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H+U 2-Bay+Loop RLH2 (12x10) - NO Refl
Hi-VHF+UHF 2-Bay + Rectangular Loop, RLH2 (12x10) with NO Reflector analyzed using 4nec2 after determining
Dimensions using nikiml's Python Optimization Scripts.  Rectangular Loop Resonator improves Hi-VHF Gain and SWR.
Loop Diameter of 3/4-in was assumed for this initial Optimization, but is NOT critical.
SWR in Hi-VHF Band remains under 2.7 for 1/4-in O.D. (or larger) and climbs to only 2.9 with AWG10.
And at 698 MHz, SWR climbs from 2.7 to 2.8 if only 1/4-in O.D. and 2.9 if use as small as AWG10.

RLH2 (12.0x10.0): Re-Optimized 2-Bay plus Rectangular Loop, with 0.5-in Offset (Forward) to avoid wire collisions.
Nikiml's Python Optimization Scripts determined that a 2-Bay (12.0x10.0) provides the BEST overall performance
with significantly higher UHF Raw Gain than the two alternates above and lowest SWR in both UHF and Hi-VHF Bands.

UHF Raw Gain = 8.0-8.9-7.8-8.5-8.0 dBi or 8.3 dBi +/- 0.5 dB [INCREASE of 2.3 dB on low freqs & DECREASE
of 1.2 dB on high freqs, providing a MUCH Flatter Frequency Response] and SWR (300-ohms) under 3.1 (FAIR).
Hi-VHF Raw Gain = 3.9 to 4.3 dBi [INCREASE of 1.9 to 1.8 dB] and SWR (300-ohms) under 2.3 [EXCELLENT].

OPTIMIZED DIMENSIONS (ALL AWG10 Elements, except 3/4-in O.D. Loop):
BowLength = 12.0-in = Whisker Length
BowSpacing = 10.0-in = Bowtie-to-Bowtie Separation
TineSep = 6.25-in = Tip-to-Tip Tine Separation
FeedSep = 4.5-in = Feedline Separation
Rectangular Loop = 26.75-in H x 21.0-in W
Offset = 0.5-in = Offset Separation between Bowties & Loop
Date(s): 12 Feb 2015. Album by holl_ands. 1 - 19 of 19 Total. 4779 Visits.
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Enlarge photo 1
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RLH2-Bay (12.0x10.0) + Rectangular Loop
Front View
3D View


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2
RLH2-Bay (12.0x10.0) + Rectangular Loop
Front View - 0.5-in Between 2-Bay & Loop
Loop is about 26.75-in H x 21.0-in W
Feedline Separation is about 4.5-in
Tine Separation is about 6.25-in
[1 large square = 2.5 inches]


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3
RLH2-Bay (12.0x10.0) + Rectangular Loop
Top View - 0.5-in Between 2-Bay & Loop
[1 large square = 2.5 inches]


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4
RLH2-Bay (12.0x10.0) + Rectangular Loop
UHF Raw Gain = 8.0-8.8-7.8-8.4-7.9 dBi
or 8.3 dBi +/- 0.5 dB


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5
RLH2-Bay (12.0x10.0) + Rectangular Loop
UHF SWR (300-ohms) Under 3.1


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6
RLH2-Bay (12.0x10.0) + Rectangular Loop
UHF Impedance


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7
RLH2-Bay (12.0x10.0) + Rectangular Loop
Azimuthal Pattern at 470 MHz


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8
RLH2-Bay (12.0x10.0) + Rectangular Loop
Azimuthal Pattern at 530 MHz


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9
RLH2-Bay (12.0x10.0) + Rectangular Loop
Azimuthal Pattern at 590 MHz


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10
RLH2-Bay (12.0x10.0) + Rectangular Loop
Azimuthal Pattern at 650 MHz


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11
RLH2-Bay (12.0x10.0) + Rectangular Loop
Azimuthal Pattern at 698 MHz


Enlarge Microsoft Word Document 12
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DOC12
RLH2-Bay (12.0x10.0) + Rectangular Loop
4nec2 File Includes Dimensions


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13
RLH2-Bay (12.0x10.0) + Rectangular Loop
Hi-VHF Raw Gain = 3.9 to 4.3 dBi


Enlarge photo 14
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14
RLH2-Bay (12.0x10.0) + Rectangular Loop
Hi-VHF SWR (300-ohms) Under 2.3
is MOST EXCELLENT Improvement


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15
RLH2-Bay (12.0x10.0) + Rectangular Loop
Hi-VHF Impedance


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16
RLH2-Bay (12.0x10.0) + Rectangular Loop
Azimuthal Pattern at 174 MHz


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17
RLH2-Bay (12.0x10.0) + Rectangular Loop
Azimuthal Pattern at 198 MHz


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18
RLH2-Bay (12.0x10.0) + Rectangular Loop
Azimuthal Pattern at 216 MHz


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19
M2 vs H2 vs RLH2 Comparison - No Refl
Raw Gain
H2 is Significant Improvement vs mclapp M2
RLH2's Hi-VHF Resonator Loop provides acceptable
Hi-VHF SWR at expense of lower Gain on Upper Channels


 
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