UHF Four-Unequal-Diamonds


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UHF Four-Unequal-Diamonds - 11 Refl Rods

UHF Four-Unequal-Diamonds (aka Double Bi-Quad) with 11 Reflector Rods analyzed using 4nec2.
Dimensions per 4nec2 file prepared by Walter Dnes for Model X-150:
http://www.digitalhome.ca/forum/showthread.php?p=947711#post947711

Note that this is based on the old Italian Fracarro PU-4 Panel Antenna, which had a Reflector Grid instead.

Provides very flat Gain across all of New UHF Band with Max = 11.4 dBi & Min = 10.9 with SWR Under 1.5.
F/B and F/R Ratios are Excellent, except for lowest frequencies.

Hi-VHF Gain is a bit less than Rabbit Ears (even less in the Forward direction) with Excessive SWR.

Date(s): 30 Apr 2013. Album by holl_ands. 1 - 21 of 21 Total. 5936 Visits.

enlarge 93KB, 581x1024 1 Four-Unequal-Diamonds - 11 Refl Rods 3D View Note that Crossovers do NOT touch (between larger and smaller Diamonds)	enlarge 170KB, 486x1024 2 Four-Unequal-Diamonds - 11 Refl Rods Front View [1 large box = 2.5 inches]	enlarge 82KB, 241x1024 3 Four-Unequal-Diamonds - 11 Refl Rods Side View [1 large box = 2.5 inches]
enlarge 194KB, 1152x678 4 Four-Unequal-Diamonds - 11 Refl Rods UHF Raw Gain Max = 11.4 dBi F/B and F/R Ratios are Excellent, except low freqs	enlarge 210KB, 1152x678 5 Four-Unequal-Diamonds - 11 Refl Rods UHF SWR (300-ohms) Under 1.5	enlarge 237KB, 1152x678 6 Four-Unequal-Diamonds - 11 Refl Rods UHF Impedance
enlarge 306KB, 1024x1024 7 Four-Unequal-Diamonds - 11 Refl Rods Azimuthal Pattern at 470 MHz	enlarge 307KB, 1024x1024 8 Four-Unequal-Diamonds - 11 Refl Rods Azimuthal Pattern at 530 MHz	enlarge 307KB, 1024x1024 9 Four-Unequal-Diamonds - 11 Refl Rods Azimuthal Pattern at 590 MHz
enlarge 311KB, 1024x1024 10 Four-Unequal-Diamonds - 11 Refl Rods Azimuthal Pattern at 690 MHz	enlarge 307KB, 1024x1024 11 Four-Unequal-Diamonds - 11 Refl Rods Azimuthal Pattern at 698 MHz	enlarge 303KB, 1024x1024 12 Four-Unequal-Diamonds - 11 Refl Rods Azimuthal Pattern at 758 MHz
enlarge 303KB, 1024x1024 13 Four-Unequal-Diamonds - 11 Refl Rods Azimuthal Pattern at 806 MHz	enlarge 133KB, 483x1024 14 Four-Unequal-Diamonds - 11 Refl Rods Top View [1 large box = 1.25 inches]	enlarge 27KB, 791x1024 15 Four-Unequal-Diamonds - 11 Refl Rods 4nec2 File
enlarge 171KB, 1152x678 16 Four-Unequal-Diamonds - 11 Refl Rods Hi-VHF REVERSE Raw Gain = -0.1 to -1.4 dBi is a bit less than Rabbit Ears.	enlarge 210KB, 1152x678 17 Four-Unequal-Diamonds - 11 Refl Rods Hi-VHF SWR (300-ohms) is Excessive.	enlarge 241KB, 1152x678 18 Four-Unequal-Diamonds - 11 Refl Rods Hi-VHF Impedance
enlarge 321KB, 1024x1024 19 Four-Unequal-Diamonds - 11 Refl Rods Azimuthal Pattern at 174 MHz	enlarge 315KB, 1024x1024 20 Four-Unequal-Diamonds - 11 Refl Rods Azimuthal Pattern at 198 MHz	enlarge 313KB, 1024x1024 21 Four-Unequal-Diamonds - 11 Refl Rods Azimuthal Pattern at 216 MHz

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