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## Re: [Antennaware] Moxon rectangles

 To: antennaware@contesting.com Re: [Antennaware] Moxon rectangles 4nec2@gmx.net Tue, 29 Mar 2005 16:07:10 +0200 (MEST)
 ```Hello Mauri and others, > rather than looking for anything else, I'd like to point out my doubts > about ability of standard antenna modeling software to give correct > results in case of sharp wire angles. > Moreover, my experience with modeling of moxon rectangles (AO6) has > been quite disappointing with F/B, to the point I never thought to > build any. For those who would like to play a bit: From the equations used by MoxGen (AC6LA) and as described in L.B. Cebiks page (www.cebik.com/moxon/moxgen.html) I created a 40 meter 4nec2 model containing similar equations. See below, 19 dB F/B. Just change the 'Fr=7.1' value to create/calculate a model for a different frequency. All this without saying something about the reliability of the model, because I have no means of comparing things with practical results. Arie Voors. ****************** CM Moxon rectangle by equation as descibed by CM L.B. Cebik in www.cebik.com/moxon/moxgen.html CM Comparison with model created using MoxGen CM (www.qsl.net/ac6la/) yields equal results. CE SY Fr=7.1 ' Specify frequency SY WD=1 ' Specify wire diameter ' 'SY WLI =11802.71/Fr, DW=WD/WLI ' If wire diameter in inches SY WLI =299792.5/Fr, DW=WD/WLI ' If wire diameter in millimeters 'SY DW=WD ' If wire diameter in wavelengths ' SY Wl=299.7925/Fr ' Wavelength SY D1=.4342945*LOG(DW) SY AA=-.0008571428571, AB=-.009571428571, AC=.3398571429 SY A=(AA*(D1^2))+(AB*D1)+AC SY BA=-.002142857143, BB=-.02035714286, BC=.008285714286 SY B=(BA*(D1^2))+(BB*D1)+BC SY CA=.001809523381, CB=.01780952381, CC=.05164285714 SY C=(CA*(D1^2))+(CB*D1)+CC SY DA=.001, DB=.07178571429 SY D=(DA*D1)+DB SY A=A*Wl, B=B*Wl, C=C*Wl, D=D*Wl ' Dimensions in meters SY rad=DW*WL/2 ' Wire radius in mtr. ' SY hgh=20 ' Height above ground ' GW 1 35 C/2+B -A/2 hgh C/2+B A/2 hgh rad GW 2 5 C/2 -A/2 hgh C/2+B -A/2 hgh rad GW 3 5 C/2+B A/2 hgh C/2 A/2 hgh rad GW 4 35 -C/2-D -A/2 hgh -C/2-D A/2 hgh rad GW 5 7 -C/2 -A/2 hgh -C/2-D -A/2 hgh rad GW 6 7 -C/2-D A/2 hgh -C/2 A/2 hgh rad GE FR 0 1 0 0 Fr 0 GN 2 0 0 0 13 .005 ' Use average ground EX 0 1 18 1 0 EN ****************** -- (Please ignore the advertisements below.) Handyrechnung zu hoch? Tipp: SMS und MMS mit GMX Seien Sie so frei: Alle Infos unter http://www.gmx.net/de/go/freesms _______________________________________________ Antennaware mailing list Antennaware@contesting.com http://lists.contesting.com/mailman/listinfo/antennaware ```
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