CM Based on "An Unorthodox Antenna." in QST in March 1936 by H. J. Seigel (W3EDP), a modified Zepp antenna CM Modified to use a vertical dual feeder instead of the tuned circuit CM Model created by Roger Walker, GW6HRU CM CM UK Bandplan reminder:CM UK Bandplan reminder: CM 1.800 1.850 1.825 164.27 CQWW CM 3.500 3.800 3.650 82.13 * CQWW CM 5.2585 5.4065 5.333 56.22 CM 7.000 7.200 7.100 42.22 * CQWW CM 10.100 10.150 10.125 29.61 CM 14.000 14.350 14.175 21.15 * CQWW CM 18.068 18.168 18.118 16.55 CM 21.000 21.450 21.225 14.12 * CQWW CM 24.890 24.990 24.940 12.02 CM 28.000 29.700 28.850 10.39 * CQWW CM 50.000 52.000 51.000 5.88 CM CM Feed impedence is about 200ohm, so expects a 4:1 balun CE SY F=1.45 'Original has F=1, gives 2.65m V, 10.55m H, but F=1.45 4.83m vert (dual), 15.3m horizontal (single) for better 40m SY Q=299.792458/(7.1*4) ' Quarter wave length SY R=4 'Ratio of H to V SY H=6 'Height above ground SY S=Q*F 'Horizontal single fed section SY D=S/R 'Vertical dual fed section SY W=0.001 'Wire radius, 2mm wire SY G=0.02 'Gap between dual fed section (1cm for 300ohm, 2cm for 450ohm) SY B=G*13 'We split the vertical dual into 3 so that we can reduce the number of segments SY M=B*5 'We split the vertical dual into 3 so that we can reduce the number of segments GW 1 1 -G/2 0 H-D G/2 0 H-D W 'Feed point - 200ohm, so 1:4 balun GW 10 3 -G/2 0 H-D -G/2 0 (H-D)+B W 'Bottom Left of dual GW 11 3 -G/2 0 (H-D)+B -G/2 0 (H-D)+M W 'Mid Left of dual GW 12 13 -G/2 0 (H-D)+M -G/2 0 H W 'Top Left of dual GW 20 3 G/2 0 H-D G/2 0 (H-D)+B W 'Bottom Right of dual GW 21 3 G/2 0 (H-D)+B G/2 0 (H-D)+M W 'Mid Left of dual GW 22 13 G/2 0 (H-D)+M G/2 0 H W 'Top Right of dual GW 23 40 G/2 0 H S-(G/2) 0 H W 'Upper far wire GE 1 'Ground model, 1=Real Ground LD 5 0 0 0 58000000 GN 2 0 0 0 4 0.003 '2=Moderate, 4=dielectric constant, 0.003=Conductivity EK EX 0 1 1 0 1 0 0 'Load 0=Voltage source, feeding tag 99, segment 1 FR 0 0 0 0 7.100 0 'Default frequency EN