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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 2SqCentipede-In-RectLoop - OPT Hi-VHF+UHF 2-Square Centipede Inside Rectangular Loop (NO Reflector) analyzed using 4nec2. UHF Raw Gain = 6.3 to 9.7 to 6.5 dBi and SWR (300-ohms) under 2.3 [Excellent]. Hi-VHF Raw Gain = 4.7 to 5.0 dBi and SWR (300-ohms) under 2.3 [Excellent]. Based on 4nec2 file posted by MagiMaster on 8Nov2013, plus my mods to add FR+RP Plotting Statements and add Rsrc to Tweak AGT (was off by only 0.1 dB): http://www.digitalhome.ca/forum/showthread.php?p=1881665 Plus Horizontal Elements connected to SOURCE Wire that turn it into Bokabob's Centipede-1: http://www.digitalhome.ca/forum/showthread.php?p=1053924 In a similar fashion to the Bowtie-In-Rect-Loop and 2-Bay-In-Rect-Loop models, in addition to the SYmbol Variables for the Inner Antenna, I also allowed the Inner Antenna to slide up and down within the Outer Rectangle when running nikiml's Python Optimization scripts. When the Inner Antenna was centered nearly an inch higher than the centerline, the Beam was directed slightly Upwards, but only on 506 +/- 12 MHz, otherwise it was directed towards the Horizon. Date(s): 11 Nov 2013. Album by holl_ands. 1 - 23 of 23 Total. 1344 Visits.
enlarge 73KB, 616x1024 1 2Square-Centipede-In-Rect-Loop 3D View enlarge 241KB, 688x1024 2 2Square-Centipede-In-Rect-Loop Front View [1 large square = 2.5 inches] enlarge 30KB, 791x1024 3 2Square-Centipede-In-Rect-Loop 4nec2 File enlarge 181KB, 1152x691 4 2Square-Centipede-In-Rect-Loop UHF Raw Gain = 6.3 to 9.7 to 6.5 dBi enlarge 219KB, 1152x691 5 2Square-Centipede-In-Rect-Loop UHF SWR (300-ohms) Under 2.3 enlarge 251KB, 1152x691 6 2Square-Centipede-In-Rect-Loop UHF Impedance enlarge 309KB, 1024x1024 7 2Square-Centipede-In-Rect-Loop Elevation Pattern at 470 MHz Beam Directed to Horizon enlarge 310KB, 1024x1024 8 2Square-Centipede-In-Rect-Loop Elevation Pattern at 506 MHz Beam Directed slightly UPWARDS enlarge 306KB, 1024x1024 9 2Square-Centipede-In-Rect-Loop Elevation Pattern at 698 MHz Beam Directed to Horizon enlarge 318KB, 1024x1024 10 2Square-Centipede-In-Rect-Loop Azimuthal Pattern at 470 MHz enlarge 317KB, 1024x1024 11 2Square-Centipede-In-Rect-Loop Azimuthal Pattern at 530 MHz enlarge 315KB, 1024x1024 12 2Square-Centipede-In-Rect-Loop Azimuthal Pattern at 590 MHz enlarge 313KB, 1024x1024 13 2Square-Centipede-In-Rect-Loop Azimuthal Pattern at 650 MHz enlarge 312KB, 1024x1024 14 2Square-Centipede-In-Rect-Loop Azimuthal Pattern at 698 MHz enlarge 312KB, 1024x1024 15 2Square-Centipede-In-Rect-Loop Azimuthal Pattern at 806 MHz enlarge 175KB, 1152x691 16 2Square-Centipede-In-Rect-Loop Hi-VHF Raw Gain = 4.7 to 5.0 dBi enlarge 202KB, 1152x691 17 2Square-Centipede-In-Rect-Loop Hi-VHF SWR (300-ohms) Under 2.3 enlarge 240KB, 1152x691 18 2Square-Centipede-In-Rect-Loop Hi-VHF Impedance enlarge 315KB, 1024x1024 19 2Square-Centipede-In-Rect-Loop Azimuthal Pattern at 174 MHz enlarge 315KB, 1024x1024 20 2Square-Centipede-In-Rect-Loop Azimuthal Pattern at 198 MHz enlarge 319KB, 1024x1024 21 2Square-Centipede-In-Rect-Loop Azimuthal Pattern at 216 MHz enlarge 22KB, 791x1024 22 2Square-Centipede-In-Rect-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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