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Public Gallery>holl_ands>Arts and Crafts>Browse:Holiday Special Boba FettMohouli Fractured Airscapes 2021Steam engine from stock materialsPortraits 2019 & 20204th entry of sermon sketchesThis is itMore Pour - 2017Art Journal/ Mixed MediaAurora ArtGlass Art Lampwork BeadsBrea's Glass and Metal StudioThe Antonyo Series - 2019 &2020Mohouli AirscapesA CRAZY LITTLE CHRISTMAS - 2020Found On Selro Corp JewelryUHF H2 2-Bay Bowties + Screen ReflectorJohn E. Keller PaintingsStyles Subject To Establishing ProofHilo Airscapes -2016The Jacko Series - 2020Mohouli Sgrafitto 2021

UHF H2 2-Bay Bowties + Screen Reflector Slideshow UHF H2 2-Bay Bowtie with Screen Grid Reflector Analyzed using 4nec2 after determining OPTIMUM Dimensions using nikiml's Python Optimization Scrips.  Performance is significantly better than ANY other 2-Bay Bowtie. Two versions are Optimized and Analyzed....the second clearly outperforming the first: a) H2 (9.5"x12") 2-Bay Bowtie with 24"Hx24"W Screen Reflector (Grid=2"Hx4"W), with Hi-VHF Gain to REAR on lower Channels: UHF Raw Gain = 10.3 to 13.6 dBi, F/B & F/R Ratio Min. = 15.4 dB and SWR (300-ohms) under 2.3. Hi-VHF Raw Gain = -2 to 8 dBi FORWARD and to REAR Raw Gain = 6.9 to 7.3 to 2.5 dBi with Hi-VHF F/B & F/R = 10 to -5 dB and SWR (300-ohms) = 125 to 60.8. Dimensions (inches): BowLen = 9.5 = Bowtie Whisker Half-Length, ZBowII = 12.0 = Distance between the Centers of the two Bowties, TineSep = 8.25 = Bowtie Tine Separation, BowSwp=0.0 = Bowtie Forward Sweep, FedSep = 1.75 = Separation (in inches) between two FEEDLINE wires, RS = -4.75 = Separation between Bowties and Reflector. Screen Reflector = 24-in H x 24-in W, 2"Hx4"W Grid (1"Hx2"W would improve F/B & F/R Ratios). ====================================== b) H2 (10"x15") 2-Bay Bowtie with 36"Hx36"W Screen Reflector (Grid=1"Hx2"W), with significantly higher UHF Gain and more Hi-VHF Gain aligned FORWARD: UHF Raw Gain = 12.9 to 14.5 dBi, F/B & F/R Ratio Min = 22.5 dB and SWR (300-ohms) Under 2.8. Hi-VHF Raw Gain = 8.2 to 8.6 dBi, F/B & F/R Ratio = 9.8 to 15.9 dB and SWR (300-ohms) = 93 to 31 is Excessive. Dimensions: (inches) BowLen = 10.0 = Bowtie Whisker Half-Length, ZBowII = 15.0 = Distance between the Centers of the two Bowties, TineSep = 10.0 = Bowtie Tine Separation, BowSwp=0.0 = Bowtie Forward Sweep, FedSep = 2.75 = Separation (in inches) between two FEEDLINE wires, RS = -5.0 = Separation between Bowties and Reflector. Screen Reflector = 36-in H x 36-in W, 1"Hx2"W Grid. 9 Feb 201542 Images27273 visitsAlbum by holl_ands

enlarge 148KB, 761x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W 3D View enlarge 330KB, 1015x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Front View [1 large square = 2.5 inches] enlarge 136KB, 506x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Top View [1 large square = 2.5 inches] enlarge 182KB, 1024x741 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W UHF Raw Gain = 10.3 to 13.6 dBi UHF F/B & F/R Ratio Minimum = 15.4 dB enlarge 185KB, 1024x741 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W UHF SWR (300-ohms) Under 2.3 enlarge 227KB, 1024x741 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W UHF Impedance enlarge 301KB, 1024x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Azimuthal Pattern at 470 MHz enlarge 302KB, 1024x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Azimuthal Pattern at 530 MHz enlarge 302KB, 1024x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Azimuthal Pattern at 590 MHz enlarge 304KB, 1024x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Azimuthal Pattern at 650 MHz enlarge 305KB, 1024x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Azimuthal Pattern at 698 MHz enlarge 303KB, 1024x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Azimuthal Pattern at 758 MHz enlarge 305KB, 1024x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Azimuthal Pattern at 806 MHz enlarge 40KB, 791x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W 4nec2 File Contains Dimensions enlarge 136KB, 499x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Side View [1 large square = 2.5 inches] enlarge 113KB, 1152x497 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Hi-VHF Raw Gain = -2 to 8 dBi FORWARD enlarge 169KB, 1024x741 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Hi-VHF Raw Gain = 6.9 to 7.3 to 2.5 dBi MORE TO REAR on Lower Channels Hi-VHF F/B & F/R 10 to -5 dB enlarge 192KB, 1024x741 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Hi-VHF SWR (300-ohms) = 125 to 60.8 enlarge 305KB, 1024x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Azimuthal Pattern at 174 MHz More Gain to REAR on Lower Channels enlarge 313KB, 1024x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Azimuthal Pattern at 198 MHz Bi-Directional Mid-Band enlarge 308KB, 1024x1024 UHF H2-Bay (9.5"Hx12"W) Bowtie plus Screen Reflector (24"Hx24"W), Grid=2"Hx4"W Azimuthal Pattern at 216 MHz More Gain FORWARD on Higher Channels enlarge 244KB, 1007x1024 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W 3D View enlarge 399KB, 1024x886 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W Front View [1 large square = 2.5 inches] enlarge 137KB, 448x1024 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W Top View [1 large square = 2.5 inches] enlarge 178KB, 1024x722 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W UHF Raw Gain = 12.9 to 14.5 dBi UHF F/B & F/R Ratio Min = 22.5 dB enlarge 184KB, 1024x722 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W UHF SWR (300-ohms) Under 2.8 enlarge 232KB, 1024x722 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W UHF Impedance enlarge 301KB, 1024x1024 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W Azimuthal Pattern = 470 MHz enlarge 300KB, 1024x1024 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W Azimuthal Pattern = 530 MHz enlarge 300KB, 1024x1024 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W Azimuthal Pattern = 590 MHz enlarge 299KB, 1024x1024 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W) Azimuthal Pattern = 650 MHz enlarge 300KB, 1024x1024 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W Azimuthal Pattern = 698 MHz enlarge 302KB, 1024x1024 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W Azimuthal Pattern = 806 MHz enlarge 168KB, 1024x722 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W Hi-VHF Raw Gain = 8.2 to 8.6 dBi Hi-VHF F/B & F/R Ratio = 9.8 to 15.9 dB enlarge 190KB, 1024x722 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W Hi-VHF SWR (300-ohms) = 93 to 31 is Excessive enlarge 218KB, 1024x722 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W Hi-VHF Impedance enlarge 294KB, 1024x1024 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W Azimuthal Pattern = 174 MHz enlarge 293KB, 1024x1024 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W Azimuthal Pattern = 198 MHz enlarge 297KB, 1024x1024 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W Azimuthal Pattern = 216 MHz enlarge 112KB, 791x1024 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W 4nec2 File Includes Summary of Dimensions enlarge 26KB, 791x1024 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W EVAL Summary of Performance enlarge 76KB, 791x1024 UHF H2-Bay (10"Hx15"W) Bowtie plus Screen Reflector (36"Hx36"W), Grid=1"Hx2"W EVAL *.html Performance Summary