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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 2Bay-In-DualRectLoop - OPT Hi-VHF+UHF 2-Bay Bowtie Inside Dual-Rectangular-Loop (NO Reflector) analyzed using 4nec2. UHF Raw Gain = 6.7 to 9.4 to 4.6 dBi drops off on higher Channels and SWR (150-ohms) under 3.3, a bit high. Hi-VHF Raw Gain = 4.3 to 4.6 dBi and SWR (150-ohms) under 2.5.  [Excellent} SWR (300-ohms) in both Bands is excessive.  If the usual 300-to-75-ohm (4:1) Balun Transformer is replaced with a 150-to-75-ohm (2:1) Transformer, SWR is greatly improved.  Although a special order item, 2:1 Transformers are available (try for example Mohawk and Allied), including following MiniCircuits p/n's: JTX-2-10T and TX-2-5. More info re 2:1, 2.25:1 and other Baluns: http://www.highfrequencyelectronics.com/Archives/Nov04/HFE1104_Sevick.pdf Date(s): 11 Nov 2013. Album by holl_ands. 1 - 23 of 23 Total. 1135 Visits.
enlarge 74KB, 653x1024 1 2Bay-In-Dual-Rectangular-Loop 3D View enlarge 237KB, 686x1024 2 2Bay-In-Dual-Rectangular-Loop Front View [1 large square = 2.5 inches] enlarge 30KB, 791x1024 3 2Bay-In-Dual-Rectangular-Loop 4nec2 File enlarge 176KB, 1152x691 4 2Bay-In-Dual-Rectangular-Loop UHF Raw Gain = 6.7 to 9.4 to 4.6 dBi drops off on higher Channels enlarge 206KB, 1152x691 5 2Bay-In-Dual-Rectangular-Loop UHF SWR (150-ohms) Under 3.3 is just a bit high enlarge 204KB, 1152x691 6 2Bay-In-Dual-Rectangular-Loop UHF SWR (300-ohms) Under 5.9 is Excessive enlarge 301KB, 1024x1024 7 2Bay-In-Dual-Rectangular-Loop Elevation Pattern at 470 MHz points slightly UPWARDS enlarge 298KB, 1024x1024 8 2Bay-In-Dual-Rectangular-Loop Elevation Pattern at 590 MHz points toward Horizon enlarge 304KB, 1024x1024 9 2Bay-In-Dual-Rectangular-Loop Elevation Pattern at 674 MHz points slightly UPWARDS enlarge 305KB, 1024x1024 10 2Bay-In-Dual-Rectangular-Loop Azimuthal Pattern at 470 MHz enlarge 305KB, 1024x1024 11 2Bay-In-Dual-Rectangular-Loop Azimuthal Pattern at 530 MHz enlarge 308KB, 1024x1024 12 2Bay-In-Dual-Rectangular-Loop Azimuthal Pattern at 590 MHz enlarge 307KB, 1024x1024 13 2Bay-In-Dual-Rectangular-Loop Azimuthal Pattern at 650 MHz enlarge 304KB, 1024x1024 14 2Bay-In-Dual-Rectangular-Loop Azimuthal Pattern at 698 MHz enlarge 298KB, 1024x1024 15 2Bay-In-Dual-Rectangular-Loop Azimuthal Pattern at 758 MHz enlarge 183KB, 1152x691 16 2Bay-In-Dual-Rectangular-Loop Hi-VHF Raw Gain = 4.3 to 4.6 dBi enlarge 220KB, 1152x691 17 2Bay-In-Dual-Rectangular-Loop Hi-VHF SWR (300-ohms) Under 2.5 enlarge 208KB, 1152x691 18 2Bay-In-Dual-Rectangular-Loop Hi-VHF SWR (300-ohms) Under 4.8 is Excessive enlarge 314KB, 1024x1024 19 2Bay-In-Dual-Rectangular-Loop Azimuthal Pattern at 174 MHz enlarge 305KB, 1024x1024 20 2Bay-In-Dual-Rectangular-Loop Azimuthal Pattern at 198 MHz enlarge 307KB, 1024x1024 21 2Bay-In-Dual-Rectangular-Loop Azimuthal Pattern at 216 MHz enlarge 22KB, 791x1024 22 2Bay-In-Dual-Rectangular-Loop 4nec2 File enlarge 22KB, 791x1024 23 Save_Population_For_Restart *.bat Contents [Can manually execute every few hours.]
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