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Hi-VHF+UHF Stick Dipole - No Reflector
Hi-VHF+UHF Stick Dipole (NO Reflector) analyzed using 4nec2.

Two versions were analyzed:
a) Optimized for Hi-VHF Band,
b) Jointly Optimized for Hi-VHF & UHF Bands, using nikiml's Optimization Python Scripts.

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a) Optimized for Hi-VHF Band: Overall Length = 28.2-inches, 1/2-in Copper Tubing.
VERY POOR for UHF Band:

Hi-VHF Raw Gain = 1.8 to 2.0 dBi and SWR (75-ohms) Under 2.8.  SWR (300-ohms) = 5.3 to 2.5.

UHF Raw Gain = 4.5 dB at 470 MHz, rolling off to below 0 dBi higher than 570 MHz and
SWR (75-ohms) Excessive except Under 2.7 for 555 to 625 MHz.
UHF SWR (300-ohms) about 6 at 470 MHz, decreasing to below 2.7 at 590 MHz and above,
where there is only negative Raw Gain.

###############################################
b) Jointly Optimized for Hi-VHF and UHF Bands: Length = 25.6-inches, 1/2-in Copper Tubing.
VERY POOR for UHF Band.

Hi-VHF Raw Gain = 2.0 to 2.2 dBi and SWR (75-ohms) = 4.9 to 1.4, excessive on lower channels,
while SWR (300-ohms) = 8.0 to 3.5 is even worse.

UHF Raw Gain = 4-5 dBi in lower UHF Band and then rolls off above about 580 MHz,
SWR (75-ohms) Excessive, except under 2.7 from 605 to 698 MHz, where there is only negative Raw Gain.
SWR (300-ohms) Excessive, except under 2.7 from 655 to 698 MHz, where there is only negative Raw Gain.
Date(s): 24 Jul 2014. Album by holl_ands. 1 - 36 of 36 Total. 3658 Visits.
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Enlarge photo 1
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Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
3D View


Enlarge photo 2
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Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Front View
[1 large square = 5 inches]


Enlarge Microsoft Word Document 3
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DOC3
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
4nec2 File


Enlarge photo 4
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4
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Hi-VHF Raw Gain = 1.8 to 2.0 dBi


Enlarge photo 5
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5
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Hi-VHF SWR (75-ohms) Under 2.8


Enlarge photo 6
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6
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Ch13-69 Impedance


Enlarge photo 7
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Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Ch13-69 Raw Gain Increases into lower UHF Band
and Rolls Off beyond about 550 MHz


Enlarge photo 8
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8
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Ch13-69 SWR (75-ohms) is only acceptable
in Hi-VHF Band and about 550-630 MHz


Enlarge photo 9
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9
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Ch13-69 SWR (300-ohms) is NOT acceptable
in Hi-VHF Band, but is for 570-698 MHz


Enlarge photo 10
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10
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Azimuthal Pattern at 174 MHz


Enlarge photo 11
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11
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Azimuthal Pattern at 198 MHz


Enlarge photo 12
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12
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Azimuthal Pattern at 216 MHz


Enlarge photo 13
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13
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Azimuthal Pattern at 474 MHz


Enlarge photo 14
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14
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Azimuthal Pattern at 528 MHz


Enlarge photo 15
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15
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Azimuthal Pattern at 582 MHz


Enlarge photo 16
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16
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Azimuthal Pattern at 612 MHz


Enlarge photo 17
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17
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Azimuthal Pattern at 696 MHz


Enlarge photo 18
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18
Hi-VHF+UHF Stick Dipole
Optimized for Hi-VHF Band
Azimuthal Pattern at 804 MHz


Enlarge photo 19
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Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
3D View


Enlarge photo 20
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20
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Front View
[1 large square = 5 inches]


Enlarge Microsoft Word Document 21
enlarge 27KB, 791x1024
DOC21
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
4nec2 File


Enlarge photo 22
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22
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Hi-VHF Raw Gain = 2.0 to 2.2 dBi


Enlarge photo 23
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23
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Hi-VHF SWR (75-ohms) unacceptable
on lower freqs


Enlarge photo 24
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24
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Ch13-69 Impedance


Enlarge photo 25
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25
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Ch13-69 Raw Gain


Enlarge photo 26
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Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Ch13-69 SWR (75-ohms) increases unacceptably
in Hi-VHF Band, UHF Band Shifts up


Enlarge photo 27
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27
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Ch13-69 SWR (300-ohms) unacceptable
in Both Hi-VHF & UHF Bands


Enlarge photo 28
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28
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Azimuthal Pattern at 174 MHz


Enlarge photo 29
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29
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Azimuthal Pattern at 198 MHz


Enlarge photo 30
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30
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Azimuthal Pattern at 216 MHz


Enlarge photo 31
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31
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Azimuthal Pattern at 474 MHz


Enlarge photo 32
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32
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Azimuthal Pattern at 528 MHz


Enlarge photo 33
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33
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Azimuthal Pattern at 582 MHz


Enlarge photo 34
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34
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Azimuthal Pattern at 612 MHz


Enlarge photo 35
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35
Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Azimuthal Pattern at 696 MHz


Enlarge photo 36
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Hi-VHF+UHF Stick Dipole
Joint Optimization Hi-VHF & UHF
Azimuthal Pattern at 804 MHz


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