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G8JNJ 432 MHz Mixed Mode Antenna ModelCM Illustrates use of GH (helix) input CM Illustrates use of GM (move wires) input CE SY f=432 'Input Frequency MHz SY k=308.756 'Input Velocity constant ~300 Mm/s SY w=k/f 'Calculate Wavelength in space SY hw=0.5*w 'Calculate Half wavelength in space SY t=3 'Input Number of helix turns SY ts=18 'Input Segments per helix turn SY n=t*ts 'Calculate Segments total SY wl=0.5 'Input Antenna height in wavelengths SY l=wl*w 'Calculate Antenna height in meters SY s=l/t 'Calculate Turn spacing in meters SY r=sqr(hw*hw-s*s)/2/PI 'Calculate Helix radius in meters SY d=.0025 'Input Wire radius in meters SY h=2 'Input Height above ground in meters GH 1 n s l r r r r d GM 0 0 0 0 0 0 0 h 0 GE 1 LD 5 0 0 0 58000000 'copper GN 1 EK EX 0 1 n/2 0 1. 0 0 FR 0 0 0 0 f 0 EN REFERENCES
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