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holl_ands | Home > Multi-Bay Bowtie Antennas > UHF 4-Bay Bowties with Reflector > Browse:Ch22 FF4 4-Bay Bowtie + DARNEW UHF Free-Form 4-Bay + FlatScreenReflUHF Free-Form 4-Bay + DblAnglReflUHF FF4 SingleAngleRefl - DeepSidelobesUHF M4 (10x9.5) Super-4-Bay+DARUHF M4 (9.5x9.0)+DAR Flat vs Swept BowsM4 (9.5x9.0)+DAR Flat v Swept BowsM4 (9.5x9) + Various FLAT Refl. WidthsM4 (9.5x9.0) + 40x34 FLAT Refl at 5-inUHF M4 (9.5x9.0) 4-Bay+FLAT Grid at 5.5"UHF M4 (9.5x9.0) 4-Bay+FLAT Grid at 16"M4 (9.5x9) + Various Number of RRs - OPTUHF KosmicSuperQuad+DAR FlatvsSwept BowsUHF Actual CM4221 Flat Bows & ReflectorUHF CM4221a.ez.nec Flat Bows & ReflectorUHF CM4221HD (Hacked) - 16 ReflRodsUHF CM-4221HD - 10-in WhiskersUHF CM4221HD (Hacked) + Director RodsCM4221HD (Hacked) + Stub FilterAntennacraft U-4000 - 9 Reflector RodsA-D Old DB-4 4-Bay Bowtie with Reflector
M4 (9.5x9) + Various FLAT Refl. Widths M4(9.5x9) Various Flat (40-in H, 2"x4" Grid) Screen Reflector Widths and Reflector-Bowtie Separations were analyzed using 4nec2 and Parametric Variation of these two Variables. UHF Gain continues to increase as the Reflector Width Increases, HOWEVER, BEST Hi-VHF Gain and F/R Ratio Performance requires 32-in Reflector Width.  At small Widths, Hi-VHF Gain will be either more or less SAME toward Front and Rear.....or HIGHER towards the REAR on Lower Channels.  Increasing HEIGHT of the Reflector continues to improve UHF Gain, but fairly slowly after it extends beyond the Bowtie by a couple inches. UHF Performance continues to increase as the Reflector Width increses, HOWEVER, BEST Hi-VHF Gain and F/B Ratio Performance requires a 32-in Reflector Width.  At small Widths, Hi-VHF Gain will be either more or less SAME toward Front and Rear.....or HIGHER towards the REAR on Lower Channels. Date(s): 27 Nov 2013. Album by holl_ands. 1 - 12 of 12 Total. 4349 Visits.
enlarge 158KB, 1024x696 1 M4 (9.5x9.0) + FLAT 40x34 Refl UHF Raw Gain for Refl-Bowtie Separations enlarge 173KB, 1024x696 2 M4 (9.5x9.0) + FLAT 40x34 Refl UHF F/R Ratio for Refl-Bowtie Separations enlarge 179KB, 1024x696 3 M4 (9.5x9.0) + FLAT 40x34 Refl UHF SWR for Refl-Bowtie Separations enlarge 173KB, 1024x696 4 M4 (9.5x9.0) + FLAT 40x34 Refl Hi-VHF Raw Gain for Refl-Bowtie Separations enlarge 192KB, 1024x696 5 M4 (9.5x9.0) + FLAT 40x34 Refl Hi-VHF F/R Ratio for Refl-Bowtie Separations enlarge 237KB, 1024x696 6 M4 (9.5x9.0) + FLAT 40x34 Refl Hi-VHF SWR for Refl-Bowtie Separations enlarge 226KB, 1024x696 7 M4 + Various FLAT Reflector Sizes For Grid-to-Bowtie Separation = 5.5-in UHF Raw Gain Comparisons enlarge 258KB, 1024x696 8 M4 + Various FLAT Reflector Sizes For Grid-to-Bowtie Separation = 5.5-in UHF F/R Ratio Comparisons enlarge 196KB, 1024x695 9 M4 + Various FLAT Reflector Sizes For Grid-to-Bowtie Separation = 5.5-in UHF SWR Comparisons enlarge 213KB, 1024x696 10 M4 + Various FLAT Reflector Sizes For Grid-to-Bowtie Separation = 5.5-in Hi-VHF Raw Gain Comparisons enlarge 284KB, 1024x696 11 M4 + Various FLAT Reflector Sizes For Grid-to-Bowtie Separation = 5.5-in Hi-VHF F/R Ratio Comparisons enlarge 248KB, 1024x696 12 M4 + Various FLAT Reflector Sizes For Grid-to-Bowtie Separation = 5.5-in Hi-VHF SWR Comparisons
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