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holl_ands | Home > Amateur Radio Antennas > Browse:70cm+FRS+GMRS 20-El FD-Yagi2m Stick Vertical Dipole2m Lindenblad Omni Array2m Lindenblad Parasitic + Vert. Dipole
2m Lindenblad Parasitic + Vert. Dipole 2-meter (145 MHz) Lindenblad Parasitic Array with Vertical Dipole Active Element analyzed using 4nec2. More info found here: http://ww2.amsat.org/wordpress/wp-content/uploads/2014/01/70ParaLindy.pdf Based on lindnbld.ez (EZNEC) File downloaded from http://nec-archives.pa3kj.com/EZNEC_FILES, which was Imported into 4nec2 and then converted into a Variable SYmbol driven File to facilitate further analysis, as found below in the 4nec2 File with Vertical Dipole added. The Lindenblad PARASITIC Array (with Active Vertical Dipole added in the Center) is SIMILAR to the Lindenblad Active Array (see analysis in next post). HOWEVER, note that the POSITIVE Angle of Diagonals in the Lindenblad Active Array must be changed to NEGATIVE Angles in the Parasitic Array to ensure that it primarily responds to RHCP signals. Vertical Dipole and Parasitic Diagonal Element Lengths were adjusted for minimum SWR (50-ohms) and minimum LHCP on 145 MHz, assuming Diagonals at 45-deg Angles and separated 1/4-wavelength away from the Center of the Antenna (did NOT try to Optimize).  All Elements are AWG12 Copper Wire. For signals with RHCP (Right Hand Circular Polarization), the Azimuthal Patter is TRUE OMNI. However, for signals with mostly Horizontal Polarization, there is significantly lower Gain. When signals are reflected, they usually undergo a change from RHCP to LHCP.  This version of the Lindenblad Omni Array provides a moderate amount of suppression of these Multipath Reflections. Parasitic Elements improve Vertical Dipole's Raw Gain by 0.75 dB to Max = 2.9 dBi at 145 MHz where Length of Vertical Dipole is adjusted for SWR Min at 145 MHz, while also adjusting Lengths of Diagonal Parasitic Elements for LHCP Min at 145 MHz. Response to Horizontally Polarized signals is low but significantly more than Vertical Dipole alone. Date(s): 7 Oct 2015. Album by holl_ands. 1 - 33 of 33 Total. 4093 Visits.
enlarge 50KB, 1024x916 1 2m Lindenblad Parasitic + Vert. Dipole 3D View enlarge 217KB, 1024x748 2 2m Lindenblad Parasitic + Vert. Dipole Front View [1 large square = 5 inches] enlarge 241KB, 1024x886 3 2m Lindenblad Parasitic + Vert. Dipole Top View [1 large square = 5 inches] enlarge 188KB, 1024x722 4 2m Lindenblad Parasitic + Vert. Dipole Raw Gain Max = 2.9 dBi at 145 MHz enlarge 205KB, 1024x722 5 2m Lindenblad Parasitic + Vert. Dipole SWR (50-ohms) Under 1.3 at 145 MHz enlarge 244KB, 1024x722 6 2m Lindenblad Parasitic + Vert. Dipole Impedance vs Frequency enlarge 337KB, 1024x1024 7 2m Lindenblad Parasitic + Vert. Dipole RHCP Azimuthal Pattern at 130 MHz enlarge 331KB, 1024x1024 8 2m Lindenblad Parasitic + Vert. Dipole RHCP Azimuthal Pattern at 135 MHz enlarge 322KB, 1024x1024 9 2m Lindenblad Parasitic + Vert. Dipole RHCP Azimuthal Pattern at 140 MHz enlarge 317KB, 1024x1024 10 2m Lindenblad Parasitic + Vert. Dipole RHCP Azimuthal Pattern at 145 MHz enlarge 322KB, 1024x1024 11 2m Lindenblad Parasitic + Vert. Dipole RHCP Azimuthal Pattern at 150 MHz enlarge 323KB, 1024x1024 12 2m Lindenblad Parasitic + Vert. Dipole RHCP Azimuthal Pattern at 160 MHz enlarge 323KB, 1024x1024 13 2m Lindenblad Parasitic + Vert. Dipole RHCP Elevation Pattern at 130 MHz enlarge 320KB, 1024x1024 14 2m Lindenblad Parasitic + Vert. Dipole RHCP Elevation Pattern at 135 MHz enlarge 314KB, 1024x1024 15 2m Lindenblad Parasitic + Vert. Dipole RHCP Elevation Pattern at 140 MHz enlarge 313KB, 1024x1024 16 2m Lindenblad Parasitic + Vert. Dipole RHCP Elevation Pattern at 145 MHz enlarge 322KB, 1024x1024 17 2m Lindenblad Parasitic + Vert. Dipole RHCP Elevation Pattern at 150 MHz enlarge 321KB, 1024x1024 18 2m Lindenblad Parasitic + Vert. Dipole RHCP Elevation Pattern at 160 MHz enlarge 315KB, 1024x1024 19 2m Lindenblad Parasitic + Vert. Dipole Azimuthal Pattern at 130 MHz enlarge 321KB, 1024x1024 20 2m Lindenblad Parasitic + Vert. Dipole Azimuthal Pattern at 135 MHz enlarge 332KB, 1024x1024 21 2m Lindenblad Parasitic + Vert. Dipole Azimuthal Pattern at 140 MHz enlarge 338KB, 1024x1024 22 2m Lindenblad Parasitic + Vert. Dipole Azimuthal Pattern at 145 MHz enlarge 329KB, 1024x1024 23 2m Lindenblad Parasitic + Vert. Dipole Azimuthal Pattern at 150 MHz enlarge 324KB, 1024x1024 24 2m Lindenblad Parasitic + Vert. Dipole Azimuthal Pattern at 160 MHz enlarge 312KB, 1024x1024 25 2m Lindenblad Parasitic + Vert. Dipole Elevation Pattern at 130 MHz enlarge 318KB, 1024x1024 26 2m Lindenblad Parasitic + Vert. Dipole Elevation Pattern at 135 MHz enlarge 319KB, 1024x1024 27 2m Lindenblad Parasitic + Vert. Dipole Elevation Pattern at 140 MHz enlarge 320KB, 1024x1024 28 2m Lindenblad Parasitic + Vert. Dipole Elevation Pattern at 145 MHz enlarge 320KB, 1024x1024 29 2m Lindenblad Parasitic + Vert. Dipole Elevation Pattern at 150 MHz enlarge 322KB, 1024x1024 30 2m Lindenblad Parasitic + Vert. Dipole Elevation Pattern at 160 MHz enlarge 27KB, 791x1024 31 2m Lindenblad Parasitic + Vert. Dipole 4nec2 File Includes Summary of Dimensions enlarge 22KB, 791x1024 32 2m Lindenblad Parasitic + Vert. Dipole EVAL Performance Summary enlarge 21KB, 791x1024 33 2m Lindenblad Parasitic + Vert. Dipole EVAL *.html Performance Summary
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