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holl_ands | Home > Loop Antennas incl Folded Dipole > Browse:Compare LoopsWi-Fi Folded Dipole - 2400-2500 MHzUHF Folded & Tri-Folded DipolesHi-VHF+UHF "VEE" Folded DipoleUHF Circular & Square Loops NO ReflectorUHF "Figure-8" Twin Loops - NO ReflUHF "Figure-8" Twin-Loops + xxRR - OPTHi-VHF Figure-8 Twin Loops - NO ReflUHF Twin-Hoop Chireix - NO or 26ReflRodsHi-VHF+UHF Tapered Loop - A-D C2 & C2-VHi-VHF+UHF Tapered DoubleLoop - d510d180UHF Shorted Bowtie Loop (SBL)Hi-VHF+UHF Bowtie-In-Loop - NO ReflectorHi-VHF+UHF Bowtie-In-Loop + 11RR - OPTHi-VHF+UHF Bowtie-In-Loop (DblAngRefl)HiVHF+UHF DreamcatcherU+H 2-Bay Hentenna NO+11ReflRodsUHF Hourglass LoopUHF Quad-Trapezoid-LoopUHF Quad-Trapezoid-Loop+2xBarsUHF Quadazoid Loop - No ReflUHF Quadazoid Loop + ReflectorHi-VHF Folded DipolesHi-VHF Circular Loop + ReflectorHi-VHF Square Loop + ReflectorHiVHF Shorted Bowtie Loop (NO Reflector)Hi-VHF Shorted Bowtie Loop (w Reflector)Hi-VHF Hourglass LoopHi-VHF Quad-Trapezoid-LoopHi-VHF Quad-Trapezoid-Loop+2Bars - OPTLo-VHF Tri-Folded Dipoles - OPTLo-VHF 2-Bay Folded Dipole - OPTVHF Square & Circular LoopsLo-VHF Folded DipolesLoVHF Hourglass-Loop - No ReflectorLoVHF+FM Hourglass LoopLoVHF Hourglass-Loop + 3 ReflRodsLoVHF Hourglass-Loop + 5 ReflRodsHi-VHF (+UHF) Twin Rectangular LoopsHiVHF+UHF RL-M2 2-Bay+Loop - NO Refl.H+U 2-Bay+Loop RLH2 (12x10) - NO ReflH+U 2-Bay+Loop RLH2 (10.5x8.7) - NO ReflH+U 4-Bay Loop RLH4 - No ReflHiVHF+UHF 2Square-Chireix-In-Rect. LoopHi-VHF+UHF In 3-ftx2-ft Picture Frame/
LoVHF+FM Hourglass Loop Ch2-6 + FM Hourglass Loop analyzed using 4nec2 after finding "best" dimensions using nikiml's Optimization Scripts. Based on UHF Hourglass Loop posted by oneolddude in www.digitalhome.ca forum. Cut a 1-in wide hole in the middle of the 15-in long "Feedpoint Gap" to attach 300:75-ohm Balun Transformer. Although the below results presumed 0.569-in O.D. Copper Tubing/Pipe, the design is not that sensitive to wire size.  AWG10 (House Wire) loses 1 dB Raw Gain, with SWR under 2.2. NO Reflector Rods (Overall 67.5-in H x 87.25-in W, using Half-inch Copper Tubing): Raw Gain = 3.3-4.5 dBi on Ch2-6, rising to 5.5 dBi across FM Band. Gain Loss across Ch8-13 is due to Azimuth moving to diagonals. Excellent SWR on all channels. CONSTRUCTION HINT: I would use 3/4-in PVC tubes (white sprinkler or grey PVC electrical conduit if Outdoors) in a Rectangle a bit bigger than Antenna, held together with 90-deg Elbows PLUS 4 Tie Wraps through holes. For rigidity, I would add TWO more horizontal cross pieces at about 1/3 and 2/3 height levels. PVC Glue should be used ONLY on the Elbows and TEE's where they connect to the HORIZONTAL pieces, with NO GLUE on the Vertical pieces to facilitate assembly on the Ground and partial disassembly into a tight bundle that can be feed up through an Attic Entry Hole.  Glue MAY NOT be needed once re-assembled in the Attic....or perhaps use small globs of RTV that can be cut if need be. Date(s): 29 Nov 2012. Album by holl_ands. 1 - 18 of 18 Total. 9668 Visits.
enlarge 87KB, 991x1024 1 Lo-VHF+FM Hourglass Loop 3D View Half-inch Copper Tubing, smaller reduces performance enlarge 212KB, 1024x939 2 Lo-VHF+FM Hourglass Loop Front View Overall: 67.5-in H x 87.25-in W Diagonals = 49.44-in [49.5 is OK] Feedpoint Gap = 15.0-in [1 large box = 12.5 inches] enlarge 28KB, 791x1024 3 Lo-VHF+FM Hourglass Loop 4nec2 File enlarge 199KB, 1152x692 4 Lo-VHF+FM Hourglass Loop Ch2-13 Raw Gain Hi-VHF Gain moves to the DIAGONALS, see Patterns below enlarge 203KB, 1152x692 5 Lo-VHF+FM Hourglass Loop Ch2-13 SWR (300-ohm) is Excellent on ALL channels enlarge 278KB, 1152x692 6 Lo-VHF+FM Hourglass Loop Ch2-13 Impedance enlarge 315KB, 1024x1024 7 Lo-VHF+FM Hourglass Loop Azimuthal Pattern on 54 MHz (Ch2) enlarge 314KB, 1024x1024 8 Lo-VHF+FM Hourglass Loop Azimuthal Pattern on 72 MHz (Ch4) enlarge 314KB, 1024x1024 9 Lo-VHF+FM Hourglass Loop Azimuthal Pattern on 84 MHz (Ch6) enlarge 314KB, 1024x1024 10 Lo-VHF+FM Hourglass Loop Azimuthal Pattern on 90 MHz (Low FM) enlarge 311KB, 1024x1024 11 Lo-VHF+FM Hourglass Loop Azimuthal Pattern on 99 MHz (Mid FM) enlarge 312KB, 1024x1024 12 Lo-VHF+FM Hourglass Loop Azimuthal Pattern on 108 MHz (High FM) enlarge 319KB, 1024x1024 13 Lo-VHF+FM Hourglass Loop Azimuthal Pattern on 174 MHz enlarge 336KB, 1024x1024 14 Lo-VHF+FM Hourglass Loop Azimuthal Pattern on 186 MHz enlarge 339KB, 1024x1024 15 Lo-VHF+FM Hourglass Loop Azimuthal Pattern on 198 MHz enlarge 337KB, 1024x1024 16 Lo-VHF+FM Hourglass Loop Azimuthal Pattern on 210 MHz enlarge 337KB, 1024x1024 17 Lo-VHF+FM Hourglass Loop Azimuthal Pattern on 216 MHz enlarge 22KB, 791x1024 18 Lo-VHF+FM Hourglass Loop Python Optimization Control *.bat File
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