Lo-VHF Tri-Folded Dipoles - OPT

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Lo-VHF Tri-Folded Dipoles - OPT

Lo-VHF Tri-Folded Dipoles analyzed using 4nec2.

FYI: Ch6 Center Freq = 85 MHz so 1/2-WL = 69.43-in.

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a) Ch6 Tri-Folded [Bottom Fed] Dipole with "best" Dimensions for 600-ohm Load
determined using nikiml's Python Optimization Scrips, presuming AWG10
[for a typical indoor/attic location]:

L2=65.59-in = Folded Dipole Overall Element Length.

Ch6 (82-88 MHz) Raw Gain = 2.1 to 2.2 dBi and SWR (600-ohms) = 1.2 to 1.6.
SWR (300-ohms) = 1.7 to 1.2 to 2.6 is also Acceptable...[and can reduce if add Reflector].

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b) Ch6 Tri-Folded [Bottom Fed] Dipole with "best" Dimensions for 300-ohm Load
determined using nikiml's Python Optimization Scrips, presuming AWG10
[for a typical indoor/attic location]:

L2=63.61-in = Folded Dipole Overall Element Length.

Ch6 (82-88 MHz) Raw Gain = 2.1 to 2.2 dBi and SWR (300-ohms) = 1.9 to 1.7 to 2.0.

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d) Ch6 Tri-Folded [Center Fed] Dipole with "best" Dimensions determined using
nikiml's Python Optimization Scrips, presuming AWG10 for an indoor/attic location:

L2=62.23-in = Folded Dipole Overall Element Length.

Ch6 (82-88 MHz) Raw Gain = 2.1 to 2.2 dBi and SWR (1200-ohms) = 1.2 to 1.4.

.

Date(s): 9 May 2018. Album by holl_ands. 1 - 43 of 43 Total. 1126 Visits.

enlarge 56KB, 1152x651 1 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] 3D View	enlarge 95KB, 1152x257 2 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] Front View [1 large square = 5-inches]	enlarge 28KB, 791x1024 3 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] 4nec2 text File includes Dimensions
enlarge 171KB, 1152x664 4 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] Ch6 (82-88 MHz) Raw Gain = 2.1 to 2.2 dBi	enlarge 203KB, 1152x664 5 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] Ch6 (82-88 MHz) SWR (600-ohms) = 1.2 to 1.6	enlarge 204KB, 1152x664 6 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] Ch6 (82-88 MHz) SWR (If 300-ohms) = 1.7 to 1.2 to 2.6 [Also Acceptable]
enlarge 318KB, 1024x1024 7 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] Azimuthal Pattern at 82 MHz	enlarge 318KB, 1024x1024 8 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] Azimuthal Pattern at 85 MHz	enlarge 318KB, 1024x1024 9 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] Azimuthal Pattern at 88 MHz
enlarge 299KB, 1024x1024 10 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] Elevation Pattern at 82 MHz	enlarge 296KB, 1024x1024 11 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] Elevation Pattern at 85 MHz	enlarge 299KB, 1024x1024 12 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] Elevation Pattern at 88 MHz
enlarge 231KB, 1152x664 13 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] Ch6 (82-88 MHz) Impedance	enlarge 28KB, 791x1024 14 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] EVAL Performance Summary text File	enlarge 43KB, 791x1024 15 Ch6 Tri-Folded Dipole - OPT for 600-ohm [BOTTOM FED] EVAL Performance Summary *.html File [Download to View, i.e. "Save Link As"]
enlarge 52KB, 1024x664 16 Ch6 Tri-Folded Dipole - OPT for 300-ohm [BOTTOM FED] 3D View	enlarge 106KB, 1152x259 17 Ch6 Tri-Folded Dipole - OPT for 300-ohm [BOTTOM FED] Front View [1 large square = 5-inches]	enlarge 28KB, 791x1024 18 Ch6 Tri-Folded Dipole - OPT for 300-ohm [BOTTOM FED] 4nec2 text File includes Dimensions
enlarge 154KB, 1024x645 19 Ch6 Tri-Folded Dipole - OPT for 300-ohm [BOTTOM FED] Ch6 (82-88 MHz) Raw Gain = 2.1 to 2.2 dBi	enlarge 230KB, 1152x664 20 Ch6 Tri-Folded Dipole - OPT for 300-ohm [BOTTOM FED] Ch6 (82-88 MHz) SWR (300-ohms) = 1.9 to 1.7 to 2.0	enlarge 263KB, 1152x664 21 Ch6 Tri-Folded Dipole - OPT for 300-ohm [BOTTOM FED] Ch6 (82-88 MHz) Impedance
enlarge 364KB, 1024x1024 22 Ch6 Tri-Folded Dipole - OPT for 300-ohm [BOTTOM FED] Azimuthal Pattern at 82 MHz	enlarge 364KB, 1024x1024 23 Ch6 Tri-Folded Dipole - OPT for 300-ohm [BOTTOM FED] Azimuthal Pattern at 85 MHz	enlarge 364KB, 1024x1024 24 Ch6 Tri-Folded Dipole - OPT for 300-ohm [BOTTOM FED] Azimuthal Pattern at 88 MHz
enlarge 341KB, 1024x1024 25 Ch6 Tri-Folded Dipole - OPT for 300-ohm [BOTTOM FED] Elevation Pattern at 82 MHz	enlarge 341KB, 1024x1024 26 Ch6 Tri-Folded Dipole - OPT for 300-ohm [BOTTOM FED] Elevation Pattern at 85 MHz	enlarge 342KB, 1024x1024 27 Ch6 Tri-Folded Dipole - OPT for 300-ohm [BOTTOM FED] Elevation Pattern at 88 MHz
enlarge 28KB, 791x1024 28 Ch6 Tri-Folded Dipole - OPT for 300-ohm [BOTTOM FED] EVAL Performance Summary text File	enlarge 43KB, 791x1024 29 Ch6 Tri-Folded Dipole - OPT for 300-ohm [BOTTOM FED] EVAL Performance Summary *.html File	enlarge 50KB, 1152x617 30 Ch6 Tri-Folded Dipole - OPT for 1200-ohm [CENTER FED] 3D View
enlarge 107KB, 1152x293 31 Ch6 Tri-Folded Dipole - OPT for 1200-ohm [CENTER FED] Front View [1 large square = 5-inches]	enlarge 28KB, 791x1024 32 Ch6 Tri-Folded Dipole - OPT for 1200-ohm [CENTER FED] 4nec2 text File includes Dimensions	enlarge 28KB, 791x1024 33 Ch6 Tri-Folded Dipole - OPT for 1200-ohm [CENTER FED] EVAL Performance Summary text File
enlarge 190KB, 1152x664 34 Ch6 Tri-Folded Dipole - OPT for 1200-ohm [CENTER FED] Ch6 (82-88 MHz) Raw Gain = 2.1 to 2.2 dBi	enlarge 228KB, 1152x664 35 Ch6 Tri-Folded Dipole - OPT for 1200-ohm [CENTER FED] Ch6 (82-88 MHz) SWR (1200-ohms) = 1.2 to 1.2 to 1.4	enlarge 268KB, 1152x664 36 Ch6 Tri-Folded Dipole - OPT for 1200-ohm [CENTER FED] Ch6 (82-88 MHz) Impedance
enlarge 363KB, 1024x1024 37 Ch6 Tri-Folded Dipole - OPT for 1200-ohm [CENTER FED] Azimuthal Pattern at 82 MHz	enlarge 363KB, 1024x1024 38 Ch6 Tri-Folded Dipole - OPT for 1200-ohm [CENTER FED] Azimuthal Pattern at 85 MHz	enlarge 364KB, 1024x1024 39 Ch6 Tri-Folded Dipole - OPT for 1200-ohm [CENTER FED] Azimuthal Pattern at 88 MHz
enlarge 339KB, 1024x1024 40 Ch6 Tri-Folded Dipole - OPT for 1200-ohm [CENTER FED] Elevation Pattern at 82 MHz	enlarge 333KB, 1024x1024 41 Ch6 Tri-Folded Dipole - OPT for 1200-ohm [CENTER FED] Elevation Pattern at 85 MHz	enlarge 334KB, 1024x1024 42 Ch6 Tri-Folded Dipole - OPT for 1200-ohm [CENTER FED] Elevation Pattern at 88 MHz
enlarge 31KB, 791x1024 43 Ch6 Tri-Folded Dipole - OPT for 1200-ohm [CENTER FED] EVAL Performance Summary *.html File

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