• Public Gallery  • Help
		• Join Now!  • Log In  • Feature Tour

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/
H+U 2-Bay+Loop RLH2 (12x10) - NO Refl Hi-VHF+UHF 2-Bay + Rectangular Loop, RLH2 (12x10) with NO Reflector analyzed using 4nec2 after determining Dimensions using nikiml's Python Optimization Scripts.  Rectangular Loop Resonator improves Hi-VHF Gain and SWR. Loop Diameter of 3/4-in was assumed for this initial Optimization, but is NOT critical. SWR in Hi-VHF Band remains under 2.7 for 1/4-in O.D. (or larger) and climbs to only 2.9 with AWG10. And at 698 MHz, SWR climbs from 2.7 to 2.8 if only 1/4-in O.D. and 2.9 if use as small as AWG10. RLH2 (12.0x10.0): Re-Optimized 2-Bay plus Rectangular Loop, with 0.5-in Offset (Forward) to avoid wire collisions. Nikiml's Python Optimization Scripts determined that a 2-Bay (12.0x10.0) provides the BEST overall performance with significantly higher UHF Raw Gain than the two alternates above and lowest SWR in both UHF and Hi-VHF Bands. UHF Raw Gain = 8.0-8.9-7.8-8.5-8.0 dBi or 8.3 dBi +/- 0.5 dB [INCREASE of 2.3 dB on low freqs & DECREASE of 1.2 dB on high freqs, providing a MUCH Flatter Frequency Response] and SWR (300-ohms) under 3.1 (FAIR). Hi-VHF Raw Gain = 3.9 to 4.3 dBi [INCREASE of 1.9 to 1.8 dB] and SWR (300-ohms) under 2.3 [EXCELLENT]. OPTIMIZED DIMENSIONS (ALL AWG10 Elements, except 3/4-in O.D. Loop): BowLength = 12.0-in = Whisker Length BowSpacing = 10.0-in = Bowtie-to-Bowtie Separation TineSep = 6.25-in = Tip-to-Tip Tine Separation FeedSep = 4.5-in = Feedline Separation Rectangular Loop = 26.75-in H x 21.0-in W Offset = 0.5-in = Offset Separation between Bowties & Loop Date(s): 12 Feb 2015. Album by holl_ands. 1 - 19 of 19 Total. 7384 Visits.
enlarge 61KB, 598x1024 1 RLH2-Bay (12.0x10.0) + Rectangular Loop Front View 3D View enlarge 307KB, 993x1024 2 RLH2-Bay (12.0x10.0) + Rectangular Loop Front View - 0.5-in Between 2-Bay & Loop Loop is about 26.75-in H x 21.0-in W Feedline Separation is about 4.5-in Tine Separation is about 6.25-in [1 large square = 2.5 inches] enlarge 85KB, 289x1024 3 RLH2-Bay (12.0x10.0) + Rectangular Loop Top View - 0.5-in Between 2-Bay & Loop [1 large square = 2.5 inches] enlarge 169KB, 1024x677 4 RLH2-Bay (12.0x10.0) + Rectangular Loop UHF Raw Gain = 8.0-8.8-7.8-8.4-7.9 dBi or 8.3 dBi +/- 0.5 dB enlarge 168KB, 1024x677 5 RLH2-Bay (12.0x10.0) + Rectangular Loop UHF SWR (300-ohms) Under 3.1 enlarge 221KB, 1024x677 6 RLH2-Bay (12.0x10.0) + Rectangular Loop UHF Impedance enlarge 306KB, 1024x1024 7 RLH2-Bay (12.0x10.0) + Rectangular Loop Azimuthal Pattern at 470 MHz enlarge 311KB, 1024x1024 8 RLH2-Bay (12.0x10.0) + Rectangular Loop Azimuthal Pattern at 530 MHz enlarge 310KB, 1024x1024 9 RLH2-Bay (12.0x10.0) + Rectangular Loop Azimuthal Pattern at 590 MHz enlarge 316KB, 1024x1024 10 RLH2-Bay (12.0x10.0) + Rectangular Loop Azimuthal Pattern at 650 MHz enlarge 315KB, 1024x1024 11 RLH2-Bay (12.0x10.0) + Rectangular Loop Azimuthal Pattern at 698 MHz enlarge 32KB, 791x1024 12 RLH2-Bay (12.0x10.0) + Rectangular Loop 4nec2 File Includes Dimensions enlarge 155KB, 1024x677 13 RLH2-Bay (12.0x10.0) + Rectangular Loop Hi-VHF Raw Gain = 3.9 to 4.3 dBi enlarge 178KB, 1024x677 14 RLH2-Bay (12.0x10.0) + Rectangular Loop Hi-VHF SWR (300-ohms) Under 2.3 is MOST EXCELLENT Improvement enlarge 207KB, 1024x677 15 RLH2-Bay (12.0x10.0) + Rectangular Loop Hi-VHF Impedance enlarge 314KB, 1024x1024 16 RLH2-Bay (12.0x10.0) + Rectangular Loop Azimuthal Pattern at 174 MHz enlarge 314KB, 1024x1024 17 RLH2-Bay (12.0x10.0) + Rectangular Loop Azimuthal Pattern at 198 MHz enlarge 318KB, 1024x1024 18 RLH2-Bay (12.0x10.0) + Rectangular Loop Azimuthal Pattern at 216 MHz enlarge 236KB, 1024x696 19 M2 vs H2 vs RLH2 Comparison - No Refl Raw Gain H2 is Significant Improvement vs mclapp M2 RLH2's Hi-VHF Resonator Loop provides acceptable Hi-VHF SWR at expense of lower Gain on Upper Channels
Select All.
Sign the Guestbook. There are no entries.