Antennas Direct 91XG (aka XG91) Dipole (ONLY) analyzed using 4nec2. XG91a.nec model originally from Ken Nist on hdtvprimer.com. Determined Characteristic Impedance was 350-ohms (300-ohm load had nearly the SAME performance).
Dipole plus the closely coupled First Director also analyzed to show effect on Gain, SWR and Characteristic Impedance, which was improved to 280-ohms (300-ohm load had nearly the SAME performance).
NOTE: There are several variations of the XG91/91XG from different manufacturers. Carefully check your dimensions against Ken Nist's model...esp. if you think you have a 75-ohm balun.
Date(s): 20 Aug 2011. Album by holl_ands. 1 - 30 of 30 Total. 6500 Visits.
enlarge 91KB, 1024x813 1 XG91 Dipole ONLY - 3D View Showing Colorized Segmentation.
enlarge 78KB, 1152x213 2 XG91 Dipole ONLY - Front View [1 small box = 0.25-inch] [1 big box = 1.25-inch]
enlarge 48KB, 144x1024 3 XG91 Dipole ONLY - Top View [1 small box = 0.25-inch] [1 big box = 1.25-inch]
enlarge 148KB, 1152x611 4 XG91 Dipole ONLY UHF Raw Gain