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 holl_ands | Home > Multi-Bay Bowtie Antennas > UHF 4-Bay Bowties - NO Reflectors > 
NEW-UHF Free-Form 4-Bay + NoRefl
NEW-UHF [470-608 MHz] Free-Form 4-Bay with No Reflector analyzed using 4nec2
after finding "Best" Dimensions using nikiml's Python Optimization Scripts.

UHF Raw Gain = 10.9 to 12.8 to 12.7 dBi and SWR (300-ohms) under 2.5.
Hi-VHF Raw Gain = 3.5 to 3.4 dBi and SWR (300-ohms) = 3.4 to 4.1 [A bit Excessive].

DIMENSION STATEMENTS: [May Round to nearest 1/4-in]
' Radius (in inches) of BOWTIE elements:
SY Rbow=0.051  [AWG10]
' Radius (in inches) of FEEDLINE wires:
SY Rfeed=0.051  [AWG10]
' Separation at Crossover:
SY Hop=1.0
' Conductivity (Copper=3.0e7, Alum=2.0e7, StainlessSteel=1.67e7):
SY Cond=3e+07
' Distance between the centers of the two INNER bowties:
SY ZBowII=13.62
' From center of INNER bowtie to center of OUTER bowtie:
SY ZBowOI=12.55
' INNER Bow Whisker Length (lose some in bend):
SY BowLeni=12.97
' OUTER Bow Whisker Length (lose some in bend):
SY BowLeno=8.17
' INNER Bow Forward Sweep distance at tip of the whisker:
SY BowSwpi=0  [Not used in this model]
' OUTER Bow Forward Sweep distance at tip of the whisker:
SY BowSwpo=0  [Not used in this model]
' INNER Bow Tine Separation:
SY TineSepi=8.54
' OUTER Bow Tine Separation:
SY TineSepo=7.61
' Separation between two FEEDLINE wires:
SY FeedSep=3.85
' From Center of Feedline Cross-Over to Center of OUTER Bowtie:
SY ZCross=1.25

UPDATE (26Nov2017): Uploaded Images with improved viewability (esp. Thumbnails)
with NO Change to content.

UPDATE (17Aug2019): Added Dimension Statements.
Date(s): 28Jul2017. Album by holl_ands. 1 - 16 of 16 Total. 3535 Visits.
Start SlideshowTo order prints and photo-products: 1. Select photos. 2. Click Order. 3. Select products.Select images and click to download to your computer 
Enlarge photo 1
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1
NEW-UHF Free-Form 4-Bay + NoRefl
3D View


Enlarge photo 2
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2
NEW-UHF Free-Form 4-Bay + NoRefl
Front View
[1 large square = 5-inchess]


Enlarge photo 3
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3
NEW-UHF Free-Form 4-Bay + NoRefl
Top View
[1 large square = 5-inchess]


Enlarge photo 4
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4
NEW-UHF Free-Form 4-Bay + NORefl
UHF Raw Gain = 10.9 to 12.8 to 12.7 dBi


Enlarge photo 5
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5
NEW-UHF Free-Form 4-Bay + NORefl
UHF SWR (300-ohms) Under 2.5


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6
NEW-UHF Free-Form 4-Bay + NORefl
UHF Impedance


Enlarge photo 7
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7
NEW-UHF Free-Form 4-Bay + NORefl
Azimuthal Pattern at 470 MHz


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8
NEW-UHF Free-Form 4-Bay + NORefl
Azimuthal Pattern at 530 MHz


Enlarge photo 9
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9
NEW-UHF Free-Form 4-Bay + NORefl
Azimuthal Pattern at 590 MHz


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10
NEW-UHF Free-Form 4-Bay + NORefl
Azimuthal Pattern at 608 MHz


Enlarge photo 11
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11
NEW-UHF Free-Form 4-Bay + NORefl
Azimuthal Pattern at 650 MHz


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12
NEW-UHF Free-Form 4-Bay + NORefl
Azimuthal Pattern at 698 MHz


Enlarge photo 13
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13
NEW-UHF Free-Form 4-Bay + NoRefl
Side View
[1 large square = 5-inchess]


Enlarge Microsoft Word Document 14
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DOC14
NEW-UHF Free-Form 4-Bay + NORefl
4nec2 Text File


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DOC15
NEW-UHF Free-Form 4-Bay + NORefl
EVAL's Performance Text Summary


Enlarge HTML Document 16
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HTML16
NEW-UHF Free-Form 4-Bay + NORefl
EVAL's *.html Performance File


 
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