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holl_ands | Home > Multi-Bay Bowtie Antennas > UHF 4-Bay Bowties - NO Reflectors > Browse:NEW-UHF Free-Form 4-Bay + NoReflComparison Charts: 4-Bay - NO ReflectorsUHF Free-Form 4-Bay Bowtie - NO Reflmclapp's M4 (10.0x9.5) 4-Bay - NO Refl.UHF Kosmic SuperQuad (9.75x9.5) NO Refl.mclapp's M4 (9.5x9.0) 4-Bay - NO Refl.mclapp M4 (9.5x9.0x8.5) 4-Bay - NO ReflUHF CM4221HD (Hacked) - No ReflectorCM4221 Actual Measurements - if NO ReflCM4221a.ez 4-Bay Bowtie - if NO ReflAntennacraft U-4000 - NO Reflector A-D DB-4 4-Bay Bowtie NO ReflectorUTube 4-Bay Bowtie - NO Reflector
UHF Free-Form 4-Bay Bowtie - NO Refl UHF Free Form 4-Bay Bowtie (FF4 - NO Reflector) analyzed using 4nec2 after using nikiml's Python Optimization Scripts to determine "best" dimensions for UHF (Only).  Essentially ALL parameters were allowed to independently vary over a wide range of values in the Optimization. Height=38.4-inches, Width=26.8-inches. ONLY Constraints were Element & Feedline Radius (AWG10), Conductivity (Copper), "Hop=1-in" Wire Separation at the Feedline Crossover point, same Feedline Separation Top-to-Bottom, NO Forward Sweep in the (FLAT) Bowties and Left/Right plus Top/Bottom Symmetry, allowing different Inner & Outer Bowties. UHF Raw Gain = 9.7 to 12.6 dBi and SWR (300-ohms) under 2.6. Hi-VHF Raw Gain = 3.5 dBi and SWR (300-ohms) = 2.2 to 3.9 [A bit Excessive except Ch7-8.] ASSUMED DIMENSIONS (All in inches): Rbow=0.051 = AWG10 Element Wire size [AWG12 thru AWG8 are also good] Rfeed=0.051 = AWG10 Feedline Wire size [AWG12 thru AWG8 are also good] Hop=1.0 = X-Axis Separation at Crossover OPTIMIZED DIMENSIONS (All in inches, may round to nearest 1/8-in): ZBowII=12.57 = Distance between the Centers of the two INNER Bowties ZBowOI=9.86 = From Center of INNER Bowtie to Center of OUTER Bowtie BowLeni=11.60 = INNER Bow Whisker Length (lose some in bend) BowLeno=8.01 = OUTER Bow Whisker Length (lose some in bend) TineSepi=6.61 = INNER Bow Tine Separation TineSepo=6.14 = OUTER Bow Tine Separation FeedSep=4.39 = Separation between two FEEDLINE wires ZCross=1.25 = From Center of Feedline Cross-Over to Center of OUTER Bowtie Date(s): 2 Nov 2013. Album by holl_ands. 1 - 22 of 22 Total. 7307 Visits.
enlarge 72KB, 721x1024 1 UHF Free-Form 4-Bay Bowtie - NO Refl 3D View enlarge 197KB, 710x1024 2 UHF Free-Form 4-Bay Bowtie - NO Refl Front View [1 large square = 5-inches] enlarge 70KB, 231x1024 3 UHF Free-Form 4-Bay Bowtie - NO Refl Top View [1 large square = 2.5-inches] enlarge 160KB, 1152x686 4 UHF Free-Form 4-Bay Bowtie - NO Refl UHF Raw Gain = 9.7 to 12.6 dBi enlarge 190KB, 1152x686 5 UHF Free-Form 4-Bay Bowtie - NO Refl UHF SWR (300-ohms) Under 2.6 enlarge 248KB, 1152x686 6 UHF Free-Form 4-Bay Bowtie - NO Refl UHF Impedance enlarge 312KB, 1024x1024 7 UHF Free-Form 4-Bay Bowtie - NO Refl Azimuthal Pattern at 470 MHz enlarge 311KB, 1024x1024 8 UHF Free-Form 4-Bay Bowtie - NO Refl Azimuthal Pattern at 530 MHz enlarge 308KB, 1024x1024 9 UHF Free-Form 4-Bay Bowtie - NO Refl Azimuthal Pattern at 590 MHz enlarge 311KB, 1024x1024 10 UHF Free-Form 4-Bay Bowtie - NO Refl Azimuthal Pattern at 650 MHz enlarge 313KB, 1024x1024 11 UHF Free-Form 4-Bay Bowtie - NO Refl Azimuthal Pattern at 698 MHz enlarge 315KB, 1024x1024 12 UHF Free-Form 4-Bay Bowtie - NO Refl Azimuthal Pattern at 758 MHz enlarge 312KB, 1024x1024 13 UHF Free-Form 4-Bay Bowtie - NO Refl Azimuthal Pattern at 806 MHz enlarge 34KB, 791x1024 14 UHF Free-Form 4-Bay Bowtie - NO Refl 4nec2 File enlarge 81KB, 317x1024 15 UHF Free-Form 4-Bay Bowtie - NO Refl Side View [1 large square = 5-inches] enlarge 172KB, 1152x686 16 UHF Free-Form 4-Bay Bowtie - NO Refl Hi-VHF Raw Gain = 3.5 dBi enlarge 211KB, 1152x686 17 UHF Free-Form 4-Bay Bowtie - NO Refl Hi-VHF SWR (300-ohms) 2.2 - 3.9 A bit Excessive except Ch7-8. enlarge 232KB, 1152x686 18 UHF Free-Form 4-Bay Bowtie - NO Refl Hi-VHF Impedance enlarge 319KB, 1024x1024 19 UHF Free-Form 4-Bay Bowtie - NO Refl Azimuthal Pattern at 174 MHz enlarge 319KB, 1024x1024 20 UHF Free-Form 4-Bay Bowtie - NO Refl Azimuthal Pattern at 198 MHz enlarge 323KB, 1024x1024 21 UHF Free-Form 4-Bay Bowtie - NO Refl Azimuthal Pattern at 216 MHz enlarge 22KB, 791x1024 22 UHF Free-Form 4-Bay Bowtie - NO Refl Contents of Python Control Script *.bat File
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