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[antennaware] NEC-2 help with Hygain 105CA model

To: <antennaware@contesting.com>
Subject: [antennaware] NEC-2 help with Hygain 105CA model
From: leewells@lexmark.com (leewells@lexmark.com)
Date: Wed, 30 Sep 1998 11:26:44 -0400
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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