Antennas Direct (OLD) DB-2 with Reflector analyzed using EZNEC file posted by Ken Nist, as modified to run with 4nec2. Eagle-Aspen 2-Bay appears to have same/similar Dimensions: http://www.hdtvprimer.com/SIMS/ [Note: Nist's long Twinlead was deleted.]
AWG6 BowLength = 6.3-in, Bowtie Spacing = 7.8-in, Tine Separation = 4.0-in. AWG12 Feedline Separation = 1.7-in. Angled Screen Reflector 12.8"H x 19.1"W, with outer 1-in bent forward and is 4.0-in from center of Bowties (Grid = 1"H x 2.55"W).
UHF Raw Gain = 2.8 dBi on Ch14, 8-11.5 dBi on higher channels. UHF SWR is under 2.5 Whiskers (Length=6.25-in) are TOO SHORT, resulting in a sharp Raw Gain drop off on Ch14.
Hi-VHF Raw Gain is higher towards the REVERSE (4-6.8 dBi) and up to -4 dBi (Negative Gain) FORWARD. Hi-VHF SWR is EXCESSIVE.
Date(s): 30 Jan 2012. Album by holl_ands. 1 - 19 of 19 Total. 3652 Visits.
enlarge 215KB, 1024x1006 1 A-D DB-2 with Reflector 3D View
enlarge 251KB, 1024x730 2 A-D DB-2 with Reflector Front View [1 big box = 2.5-inches]
enlarge 97KB, 390x1024 3 A-D DB-2 with Reflector Top View [1 big box = 1.25-inches]
enlarge 160KB, 1024x686 4 A-D DB-2 with Reflector UHF Raw Gain has sharp drop-off on Ch14
enlarge 170KB, 1024x686 5 A-D DB-2 with Reflector UHF SWR (300-ohms) under 2.5
enlarge 147KB, 1024x686 6 A-D DB-2 with Reflector UHF Impedance
enlarge 293KB, 1024x1024 7 A-D DB-2 with Reflector Azimuthal Pattern at 470 MHz
enlarge 295KB, 1024x1024 8 A-D DB-2 with Reflector Azimuthal Pattern at 590 MHz
enlarge 297KB, 1024x1024 9 A-D DB-2 with Reflector Azimuthal Pattern at 698 MHz
enlarge 298KB, 1024x1024 10 A-D DB-2 with Reflector Azimuthal Pattern at 758 MHz
enlarge 303KB, 1024x1024 11 A-D DB-2 with Reflector Azimuthal Pattern at 806 MHz
enlarge 144KB, 492x1024 12 A-D DB-2 with Reflector Side View [1 big box = 2.5-inches]
enlarge 141KB, 1024x686 13 A-D DB-2 with Reflector Hi-VHF Raw Gain to REVERSE
enlarge 123KB, 1024x686 14 A-D DB-2 with Reflector Hi-VHF Raw Gain FORWARD is NEGATIVE
enlarge 156KB, 1024x686 15 A-D DB-2 with Reflector Hi-VHF SWR (300-ohms) is EXCESSIVE
enlarge 301KB, 1024x1024 16 A-D DB-2 with Reflector Azimuthal Pattern at 174 MHz
MORE GAIN TO THE REAR
enlarge 302KB, 1024x1024 17 A-D DB-2 with Reflector Azimuthal Pattern at 198 MHz
MORE GAIN TO THE REAR
enlarge 303KB, 1024x1024 18 A-D DB-2 with Reflector Azimuthal Pattern at 216 MHz
MORE GAIN TO THE REAR
enlarge 43KB, 791x1024 19 A-D DB-2 with Reflector 4nec2 File
