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Hi-VHF Bi-Quad 4ReflRods - nikiml
Hi-VHF Bi-Quad with 4 Reflector Rods analyzed using 4nec2.
Optimized for entire Hi-VHF Band, see model "BQ4V" on nikml website:
http://clients.teksavvy.com/~nickm/biquads/bq4V.html

Raw Gain is 10.2-9.5 dBi with SWR under 2.2.
Overall Size = 57"H x 46.7"W
Date(s): 20 Aug 2011. Album by holl_ands. 1 - 11 of 11 Total. 6954 Visits.
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Enlarge photo 1
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1
Hi-VHF Bi-Quad with 4 Reflector Rods
3D View
Inner Diagonals are 24-in long.
Outer Diagonals are 16.5-in long.
Feedpoint Gap = 2.6-in.


Enlarge photo 2
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2
Hi-VHF Bi-Quad with 4 Reflector Rods
Front View
Inner two Rods are 46.7-in long.
Outer two Rods are 32.3-in long.
[1 small box = 1.0-inch]
[1 big box = 5.0-inch]


Enlarge photo 3
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3
Hi-VHF Bi-Quad with 4 Reflector Rods
Side View
Reflector Rods are 12-in behind the Bi-Quad.
[1 small box = 1.0-inch]
[1 big box = 5.0-inch]


Enlarge photo 4
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4
Hi-VHF Bi-Quad with 4 Reflector Rods
Hi-VHF Raw Gain = 10.2 to 9.5 dBi


Enlarge photo 5
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5
Hi-VHF Bi-Quad with 4 Reflector Rods
Hi-VHF SWR (300-ohm) under 2.2


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6
Hi-VHF Bi-Quad with 4 Reflector Rods
Hi-VHF Impedance


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Hi-VHF Bi-Quad with 4 Reflector Rods
Azimuthal Pattern at 174 MHz


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Hi-VHF Bi-Quad with 4 Reflector Rods
Azimuthal Pattern at 198 MHz


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9
Hi-VHF Bi-Quad with 4 Reflector Rods
Azimuthal Pattern at 216 MHz


Enlarge Microsoft Word Document 10
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DOC10
Hi-VHF Bi-Quad with 4 Reflector Rods
4nec2 File


Enlarge photo 11
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11
Hi-VHF Bi-Quad with 4 Reflector Rods
Top View
Reflector Rods are 12-in behind the Bi-Quad.
[1 small box = 1.0-inch]
[1 big box = 5.0-inch]


 
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  Sign the Guestbook. Displaying 2 of 2 entries.
I really like your Nikiml's Antenna Pages. Great easy to understand graphics. (Spread sheets are hard for me to understand.)
 Have you tried running your VHF bi-quads in the UHF band?
 I made a bi-quad with the bottom loop being 15"x4 (60") and the top loop being 13"x4 (52") it works well for both VHF-hi and UHF. I need a bi-directional antenna so I haven't tried reflectors. (If I were to try a reflector I would start by setting them about 15" behind the bi-quad.)
 - 
Tom Street, Fri, 24 Feb 2012 5:37PM
compact and simple.
 - 
sam Wilson, Sat, 27 Aug 2011 12:27PM