UHF 7-Element-Pair Flat LPDA (Log Periodic Dipole Array) with Swept Forward Elements, aka Terk HDTVi and HDTVa, analyzed using 4nec2. Note that Characteristic Impedance is 75-ohms and it is POSSIBLE that Amplified model has an Impedance Matching Network for improved SWR. BOOM LENGTH =13.5-in.
UHF Raw Gain = 6.0 to 6.9 dBi, F/B & F/R Ratios = 8.4 to 17.0 dB and SWR (300-ohms) Under 3.9 is Higher than Desired.
Hi-VHF Raw Gain = 3.0 to 2.7 dBi, F/B & F/R Ratios = 0.3 to 0.6 dB and SWR (300-ohms) Under 110 is Excessive.
EDIT (3Apr2017): Added Elevation Pattern Charts.
Date(s): 11 Aug 2015. Album by holl_ands. 1 - 26 of 26 Total. 2249 Visits.
enlarge 142KB, 1024x675 1 UHF 7-El-Pair LPDA - Terk HDTVi 3D View
enlarge 107KB, 1152x312 2 UHF 7-El-Pair LPDA - Terk HDTVi Front View [1 large square = 1.25 inches]
enlarge 346KB, 1024x948 3 UHF 7-El-Pair LPDA - Terk HDTVi Top View [1 large square = 1.25 inches]
enlarge 189KB, 1024x741 4 UHF 7-El-Pair LPDA - Terk HDTVi UHF Raw Gain = 6.0 to 6.9 dBi UHF F/B & F/R Ratios = 8.4 to 17.0 dB
enlarge 196KB, 1024x741 5 UHF 7-El-Pair LPDA - Terk HDTVi UHF SWR (75-ohms) Under 3.9 is Higher than Desired
enlarge 187KB, 1024x741 6 UHF 7-El-Pair LPDA - Terk HDTVi UHF SWR (75-ohms) Under 3.3 is Only Slightly Better
enlarge 302KB, 1024x1024 7 UHF 7-El-Pair LPDA - Terk HDTVi Azimuthal Pattern at 470 MHz
enlarge 302KB, 1024x1024 8 UHF 7-El-Pair LPDA - Terk HDTVi Azimuthal Pattern at 530 MHz
enlarge 306KB, 1024x1024 9 UHF 7-El-Pair LPDA - Terk HDTVi Azimuthal Pattern at 590 MHz
enlarge 302KB, 1024x1024 10 UHF 7-El-Pair LPDA - Terk HDTVi Azimuthal Pattern at 650 MHz
enlarge 301KB, 1024x1024 11 UHF 7-El-Pair LPDA - Terk HDTVi Azimuthal Pattern at 698 MHz
enlarge 301KB, 1024x1024 12 UHF 7-El-Pair LPDA - Terk HDTVi Azimuthal Pattern at 806 MHz
enlarge 323KB, 1024x1024 13 UHF 7-El-Pair LPDA - Terk HDTVi Elevation Pattern at 470 MHz
enlarge 320KB, 1024x1024 14 UHF 7-El-Pair LPDA - Terk HDTVi Elevation Pattern at 530 MHz
enlarge 320KB, 1024x1024 15 UHF 7-El-Pair LPDA - Terk HDTVi Elevation Pattern at 590 MHz
enlarge 334KB, 1024x1024 16 UHF 7-El-Pair LPDA - Terk HDTVi Elevation Pattern at 650 MHz
enlarge 339KB, 1024x1024 17 UHF 7-El-Pair LPDA - Terk HDTVi Elevation Pattern at 698 MHz
enlarge 350KB, 1024x1024 18 UHF 7-El-Pair LPDA - Terk HDTVi Elevation Pattern at 806 MHz
enlarge 168KB, 1024x741 19 UHF 7-El-Pair LPDA - Terk HDTVi Hi-VHF Raw Gain = 3.0 to 2.7 dBi Hi-VHF F/B & F/R Ratios = 0.3 to 0.6 dB
enlarge 189KB, 1024x741 20 UHF 7-El-Pair LPDA - Terk HDTVi Hi-VHF SWR (75-ohms) Under 110 is Excessive
enlarge 189KB, 1024x741 21 UHF 7-El-Pair LPDA - Terk HDTVi Hi-VHF SWR (300-ohms) Under 212 is Excessive
enlarge 308KB, 1024x1024 22 UHF 7-El-Pair LPDA - Terk HDTVi Azimuthal Pattern at 174 MHz
enlarge 303KB, 1024x1024 23 UHF 7-El-Pair LPDA - Terk HDTVi Azimuthal Pattern at 198 MHz
enlarge 302KB, 1024x1024 24 UHF 7-El-Pair LPDA - Terk HDTVi Azimuthal Pattern at 216 MHz
enlarge 40KB, 791x1024 25 UHF 7-El-Pair LPDA - Terk HDTVi 4nec2 File Includes Summary of Dimensions
enlarge 26KB, 791x1024 26 UHF 7-El-Pair LPDA - Terk HDTVi EVAL Summary of Performance
