NEC2 plot of apt1g.sum






   MHz	  ohms		 mw	 SWR


135.000	54.2+20.3i	8.093	1:1.49


135.500	20.3+9.8i	19.980	1:2.58


136.000	54.6+21.6i	7.917	1:1.52


136.500	65.9+5.4i	7.535	1:1.34


137.000	52.8-34.1i	6.685	1:1.92


137.500	74.3-1.6i	6.724	1:1.49


138.000	58.5+16.7i	7.899	1:1.41


138.500	34.7-29.9i	8.265	1:2.19


139.000	56.5-29.7i	6.937	1:1.76


139.500	47.2-36.0i	6.694	1:2.07


137.300	68.7+4.8i	7.239	1:1.39


137.320	57.0+18.2i	7.952	1:1.44


137.340	70.9-6.7i	6.991	1:1.44


137.360	64.4+9.4i	7.598	1:1.35


137.380	54.7+19.5i	8.116	1:1.46


137.400	49.4-35.2i	6.710	1:2.00


137.420	60.0-25.0i	7.101	1:1.63


137.440	44.3-33.9i	7.109	1:2.04


137.460	54.1-32.5i	6.792	1:1.86


137.480	64.7-24.0i	6.793	1:1.63


137.500	74.3-1.6i	6.724	1:1.49


137.520	57.1+15.0i	8.194	1:1.36


137.540	66.5-15.7i	7.119	1:1.48


137.560	69.8+7.4i	7.081	1:1.43


137.580	59.1+14.4i	7.985	1:1.37


137.600	46.3-33.3i	7.120	1:1.98


137.620	68.7-22.4i	6.575	1:1.64


137.640	41.1-33.5i	7.304	1:2.11


137.660	60.2-32.5i	6.433	1:1.84


137.680	68.9-22.7i	6.546	1:1.65


137.700	68.5-7.3i	7.220	1:1.40




  MHz	dBi	dBd	 F/B	ohms
137.500	2.96	0.82	0.03	74.3-1.6i


3.050.91




CM
CM            APT Quatrifial Helical Antenna
CM	 (Adapted from design by Steve Blackmore)
CM
CM		     Assuming R0=50
CM
CE345678-1-2345678-2-2345678-3-2345678-4-2345678-5-2345678-6-2345678-7-2345678-8
GH  1   40    3.6     0.9        0.1       0.1       0.1      0.1       .01
GM  1    1    0       0          180       0         0        0         1
GW  4   15    0.1     0.0        0.0       -.1       0.0      0.0       .01
GW  5   15    0.      0.1        0.9       0.        -.1      0.9       .01
GM  0    0    0       0          90        0         0        0.05      0
GH  6   40    4       1.         0.1       0.1       0.1      0.1       .01
GM  1    1    0       0          180       0         0        0         6
GW  8   15    0.1     0          0.        -.1       0.       0.        .01
GW  9   15    0       0.1        1.        0.        -.1      1.0       .01
GE
EX  0    4    8       0          1.       0.
TL  4    8    8    8  80         1.09
FR  0   10    0       0          135.0    .5
XQ
FR  0   21    0       0          137.3    .02
XQ
FR  0    1    0       0          137.5    0
RP  0    1   73  111        90         0        90         5
RP  0   73    1  111        90         0        -5        90
EN