CM Universal Magnetic Loop Antenna NEC model by Carol F. Milazzo, KP4MD CM Horizontal orientation (using GH command) CM http://www.qsl.net/kp4md/magloop.htm CM Frequency = 7.050 MHz CM Impedance 50 ohms CM Both main loop and coupling loop are 18-side polygons CM RG-8/U main loop CM RG-58/U coupling loop CM Simulated good ground CE SY frq=7.05 'frequency MHz SY c=5.36e-11 'Input resonating capacitance SY qc=2000 'Input resonating capacitor Q SY rc=1/(2*3.1415926*frq*1e6*c)/qc 'Calculate capacitor Rc SY d=6.5 'Input main loop diameter feet SY r=0.5*d 'Calculate main loop radius SY dia=0.32 'Input main loop wire dia. inches SY rad=0.5*dia/12 'Calculate main loop wire radius feet SY od=0.405 'Input main loop wire outer diameter inches SY orad=0.5*od/12 'Calculate main loop wire outer radius feet SY n=18 'Input n-polygon main loop SY d2=1.61014 'Input coupling loop diameter feet SY r2=0.5*d2 'Calculate coupling loop radius SY dia2=0.135 'Input coupling loop wire dia. inches SY rad2=0.5*dia2/12 'Calculate coupling loop wire radius feet SY od2=0.195 'Input coupling loop wire outer dia. inches SY orad2=0.5*dia2/12 'Calculate coupling loop wire outer radius feet SY n2=18 'Input n-polygon coupling loop SY h=12.00448 'Input height to loop SY h2=0.140055 'Input separation from coupling loop feed point to top of main loop SY ht3=r-r2-h2 'Calculate offset from main loop center to coupling loop center GH 1 n 1e-300 1e-300 r r r r rad GH 2 n2 1e-300 1e-300 r2 r2 r2 r2 rad2 GM 0 0 0 0 180/n2-180/n 0 0 0 2 GM 0 0 0 0 180/n 0 0 h 0 GM 0 0 0 0 0 -ht3 0 0 2 GM 0 0 0 0 -90 GS 0 0 0.3048 GE 1 LD 0 1 n n rc 0 c LD 5 0 0 0 4500000 LD 7 1 0 0 4.5 orad LD 7 2 0 0 4.5 orad2 GN 2 0 0 0 4 0.01 EK EX 0 2 n2 0 1. 0 0 FR 0 0 0 0 frq 0 EN