I'm trying to model a Hygain 105CA that I just bought using NEC-2.
I've used the dimensions for the "Low Phone" setting (also on the hygain web
site). But when I run it through NEC-2 the max gain and impedance values
look to be about 0.5 MHz low.
I did not enter the tapered tubing sizes, but instead used one diameter
for all elements. I thought I would be able to get the data coming out of NEC
to match the published curves by playing with the diameter of the tubing.
The cloest I can get is with a very small tubing size, but it is still too low.
Is this a valid way to do the taper correction? Is this the problem? I didn't
enter all of the tubing diamaters because I thought there was a problem
with NEC-2 and multi-diamater conductors.....is this true?
Any ideas? The NEC input file is below, and a summary of the output.
73
--Lee - KT4ZX
CM 105CA test
CE
GW 1 13 -9 0 72 9 0 72 .005
GW 2 13 -8.51 4.833 72 8.51 4.833 72 .005
GW 3 13 -8.438 8.583 72 8.438 8.583 72 .005
GW 4 13 -8.292 15.542 72 8.292 15.542 72 .005
GW 5 13 -7.979 23.875 72 7.979 23.875 72 .005
GS 0 0 .3048
GE 1
GN -1 0 0 0 13 .005 0 0 0 0
EX 0 2 7 0 1 0
FR 0 30 0 0 27.3 0.05
RP 0 31 36 1000 60 0 1 10
EN
#FREQ MX_GAIN SWR REAL IMAG MX_AZ MX_EL MN_GAIN MN_AZ
MN_EL
27.500 10.08 2.58 28.48 -30.16 90.0 1.0 -157.72 0.0
0.0
27.550 10.12 2.53 27.75 -28.13 90.0 0.0 -157.09 0.0
0.0
27.600 10.15 2.49 27.01 -26.05 90.0 1.0 -156.47 0.0
0.0
27.650 10.18 2.46 26.27 -23.93 90.0 0.0 -155.86 0.0
0.0
27.700 10.20 2.43 25.50 -21.77 90.0 1.0 -155.28 0.0
0.0
27.750 10.22 2.41 24.75 -19.58 90.0 2.0 -154.71 0.0
0.0
27.800 10.24 2.40 24.05 -17.43 90.0 1.0 -154.16 0.0
0.0
27.850 10.25 2.40 23.28 -15.31 90.0 1.0 -153.63 0.0
0.0
27.900 10.25 2.42 22.46 -13.18 90.0 0.0 -153.14 0.0
0.0
27.950 10.23 2.46 21.56 -11.17 90.0 1.0 -152.68 0.0
0.0
28.000 10.20 2.54 20.49 -9.21 90.0 2.0 -152.26 0.0
0.0
28.050 10.16 2.68 19.13 -7.27 90.0 1.0 -151.91 0.0
0.0
28.100 10.08 2.91 17.42 -5.30 90.0 1.0 -151.60 0.0
0.0
28.150 9.97 3.28 15.30 -3.02 90.0 1.0 -151.39 0.0
0.0
28.200 9.81 3.89 12.84 -0.28 90.0 0.0 -151.27 0.0
0.0
28.250 9.54 4.88 10.30 3.15 90.0 1.0 -151.27 0.0
0.0
28.300 9.12 6.45 7.91 7.20 90.0 1.0 -151.40 0.0
0.0
28.350 8.43 8.88 5.95 11.84 90.0 1.0 -151.62 0.0
0.0
28.400 7.31 12.17 4.57 16.74 90.0 1.0 -151.77 0.0
0.0
28.450 5.53 16.01 3.72 21.73 90.0 1.0 -151.56 0.0
0.0
28.500 4.19 19.47 3.30 26.63 270.0 3.0 -150.89 0.0
0.0
--
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