 1471 to 332 is Excessive
enlarge 308KB, 1024x1024 37 UHF Hourglass Loop - 11 Reflector Rods Azimuthal Pattern at 174 MHz	enlarge 305KB, 1024x1024 38 UHF Hourglass Loop - 11 Reflector Rods Azimuthal Pattern at 198 MHz	enlarge 307KB, 1024x1024 39 UHF Hourglass Loop - 11 Reflector Rods Azimuthal Pattern at 216 MHz
enlarge 117KB, 744x1024 40 UHF Hourglass Loop - 15 Reflector Rods 3D View - AWG6 & 1/4" RR Version	enlarge 302KB, 1024x1018 41 UHF Hourglass Loop - 15 Reflector Rods Front View - AWG6 & 1/4" RR Version Hourglass Height = 12.75-in, Width = 9.75-in, Feedpoint Gap=2.75-in, Diagonals = 7.22-in. Overall Height with Refl Rods= 24.75-in. [1 big box = 2.5 inches]	enlarge 134KB, 498x1024 42 UHF Hourglass Loop - 15 Reflector Rods Side View - AWG6 & 1/4" RR Version Refl Rod Length = 21.0-in, Rod-to-Rod Separation=1.75-in, Rods-to-Hourglass Separation=4.5-in. [1 big box = 2.5 inches]
enlarge 175KB, 1024x675 43 UHF Hourglass Loop - 15 Reflector Rods AWG6 & 1/4" RR Version UHF Raw Gain = 9.6 to 10.4 to 10.3 dBi UHF F/B & F/R Minimum = 19.6 dB	enlarge 190KB, 1024x675 44 UHF Hourglass Loop - 15 Reflector Rods AWG6 & 1/4" RR Version UHF SWR (300-ohms) Under 1.8	enlarge 222KB, 1024x675 45 UHF Hourglass Loop - 15 Reflector Rods AWG6 & 1/4" RR Version UHF Impedance
enlarge 178KB, 1024x675 46 UHF Hourglass Loop - 15 Reflector Rods AWG12 & AWG12 RR Version UHF Raw Gain = 9.4 to 10.2 dBi UHF F/B & F/R Minimum = 17.1 dB	enlarge 192KB, 1024x675 47 UHF Hourglass Loop - 15 Reflector Rods AWG12 & AWG12 RR Version UHF SWR (300-ohms) Under 1.8	enlarge 220KB, 1024x675 48 UHF Hourglass Loop - 15 Reflector Rods AWG12 & AWG12 RR Version UHF Impedance
enlarge 300KB, 1024x1024 49 UHF Hourglass Loop - 15 Reflector Rods AWG6 & 1/4" RR Version Azimuthal Pattern at 470 MHz	enlarge 300KB, 1024x1024 50 UHF Hourglass Loop - 15 Reflector Rods AWG6 & 1/4" RR Version Azimuthal Pattern at 530 MHz	enlarge 300KB, 1024x1024 51 UHF Hourglass Loop - 15 Reflector Rods AWG6 & 1/4" RR Version Azimuthal Pattern at 590 MHz
enlarge 300KB, 1024x1024 52 UHF Hourglass Loop - 15 Reflector Rods AWG6 & 1/4" RR Version Azimuthal Pattern at 650 MHz	enlarge 299KB, 1024x1024 53 UHF Hourglass Loop - 15 Reflector Rods AWG6 & 1/4" RR Version Azimuthal Pattern at 698 MHz	enlarge 302KB, 1024x1024 54 UHF Hourglass Loop - 15 Reflector Rods AWG6 & 1/4" RR Version Azimuthal Pattern at 758 MHz
enlarge 299KB, 1024x1024 55 UHF Hourglass Loop - 15 Reflector Rods AWG6 & 1/4" RR Version Azimuthal Pattern at 806 MHz	enlarge 29KB, 791x1024 56 UHF Hourglass Loop - 15 Reflector Rods AWG6 & 1/4" RR Version 4nec2 File [May change to 0.0404 for AWG12]	enlarge 145KB, 578x1024 57 UHF Hourglass Loop - 15 Reflector Rods Side View - AWG6 & 1/4" RR Version Refl Rod Length = 21.0-in, Hourglass Width=9.75-in, Rods-to-Hourglass Separation=4.5-in. [1 big box = 2.5 inches]
enlarge 133KB, 760x1024 58 UHF Hourglass Loop - 24x19.5-in Grid Reflector 3D View	enlarge 305KB, 830x1024 59 UHF Hourglass Loop - 24x19.5-in Grid Reflector Front View - AWG-10 Version Hourglass Height = 13.5-in, Width = 8.5-in, Feedpoint Gap=3.75-in, Diagonals = 7.15-in. Grid Reflector Height = 24.0-in, Width = 19.5-in. Grid Size = 1.5-in x 1.5-in.	enlarge 84KB, 296x1024 60 UHF Hourglass Loop - 24x19.5-in Grid Reflector Side View Reflector-to-Hourglass Separation = 3.75-in. [1 big box = 2.5 inches]
enlarge 192KB, 1152x692 61 UHF Hourglass Loop - 24x19.5-in Grid Reflector UHF Raw Gain = 9.3 to 10.9 dBi Note lower F/B and F/R Ratios than 15 Refl Rods	enlarge 198KB, 1152x692 62 UHF Hourglass Loop - 24x19.5-in Grid Reflector UHF SWR (300-ohms) Under 2.4	enlarge 247KB, 1152x692 63 UHF Hourglass Loop - 24x19.5-in Grid Reflector UHF Impedance
enlarge 302KB, 1024x1024 64 UHF Hourglass Loop - 24x19.5-in Grid Reflector Azimuthal Pattern at 470 MHz	enlarge 301KB, 1024x1024 65 UHF Hourglass Loop - 24x19.5-in Grid Reflector Azimuthal Pattern at 590 MHz	enlarge 302KB, 1024x1024 66 UHF Hourglass Loop - 24x19.5-in Grid Reflector Azimuthal Pattern at 698 MHz
enlarge 303KB, 1024x1024 67 UHF Hourglass Loop - 24x19.5-in Grid Reflector Azimuthal Pattern at 758 MHz	enlarge 300KB, 1024x1024 68 UHF Hourglass Loop - 24x19.5-in Grid Reflector Azimuthal Pattern at 806 MHz	enlarge 56KB, 791x1024 69 UHF Hourglass Loop - 24x19.5-in Grid Reflector 4nec2 File - 300ohm's modified
enlarge 141KB, 663x1024 70 UHF Hourglass Loop - 24x19.5-in Grid Reflector Re-Optimized 3D View	enlarge 309KB, 841x1024 71 UHF Hourglass Loop - 24x19.5-in Grid Reflector Re-Optimized AWG-10 - Front View Hourglass Height = 14.5-in, Width = 10.75-in, Feedpoint Gap=2.75-in, Diagonals = 8.25-in. Grid Reflector Height = 24.0-in, Width = 19.5-in. Grid Size = 1.5-in x 1.5-in.	enlarge 77KB, 259x1024 72 UHF Hourglass Loop - 24x19.5-in Grid Reflector Re-Optimized - Side View Reflector-to-Hourglass Separation = 3.5-in. [1 big box = 2.5 inches]
enlarge 187KB, 1152x692 73 UHF Hourglass Loop - 24x19.5-in Grid Reflector Re-Optimized UHF Raw Gain = 9.4 to 10.6 dBi (only 0.3 db less) F/B and F/R Ratios improved to 17 dB or higher	enlarge 201KB, 1152x692 74 UHF Hourglass Loop - 24x19.5-in Grid Reflector Re-Optimized UHF SWR (300-ohms) Under 2.5	enlarge 250KB, 1152x692 75 UHF Hourglass Loop - 24x19.5-in Grid Reflector Re-Optimized UHF Impedance
enlarge 301KB, 1024x1024 76 UHF Hourglass Loop - 24x19.5-in Grid Reflector Re-Optimized Azimuthal Pattern at 470 MHz	enlarge 301KB, 1024x1024 77 UHF Hourglass Loop - 24x19.5-in Grid Reflector Re-Optimized Azimuthal Pattern at 590 MHz	enlarge 303KB, 1024x1024 78 UHF Hourglass Loop - 24x19.5-in Grid Reflector Re-Optimized Azimuthal Pattern at 698 MHz
enlarge 302KB, 1024x1024 79 UHF Hourglass Loop - 24x19.5-in Grid Reflector Re-Optimized Azimuthal Pattern at 758 MHz	enlarge 300KB, 1024x1024 80 UHF Hourglass Loop - 24x19.5-in Grid Reflector Re-Optimized Azimuthal Pattern at 806 MHz	enlarge 55KB, 791x1024 81 UHF Hourglass Loop - 24x19.5-in Grid Reflector Re-Optimized 4nec2 File - Hourglass & Separation Re-optimized

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Great Information.
Best bon anniversaire.
- Simon, Sat, 18 Mar 2023 10:30AM