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holl_ands | Home > Bowties, Dipoles, Batwings & Rhombics > Browse:UHF Stick Dipole - No ReflectorUHF Bowties - NO ReflectorUHF Fractal Bowtie - No ReflectorUHF CM4248 Folded Dipole Bowtie (ONLY)91XG Dipole ONLY & Dipole+First DirectorUHF Batwing - No Refl & Screen Grid ReflUHF Small Rhombic StackUHF Double RhomboidVHF Stick Dipoles incl Horiz.Rabbit-EarsHi-VHF+UHF Stick Dipole - No ReflectorHi-VHF+UHF "VEE" Stick DipoleHi-VHF Bowties - No ReflectorLo+Hi-VHF 1-Bay Bowtie - No Reflector
Hi-VHF+UHF Stick Dipole - No Reflector Hi-VHF+UHF Stick Dipole (NO Reflector) analyzed using 4nec2. Two versions were analyzed: a) Optimized for Hi-VHF Band, b) Jointly Optimized for Hi-VHF & UHF Bands, using nikiml's Optimization Python Scripts. ############################################### a) Optimized for Hi-VHF Band: Overall Length = 28.2-inches, 1/2-in Copper Tubing. VERY POOR for UHF Band: Hi-VHF Raw Gain = 1.8 to 2.0 dBi and SWR (75-ohms) Under 2.8.  SWR (300-ohms) = 5.3 to 2.5. UHF Raw Gain = 4.5 dB at 470 MHz, rolling off to below 0 dBi higher than 570 MHz and SWR (75-ohms) Excessive except Under 2.7 for 555 to 625 MHz. UHF SWR (300-ohms) about 6 at 470 MHz, decreasing to below 2.7 at 590 MHz and above, where there is only negative Raw Gain. ############################################### b) Jointly Optimized for Hi-VHF and UHF Bands: Length = 25.6-inches, 1/2-in Copper Tubing. VERY POOR for UHF Band. Hi-VHF Raw Gain = 2.0 to 2.2 dBi and SWR (75-ohms) = 4.9 to 1.4, excessive on lower channels, while SWR (300-ohms) = 8.0 to 3.5 is even worse. UHF Raw Gain = 4-5 dBi in lower UHF Band and then rolls off above about 580 MHz, SWR (75-ohms) Excessive, except under 2.7 from 605 to 698 MHz, where there is only negative Raw Gain. SWR (300-ohms) Excessive, except under 2.7 from 655 to 698 MHz, where there is only negative Raw Gain. Date(s): 24 Jul 2014. Album by holl_ands. 1 - 36 of 36 Total. 7119 Visits.
enlarge 36KB, 1024x815 1 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band 3D View enlarge 94KB, 1152x319 2 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Front View [1 large square = 5 inches] enlarge 27KB, 791x1024 3 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band 4nec2 File enlarge 159KB, 1024x690 4 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Hi-VHF Raw Gain = 1.8 to 2.0 dBi enlarge 193KB, 1024x690 5 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Hi-VHF SWR (75-ohms) Under 2.8 enlarge 238KB, 1024x690 6 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Ch13-69 Impedance enlarge 171KB, 1024x690 7 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Ch13-69 Raw Gain Increases into lower UHF Band and Rolls Off beyond about 550 MHz enlarge 204KB, 1024x690 8 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Ch13-69 SWR (75-ohms) is only acceptable in Hi-VHF Band and about 550-630 MHz enlarge 201KB, 1024x690 9 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Ch13-69 SWR (300-ohms) is NOT acceptable in Hi-VHF Band, but is for 570-698 MHz enlarge 317KB, 1024x1024 10 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Azimuthal Pattern at 174 MHz enlarge 317KB, 1024x1024 11 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Azimuthal Pattern at 198 MHz enlarge 317KB, 1024x1024 12 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Azimuthal Pattern at 216 MHz enlarge 313KB, 1024x1024 13 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Azimuthal Pattern at 474 MHz enlarge 316KB, 1024x1024 14 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Azimuthal Pattern at 528 MHz enlarge 337KB, 1024x1024 15 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Azimuthal Pattern at 582 MHz enlarge 338KB, 1024x1024 16 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Azimuthal Pattern at 612 MHz enlarge 344KB, 1024x1024 17 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Azimuthal Pattern at 696 MHz enlarge 331KB, 1024x1024 18 Hi-VHF+UHF Stick Dipole Optimized for Hi-VHF Band Azimuthal Pattern at 804 MHz enlarge 32KB, 1024x767 19 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF 3D View enlarge 103KB, 1152x339 20 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Front View [1 large square = 5 inches] enlarge 27KB, 791x1024 21 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF 4nec2 File enlarge 159KB, 1024x690 22 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Hi-VHF Raw Gain = 2.0 to 2.2 dBi enlarge 198KB, 1024x690 23 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Hi-VHF SWR (75-ohms) unacceptable on lower freqs enlarge 238KB, 1024x690 24 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Ch13-69 Impedance enlarge 112KB, 1152x453 25 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Ch13-69 Raw Gain enlarge 204KB, 1024x690 26 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Ch13-69 SWR (75-ohms) increases unacceptably in Hi-VHF Band, UHF Band Shifts up enlarge 207KB, 1024x690 27 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Ch13-69 SWR (300-ohms) unacceptable in Both Hi-VHF & UHF Bands enlarge 317KB, 1024x1024 28 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Azimuthal Pattern at 174 MHz enlarge 316KB, 1024x1024 29 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Azimuthal Pattern at 198 MHz enlarge 316KB, 1024x1024 30 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Azimuthal Pattern at 216 MHz enlarge 314KB, 1024x1024 31 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Azimuthal Pattern at 474 MHz enlarge 310KB, 1024x1024 32 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Azimuthal Pattern at 528 MHz enlarge 316KB, 1024x1024 33 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Azimuthal Pattern at 582 MHz enlarge 344KB, 1024x1024 34 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Azimuthal Pattern at 612 MHz enlarge 342KB, 1024x1024 35 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Azimuthal Pattern at 696 MHz enlarge 345KB, 1024x1024 36 Hi-VHF+UHF Stick Dipole Joint Optimization Hi-VHF & UHF Azimuthal Pattern at 804 MHz
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