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 holl_ands | Home > Loop Antennas incl Folded Dipole > 
LoVHF Hourglass-Loop + 3 ReflRods
Ch2, Ch3 and Ch6 Hourglass-Loops with Multiple Reflector Rods analyzed using 4nec2 after
Optimization using nikiml's Python Scripts.

For best performance on OTHER than Ch2, multiply Dimensions by Rescale Factor F = 57 / (Rescaled Freq).
For best performance on OTHER than Ch6, multiply Dimensions by Rescale Factor F = 85 / (Rescaled Freq).

a) Ch2 AWG10 Hourglass-Loop with 3 Reflector Rods.
On Ch2, Raw Gain = 9.7 to 9.0 dBi, F/B & F/R Ratio Minimum = 11.8 dB and SWR Under 2.7.
Total Hourglass Height=150.0-in, Width=91.25-in & Mid Gap=1.0-in.
Reflector Rod Lengths=108.5-in with Rod-Rod Spacings=70.0-in and RR-Bowtie Separation=42.25-in.

b) Ch2 AWG10 Hourglass-Loop with 3 Reflector Rods, Max Height = 8-feet ("SHORT").
On Ch2, Raw Gain = 8.4 to 7.8 dBi, F/B & F/R Ratio Minimum = 14.5 dB and SWR Under 2.3.
Total Hourglass Height=96.0-in, Width=96.0-in (Overly Constrained?) & Mid Gap=1.0-in.
Reflector Rod Lengths=96.0-in (Overly Constrained?) with Rod-Rod  Spacings=48.0-in
(Overly Constrained?) and RR-Bowtie Separation=37.25-in.  [Need To Rerun.]

c) Ch3 AWG10 Hourglass-Loop with 3 Reflector Rods.
On Ch3, Raw Gain = 9.9 to 9.2 dBi, F/B & F/R Ratio Minimum = 11.8 dB and SWR Under 2.8.
Total Hourglass Height=143.5-in, Width=82.0-in & Mid Gap=1.0-in.
Reflector Rod Lengths=97.25-in with Rod-Rod Spacings=69.25-in and RR-Bowtie Separation=38.25-in.

d) Ch3 AWG10 Hourglass-Loop with 3 Reflector Rods, Max Height = 8-feet ("SHORT").
On Ch3, Raw Gain = 8.7 to 8.1 dBi, F/B & F/R Ratio Minimum = 14.5 dB and SWR (300-ohms) Under 2.0.
Total Hourglass Height=96.0-in, Width=89.0-in & Mid Gap=1.0-in.
Reflector Rod Lengths=100.5-in with Rod-Rod Spacings=48.0-in and RR-Bowtie Separation=34.375-in.

e) Ch6 AWG10 Hourglass-Loop with 3 Reflector Rods, Max Height = 10-feet. [T.B.D.]


f) Ch6 AWG10 Hourglass-Loop with 3 Reflector Rods, Max Height = 7-feet ("SHORT").
On Ch6, Raw Gain = 9.2 to 8.8 dBi, F/B & F/R Ratio Minimum = 15.0 dB and SWR (300-ohms) Under 2.0.
Total Hourglass Height=84.0-in, Width=62.9-in & Mid Gap=1.0-in.
Reflector Rod Lengths=72.8-in with Rod-Rod Spacings=42.0-in and RR-Bowtie Separation=26.875-in.
Date(s): 19Jul2013. Album by holl_ands. 1 - 60 of 60 Total. 7635 Visits.
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Enlarge photo 1
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1
Ch2 Hourglass-Loop + 3ReflRods - OPT
3D View - Max Height = 150-inches


Enlarge photo 2
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2
Ch2 Hourglass-Loop + 3ReflRods - OPT
Front View - Max Height = 150-inches
[1 large square = 12.5 inches]


Enlarge photo 3
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3
Ch2 Hourglass-Loop + 3ReflRods - OPT
Top View - Max Height = 150-inches
[1 large square = 12.5 inches]


Enlarge photo 4
enlarge 184KB, 1152x685
4
Ch2 Hourglass-Loop + 3ReflRods - OPT
Raw Gain = 9.7 to 9.0 dBi on Ch2
F/B & F/R Ratio Minimum = 11.8 dB on Ch2


Enlarge photo 5
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5
Ch2 Hourglass-Loop + 3ReflRods - OPT
SWR (300-ohms) Under 2.7 on Ch2


Enlarge photo 6
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6
Ch2 Hourglass-Loop + 3ReflRods - OPT
Ch2-6 Impedance


Enlarge photo 7
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7
Ch2 Hourglass-Loop + 3ReflRods - OPT
Azimuthal Pattern at 54 MHz


Enlarge photo 8
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8
Ch2 Hourglass-Loop + 3ReflRods - OPT
Azimuthal Pattern at 57 MHz


Enlarge photo 9
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9
Ch2 Hourglass-Loop + 3ReflRods - OPT
Azimuthal Pattern at 60 MHz


Enlarge photo 10
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10
Ch2 Hourglass-Loop + 3ReflRods - OPT
Side View - Max Height = 150-inches
[1 large square = 12.5 inches]


Enlarge Microsoft Word Document 11
enlarge 29KB, 791x1024
DOC11
Ch2 Hourglass-Loop + 3ReflRods - OPT
4nec2 File - Max Height = 150-inches


Enlarge Microsoft Word Document 12
enlarge 22KB, 791x1024
DOC12
Ch2 Hourglass-Loop + 3ReflRods - OPT
Contents of Python Control *.bat text File


Enlarge photo 13
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13
Ch2 Hourglass-Loop + 3RR - SHORT OPT
3D View - Max Height = 96-inches


Enlarge photo 14
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14
Ch2 Hourglass-Loop + 3RR - SHORT OPT
Front View - Max Height = 96-inches
[1 large square = 12.5 inches]


Enlarge photo 15
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15
Ch2 Hourglass-Loop + 3RR - SHORT OPT
Top View - Max Height = 96-inches
[1 large square = 12.5 inches]


Enlarge photo 16
enlarge 189KB, 1152x686
16
Ch2 Hourglass-Loop + 3RR - SHORT OPT
Raw Gain = 8.4-7.8 dBi on Ch2
F/B & F/R Ratio Minimum = 14.5 dB


Enlarge photo 17
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17
Ch2 Hourglass-Loop + 3RR - SHORT OPT
SWR (300-ohms) Under 2.0


Enlarge photo 18
enlarge 142KB, 1024x896
18
Ch2 Hourglass-Loop + 3RR - SHORT OPT
3D Pattern (Horizontal Polarization)


Enlarge photo 19
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19
Ch2 Hourglass-Loop + 3RR - SHORT OPT
Azimuthal Pattern at 54 MHz


Enlarge photo 20
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20
Ch2 Hourglass-Loop + 3RR - SHORT OPT
Azimuthal Pattern at 57 MHz


Enlarge photo 21
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21
Ch2 Hourglass-Loop + 3RR - SHORT OPT
Azimuthal Pattern at 60 MHz


Enlarge photo 22
enlarge 122KB, 510x1024
22
Ch2 Hourglass-Loop + 3RR - SHORT OPT
Side View - Max Height = 96-inches
[1 large square = 12.5 inches]


Enlarge Microsoft Word Document 23
enlarge 28KB, 791x1024
DOC23
Ch2 Hourglass-Loop + 3RR - SHORT OPT
4nec2 File - Max Height = 96-inches


Enlarge Microsoft Word Document 24
enlarge 22KB, 791x1024
DOC24
Ch2 Hourglass-Loop + 3RR - SHORT OPT
Contents of Python Control *.bat File


Enlarge photo 25
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25
Ch3 Hourglass-Loop + 3ReflRods - OPT
3D View


Enlarge photo 26
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26
Ch3 Hourglass-Loop + 3ReflRods - OPT
Front View
[1 large square = 12.5 inches]


Enlarge photo 27
enlarge 120KB, 504x1024
27
Ch3 Hourglass-Loop + 3ReflRods - OPT
Top View
[1 large square = 12.5 inches]


Enlarge photo 28
enlarge 197KB, 1152x685
28
Ch3 Hourglass-Loop + 3ReflRods - OPT
Raw Gain = 9.9 to 9.2 dBi on Ch3
F/B & F/R Ratio Minimum = 11.8 dB


Enlarge photo 29
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29
Ch3 Hourglass-Loop + 3ReflRods - OPT
SWR (300-ohms) Under 2.8 on Ch3
[Chart begins on 57 MHz vice usual 54 MHz]


Enlarge photo 30
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30
Ch3 Hourglass-Loop + 3ReflRods - OPT
Ch3-6 Impedance


Enlarge photo 31
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31
Ch3 Hourglass-Loop + 3ReflRods - OPT
Azimuthal Pattern at 60 MHz


Enlarge photo 32
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32
Ch3 Hourglass-Loop + 3ReflRods - OPT
Azimuthal Pattern at 63 MHz


Enlarge photo 33
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33
Ch3 Hourglass-Loop + 3ReflRods - OPT
Azimuthal Pattern at 66 MHz


Enlarge photo 34
enlarge 102KB, 358x1024
34
Ch3 Hourglass-Loop + 3ReflRods - OPT
Side View
[1 large square = 12.5 inches]


Enlarge Microsoft Word Document 35
enlarge 29KB, 791x1024
DOC35
Ch3 Hourglass-Loop + 3ReflRods - OPT
4nec2 File


Enlarge Microsoft Word Document 36
enlarge 22KB, 791x1024
DOC36
Ch3 Hourglass-Loop + 3ReflRods - OPT
Contents of Python Control *.bat text File


Enlarge photo 37
enlarge 91KB, 903x1024
37
Ch3 Hourglass-Loop + 3RR - SHORT OPT
3D View - Max Height = 96-inches


Enlarge photo 38
enlarge 257KB, 1009x1024
38
Ch3 Hourglass-Loop + 3RR - SHORT OPT
Front View - Max Height = 96-inches
[1 large square = 12.5 inches]


Enlarge photo 39
enlarge 117KB, 487x1024
39
Ch3 Hourglass-Loop + 3RR - SHORT OPT
Top View - Max Height = 96-inches
[1 large square = 12.5 inches]


Enlarge photo 40
enlarge 201KB, 1152x685
40
Ch3 Hourglass-Loop + 3RR - SHORT OPT
Raw Gain = 8.7 to 8.1 dBi on Ch3
F/B & F/R Ratio Minimum = 14.5 dB on Ch3


Enlarge photo 41
enlarge 199KB, 1152x685
41
Ch3 Hourglass-Loop + 3RR - SHORT OPT
SWR (300-ohm) Under 2.0 on Ch3


Enlarge photo 42
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42
Ch3 Hourglass-Loop + 3RR - SHORT OPT
Ch2-6 Impedance


Enlarge photo 43
enlarge 306KB, 1024x1024
43
Ch3 Hourglass-Loop + 3RR - SHORT OPT
Azimuthal Pattern at 60 Hz


Enlarge photo 44
enlarge 306KB, 1024x1024
44
Ch3 Hourglass-Loop + 3RR - SHORT OPT
Azimuthal Pattern at 63 Hz


Enlarge photo 45
enlarge 307KB, 1024x1024
45
Ch3 Hourglass-Loop + 3RR - SHORT OPT
Azimuthal Pattern at 66 Hz


Enlarge photo 46
enlarge 117KB, 494x1024
46
Ch3 Hourglass-Loop + 3RR - SHORT OPT
Side View - Max Height = 96-inches
[1 large square = 12.5 inches]


Enlarge Microsoft Word Document 47
enlarge 29KB, 791x1024
DOC47
Ch3 Hourglass-Loop + 3RR - SHORT OPT
4nec2 File - Max Height = 96-inches


Enlarge Microsoft Word Document 48
enlarge 22KB, 791x1024
DOC48
Ch3 Hourglass-Loop + 3RR - SHORT OPT
Contents of Python Control *.bat text File


Enlarge photo 49
enlarge 74KB, 816x1024
49
Ch6 Hourglass-Loop + 3RR - SHORT OPT
3D View - Max Height = 84-inches


Enlarge photo 50
enlarge 207KB, 871x1024
50
Ch6 Hourglass-Loop + 3RR - SHORT OPT
Front View - Max Height = 84-inches
[1 large square = 12.5 inches]


Enlarge photo 51
enlarge 101KB, 451x1024
51
Ch6 Hourglass-Loop + 3RR - SHORT OPT
Top View - Max Height = 84-inches
[1 large square = 12.5 inches]


Enlarge photo 52
enlarge 196KB, 1152x686
52
Ch6 Hourglass-Loop + 3RR - SHORT OPT
Raw Gain = 9.2 to 9.8 dBi on Ch6
F/B & F/R Ratio Minimum = 15 dB


Enlarge photo 53
enlarge 209KB, 1152x686
53
Ch6 Hourglass-Loop + 3RR - SHORT OPT
Ch6+FM SWR (300-ohms) Under 2.0


Enlarge photo 54
enlarge 241KB, 1152x686
54
Ch6 Hourglass-Loop + 3RR - SHORT OPT
Ch2-6 + FM Impedance


Enlarge photo 55
enlarge 305KB, 1024x1024
55
Ch6 Hourglass-Loop + 3RR - SHORT OPT
Azimuthal Pattern at 82 MHz (Ch6)


Enlarge photo 56
enlarge 305KB, 1024x1024
56
Ch6 Hourglass-Loop + 3RR - SHORT OPT
Azimuthal Pattern at 85 MHz (Ch6)


Enlarge photo 57
enlarge 305KB, 1024x1024
57
Ch6 Hourglass-Loop + 3RR - SHORT OPT
Azimuthal Pattern at 88 MHz (Ch6)


Enlarge photo 58
enlarge 93KB, 423x1024
58
Ch6 Hourglass-Loop + 3RR - SHORT OPT
Side View - Max Height = 84-inches
[1 large square = 12.5 inches]


Enlarge Microsoft Word Document 59
enlarge 29KB, 791x1024
DOC59
Ch6 Hourglass-Loop + 3RR - SHORT OPT
4nec2 File - Max Height = 84-inches


Enlarge Microsoft Word Document 60
enlarge 22KB, 791x1024
DOC60
Ch6 Hourglass-Loop + 3RR - SHORT OPT
Contents of Python Control *.bat Script


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