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 holl_ands | Home > Loop Antennas incl Folded Dipole > 
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.

#####################################
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].

#####################################
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.

#####################################
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.



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Date(s): 9 May 2018. Album by holl_ands. 1 - 43 of 43 Total. 0 Visits.
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Enlarge photo 1
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1
Ch6 Tri-Folded Dipole - OPT for 600-ohm
[BOTTOM FED]
3D View


Enlarge photo 2
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2
Ch6 Tri-Folded Dipole - OPT for 600-ohm
[BOTTOM FED]

Front View
[1 large square = 5-inches]


Enlarge Microsoft Word Document 3
enlarge 28KB, 791x1024
DOC3
Ch6 Tri-Folded Dipole - OPT for 600-ohm
[BOTTOM FED]
4nec2 text File includes Dimensions


Enlarge photo 4
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 photo 5
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 photo 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 photo 7
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7
Ch6 Tri-Folded Dipole - OPT for 600-ohm
[BOTTOM FED]

Azimuthal Pattern at 82 MHz


Enlarge photo 8
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8
Ch6 Tri-Folded Dipole - OPT for 600-ohm
[BOTTOM FED]

Azimuthal Pattern at 85 MHz


Enlarge photo 9
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9
Ch6 Tri-Folded Dipole - OPT for 600-ohm
[BOTTOM FED]

Azimuthal Pattern at 88 MHz


Enlarge photo 10
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10
Ch6 Tri-Folded Dipole - OPT for 600-ohm
[BOTTOM FED]

Elevation Pattern at 82 MHz


Enlarge photo 11
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11
Ch6 Tri-Folded Dipole - OPT for 600-ohm
[BOTTOM FED]

Elevation Pattern at 85 MHz


Enlarge photo 12
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12
Ch6 Tri-Folded Dipole - OPT for 600-ohm
[BOTTOM FED]

Elevation Pattern at 88 MHz


Enlarge photo 13
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13
Ch6 Tri-Folded Dipole - OPT for 600-ohm
[BOTTOM FED]

Ch6 (82-88 MHz) Impedance


Enlarge Microsoft Word Document 14
enlarge 28KB, 791x1024
DOC14
Ch6 Tri-Folded Dipole - OPT for 600-ohm
[BOTTOM FED]
EVAL Performance Summary text File


Enlarge HTML Document 15
enlarge 43KB, 791x1024
HTML15
Ch6 Tri-Folded Dipole - OPT for 600-ohm
[BOTTOM FED]
EVAL Performance Summary *.html File
[Download to View, i.e. "Save Link As"]


Enlarge photo 16
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16
Ch6 Tri-Folded Dipole - OPT for 300-ohm
[BOTTOM FED]
3D View


Enlarge photo 17
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17
Ch6 Tri-Folded Dipole - OPT for 300-ohm
[BOTTOM FED]

Front View
[1 large square = 5-inches]


Enlarge Microsoft Word Document 18
enlarge 28KB, 791x1024
DOC18
Ch6 Tri-Folded Dipole - OPT for 300-ohm
[BOTTOM FED]
4nec2 text File includes Dimensions


Enlarge photo 19
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 photo 20
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 photo 21
enlarge 263KB, 1152x664
21
Ch6 Tri-Folded Dipole - OPT for 300-ohm
[BOTTOM FED]
Ch6 (82-88 MHz) Impedance


Enlarge photo 22
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22
Ch6 Tri-Folded Dipole - OPT for 300-ohm
[BOTTOM FED]
Azimuthal Pattern at 82 MHz


Enlarge photo 23
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23
Ch6 Tri-Folded Dipole - OPT for 300-ohm
[BOTTOM FED]
Azimuthal Pattern at 85 MHz


Enlarge photo 24
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24
Ch6 Tri-Folded Dipole - OPT for 300-ohm
[BOTTOM FED]
Azimuthal Pattern at 88 MHz


Enlarge photo 25
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25
Ch6 Tri-Folded Dipole - OPT for 300-ohm
[BOTTOM FED]
Elevation Pattern at 82 MHz


Enlarge photo 26
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26
Ch6 Tri-Folded Dipole - OPT for 300-ohm
[BOTTOM FED]
Elevation Pattern at 85 MHz


Enlarge photo 27
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27
Ch6 Tri-Folded Dipole - OPT for 300-ohm
[BOTTOM FED]
Elevation Pattern at 88 MHz


Enlarge Microsoft Word Document 28
enlarge 28KB, 791x1024
DOC28
Ch6 Tri-Folded Dipole - OPT for 300-ohm
[BOTTOM FED]
EVAL Performance Summary text File


Enlarge HTML Document 29
enlarge 43KB, 791x1024
HTML29
Ch6 Tri-Folded Dipole - OPT for 300-ohm
[BOTTOM FED]
EVAL Performance Summary *.html File


Enlarge photo 30
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30
Ch6 Tri-Folded Dipole - OPT for 1200-ohm
[CENTER FED]
3D View


Enlarge photo 31
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31
Ch6 Tri-Folded Dipole - OPT for 1200-ohm
[CENTER FED]

Front View
[1 large square = 5-inches]


Enlarge Microsoft Word Document 32
enlarge 28KB, 791x1024
DOC32
Ch6 Tri-Folded Dipole - OPT for 1200-ohm
[CENTER FED]
4nec2 text File includes Dimensions


Enlarge Microsoft Word Document 33
enlarge 28KB, 791x1024
DOC33
Ch6 Tri-Folded Dipole - OPT for 1200-ohm
[CENTER FED]
EVAL Performance Summary text File


Enlarge photo 34
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 photo 35
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 photo 36
enlarge 268KB, 1152x664
36
Ch6 Tri-Folded Dipole - OPT for 1200-ohm
[CENTER FED]
Ch6 (82-88 MHz) Impedance


Enlarge photo 37
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37
Ch6 Tri-Folded Dipole - OPT for 1200-ohm
[CENTER FED]
Azimuthal Pattern at 82 MHz


Enlarge photo 38
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38
Ch6 Tri-Folded Dipole - OPT for 1200-ohm
[CENTER FED]
Azimuthal Pattern at 85 MHz


Enlarge photo 39
enlarge 364KB, 1024x1024
39
Ch6 Tri-Folded Dipole - OPT for 1200-ohm
[CENTER FED]
Azimuthal Pattern at 88 MHz


Enlarge photo 40
enlarge 339KB, 1024x1024
40
Ch6 Tri-Folded Dipole - OPT for 1200-ohm
[CENTER FED]
Elevation Pattern at 82 MHz


Enlarge photo 41
enlarge 333KB, 1024x1024
41
Ch6 Tri-Folded Dipole - OPT for 1200-ohm
[CENTER FED]
Elevation Pattern at 85 MHz


Enlarge photo 42
enlarge 334KB, 1024x1024
42
Ch6 Tri-Folded Dipole - OPT for 1200-ohm
[CENTER FED]
Elevation Pattern at 88 MHz


Enlarge HTML Document 43
enlarge 31KB, 791x1024
HTML43
Ch6 Tri-Folded Dipole - OPT for 1200-ohm
[CENTER FED]
EVAL Performance Summary *.html File


 
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