UHF M2 2-Bay Bowtie - NO Reflector

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UHF M2 2-Bay Bowtie - NO Reflector

UHF M2 (10.0x9.5) 2-Bay Bowtie with No Reflector analyzed using 4nec2. Dimensions for mclapp's M2 are half of an M4.
Height=14-inches, Width=20-inches.

UHF Raw Gain = 5.7 to 9.7 dBi and SWR (300-ohms) under 3.2 [FAIR].
Hi-VHF Raw Gain = 2.2 to 2.5 dBi and SWR (300-ohms) = 13 to 7 [EXCESSIVE].

Quasi-Optimum sizes for ALL AWG10 wire sizes:
BowLength=10.0", BowSpacing=9.5", TineSpacing=5.0",
FeedlineSeparation =1.5" and ALL AWG10 wire size.

Good UHF Band Gain, although SWR increases at higher frequencies.
Hi-VHF Gain about same as a Dipole, but SWR is Excessive.

BTW: M2 (9.5x9.0) Raw Gain Curve was NOT well matched to the NEW UHF Band, extending well beyond
Ch51 (698 MHz) and hence less Gain was available on the lower Channels, see charts at the bottom.

Date(s): 20 Apr 2010. Album by holl_ands. 1 - 24 of 24 Total. 10145 Visits.

enlarge 201KB, 1024x756 1 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector Front View [1 small box = 0.5-inch]	enlarge 45KB, 185x1024 2 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector Top View [1 small box = 0.5-inch]	enlarge 28KB, 791x1024 3 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector 4nec2 File
enlarge 139KB, 1024x648 4 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector UHF Raw Gain = 5.7 to 9.7 dBi	enlarge 141KB, 1024x648 5 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector UHF SWR (300-ohm) Under 3.2	enlarge 149KB, 1024x648 6 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector UHF Impedance
enlarge 317KB, 1024x1024 7 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector UHF Pattern at 470 MHz	enlarge 321KB, 1024x1024 8 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector UHF Pattern at 602 MHz	enlarge 319KB, 1024x1024 9 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector UHF Pattern at 698 MHz
enlarge 133KB, 1024x648 10 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector Hi-VHF Raw Gain = 2.2 to 2.5 dBi	enlarge 154KB, 1024x648 11 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector Hi-VHF SWR (300-ohm) = 13 to 7 is Excessive.	enlarge 130KB, 1024x648 12 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector Hi-VHF Impedance
enlarge 324KB, 1024x1024 13 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector Hi-VHF Pattern at 174 MHz	enlarge 325KB, 1024x1024 14 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector Hi-VHF Pattern at 198 MHz	enlarge 328KB, 1024x1024 15 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector Hi-VHF Pattern at 216 MHz
enlarge 143KB, 1024x648 16 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector UHF Raw Gain at 470 MHz vs Feedline Separation	enlarge 143KB, 1024x648 17 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector UHF Raw Gain at 602 MHz vs Feedline Separation	enlarge 146KB, 1024x648 18 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector UHF Raw Gain at 698 MHz vs Feedline Separation
enlarge 158KB, 1024x648 19 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector UHF SWR_300 at 470 MHz vs Feedline Separation	enlarge 191KB, 1024x648 20 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector UHF SWR_300 at 602 MHz vs Feedline Separation	enlarge 171KB, 1024x648 21 UHF 2-Bay Bowtie (10.0x9.5) - NO Reflector UHF SWR_300 at 698 MHz vs Feedline Separation
enlarge 139KB, 1024x648 22 UHF 2-Bay Bowtie (9.5x9.0) - NO Reflector UHF Raw Gain = 5.3 to 9.6 dBi	enlarge 140KB, 1024x648 23 UHF 2-Bay Bowtie (9.5x9.0) - NO Reflector UHF SWR (300-ohms) Under 2.9	enlarge 140KB, 1024x648 24 UHF 2-Bay Bowtie (9.5x9.0) - NO Reflector UHF Impedance

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I originally built this as half of an M4 design. Great for local stuff in Montreal. It is hanging in my ground floor living room window facing <> east, no reflector. Global(Ch46) is not very clear though.
Keep up the good work. Each new design gets me thinking about what will fit atop my 25' tower. I am leaning towards a M4 bow-tie rather than a gray-hoverman for the U.S. stuff.
regards
decbdklogan
- decbdklogan, Tue, 29 Mar 2011 5:50PM

Awesome work! Very helpful data Holl_ands. Very much appreciated!
- IDRick, Fri, 23 Apr 2010 2:48PM