M4 (9.5x9) + Various Number of RRs

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M4 (9.5x9) + Various Number of RRs - OPT

M4 (9.5x9.0) 4-Bay Bowtie with Various Number of Reflector Rods (RR) analyzed using 4nec2.

UHF (Only) performance was Optimized using nikiml's Python Scripts to search Length,
Rod-Rod Spacing and Bowtie to Reflector Rod Separation.

As expected, 41RR provided the best overall performance, but 17RR was a close second,
with considerable savings in the cost of metal and wind resistance.

7RRs: UHF Raw Gain = 11.6 to 14.4 dBi, F/B & F/R Ratio Min = 11.9 dB and SWR (300-ohms) Under 2-6.

17RRs: UHF Raw Gain = 12.8 to 15.2 dBi, F/B & F/R Ratio Min = 17.6 dB and SWR (300-ohms) Under 2-6.

41RRs: UHF Raw Gain = 13.3 to 14.8 to 14.7 dBi, F/B & F/R Ratio Min = 21.3 dB and SWR (300-ohms) Under 2-7.

Summary of Optimized Dimensions (in inches, may round off to nearest 0.1 or 1/8-in).
Due to choosing different Min-Max YRod, there were two modes of operation - Narrow and Wide,
where the latter is showing yet another mode of operation change in vicinity of RR=17 to 15.

NARROW SOLUTION DIMENSIONS (see Comparison Charts Below):
Num. RR= 41     31       25       21       17       15       13       9        7        5        3
RS=        5.08    4.99    4.79    4.86    4.76   4.75    4.55    4.59   4.53    4.61    4.28
RR=        1.00    1.33    1.67    2.00    2.50   2.86    3.33    4.00   4.36    6.20    7.41
YRod=   18.84 17.58 17.34 15.18 14.29 13.87 13.55 13.57 13.29 12.62 13.00

WIDE SOLUTION DIMENSIONS:
Num. RR= 41     31       25       21       17       15       13       9         7        5         3
RS=        4.46    4.60    4.88    4.63    4.87   4.91    4.96    4.40    4.12    3.68    3.12
RR=        1.00    1.33    1.67    2.00    2.50   2.31    2.58    3.33    4.15    6.11    6.02
YRod=   22.69 24.64 24.77 24.90 26.54 17.03 16.24 18.13   18.20 18.20 18.08

All Rrod=0.125-in Radius, RS = Reflector-to-Bowtie Separation, RR = Rod-to-Rod
Separation, YRod = Half-Length of Reflector Rods.]

EDIT (2Jan2014): Split out YRod = Narrow and Wide solutions in summary, Charts show
Wide for RR=31-21 and Narrow for the rest and still need to be updated.

EDIT (8Jan2014): Added entries in Wide Solution Chart and (Narrow) Comparison Charts.

Date(s): 26 Nov 2013. Album by holl_ands. 1 - 17 of 17 Total. 4150 Visits.

enlarge 205KB, 1024x696 1 M4 (9.5x9) + Various Number of RRs UHF Raw Gain	enlarge 268KB, 1024x696 2 M4 (9.5x9) + Various Number of RRs UHF F/R Ratio	enlarge 191KB, 1024x696 3 M4 (9.5x9) + Various Number of RRs UHF SWR (300-ohms)
enlarge 219KB, 1024x696 4 M4 (9.5x9) + Various Number of RRs Hi-VHF Raw Gain	enlarge 255KB, 1024x696 5 M4 (9.5x9) + Various Number of RRs Hi-VHF F/R Ratio	enlarge 212KB, 1024x696 6 M4 (9.5x9) + Various Number of RRs Hi-VHF SWR (300-ohms)
enlarge 269KB, 923x1024 7 M4 (9.5x9) + 41 RRs 3D View	enlarge 313KB, 1024x879 8 M4 (9.5x9) + 41 RRs Front View [1 large square = 5 inches]	enlarge 69KB, 259x1024 9 M4 (9.5x9) + 41 RRs Top View [1 large square = 2.5 inches]
enlarge 168KB, 876x1024 10 M4 (9.5x9) + 17 RRs 3D View	enlarge 241KB, 813x1024 11 M4 (9.5x9) + 17 RRs Front View [1 large square = 2.5 inches]	enlarge 90KB, 303x1024 12 M4 (9.5x9) + 17 RRs Top View [1 large square = 2.5 inches]
enlarge 112KB, 692x1024 13 M4 (9.5x9) + 7 RRs 3D View	enlarge 310KB, 901x1024 14 M4 (9.5x9) + 7 RRs Front View [1 large square = 2.5 inches]	enlarge 102KB, 346x1024 15 M4 (9.5x9) + 7 RRs Top View [1 large square = 2.5 inches]
enlarge 36KB, 791x1024 16 M4 (9.5x9) + 17 RRs 4nec2 File	enlarge 22KB, 791x1024 17 M4 (9.5x9) + 17 RRs Contents of Python Control *.bat text File

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