UHF Horizontal 4-Bay (H4), 2x2-Bay Bowtie (NO Reflector) Antennas analyzed using 4nec2. Except for Bowtie Sweep = 0, ALL of the fol. parameters were allowed to vary in nikiml's Python Optimization scripts.
Note that H4 2x2-Bay had about 0.5 dB higher Raw Gain, narrower Beamwidth & better SWR than M4 4-Bay: http://imageevent.com/holl_ands/multibay/4bay/super4m10x95 [All AWG10 makes very little difference.]
a) UHF H4, 2x2-Bay Bowtie with RF Combiner Mod analyzed using 4nec2. Does NOT include Insertion and Amplitude/Phase Mismatch Loss in Baluns and RF Combiner ("typically" 0.5-1.5+ dB). Note that this presumably "perfect" combiner version provided LESS Gain than the version using a Horizontal Harness and would lose even more in the RF Combiner device.
UHF Raw Gain = 10.0 to 12.7 dBi and SWR (300-ohms) under 2.8. Hi-VHF Raw Gain = 3.1 - 3.8 dBi and SWR (300-ohms) = 30 to 9 (Excessive).
BowLen=10.5-in (AWG10 Elements), BowSep=12.5-in, TineSep=9.25-in, BowSwp=0.0-in. FeedSep=1.0-in (AWG10), Left/Right Bay Separation YBay=20.0" (Center-Center). Baluns connect to center (Simulated) SOURCE Wires in L & R 2-Bays and then to an RF Combiner.
==================================== b) UHF H4, 2x2-Bay Bowtie with Horizontal Harness instead of Two Transmission Lines. Height=20.5-inches, Width=51.2-inches.
UHF Raw Gain = 11.1 to 12.8 dBi and SWR (300-ohms) under 2.3. Hi-VHF Raw Gain Max = 4.1 to 5.0 dBi and SWR (300-ohms) = 7.3 to 5.0 (Excessive).
BowLen=11.25-in (AWG10 Elements), BowSep=12.5-in, TineSep=8.0-in, BowSwp=0.0-in. FeedSep=3.25-in (AWG10), Left/Right Bay Separation YBay=27" (Center-Center). Horizontal Harness Separation between two FEEDLINE wires: FeedSep=3.25-in, From Y=0 to Centerline for each of the two 4-Bays: YBay=27-in.
Date(s): 2 Mar 2013. Album by holl_ands. 1 - 39 of 39 Total. 7244 Visits.
enlarge 79KB, 1024x776 1 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns 3D View
enlarge 202KB, 1152x716 2 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns Front View There is a 0.15-in Gap Between Bowties. [1 big square = 5 inches]
enlarge 44KB, 171x1024 3 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns Side View [1 big square = 2.5 inches]
enlarge 159KB, 1152x692 4 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns UHF Raw Gain = 10.0 to 12.7 dBi
enlarge 213KB, 1152x692 5 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns UHF SWR (300-ohms) Max = 2.8
enlarge 250KB, 1152x692 6 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns UHF Impedance
enlarge 158KB, 1152x692 7 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns Hi-VHF Raw Gain = 3.1 - 3.8 dBi
enlarge 196KB, 1152x692 8 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns Hi-VHF SWR (300-ohms) = 30 to 9 is Excessive
enlarge 235KB, 1152x692 9 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns Hi-VHF Impedance
enlarge 307KB, 1024x1024 10 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns Azimuthal Pattern at 470 MHz
enlarge 310KB, 1024x1024 11 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns Azimuthal Pattern at 530 MHz
enlarge 312KB, 1024x1024 12 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns Azimuthal Pattern at 590 MHz
enlarge 312KB, 1024x1024 13 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns Azimuthal Pattern at 650 MHz
enlarge 314KB, 1024x1024 14 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns Azimuthal Pattern at 698 MHz
enlarge 318KB, 1024x1024 15 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns Azimuthal Pattern at 758 MHz
enlarge 321KB, 1024x1024 16 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns Azimuthal Pattern at 806 MHz
enlarge 41KB, 162x1024 17 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns Top View [1 big square = 5 inches]
enlarge 33KB, 791x1024 18 UHF 2x2-Bay Bowtie - NO Refl Fed with RF Combiner & pair of Baluns 4nec2 File
enlarge 88KB, 799x1024 19 UHF 2x2-Bay Bowtie - NO Refl Horizontal Harness 3D View
enlarge 191KB, 1152x577 20 UHF 2x2-Bay Bowtie - NO Refl Horizontal Harness Front View [1 big square = 5 inches]
enlarge 73KB, 289x1024 21 UHF 2x2-Bay Bowtie - NO Refl Horizontal Harness Side View [1 big square = 2.5 inches]
enlarge 178KB, 1152x692 22 UHF 2x2-Bay Bowtie - NO Refl Horizontal Harness UHF Raw Gain = 11.1 to 12.8 dBi Note small amount of F/B Ratio on lower Channels due to Harness acting as a Reflector.
enlarge 202KB, 1152x692 23 UHF 2x2-Bay Bowtie - NO Refl Horizontal Harness UHF SWR (300-ohms) Max = 2.3
enlarge 166KB, 1152x686 34 UHF 2x2-Bay Bowtie - NO Refl Horizontal Harness Hi-VHF Raw Gain Max = 4.1 to 5.0 dBi Note small amount of F/B Ratio due to Harness acting as a Reflector.
enlarge 201KB, 1152x686 35 UHF 2x2-Bay Bowtie - NO Refl Horizontal Harness Hi-VHF SWR (300-ohms) = 7.3 to 5.0 is Excessive
