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 holl_ands | Home > Loop Antennas incl Folded Dipole > 
H+U 4-Bay Loop RLH4 - No Refl
Hi-VHF + UHF 4-Bay + Loop (RLH4) + No Reflector analyzed using 4nec2 after determining
Dimensions using nikiml's Python Optimization Scripts.  Two versions are presented,
the latest, best version first and the original superseded version next:

a) Hi-VHF + UHF 4-Bay (Whiskers = 9.8") with Hi-VHF Resonator Loop (22.7" H x 22.6") + No Reflector:

UHF Raw Gain = 9.4 to 12.4 dBi and SWR (300-ohms) is Under 2.7 [EXCELLENT].
Hi-VHF Raw Gain = 5.5 to 5.9 dBi and SWR (300-ohms) is Under 2.7 [EXCELLENT].

Compares favorably to FF4, Free Form 4-Bay (NO Refl.), but RLH4 has lost 1.5 to 0.3 dB UHF Gain,
in exchange for 1.6 to 2.2 higher Hi-VHF Gain and BOTH SWR's under 2.7 [EXCELLENT]:

===================================
Original version has been deleted:

b) Hi-VHF + UHF 4-Bay (Whiskers = 10.125") with Hi-VHF Resonator Loop (20.0" H x 22.625") + No Reflector:

UHF Raw Gain = 9.7 to 12.4 dBi and SWR (300-ohms) is Under 2.4 [EXCELLENT].
Hi-VHF Raw Gain = 5.0 to 5.6 dBi and SWR (300-ohms) = 2.4 to 3.4 is a Bit High on Higher Channels.
Date(s): 21 Mar 2015. Album by holl_ands. 1 - 31 of 31 Total. 7711 Visits.
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H+U 4-Bay Loop RLH4 - No Refl
3D View


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H+U 4-Bay Loop RLH4 - No Refl
Front View
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Bowtie Tips are TOUCHING, which become
4 continuous Zig-Zag Structures (like G-H)


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H+U 4-Bay Loop RLH4 - No Refl
Top View
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Loops are 0.5-in Behind Bowties


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H+U 4-Bay Loop RLH4 - No Refl
UHF Raw Gain = 9.4 to 12.4 dBi


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H+U 4-Bay Loop RLH4 - No Refl
UHF SWR (300-ohms) Under 2.7


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H+U 4-Bay Loop RLH4 - No Refl
UHF Impedance


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H+U 4-Bay Loop RLH4 - No Refl
Azimuthal Pattern at 470 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Azimuthal Pattern at 530 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Azimuthal Pattern at 590 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Azimuthal Pattern at 650 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Azimuthal Pattern at 698 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Azimuthal Pattern at 806 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Elevation Pattern at 470 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Elevation Pattern at 530 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Elevation Pattern at 590 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Elevation Pattern at 690 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Elevation Pattern at 698 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Elevation Pattern at 806 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Hi-VHF Raw Gain = 5.5 to 5.9 dBi


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H+U 4-Bay Loop RLH4 - No Refl
Hi-VHF SWR (300-ohms) Under 2.7


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H+U 4-Bay Loop RLH4 - No Refl
Hi-VHF Impedance


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H+U 4-Bay Loop RLH4 - No Refl
Azimuthal Pattern at 174 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Azimuthal Pattern at 198 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Azimuthal Pattern at 216 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Elevation Pattern at 174 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Elevation Pattern at 198 MHz


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H+U 4-Bay Loop RLH4 - No Refl
Elevation Pattern at 216 MHz


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4nec2 File contains Summary of Dimensions


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EVAL Results Text File


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EVAL Performance Summary *.html File


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H+U 4-Bay Loop RLH4 - No Refl
Side View
[1 large square = 5 inches]


 
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Enjoy reading your posts. Hard to tell how I would duplicate the loop for an existing 4-bay panel with a reflector.
 - 
Pete Higgins, Sat, 21 Mar 2015 10:26PM