Extended Boom on YA-1713 as per SemiChemE experiment adding six 24.125-in directors with 14-in spacing. Spacing was determined by a recycled FM antenna with antenna elements shortened....so NOT optimized. Also ran 4nec2 simulation runs with only three additional directors.
Gain increase was moderate across Ch7-11. Due to modeling shortcomings identified in other NEC runs, Ch12-13 results are indeterminate. The severe gain roll-off was NOT found in either the On-Air I conducted or in the fol. On-Air test: http://www.aa6g.org/Lp/tests.html
Date(s): 23Feb2010. Album by holl_ands. 1 - 4 of 4 Total. 2163 Visits.
enlarge 112KB, 1024x696 1 Compare Raw Gain Original YA-1713 versus adding 3 or 6 Directors
enlarge 114KB, 1024x696 2 Compare Net Gain Original YA-1713 versus adding 3 or 6 Directors
enlarge 128KB, 1024x695 3 Compare F/R Ratio Original YA-1713 versus adding 3 or 6 Directors
