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holl_ands | Home > Loop Antennas incl Folded Dipole > Hi-VHF+UHF In 3-ftx2-ft Picture Frame > Browse:H+U 2Sq-Centipede-In-BoxedTwinRectLoopHiVHF+UHF 2SqCentipede-In-RectLoop - OPTHiVHF+UHF 2Sq-Chireix-In-BoxedRectLoopHiVHF+UHF M4 (9.5x9) Bowtie-In-RectLoopHiVHF+UHF M2 (9.5x9) Bowtie-In-RectLoopHiVHF+UHF 4Antlers-In-TwinRectLoop - OPTHiVHF+UHF 2Sq-Chireix-In-RectLoop - OPTHiVHF+UHF 2Bay-In-DualRectLoop - OPTHiVHF+UHF Hourglass-Loop In DualRectLoopHiVHF+UHF Bowtie-In-DualRectLoop - OPTHi-VHF (+UHF) Twin Rectangular Loops
HiVHF+UHF Bowtie-In-DualRectLoop - OPT Hi-VHF + UHF Bowtie Inside Dual (Unequal) Rectangular (36-in H x 24-in W) Loop analyzed using 4nec2.  The Whisker Length, Angle and Z-Coordinate location of the Bowtie was allowed to vary as part of nikiml Python Script Optimization. UHF Raw Gain Between 2.0 and 3.1 and SWR under 2.9. Hi-VHF Raw Gain =2.5 to 4.5 dBi and SWR under 3.9 (a bit high). Although low Gain, Wide Beamwidth can be useful if Picture Frame can not be aimed as needed. An Elevation Plot revealed that the Gain Pattern was slightly more in the up or down direction at different frequencies, with the largest difference occurring mid-band in the UP direction when Bowtie was ABOVE the mid-line (as shown). Date(s): 11 Nov 2013. Album by holl_ands. 1 - 23 of 23 Total. 1734 Visits.
enlarge 61KB, 710x1024 1 Bowtie-In-Dual-Rectangular-Loop 3D View enlarge 221KB, 686x1024 2 Bowtie-In-Dual-Rectangular-Loop Front View [1 large square = 2.5 inches] enlarge 28KB, 791x1024 3 Bowtie-In-Dual-Rectangular-Loop 4nec2 File enlarge 193KB, 1152x691 4 Bowtie-In-Dual-Rectangular-Loop UHF Raw Gain Between 2.0 and 3.1 but with Wide Beamwidth enlarge 202KB, 1152x691 5 Bowtie-In-Dual-Rectangular-Loop UHF SWR (300-ohms) Under 2.9 enlarge 245KB, 1152x691 6 Bowtie-In-Dual-Rectangular-Loop UHF Impedance enlarge 305KB, 1024x1024 7 Bowtie-In-Dual-Rectangular-Loop Elevation Pattern at 470 MHz Showing Significant DOWN Pattern enlarge 293KB, 1024x1024 8 Bowtie-In-Dual-Rectangular-Loop Elevation Pattern at 578 MHz Showing Significant UP Pattern enlarge 298KB, 1024x1024 9 Bowtie-In-Dual-Rectangular-Loop Elevation Pattern at 698 MHz Showing Significant UP Pattern enlarge 309KB, 1024x1024 10 Bowtie-In-Dual-Rectangular-Loop Azimuthal Pattern at 470 MHz enlarge 310KB, 1024x1024 11 Bowtie-In-Dual-Rectangular-Loop Azimuthal Pattern at 530 MHz enlarge 307KB, 1024x1024 12 Bowtie-In-Dual-Rectangular-Loop Azimuthal Pattern at 590 MHz enlarge 302KB, 1024x1024 13 Bowtie-In-Dual-Rectangular-Loop Azimuthal Pattern at 650 MHz enlarge 302KB, 1024x1024 14 Bowtie-In-Dual-Rectangular-Loop Azimuthal Pattern at 698 MHz enlarge 308KB, 1024x1024 15 Bowtie-In-Dual-Rectangular-Loop Azimuthal Pattern at 806 MHz enlarge 178KB, 1152x691 16 Bowtie-In-Dual-Rectangular-Loop Hi-VHF Raw Gain =2.5 to 4.5 dBi but with Very Wide Beamwidth enlarge 208KB, 1152x691 17 Bowtie-In-Dual-Rectangular-Loop Hi-VHF SWR (300-ohms) = 2.3 to 3.9 is a bit high on the higher channels enlarge 244KB, 1152x691 18 Bowtie-In-Dual-Rectangle-Loop Hi-VHF Impedance enlarge 314KB, 1024x1024 19 Bowtie-In-Dual-Rectangular-Loop Azimuthal Pattern at 174 MHz enlarge 308KB, 1024x1024 20 Bowtie-In-Dual-Rectangular-Loop Azimuthal Pattern at 198 MHz enlarge 309KB, 1024x1024 21 Bowtie-In-Dual-Rectangular-Loop Azimuthal Pattern at 216 MHz enlarge 22KB, 791x1024 22 Bowtie-In-Dual-Rectangular-Loop Contents of Python Script *.bat text File enlarge 22KB, 791x1024 23 Save_Population_For_Restart *.bat Contents [Can manually execute every few hours.]
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