CM Universal Magnetic Loop Antenna NEC model by Carol F. Milazzo, KP4MD CM Vertical orientation (using GH command) CM http://www.qsl.net/kp4md/magloop.htm CM Frequency = 7 MHz bottom feed CM Impedance 50 ohms CM 18-side polygon CM RG-8/U loop CM Simulated average ground CE SY frq=7 'frequency MHz SY c=1.42e-10 'Input resonating capacitance SY qc=2000 'Input resonating capacitor Qc SY rc=1/(2*3.1415926*frq*1e6*c)/qc 'Calculate capacitor Rc SY d=3 'Input loop diameter feet SY r=0.5*d 'Calculate loop radius SY od=0.405 'Input loop cable outer dia. inches SY rad2=0.5*od/12 'Calculate loop cable outer radius feet SY dia=0.32 'Input loop conductor dia. inches SY rad=0.5*dia/12 'Calculate loop conductor radius feet SY n=18 'Input n-polygon main loop SY h=5 'Input height to loop feet GH 1 n 1e-300 1e-300 r r r r rad GM 0 0 90 90-180/n 0 0 0 h+r 0 GS 0 0 0.3048 GE 1 LD 0 1 n/2 n/2 rc 0 c LD 5 0 0 0 4500000 LD 7 0 0 0 4.5 rad2 GN 2 0 0 0 13 0.005 EK EX 0 1 n 0 1. 0 0 FR 0 0 0 0 frq 0 EN