Hi-VHF 4-Bay Bowtie analyzed using 4nec2, for a Uniform 4-Bay (No Reflector) with SAME Dimensions for Whisker Length, Bowtie-Bowtie Separation and Tine Separations using AWG10 wires, presuming AWG10 Wire Size.
Two versions are presented:
a) nikiml's Python OPTImization Scripts were used to find the "best" Dimensions: BowLength=30.5-in, Bowtie-Bowtie Separation=31.5-in, TineSeparation=17.5-in, Feedline Separation=1.0in and Hop Separation=1.0-in at the OFFSET Crossovers, which are 7.5-in from OUTER Bowties: Total Size = 112-in H x 59.4-in W:
Hi-VHF Raw Gain = 10.2 to 12.3 dBi and SWR (300-ohms) Under 2.2.
======================================================== b) BowLength=33-in, Bowtie-Bowtie Separation=32-in, TineSeparation=17-in, Feedline Separation=1.5-in and Hop Separation=0.5-in at the Crossovers. A very long crossover was assumed (like Kosmic SuperQuad vice Offset Crossover in CM4224). Total Size = 113-in H x 66-in W:
Hi-VHF Raw Gain = 11.0 to 12.3 to 10.8 dBi and SWR (300-ohms) Under 3.0 [HIGHER than Desired].
Performance in UHF Band was also analyzed. Yes there is Gain, but it is very inconsistent in beam direction.
ERRATA (7Jul2016): Original 2010 Gain Curve was corrected (F/B & F/R Ratios should have been Zero). Due to small differences (couple tenths of a dB), decided to rerun and upload ALL Hi-VHF Band Results.
UPDATE (9Jul2016): Added an OPTIMIZED version (First Alternative) with Acceptable SWR.
Date(s): 1 Apr 2010. Album by holl_ands. 1 - 40 of 40 Total. 12203 Visits.
